1. Carbon steel pipe quality inspection and acceptance by the supplier technical quality supervision department
2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards
3. Carbon steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards.
4. Carbon steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, hot-rolled seamless steel tube can be sampled by rolling the root array.
5. Carbon steel pipe test results, a non-compliance with product standards, should be unqualified singled out, and from the same batch of steel pipe, either take double the number of samples for failure of the project re-test .
If the result of the re-inspection (including any one of the requirements of the test) is unqualified, the pipe shall not be delivered.
The following test items, initial inspection failed, do not allow re-inspection:
A. White spots in low magnification tissue.
B. Microstructure.
6. The re-inspection results are unqualified (including the initial test results of microstructure failure, does not allow re-inspection of the project) of the pipe, the supplier can be submitted to the acceptance by the root; or re-heat treatment (re-heat treatment shall not exceed twice) To the latest batch of acceptance.
7. If the product standards are not specified, the chemical composition of mild steel pipe smelting components for acceptance.
2016年12月4日星期日
2016年12月2日星期五
SSAW Steel Pipe
Spiral submerged arc welded steel pipe is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral.
Spiral submerged arc (SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral, the advantage of the same specification to produce a variety of diameter sizes steel pipe, raw materials to adapt to a wider range, the weld can avoid the main stress force better, the disadvantage is the poor geometry of the weld length compared to the LSAW steel pipe, prone to cracking, porosity, slag, welding partial welding defects such as welding stress was tensile stress state. General Oil and Gas Pipeline design specification spiral submerged arc can only be used for Class 3, Class 4 regional. Raw materials instead will this process improvement abroad steel plate forming and welding separate pre-weld and lean and, after welding cold flaring near UOE pipe welding quality, currently no such process of plant improvement direction. “West-East” still is a traditional craft production, just expanded diameter of the pipe end. United States, Japan and Germany, the overall negative SSAW, think the mainline unfit for use SSAW; Canada and Italy part SSAW Russian small amount of SSAW, and have developed a very strict supplementary conditions, due to historical reasons, the majority of the domestic main trunk or use SSAW mild steel pipe.
Spiral submerged arc (SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral, the advantage of the same specification to produce a variety of diameter sizes steel pipe, raw materials to adapt to a wider range, the weld can avoid the main stress force better, the disadvantage is the poor geometry of the weld length compared to the LSAW steel pipe, prone to cracking, porosity, slag, welding partial welding defects such as welding stress was tensile stress state. General Oil and Gas Pipeline design specification spiral submerged arc can only be used for Class 3, Class 4 regional. Raw materials instead will this process improvement abroad steel plate forming and welding separate pre-weld and lean and, after welding cold flaring near UOE pipe welding quality, currently no such process of plant improvement direction. “West-East” still is a traditional craft production, just expanded diameter of the pipe end. United States, Japan and Germany, the overall negative SSAW, think the mainline unfit for use SSAW; Canada and Italy part SSAW Russian small amount of SSAW, and have developed a very strict supplementary conditions, due to historical reasons, the majority of the domestic main trunk or use SSAW mild steel pipe.
ERW Steel Pipe
ERW steel pipes means Electric Resistance welded steel pipe. ERW steel pipes and tubes are used.
High frequency straight seam welding (ERW) method is divided into two forms of induction welding and contact welding, hot-rolled wide volume as raw material, pre-curved, continuous molding, welding, heat treatment, sizing, straightening, cutting, etc. process, compared with the spiral weld short, high dimensional accuracy, uniform thickness, surface quality, pressure advantages, but the drawback is that only the production of small and medium-caliber thin-walled mild steel pipe, weld easy to produce gray leaf spot, not fusion ditch-like corrosion defects. Wider application areas of city gas, crude oil transportation.
High frequency straight seam welding (ERW) method is divided into two forms of induction welding and contact welding, hot-rolled wide volume as raw material, pre-curved, continuous molding, welding, heat treatment, sizing, straightening, cutting, etc. process, compared with the spiral weld short, high dimensional accuracy, uniform thickness, surface quality, pressure advantages, but the drawback is that only the production of small and medium-caliber thin-walled mild steel pipe, weld easy to produce gray leaf spot, not fusion ditch-like corrosion defects. Wider application areas of city gas, crude oil transportation.
What Are the Uses of Carbon Steel?
Carbon steel is a metal alloy that combines iron and carbon. The various uses of carbon steel depend on the amount of carbon added to the alloy; for instance, carbon steel with the lowest amount of carbon is called wrought iron and is used for things like fencing. Medium-carbon steel, also called mild steel pipe, is the type of steel that is used for structural purposes in buildings and bridges. High-carbon steel is used for springs and steel wires, while ultra-high carbon steel is called cast iron and is often used to make pots.
There are two types of steel alloy that are typically familiar to the average person: carbon steel and stainless steel. Carbon steel combines iron with carbon, while stainless steel combines iron with chromium. It is easy for most people to identify stainless steel, because the chromium creates a shiny coating over the metal that is reflective and nonporous, making stainless steel simple to clean and decorative. One of the common definitions of carbon steel is any steel that is not stainless.
The carbon in carbon steel makes the metal harder and stronger than stainless steel, but it is also less malleable. Adding greater quantities of carbon to the alloy mixture results in carbon steel that is increasingly harder and more brittle. There are four categories of carbon structural steel pipe that are distinguishable by the amount of carbon added to the alloy mixture. The uses of carbon steel depend on this category classification.
Carbon steel with the lowest carbon content is typically called wrought iron; the metal is hard, but not brittle. This type of carbon steel is used for fences, chain links, gates and railings. Its lower carbon content means that it has the flexibility to be “worked” into designs for ornamental purposes.
The most commonly used carbon steel has a medium carbon content; uses of carbon steel in this category include structural steel to build buildings and bridges. It is also used for parts in consumer products like automobiles, refrigerators and washing machines. Ships use medium-carbon steel as a structural component.
High-carbon steel is hard but brittle and less easily worked. The uses of carbon steel in this category are typically for manufacturing purposes. This type of carbon steel is often used to create springs and high-strength wires. The increased hardness makes this category of steel ideal for cutting tools, punches, dies and industrial knives.
Carbon steel with ultra-high carbon content is commonly referred to as cast iron. This type of cast iron is very hard but highly brittle. It has little to no malleability and cannot be easily welded or tooled. Often, it is used for cast iron pots, hot water radiators and certain types of lamp posts. Industrially, this type of carbon steel pipe is used for castings, because the high carbon content lowers the melting point.
There are two types of steel alloy that are typically familiar to the average person: carbon steel and stainless steel. Carbon steel combines iron with carbon, while stainless steel combines iron with chromium. It is easy for most people to identify stainless steel, because the chromium creates a shiny coating over the metal that is reflective and nonporous, making stainless steel simple to clean and decorative. One of the common definitions of carbon steel is any steel that is not stainless.
The carbon in carbon steel makes the metal harder and stronger than stainless steel, but it is also less malleable. Adding greater quantities of carbon to the alloy mixture results in carbon steel that is increasingly harder and more brittle. There are four categories of carbon structural steel pipe that are distinguishable by the amount of carbon added to the alloy mixture. The uses of carbon steel depend on this category classification.
Carbon steel with the lowest carbon content is typically called wrought iron; the metal is hard, but not brittle. This type of carbon steel is used for fences, chain links, gates and railings. Its lower carbon content means that it has the flexibility to be “worked” into designs for ornamental purposes.
The most commonly used carbon steel has a medium carbon content; uses of carbon steel in this category include structural steel to build buildings and bridges. It is also used for parts in consumer products like automobiles, refrigerators and washing machines. Ships use medium-carbon steel as a structural component.
High-carbon steel is hard but brittle and less easily worked. The uses of carbon steel in this category are typically for manufacturing purposes. This type of carbon steel is often used to create springs and high-strength wires. The increased hardness makes this category of steel ideal for cutting tools, punches, dies and industrial knives.
Carbon steel with ultra-high carbon content is commonly referred to as cast iron. This type of cast iron is very hard but highly brittle. It has little to no malleability and cannot be easily welded or tooled. Often, it is used for cast iron pots, hot water radiators and certain types of lamp posts. Industrially, this type of carbon steel pipe is used for castings, because the high carbon content lowers the melting point.
Methods of Cutting Large Diameter Seamless Steel Pipes
Large diameter seamless carbon steel pipe is over 1000MM, which is made from steel ingot or solid tube, and then processed by hot rolling or cold rolling. Sometimes, the seamless steel pipes is longer or short while using. Short seamless steel pipes can be welded, longer seamless steel pipes can be cut off. Here are three methods of cutting large diameter seamless steel pipes to proper length to meet industry needs.
1. By saw machine
Saw machine can make neat section which is convenient for welding. The disadvantage is low efficiency.
2. By gas cutting
Though gas cutting is fast, the disadvantage is presented notched surface which is not good for construction.
3. By cnc cutting machine
By cnc cutting machine, seamless carbon steel pipe manufacturers will not save a lot cost but also can obtain smooth section of seamless steel pipe which has not much difference from cutting by saw machine.
If you are looking for a new range of strong and durable pipes, you have come at the right and one of the popular seamless steel pipe manufacturers. Shinestar Steel is certified and reputed manufacturer and supplier of seamless steel pipes and a variety of other pipes and tubes for various industrial applications. These pipes are of premium quality and made by following all the quality and safety guidelines. We deliver them worldwide at wholesale prices. Our prices are reasonable and will be lower than others. Manufacturer’s warranty is an added advantage that will ensure that you are getting the best quality at competitive prices. We have these pipes in different measurements that you can choose according to your choice. Please go through our selection of available seamless mild steel pipe and tubes and place your order.
1. By saw machine
Saw machine can make neat section which is convenient for welding. The disadvantage is low efficiency.
2. By gas cutting
Though gas cutting is fast, the disadvantage is presented notched surface which is not good for construction.
3. By cnc cutting machine
By cnc cutting machine, seamless carbon steel pipe manufacturers will not save a lot cost but also can obtain smooth section of seamless steel pipe which has not much difference from cutting by saw machine.
If you are looking for a new range of strong and durable pipes, you have come at the right and one of the popular seamless steel pipe manufacturers. Shinestar Steel is certified and reputed manufacturer and supplier of seamless steel pipes and a variety of other pipes and tubes for various industrial applications. These pipes are of premium quality and made by following all the quality and safety guidelines. We deliver them worldwide at wholesale prices. Our prices are reasonable and will be lower than others. Manufacturer’s warranty is an added advantage that will ensure that you are getting the best quality at competitive prices. We have these pipes in different measurements that you can choose according to your choice. Please go through our selection of available seamless mild steel pipe and tubes and place your order.
2016年12月1日星期四
Acceptance Ruled of Carbon Steel Pipe
1. Carbon steel pipe quality inspection and acceptance by the supplier technical quality supervision department
2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards
3. Carbon steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards.
4. Carbon seamless steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, seamless structural steel pipe can be sampled by rolling the root array.
5. Carbon seamless steel pipe test results, a non-compliance with product standards, should be unqualified singled out, and from the same batch of steel pipe, either take double the number of samples for failure of the project re-test .
If the result of the re-inspection (including any one of the requirements of the test) is unqualified, the pipe shall not be delivered.
The following test items, initial inspection failed, do not allow re-inspection:
A. White spots in low magnification tissue.
B. Microstructure.
6. The re-inspection results are unqualified (including the initial test results of microstructure failure, does not allow re-inspection of the project) of the pipe, the supplier can be submitted to the acceptance by the root; or re-heat treatment (re-heat treatment shall not exceed twice) To the latest batch of acceptance.
7. If the product standards are not specified, the chemical composition of mild steel pipe smelting components for acceptance.
2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards
3. Carbon steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards.
4. Carbon seamless steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, seamless structural steel pipe can be sampled by rolling the root array.
5. Carbon seamless steel pipe test results, a non-compliance with product standards, should be unqualified singled out, and from the same batch of steel pipe, either take double the number of samples for failure of the project re-test .
If the result of the re-inspection (including any one of the requirements of the test) is unqualified, the pipe shall not be delivered.
The following test items, initial inspection failed, do not allow re-inspection:
A. White spots in low magnification tissue.
B. Microstructure.
6. The re-inspection results are unqualified (including the initial test results of microstructure failure, does not allow re-inspection of the project) of the pipe, the supplier can be submitted to the acceptance by the root; or re-heat treatment (re-heat treatment shall not exceed twice) To the latest batch of acceptance.
7. If the product standards are not specified, the chemical composition of mild steel pipe smelting components for acceptance.
Advantages of Steel Pipe Transportation
The main advantages of mild steel pipe transportation can be summarized as follows:
(1) Large volume.
An oil pipeline can continue to complete the delivery task. Depending on the size of its diameter, its annual traffic up to several million tons to tens of millions of tons, or even more than 100 million tons.
(2) Small footprint.
Transport pipelines are often buried underground and occupy very little land; the construction of transport systems proves that the buried part of the pipeline is more than 95% of the total length of the pipeline, so the permanent occupation of the land is very small, 3% of the highway, about 10% of the railway, in the transportation planning system, give priority to pipeline transportation program, for the conservation of land resources, is of great significance.
(3) Pipeline transportation construction period is short and low cost.
A large number of domestic and foreign transportation system construction practice proved that the carbon steel pipe transportation system construction period and the same volume of the railway construction period compared to the general short of 1/3 or more. Historically, China's construction of Daqing to Qinhuangdao length of 1,152 kilometers of oil pipeline, only 23 months, and to build a railway with the same volume of traffic, at least three years, Xinjiang to Shanghai, the whole 4,200 km long natural gas pipeline, the expected construction period will not exceed 2 years, but if the same volume of the new railway line, the construction period of 3 years or more, especially geological and climatic conditions and relatively poor conditions, large-scale construction The railway will be more difficult, the cycle will be longer, the statistics show that the cost of pipeline construction is about 60% lower than the railway.
(4) Pipeline transportation safe and reliable, continuous strong.
As the oil and natural gas is flammable, explosive, volatile, easy to leak, the use of mild steel pipe transportation, both safe and can greatly reduce the volatile loss, while leakage due to air, water and soil pollution can be greatly reduced, that is to say , Pipeline transportation can better meet the transport engineering green requirements, in addition, because the pipeline is basically buried in the ground, its transport process harsh and changeable weather conditions affect small, can ensure long-term stable operation of the transport system.
(5) Pipeline transportation with less energy consumption, low cost and good benefits.
Developed countries use pipeline transportation of oil, less than one ton of energy consumption per kilometer of railway 1/7, in a large number of transportation costs and water transport close, so in anhydrous conditions, the use of carbon steel pipe transportation is one of the most energy-efficient mode of transport . The theoretical analysis and practical experience have proved that the larger the pipe diameter, the farther the transportation distance, the greater the transportation volume, the more the transportation cost will be, the higher the transportation cost is, the higher the transportation cost is. Low, to transport oil, for example, pipeline transportation, water transport, rail transport transport costs ratio of 1: 1: 1.7.
More information about steel pipeline transportation,pls visit:Hunan Great Steel Pipe Co.,ltd
(1) Large volume.
An oil pipeline can continue to complete the delivery task. Depending on the size of its diameter, its annual traffic up to several million tons to tens of millions of tons, or even more than 100 million tons.
(2) Small footprint.
Transport pipelines are often buried underground and occupy very little land; the construction of transport systems proves that the buried part of the pipeline is more than 95% of the total length of the pipeline, so the permanent occupation of the land is very small, 3% of the highway, about 10% of the railway, in the transportation planning system, give priority to pipeline transportation program, for the conservation of land resources, is of great significance.
(3) Pipeline transportation construction period is short and low cost.
A large number of domestic and foreign transportation system construction practice proved that the carbon steel pipe transportation system construction period and the same volume of the railway construction period compared to the general short of 1/3 or more. Historically, China's construction of Daqing to Qinhuangdao length of 1,152 kilometers of oil pipeline, only 23 months, and to build a railway with the same volume of traffic, at least three years, Xinjiang to Shanghai, the whole 4,200 km long natural gas pipeline, the expected construction period will not exceed 2 years, but if the same volume of the new railway line, the construction period of 3 years or more, especially geological and climatic conditions and relatively poor conditions, large-scale construction The railway will be more difficult, the cycle will be longer, the statistics show that the cost of pipeline construction is about 60% lower than the railway.
(4) Pipeline transportation safe and reliable, continuous strong.
As the oil and natural gas is flammable, explosive, volatile, easy to leak, the use of mild steel pipe transportation, both safe and can greatly reduce the volatile loss, while leakage due to air, water and soil pollution can be greatly reduced, that is to say , Pipeline transportation can better meet the transport engineering green requirements, in addition, because the pipeline is basically buried in the ground, its transport process harsh and changeable weather conditions affect small, can ensure long-term stable operation of the transport system.
(5) Pipeline transportation with less energy consumption, low cost and good benefits.
Developed countries use pipeline transportation of oil, less than one ton of energy consumption per kilometer of railway 1/7, in a large number of transportation costs and water transport close, so in anhydrous conditions, the use of carbon steel pipe transportation is one of the most energy-efficient mode of transport . The theoretical analysis and practical experience have proved that the larger the pipe diameter, the farther the transportation distance, the greater the transportation volume, the more the transportation cost will be, the higher the transportation cost is, the higher the transportation cost is. Low, to transport oil, for example, pipeline transportation, water transport, rail transport transport costs ratio of 1: 1: 1.7.
More information about steel pipeline transportation,pls visit:Hunan Great Steel Pipe Co.,ltd
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