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Used round pipe to square pipe machines, solutions of thick-walled pipe forming(1)

Used round pipe to square pipe machines, solutions of thick-walled pipe forming(1)

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  • Release time:2021-10-19 12:00
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【概要描述】In the welded pipe industry, people generally regard welded pipes with a ratio of wall thickness to outside diameter of 12%≤t/D≤18% as thick-walled pipes. Regarding the forming difficulties of thick-walled pipes with used round pipe to square pipe machines, they clearly propose Solutions such as the edge double-semi-warp forming hole shape.

Used round pipe to square pipe machines, solutions of thick-walled pipe forming(1)

【概要描述】In the welded pipe industry, people generally regard welded pipes with a ratio of wall thickness to outside diameter of 12%≤t/D≤18% as thick-walled pipes. Regarding the forming difficulties of thick-walled pipes with used round pipe to square pipe machines, they clearly propose Solutions such as the edge double-semi-warp forming hole shape.

  • Sort:Information
  • Auth:
  • Source:
  • Release time:2021-10-19 12:00
  • Pvs:
Detail

In the welded pipe industry, people generally regard welded pipes with a ratio of wall thickness to outside diameter of 12%≤ t/D≤ 18% as thick-walled pipes. Regarding the forming difficulties of thick-walled pipes with used round pipe to square pipe machines, they clearly propose Solutions such as the edge double-semi-warp forming hole shape.

 

Used round pipe to square pipe machines

 

Difficulties in processing technology of thick-walled pipe deformation:

There are three processing technology problems for thick-walled welded pipe forming with the used round pipe to square pipe machines: 1、The large bending springback, 2、Is the actual deformation blind zone is wide, 3、The large difference between the inner and outer circumferences.

 

Bending resilience is large:

the tube blank will produce two kinds of deformation, elastic deformation and plastic deformation, in the process of bending the tube blank from a straight condition into a cylindrical shape. In addition, it is inevitable to produce springback, the key is how much. Thick-walled pipes have large deformation resistance and much springback, resulting in insufficient pipe blank deformation.

 

Affected by the mechanical properties of the tube blank, the wall-to-diameter ratio (t/D), the main parameters of the pass, the characteristics of the machine and equipment, the actual operation error, etc., the springback regularity is very different, so it is difficult to accurately predict and analyze the springback amount. Give precise springback compensation. At this stage, there are roughly two commonly used methods for characterizing springback:

  • Actual measurement characterizatio: According to the evaluation of the chord length difference △b before and after springback at the same point on the edge of the deformed tube blank and the two index values of the semi-longitude difference △R before and after springback at the bending position, it is characterized by referring to the formula to calculate the following: specific accurate measurement of the characterization value is more intuitive , The most widely used.

 

Used round pipe to square pipe machines

 

  • Function representation. According to the basic theory of bending neutralization layer and the basic theory of metal elastoplastic deformation, the correlation between the deformation of the deformed tube before and after springback can be calculated. Refer to the formula to calculate the following:

 

Used round pipe to square pipe machines

 

The theoretical significance of the second calculation formula is that according to the deformation half-warp of the tube blank after springback, the yield strength of the tube blank, the thickness of the tube blank, the springback angle and the metal modulus, the required pass bending deformation radius R can be directly calculated. In turn, the adverse effects of springback on the formed tube are eliminated.

 

Deformation blind zone width

Deformation dead zone, also known as deformation dead zone, means that in the process of tube blank deformation, no matter how it deforms, there is no way to deform at the edge of the tube blank and the area whose width is equal to the thickness of the tube blank. In fact, a part of the road sections adjacent to the deformation blind zone of the basic theory also belong to the range of the deformation blind zone. The existence of the deformation blind zone has its inevitable trend.

 

  • There is an inevitable trend of deformation blind zone. The bending and deformation of the edge of the tube blank can be analyzed and studied with reference to the basic theory of bending stiffness. When a billet with a thickness of t has to bend and deform a billet with a length of L under the action of the forming and rolling force P, the positioning point of the section of the billet will definitely cause a vertical displacement y, that is, the billet will bend and deform. Calculate the bending deformation radius of the tube blank. When forming a thick-walled pipe of Φ60mm X 6mm, the calculation results show that in order to produce a bending deformation of only 0.001cm in the width of the thickness area (0.6cm), a forming force of 48kN is required. This is for welded pipe forming equipment. It is impossible to provide; what's more, according to the welding pipe forming process, the closer to the edge of the tube blank, the smaller the specific forming force acting on the tube blank, which in turn causes the specific deformation blind zone to be wider.

 

In addition, from the perspective of the specific deformation effect, a bending deformation of 0.001 cm should be completed in a length of 0.6 cm, and the bending radius R is equal to 30 cm. The arc length of 0.6 cm is the same as a straight line on an arc with a half meridian of 30 cm.

 

  • Comparison of deformation blind zone. Both thick-walled pipes and thin-walled pipes have deformation blind zones; only thick-walled pipes' deformation blind zones account for a higher proportion of the total width of the tube blank. Taking Φ60mm X 3mm and Φ60mm X 6mm as examples, their blind zone width ratios of 2t /B (%) are 3.24% and 6.89%, respectively, and the latter is twice that of the previous one. Therefore, according to the calculation formula of the total opening width of the deformation blind zone, the total width of the trench on both sides of the wall thickness can be obtained as 0.64mm (tube inner diameter r2=27.87mm) and 2.79mm (tube inner diameter r2=25.08mm), the latter being 4.36 times of the former, the influence of such a wide groove on the thick-walled pipe of the used round pipe to square pipe machines on the weld strength is obvious.

 

Large difference in diameter between inside and outside

Still taking the Φ60mm X 6mm thick-walled pipe as an example, the difference between the inner and outer circumferences is 37.68mm, while the difference between the inner and outer circumferences of the Φ60mm X 3mm standard wall thickness pipe is only 18.84mm. A pipe with a large circumference difference represents a large amount of internal axial stress accumulated in the formed tube. The process of compressing the inner layer and stretching the outer layer requires a lot of deformation work, and its increased deformation resistance has an impact on the unit. Both the drag output power and the rigidity of the unit have special requirements. After welding, the large amount of compressive stress accumulated on the inner side of the neutral layer of the pipeline always tries to open the weld; in addition, the large amount of tensile stress accumulated on the outer side of the neutral layer is always pulling the weld, trying to get rid of the weld. In addition, the actual effects of these two stresses on the welding seam are the same, with superimposing effects. These accumulated stresses in thick-wall welded pipes cause serious stress corrosion damage to the weld seam, and have great potential safety hazards, which must be solved by the welded pipe forming process.

 

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In-depth Interpretation of Market Status
The current Used pipe welding machine market shows a "tripartite" pattern:

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Among these, the three core competitive strengths of the Japanese 25 model Used pipe welding machine:

Precision retention: Maintains ±0.05mm machining accuracy even after 5 years of use

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Residual value rate: Retains over 40% residual value after 3 years of use

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High-precision forming system (7 horizontal rolls + 5 vertical rolls configuration)

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Procurement Decision Guide
Five critical dimensions to consider when purchasing Used pipe welding machines:

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Technical documentation completeness (must include complete maintenance records)

Supplier qualifications (prefer authorized service providers of Japanese brands)

Local service capabilities (service network with 2-hour response time)

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Second-hand equipment: Approximately ¥1.2 million

Annual cost savings: ¥760,000 (including energy, maintenance, etc.)

Payback period: 19 months

Future Development Trends
Intelligent retrofitting will become the value growth point for Used pipe welding machines:

Adding IoT modules for remote monitoring (increases value by 15%)

Upgrading automatic mold-changing systems (improves efficiency by 20%)

Retrofitting intelligent sorting devices (reduces labor costs by 30%)

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The Japanese 25 model Used pipe welding machine is redefining industry standards with its exceptional cost-performance ratio. For enterprises pursuing "lean production," this equipment not only significantly reduces initial investments but also delivers machining quality comparable to new machines. When procuring, companies should evaluate both the current condition of the equipment and its potential for upgrades to maximize investment value. During this critical period of manufacturing transformation, choosing high-value Used pipe welding machines is undoubtedly a wise decision for achieving "cost reduction and efficiency improvement."

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In-depth Interpretation of Market Status
The current Used pipe welding machine market shows a "tripartite" pattern:

Japanese equipment accounts for about 35% (renowned for high precision)

German equipment accounts for 25% (known for durability)

Domestic equipment accounts for 40% (advantaged by pricing)

Among these, the three core competitive strengths of the Japanese 25 model Used pipe welding machine:

Precision retention: Maintains ±0.05mm machining accuracy even after 5 years of use

Energy efficiency: 18-22% more energy-efficient than comparable new domestic machines

Residual value rate: Retains over 40% residual value after 3 years of use

Core Technology Analysis
The four core systems of this Used pipe welding machine model:

High-precision forming system (7 horizontal rolls + 5 vertical rolls configuration)

Intelligent temperature-controlled welding system (±2°C precise temperature control)

Online inspection system (equipped with CCD visual inspection)

Energy-saving transmission system (servo motor + frequency conversion control)

Industry Application Big Data
In the automotive manufacturing sector:

Average production cost reduction: 42%

Production efficiency improvement: 28%

Defect rate reduction: Below 0.5%

In the architectural decoration sector:

Surface treatment compliance rate: 99.2%

Daily production capacity: Exceeds 5,000 linear meters

Product consistency deviation: <0.03mm

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Five critical dimensions to consider when purchasing Used pipe welding machines:

Equipment service years (recommend choosing machines under 5 years old)

Key component conditions (focus on high-frequency welding head wear)

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Supplier qualifications (prefer authorized service providers of Japanese brands)

Local service capabilities (service network with 2-hour response time)

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For a monthly production scale of 100,000 meters:

New machine investment: Approximately ¥2.8 million

Second-hand equipment: Approximately ¥1.2 million

Annual cost savings: ¥760,000 (including energy, maintenance, etc.)

Payback period: 19 months

Future Development Trends
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Adding IoT modules for remote monitoring (increases value by 15%)

Upgrading automatic mold-changing systems (improves efficiency by 20%)

Retrofitting intelligent sorting devices (reduces labor costs by 30%)

Conclusion:
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Processing range: Capable of producing square pipes (Φ40-100) and round pipes (Φ50-127) with wall thickness up to 5mm, at a production speed of 60m/min.

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Forming and welding: Includes 7 horizontal rolls and 9 vertical rolls forming unit, paired with 300kW solid-state high-frequency welder to ensure stable weld quality.

Auxiliary systems: Hydraulic uncoiler, shear welder, computer flying saw and Turk's head straightening device to enhance automation.

Process flow: Strip uncoiling→leveling→forming→high-frequency welding→cooling→sizing→cutting, ensuring continuous high-efficiency production.

The modular design simplifies maintenance, and after refurbishment, its performance approaches that of new machines while reducing procurement costs by 40%-60%, making it ideal for budget-conscious enterprises.

2. Key Points for Quality Assessment
According to industry standards, the quality of used pipe welding machines should be comprehensively evaluated from four aspects:

Materials and processes

Material durability: Core components such as rolls and high-frequency welders should be original to ensure corrosion resistance and tensile strength.

Process control: Welding quality directly affects joint strength, requiring precise regulation of high-frequency current's skin effect and proximity effect.

Appearance and performance

Visual inspection: The unit surface should be free of rust and deformation, with no significant wear on molds.

Performance test: Verify production speed, sizing accuracy (e.g. ovality ±0.05mm) and flying saw synchronization through trial operation.

After-sales service

Reputable suppliers like Jinyujie Electromechanical provide installation, spare parts support and technical training to reduce operational risks.

3. Market Advantages and Environmental Value
Cost-effectiveness

The 76-127 model typically costs only 50%-60% of new equipment while being ready for immediate use.

A Zhejiang-based enterprise reported 30% productivity improvement with significantly better ROI.

Sustainability

Refurbishing used equipment reduces resource waste, aligning with green manufacturing trends.

Industry adaptability

Widely used in construction (guardrails, scaffolding), automotive (exhaust pipes) and energy (oil pipelines) sectors, supporting various materials including carbon steel and stainless steel.

4. Maintenance and Risk Control
Routine maintenance

Regular lubrication and inspection of key components to prevent rust and damage.

Operation standards

Operators should receive proper training and wear protective equipment.

Procurement risks

Verify equipment sources and clarify responsibilities through formal agreements.

5. Industry Trends and Selection Recommendations
The domestic used pipe welding machine market grew 25% YoY in 2023, with increasing share of refurbished imported equipment. Selection suggestions:

Match production needs with equipment specifications

Choose reputable suppliers with comprehensive after-sales services

Conclusion
The 76-127 used pipe welding machine unit, with its mature technology, low cost and environmental benefits, has become an optimal choice for manufacturers seeking efficiency improvements. Enterprises should combine quality assessment, maintenance strategies and supplier services to maximize equipment value and promote sustainable development.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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With increasing emphasis on cost control and environmental protection in manufacturing, used pipe welding machines have become a popular choice for SMEs due to their cost-effectiveness and sustainability. This article takes the 76-127 model as an example, providing a comprehensive analysis from multiple dimensions including technical parameters, equipment configuration, quality assessment, market advantages and industrial applications.

1. Technical Parameters and Equipment Configuration
The 76-127 used pipe welding machine unit is renowned for its high efficiency and flexibility, with core parameters as follows:

Processing range: Capable of producing square pipes (Φ40-100) and round pipes (Φ50-127) with wall thickness up to 5mm, at a production speed of 60m/min.

Key configurations:

Forming and welding: Includes 7 horizontal rolls and 9 vertical rolls forming unit, paired with 300kW solid-state high-frequency welder to ensure stable weld quality.

Auxiliary systems: Hydraulic uncoiler, shear welder, computer flying saw and Turk's head straightening device to enhance automation.

Process flow: Strip uncoiling→leveling→forming→high-frequency welding→cooling→sizing→cutting, ensuring continuous high-efficiency production.

The modular design simplifies maintenance, and after refurbishment, its performance approaches that of new machines while reducing procurement costs by 40%-60%, making it ideal for budget-conscious enterprises.

2. Key Points for Quality Assessment
According to industry standards, the quality of used pipe welding machines should be comprehensively evaluated from four aspects:

Materials and processes

Material durability: Core components such as rolls and high-frequency welders should be original to ensure corrosion resistance and tensile strength.

Process control: Welding quality directly affects joint strength, requiring precise regulation of high-frequency current's skin effect and proximity effect.

Appearance and performance

Visual inspection: The unit surface should be free of rust and deformation, with no significant wear on molds.

Performance test: Verify production speed, sizing accuracy (e.g. ovality ±0.05mm) and flying saw synchronization through trial operation.

After-sales service

Reputable suppliers like Jinyujie Electromechanical provide installation, spare parts support and technical training to reduce operational risks.

3. Market Advantages and Environmental Value
Cost-effectiveness

The 76-127 model typically costs only 50%-60% of new equipment while being ready for immediate use.

A Zhejiang-based enterprise reported 30% productivity improvement with significantly better ROI.

Sustainability

Refurbishing used equipment reduces resource waste, aligning with green manufacturing trends.

Industry adaptability

Widely used in construction (guardrails, scaffolding), automotive (exhaust pipes) and energy (oil pipelines) sectors, supporting various materials including carbon steel and stainless steel.

4. Maintenance and Risk Control
Routine maintenance

Regular lubrication and inspection of key components to prevent rust and damage.

Operation standards

Operators should receive proper training and wear protective equipment.

Procurement risks

Verify equipment sources and clarify responsibilities through formal agreements.

5. Industry Trends and Selection Recommendations
The domestic used pipe welding machine market grew 25% YoY in 2023, with increasing share of refurbished imported equipment. Selection suggestions:

Match production needs with equipment specifications

Choose reputable suppliers with comprehensive after-sales services

Conclusion
The 76-127 used pipe welding machine unit, with its mature technology, low cost and environmental benefits, has become an optimal choice for manufacturers seeking efficiency improvements. Enterprises should combine quality assessment, maintenance strategies and supplier services to maximize equipment value and promote sustainable development.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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Core Performance: Precision and Efficiency for Diverse Needs
The Furuiwo 140 used pipe welding machine emphasizes practicality and stability, with key technical parameters as follows:

Processing Diameter Range: Φ60-159 mm, covering production needs from light-duty pipes to medium industrial pipelines;

Processing Thickness: Supports materials up to 5 mm, suitable for construction and machinery manufacturing;

Processing Speed: 60 meters/minute, significantly improving efficiency while reducing energy consumption.

The unit adopts a modular design for easy maintenance. After comprehensive inspection and upgrades by Furuiwo’s technical team, its performance is close to new machines, yet procurement costs are substantially lower.

Market Advantages: Economic and Environmental Value
Amid intensifying competition in manufacturing, used pipe welding machines are becoming a strategic choice for cost optimization. The Furuiwo 140 model stands out with the following advantages:

Cost Savings: Priced 40%-60% lower than new machines, ideal for budget-conscious SMEs;

Rapid Deployment: Pre-tested and ready for immediate use, shortening production setup time;

Sustainability: Extends equipment lifecycle, aligning with green manufacturing trends.

Wang Qiang, Furuiwo’s Sales Director, stated: “We are committed to providing high-value solutions. This used pipe welding machine not only ensures reliability but also comes with full after-sales support, including a one-year warranty and lifelong technical assistance.”

Applications: Versatility Across Industries
The unit processes carbon steel, stainless steel, and other materials, serving industries such as:

Construction: Production of guardrails and scaffold pipes;

Automotive: Exhaust pipes and chassis components;

Energy: Customized oil and water pipelines.

A Zhejiang-based pipe manufacturer reported: “After purchasing Furuiwo’s used pipe welding machine, our productivity increased by 30%, with costs halved compared to new equipment—ROI far exceeded expectations.”

Industry Outlook: Growing Demand for Used Equipment
As manufacturing upgrades, the used industrial equipment market is booming. Industry reports indicate a 25% year-on-year growth in China’s used pipe welding machine transactions in 2023, with refurbished imported brands gaining traction. Furuiwo, leveraging technical expertise and channel advantages, has emerged as a leader in this sector.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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Furuiwo Used 140 Pipe Welding Machine Unit: Cost-Effective Solution for Efficient Production

Recently, Furuiwo launched its highly anticipated used pipe welding machine—the 140 model pipe welding unit. With outstanding processing capabilities and significant cost-performance advantages, this equipment has become an ideal choice for small and medium-sized pipe processing enterprises.

Core Performance: Precision and Efficiency for Diverse Needs
The Furuiwo 140 used pipe welding machine emphasizes practicality and stability, with key technical parameters as follows:

Processing Diameter Range: Φ60-159 mm, covering production needs from light-duty pipes to medium industrial pipelines;

Processing Thickness: Supports materials up to 5 mm, suitable for construction and machinery manufacturing;

Processing Speed: 60 meters/minute, significantly improving efficiency while reducing energy consumption.

The unit adopts a modular design for easy maintenance. After comprehensive inspection and upgrades by Furuiwo’s technical team, its performance is close to new machines, yet procurement costs are substantially lower.

Market Advantages: Economic and Environmental Value
Amid intensifying competition in manufacturing, used pipe welding machines are becoming a strategic choice for cost optimization. The Furuiwo 140 model stands out with the following advantages:

Cost Savings: Priced 40%-60% lower than new machines, ideal for budget-conscious SMEs;

Rapid Deployment: Pre-tested and ready for immediate use, shortening production setup time;

Sustainability: Extends equipment lifecycle, aligning with green manufacturing trends.

Wang Qiang, Furuiwo’s Sales Director, stated: “We are committed to providing high-value solutions. This used pipe welding machine not only ensures reliability but also comes with full after-sales support, including a one-year warranty and lifelong technical assistance.”

Applications: Versatility Across Industries
The unit processes carbon steel, stainless steel, and other materials, serving industries such as:

Construction: Production of guardrails and scaffold pipes;

Automotive: Exhaust pipes and chassis components;

Energy: Customized oil and water pipelines.

A Zhejiang-based pipe manufacturer reported: “After purchasing Furuiwo’s used pipe welding machine, our productivity increased by 30%, with costs halved compared to new equipment—ROI far exceeded expectations.”

Industry Outlook: Growing Demand for Used Equipment
As manufacturing upgrades, the used industrial equipment market is booming. Industry reports indicate a 25% year-on-year growth in China’s used pipe welding machine transactions in 2023, with refurbished imported brands gaining traction. Furuiwo, leveraging technical expertise and channel advantages, has emerged as a leader in this sector.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

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Small cost replacement of 140 second-hand welded pipe equipment
Small cost replacement of 140 second-hand welded pipe equipment
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Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with  diameter of 60-159mm, square and rectangular pipes with  diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.

more datail about this 140 enlarged 165 used tube mill line, please check here:

https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html



For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill 
Detail
Q: Why did you choose this refurbished 140 to 165 second-hand welded pipe equipment/used tube mill?
Answer: Three core advantages:
The processing capacity of this used pipe making machine includes round pipes with  diameter of 60-159mm, square and rectangular pipes with  diameter of 50 * 50-120 * 120mm, anda wall thickness of 2.0-5.0mm, fully covering the mainstream demand of the welded pipe equipment market.
Refurbishment guarantee for Used ERW tube mill machinery: All mechanical and electrical components undergo professional maintenance/replacement, and the life assessment of key components meets the standards. The renovation and maintenance process for second-hand welded pipe equipment takes at least one month and up to three months.
The cost efficiency of the second-hand high-frequency welded pipe machine is only 45% of that of the new welded pipe machine. The production line of the used welded pipe mills production line sold by our company includes a one-year extended warranty, free training, and lifelong technical support.
Q: After purchasing second-hand welded pipe equipment, how long can it be put into production?
Answer: Jin Yujie Company's second-hand welded pipe equipment is all sourced from first-hand sources, with stock in the warehouse. It takes 7 days to ship and 15 days to complete installation and commissioning. The second-hand welded pipe unit can be purchased and used immediately.
It is recommended to arrange a technical team and decision-makers to conduct on-site inspections of the warehouse as soon as possible, select a second-hand welded pipe unit on site, in order to put it into production as soon as possible, create production capacity for the second-hand welded pipe production line, and achieve profitability.

more datail about this 140 enlarged 165 used tube mill line, please check here:

https://www.usedpipemill.com/product/Forever-Used-High-Frequency-Welding-Pipe-Making-Machie-of-%CE%A6140-Expand-to-%CE%A6165MM-221.html



For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com

JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill 
Contact information
Tel: +86-13392281699
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province

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