ERW steel pipe from Tianjin Xinyue Steel Group, with its durable function, has devoted to various engineering projects nowadays. Of course, there are some points we should take care during the production of the ERW steel pipe.
1. Inclusions (fired black oxide) : inclusions may cause the bad performance like intensity and corrosion resistance problem.
2. Pre-arc (white burn oxidation): pre-arc would have the influence for hardness of the steel pipe.
3. Lack of fusion (slotted): slotted problem has similar affects like the inclusion.
4. Lack of fusion in the center (cold welding center): Cold welding center has the influence for endurance too.
5. Edge not Fusion (wavy edge): wavy edge would have the problem of leakage if they used for some fluid or gas transportation.
6. Rod welding (welding)
7. Cast welding (weld welding)
8. Pores (pinhole)
9. Jump welding
http://www.xysteelpipe.com/info/Common-defects-for-ERW-steel-pipe-936-1.htm
2018年3月13日星期二
Raw materials on quality of steel pipe
There are demands for various steel pipes from seamless steel pipe, ERW steel pipe, galvanized steel pipe as well as SSAW steel pipe in market for transportation of low pressure products like water and high pressure products like oil and gas.
However, no matter which kind of steel pipe we choose from, we know that raw material would play an important role during the steel pipe’s production process.
1. From the point of welding, the influence of raw material on quality of ERW steel pipe is mainly reflected in welding and organization of materials.
2. The composition of the elements in raw material would lead to the impact on intensity, hardness. For example, high content of sulfur and phosphorus in the material can easily cause segregation of crystals. And so does for the impact of high carbon content, too large grain size of the metal structure.
Once we choose the relevant standards from API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387 about ERW steel pipe, it is our responsibility to know their difference before purchasing.
http://www.xysteelpipe.com/info/Raw-materials-on-quality-of-steel-pipe-937-1.htm
However, no matter which kind of steel pipe we choose from, we know that raw material would play an important role during the steel pipe’s production process.
1. From the point of welding, the influence of raw material on quality of ERW steel pipe is mainly reflected in welding and organization of materials.
2. The composition of the elements in raw material would lead to the impact on intensity, hardness. For example, high content of sulfur and phosphorus in the material can easily cause segregation of crystals. And so does for the impact of high carbon content, too large grain size of the metal structure.
Once we choose the relevant standards from API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387 about ERW steel pipe, it is our responsibility to know their difference before purchasing.
http://www.xysteelpipe.com/info/Raw-materials-on-quality-of-steel-pipe-937-1.htm
Application of spiral steel tube
What is the scope of application of the spiral steel tubes Spiral steel pipes are widely used industrial, construction and other industries of steel, is widely used in various production areas, both inside and outside, oil, gas, sewage treatment plant, water, water supply and drainage, water conservancy project construction pile driving with steel tube, the signs, overhead Bridges and other industries.
1, generally low pressure fluid conveying with seam submerged arc spiral welded pipe scale on hot rolled steel coil tube billet, often temperature spiral forming, adopting double automatic submerged arc welding or one side welding into legal system for water, gas, air and steam general low-pressure fluid conveying with submerged arc welding steel pipe.
2, low pressure fluid conveying in spiral welded pipe steel pipe is also called general welded pipe, commonly known as the clarinet. Is used to transport oil, gas, air, water and heating steam and other general low pressure fluid and other purposes of welded steel pipe.
3, low pressure fluid conveying with galvanized welded steel pipe is also called galvanized welded steel pipe, commonly known as the white tube. Is used to transport oil, gas, air, water and heating steam, warm water generally low pressure fluid or other purposes such as hot dip galvanized welded butt weld or welding steel pipe. Steel tube wall thickness is divided into ordinary galvanized steel pipe and thickening of galvanized steel pipe; To take over the side form is divided into without thread galvanized steel pipe and galvanized steel pipe with screws. Specifications of steel pipe in nominal diameter and nominal diameter is inside diameter of approximation.
4, pressurized fluid conveying with submerged arc welding spiral pipe scale on hot rolled steel coil tube billet, often spiral shape, with double-sided submerged arc welding method, welding, spiral seam steel pipe used for pressurized fluid conveying. Steel tube confined ability, good welding function, through a variety of strict scientific inspection and testing, the use of safe and reliable. Steel pipe diameter is big, high transmission efficiency, and can save laying pipelines. Mainly used for conveying oil, natural gas pipeline.
1, generally low pressure fluid conveying with seam submerged arc spiral welded pipe scale on hot rolled steel coil tube billet, often temperature spiral forming, adopting double automatic submerged arc welding or one side welding into legal system for water, gas, air and steam general low-pressure fluid conveying with submerged arc welding steel pipe.
2, low pressure fluid conveying in spiral welded pipe steel pipe is also called general welded pipe, commonly known as the clarinet. Is used to transport oil, gas, air, water and heating steam and other general low pressure fluid and other purposes of welded steel pipe.
3, low pressure fluid conveying with galvanized welded steel pipe is also called galvanized welded steel pipe, commonly known as the white tube. Is used to transport oil, gas, air, water and heating steam, warm water generally low pressure fluid or other purposes such as hot dip galvanized welded butt weld or welding steel pipe. Steel tube wall thickness is divided into ordinary galvanized steel pipe and thickening of galvanized steel pipe; To take over the side form is divided into without thread galvanized steel pipe and galvanized steel pipe with screws. Specifications of steel pipe in nominal diameter and nominal diameter is inside diameter of approximation.
4, pressurized fluid conveying with submerged arc welding spiral pipe scale on hot rolled steel coil tube billet, often spiral shape, with double-sided submerged arc welding method, welding, spiral seam steel pipe used for pressurized fluid conveying. Steel tube confined ability, good welding function, through a variety of strict scientific inspection and testing, the use of safe and reliable. Steel pipe diameter is big, high transmission efficiency, and can save laying pipelines. Mainly used for conveying oil, natural gas pipeline.
16mn seamless steel tube is widely used
16 mn seamless steel tube is widely used in combustible and flammable fluid pipeline and boiler, steel structure. This is not to deceive consumers fakes, but according to the requirements of the equipment and produce steel pipe, seamless steel pipe between pure seamless and welded pipe, the quality is better than that of welded pipe, the cost is lower than the pure seamless, is an ideal substitute products. Production of the developed countries in the world has been extensively used in fluid pipe, boiler tube welded pipe seamless process, with the development of the society, the domestic situation of hot rolled welded pipe instead of seamless tube gradually has formed.
1, the principle of 16 mn seamless steel tube stacking requirements are on the premise of pallet firm, ensure safety, do according to the bottle, pallet specifications, different varieties, different materials, different specifications of the spiral welded steel pipe to pallet respectively, prevent the erosion of muddied and each other.
2.16 mn low forbidden deposit around the steel pipe piling location for steel tube erosion.
3. The bottom of the spiral welded steel pipe pile should be mat tall, strong, smooth, prevent the material to be affected with damp be affected with damp or deformation.
4. The same material of the spiral welded steel pipe needs according to the order of warehouse stacking, easy to implement the principle of improving predecessors starts.
5. Such as 16 mn seamless steel tube pile up in the open, must under the spiral steel tube to prevent the wood or stone, and buttress face should be tilted slightly, to facilitate drainage, and pay attention to whether or not steel pipe lay flat, prevent the steel tube bending deformation.
6. The spiral steel pipe stacking height, artificial homework no more than 1.2 m, mechanical work no more than 1.5 m, crib is not more than 2.5 m wide.
7. Between the spiral welded steel pipe pile and pile should have certain channels, check the width of the road in 0.5 m or so commonly, in and out of the channel width and transport machinery, according to the volume of material in commonly 1.5 to 2 m.
8.16 mn seamless steel tube pile bottom pad high level according to the specific situation, if the warehouse to the cement ground in xiangyang, higher height of 0.1 m; If the mud, must be 0.2 to 0.5 m high. If stored in the open, cement floor MATS should be from 0.3 to 0.3 m high, high silt ground pad should be from 0.5 to 0.5 m.
1, the principle of 16 mn seamless steel tube stacking requirements are on the premise of pallet firm, ensure safety, do according to the bottle, pallet specifications, different varieties, different materials, different specifications of the spiral welded steel pipe to pallet respectively, prevent the erosion of muddied and each other.
2.16 mn low forbidden deposit around the steel pipe piling location for steel tube erosion.
3. The bottom of the spiral welded steel pipe pile should be mat tall, strong, smooth, prevent the material to be affected with damp be affected with damp or deformation.
4. The same material of the spiral welded steel pipe needs according to the order of warehouse stacking, easy to implement the principle of improving predecessors starts.
5. Such as 16 mn seamless steel tube pile up in the open, must under the spiral steel tube to prevent the wood or stone, and buttress face should be tilted slightly, to facilitate drainage, and pay attention to whether or not steel pipe lay flat, prevent the steel tube bending deformation.
6. The spiral steel pipe stacking height, artificial homework no more than 1.2 m, mechanical work no more than 1.5 m, crib is not more than 2.5 m wide.
7. Between the spiral welded steel pipe pile and pile should have certain channels, check the width of the road in 0.5 m or so commonly, in and out of the channel width and transport machinery, according to the volume of material in commonly 1.5 to 2 m.
8.16 mn seamless steel tube pile bottom pad high level according to the specific situation, if the warehouse to the cement ground in xiangyang, higher height of 0.1 m; If the mud, must be 0.2 to 0.5 m high. If stored in the open, cement floor MATS should be from 0.3 to 0.3 m high, high silt ground pad should be from 0.5 to 0.5 m.
2018年3月2日星期五
Shape requirement of LSAW steel pipe
LSAW steel pipe weld appearance basic requirements:
Straight seam steel pipe before NDT, weld visual inspection should meet the requirements. General requirements for straight seam steel pipe weld appearance and surface quality of welded joints are as follows:
Welding should look good shape, width of each side groove edge 2mm overshadowed appropriate. Fillet weld leg height should meet the design requirements, the shape should be smooth transition.
Welded joint surface requirements:
(1) Does not allow cracks, lack of fusion, pores, slag, spatter exist.
(2) The design temperature is below -29 degrees pipes, stainless steel and hardened alloy steel pipes tend to be larger weld surface, without undercut. Other material pipe weld undercut depth should be greater than 0.5mm, continuous undercut length should not exceed 100mm, and both sides of the weld undercut always grow up to 10 percent of the entire length of the weld.
(3) Shall not be lower than the surface of the weld surface of the pipe. Weld reinforcement and no more than 3mm, (the maximum width of weld joints after groove).
(4) Welded joints the wrong side of the wall thickness should be less than 10% and not more than 2mm.
Straight seam steel pipe before NDT, weld visual inspection should meet the requirements. General requirements for straight seam steel pipe weld appearance and surface quality of welded joints are as follows:
Welding should look good shape, width of each side groove edge 2mm overshadowed appropriate. Fillet weld leg height should meet the design requirements, the shape should be smooth transition.
Welded joint surface requirements:
(1) Does not allow cracks, lack of fusion, pores, slag, spatter exist.
(2) The design temperature is below -29 degrees pipes, stainless steel and hardened alloy steel pipes tend to be larger weld surface, without undercut. Other material pipe weld undercut depth should be greater than 0.5mm, continuous undercut length should not exceed 100mm, and both sides of the weld undercut always grow up to 10 percent of the entire length of the weld.
(3) Shall not be lower than the surface of the weld surface of the pipe. Weld reinforcement and no more than 3mm, (the maximum width of weld joints after groove).
(4) Welded joints the wrong side of the wall thickness should be less than 10% and not more than 2mm.
Description of production process equipment of seamless steel pipe
1. Oiled marking: steel pipe hydrostatic testing machine after passing were oiled to prevent corrosion, and according to user requirements for marking.
2. Leveling milling: the flat steel anvil machine so that the original curl, and then through the edge milling machine for two-sided steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape.
3. Shear molding: the steel plate production line along the outer edge of the spiral curl into a tube.
4. Butt cut: seamless steel pipe market equipment using advanced technology pre double submerged arc welding, internal welding, outside welding. The welded steel pipe using a plasma-foot cut to specification length.
5. Visual inspection: by professional and technical personnel to some of the basic parameters to be checked.
6. The ultrasonic flaw detection: scrap development of the inner and outer sides of the base metal and weld seam 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray industrial TV check image processing system to ensure that the use of detection sensitivity.
8. The pressure test: the steel pipe hydrostatic testing machine shall be tested individually to ensure that the test pressure pipe meet the required standards.
9. Chamfering flat head: seamless steel pipe inspection devices will be qualified after the pipe end processing, to meet the requirements of the pipe end (spiral welded pipe mill) groove dimensions.
10. Final inspection: leveler again ultrasound and X-ray detection as well as magnetic particle inspection pipe end, check if there are problems and welding pipe ends defects.
11. Unwinding board probe: After entering the unwinding plate production line, the first full-board ultrasonic testing.
2. Leveling milling: the flat steel anvil machine so that the original curl, and then through the edge milling machine for two-sided steel milling, so as to meet the requirements of the plate width, plate edge parallelism and groove shape.
3. Shear molding: the steel plate production line along the outer edge of the spiral curl into a tube.
4. Butt cut: seamless steel pipe market equipment using advanced technology pre double submerged arc welding, internal welding, outside welding. The welded steel pipe using a plasma-foot cut to specification length.
5. Visual inspection: by professional and technical personnel to some of the basic parameters to be checked.
6. The ultrasonic flaw detection: scrap development of the inner and outer sides of the base metal and weld seam 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray industrial TV check image processing system to ensure that the use of detection sensitivity.
8. The pressure test: the steel pipe hydrostatic testing machine shall be tested individually to ensure that the test pressure pipe meet the required standards.
9. Chamfering flat head: seamless steel pipe inspection devices will be qualified after the pipe end processing, to meet the requirements of the pipe end (spiral welded pipe mill) groove dimensions.
10. Final inspection: leveler again ultrasound and X-ray detection as well as magnetic particle inspection pipe end, check if there are problems and welding pipe ends defects.
11. Unwinding board probe: After entering the unwinding plate production line, the first full-board ultrasonic testing.
2018年3月1日星期四
Technical analysis of galvanized seamless steel pipe
Due to the wide range of applications of galvanized seamless steel pipe, there are lots of manufacturers have workshop for this product. Generally speaking, the production process is no difference, whether it is hot-dip seamless tube, or cold-plated seamless pipe. Today, Tianjin Xinyue steel pipe would have a detail list for process production of galvanized seamless steel pipe.
First of all, furnace roll mill:
The mill includes of a reciprocating roughing mill and a 4-roll reciprocating mill. Two hot-rolling mills were installed on the conveyor lines on both sides of the finishing mill. The output roller train normally consists of a laminar cooling system and a take-up station.
What's more, CSP casting and rolling:
In the CSP production line, there is process for controlling of niobium, vanadium, titanium composite micro-alloyed low-carbon manganese steel. The use of appropriate controlled rolling and cooling and coiling can ensure the mechanical properties and micro-structure of the pipe line with the modern X60 stainless steel stamping elbow The technical requirements, in line with the development of modern stainless steel pipe fittings elbow.
http://www.xysteelpipe.com/info/Technical-analysis-of-galvanized-seamless-steel-pipe-912-1.htm
First of all, furnace roll mill:
The mill includes of a reciprocating roughing mill and a 4-roll reciprocating mill. Two hot-rolling mills were installed on the conveyor lines on both sides of the finishing mill. The output roller train normally consists of a laminar cooling system and a take-up station.
What's more, CSP casting and rolling:
In the CSP production line, there is process for controlling of niobium, vanadium, titanium composite micro-alloyed low-carbon manganese steel. The use of appropriate controlled rolling and cooling and coiling can ensure the mechanical properties and micro-structure of the pipe line with the modern X60 stainless steel stamping elbow The technical requirements, in line with the development of modern stainless steel pipe fittings elbow.
http://www.xysteelpipe.com/info/Technical-analysis-of-galvanized-seamless-steel-pipe-912-1.htm
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