There are three main deformation processes throughout hot rolled seamless steel pipe production methods.
1. Perforating.
Perforation methods are common rotary piercing and pressure perfortion. In addition, we can use centrifugal casting, continuous casting with electroslag re-melting and other methods to obtain a hollow shell and to eliminate the perforation step.
2. Rolling.
On the extension machine, the pipe billit will roll thin capillary and become close to extending the original pipe wall thickness. The common type of rolling methods including continuous rolling, rolling cycle, automatic rolling tube, top tube, three roll rolllin, two roll rolling etc.
3. Finishing.
The main process for pipe finishing are sizing and reducing. The goal is to achieve improved accuracy of the pipe thickness, improve the surface quality, improve pipe roundness and expand the product specifications.
2019年7月22日星期一
Ordinary seamless steel tube standard
1. General purpose seamless steel pipe ASTM A53 GR.B, steel number: SA53 B, specification: 1/4′′-28′′, 13.7-711.2mm
2. Seamless steel pipe for high temperature operation ASTM A106 GR.B, steel number: SA106B, specification: 1/4′′-28′′, 13.7-711.2mm
3. Line pipe API SPEC 5L, steel number: B, X42, X46, X52, specifications: 1/4"-28", 13.7-711.2mm
4.ASTM A106/A53/API 5L GR.B, steel number: B, specification: 1/4"-28", 13.7-711.2mm
5. Seamless low carbon steel pipe ASTM A179 for heat exchangers and condensers, size: 3/4′′, 1′′
6.-40°C-101°C seamless steel pipe ASTM A333 for low temperature operation, steel number: GR.A, GR.1, GR.6, GR.7, GR.3, specification: 1/4′′-28′′, 13.7-711.2mm
7. German standard DIN2448/1629 seamless steel pipe, steel number: St37, St44, St52, specifications: 1/4"-28", 13.7-711.2mm
8. Heat-resistant steel seamless steel pipe (heat-strength pipe) DIN17175-1979, steel number: carbon structural steel St35.8-St45.8/I, St35.8-St45.8/III, alloy structural steel 15Mo3, 13CrMo44 , 10CrMo910, specifications: 1/4"-28", 13.7-711.2mm
9. Structural seamless steel pipe GB/T8162-1999, steel number: 10#, 20#, 35#, 45#, 16Mn (Q345), specification: 6-720×1-70mm
10. Seamless steel pipe for conveying fluid GB/T8163-1999, steel number: 10#, 20#, 16Mn (Q345), specification: 6-720×1-70mm
11. Low and medium pressure boiler tube GB3087-1999, steel number: 10#, 20#, specification: 6-720×1-70mm
12. High pressure boiler tube GB5310-1995, steel number: 20G, specification: 6-720×1-70mm
2. Seamless steel pipe for high temperature operation ASTM A106 GR.B, steel number: SA106B, specification: 1/4′′-28′′, 13.7-711.2mm
3. Line pipe API SPEC 5L, steel number: B, X42, X46, X52, specifications: 1/4"-28", 13.7-711.2mm
4.ASTM A106/A53/API 5L GR.B, steel number: B, specification: 1/4"-28", 13.7-711.2mm
5. Seamless low carbon steel pipe ASTM A179 for heat exchangers and condensers, size: 3/4′′, 1′′
6.-40°C-101°C seamless steel pipe ASTM A333 for low temperature operation, steel number: GR.A, GR.1, GR.6, GR.7, GR.3, specification: 1/4′′-28′′, 13.7-711.2mm
7. German standard DIN2448/1629 seamless steel pipe, steel number: St37, St44, St52, specifications: 1/4"-28", 13.7-711.2mm
8. Heat-resistant steel seamless steel pipe (heat-strength pipe) DIN17175-1979, steel number: carbon structural steel St35.8-St45.8/I, St35.8-St45.8/III, alloy structural steel 15Mo3, 13CrMo44 , 10CrMo910, specifications: 1/4"-28", 13.7-711.2mm
9. Structural seamless steel pipe GB/T8162-1999, steel number: 10#, 20#, 35#, 45#, 16Mn (Q345), specification: 6-720×1-70mm
10. Seamless steel pipe for conveying fluid GB/T8163-1999, steel number: 10#, 20#, 16Mn (Q345), specification: 6-720×1-70mm
11. Low and medium pressure boiler tube GB3087-1999, steel number: 10#, 20#, specification: 6-720×1-70mm
12. High pressure boiler tube GB5310-1995, steel number: 20G, specification: 6-720×1-70mm
High Strength Corrosion Resistant and Environmentally Friendly Anticorrosive Coating
High strength corrosion resistant and environmentally friendly anticorrosive coating - IPN8710 coatings are specially designed for the distribution of water distribution pipes.
Cold drawn (rolled) seamless steel pipe. Cold drawn (rolled) tubes are divided into two types: round tubes and shaped tubes.
a. Process flow overview Hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → blank tube → straightening → hydraulic test (or flaw detection) → marking → Storage.
b. Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydraulic test (inspection) → mark → storage.
First, Spiral steel pipe, straight seam steel pipe and seamless steel pipe are used as base material for processing anti-corrosion steel pipe. The types of anti-corrosion processing are as follows:
1. Oil and gas are treated with 3pe steel pipe anti-corrosion and two-layer polyethylene (2PE) steel pipe.
2. FBE anti-corrosion steel pipe for oil and gas (single-layer sintered epoxy powder anti-corrosion) steel pipe, 2FBE (double-layer melting epoxy powder anti-corrosion) steel pipe. standard: SY/T0315-97
3, water supply pipeline cement mortar lining steel pipe internal corrosion protection. Standard: CECS10:89
4. Epoxy coal tar pitch glass cloth steel pipe anti-corrosion. Standard: GB50268-97
5, water supply pipeline IPN8710 polymer non-toxic paint steel pipe anti-corrosion.
6, sales of epoxy coal bitumen anti-corrosion coatings, IPN8710 coatings, chlorinated rubber anti-corrosion coatings, polyurethane anti-corrosion coatings, and other anti-corrosion coatings.
7, high-density polyethylene polyurethane foam insulation steel pipe.
Second, the biggest advantage of IPN8710 coating is that it has good durability. The film after curing of epoxy resin is tough and water resistant, the coating film is non-toxic, and it has no pollution to water. Strong adhesion, good adhesion between paint film and paint film. It has excellent rust and
water resistance and uses excellent anti-rust materials to ensure its anti-rust properties. It has good mechanical strength, tough film, abrasion resistance and impact resistance. High solid content and thick coating film. Curing to film at room temperature. No large baking equipment is required. It
is widely used in the inner wall coating of water supply equipment such as drinking water tanks, water pipes, water tanks and water towers, and in the cargo tanks of sugar and grain. It can also be used as a swimming pool, a power plant cooling tower, and an inner wall coating for fuel oil, gasoline metal,
and concrete.
Third, PN8710 anti-corrosion coating technical indicators and storage methods
Applicable period: 8 hours
Thinner and dosage: special thinner, ≤ 5%
Coating method: brush, roller or spray coating interval: the shortest 4 hours, the longest 3 days .
Film thickness: wet film: 200μm dry film: theoretical dosage
Surface treatment: remove oil stains, dust, welding slag, and oxidized into loose rust on the
Surface of the anti-corrosion parts to keep the surface dry and free of dirt.
Matching primer: IPN8710 anti-corrosion primer, IPN8710-4 thick paste anti-corrosion primer.
Storage period: 12 months
Fourth, secondly understand the precautions of IPN8710 anti-corrosion coating: the product should be stored in a cool, ventilated and dry place, isolated from the fire source, away from heat.
This product is a thick paste type paint, which can be applied thickly without sag. It can be brushed without adding thinner after opening the barrel.
After the coating period is too long, it will precipitate slightly and should be stirred before use.
After the paint is prepared, it will be matured for 20 minutes in the summer and 1.5-2 hours after the winter ripening. It is usually used up within 8 hours, otherwise the viscosity will thicken and it is not easy to construct.
After the primer is dry, the topcoat can be applied. The interval at room temperature should not exceed two days. Otherwise, the interlayer bonding will be affected. The time gap between the coatings of each layer is also better.
Cold drawn (rolled) seamless steel pipe. Cold drawn (rolled) tubes are divided into two types: round tubes and shaped tubes.
a. Process flow overview Hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → blank tube → straightening → hydraulic test (or flaw detection) → marking → Storage.
b. Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydraulic test (inspection) → mark → storage.
First, Spiral steel pipe, straight seam steel pipe and seamless steel pipe are used as base material for processing anti-corrosion steel pipe. The types of anti-corrosion processing are as follows:
1. Oil and gas are treated with 3pe steel pipe anti-corrosion and two-layer polyethylene (2PE) steel pipe.
2. FBE anti-corrosion steel pipe for oil and gas (single-layer sintered epoxy powder anti-corrosion) steel pipe, 2FBE (double-layer melting epoxy powder anti-corrosion) steel pipe. standard: SY/T0315-97
3, water supply pipeline cement mortar lining steel pipe internal corrosion protection. Standard: CECS10:89
4. Epoxy coal tar pitch glass cloth steel pipe anti-corrosion. Standard: GB50268-97
5, water supply pipeline IPN8710 polymer non-toxic paint steel pipe anti-corrosion.
6, sales of epoxy coal bitumen anti-corrosion coatings, IPN8710 coatings, chlorinated rubber anti-corrosion coatings, polyurethane anti-corrosion coatings, and other anti-corrosion coatings.
7, high-density polyethylene polyurethane foam insulation steel pipe.
Second, the biggest advantage of IPN8710 coating is that it has good durability. The film after curing of epoxy resin is tough and water resistant, the coating film is non-toxic, and it has no pollution to water. Strong adhesion, good adhesion between paint film and paint film. It has excellent rust and
water resistance and uses excellent anti-rust materials to ensure its anti-rust properties. It has good mechanical strength, tough film, abrasion resistance and impact resistance. High solid content and thick coating film. Curing to film at room temperature. No large baking equipment is required. It
is widely used in the inner wall coating of water supply equipment such as drinking water tanks, water pipes, water tanks and water towers, and in the cargo tanks of sugar and grain. It can also be used as a swimming pool, a power plant cooling tower, and an inner wall coating for fuel oil, gasoline metal,
and concrete.
Third, PN8710 anti-corrosion coating technical indicators and storage methods
Applicable period: 8 hours
Thinner and dosage: special thinner, ≤ 5%
Coating method: brush, roller or spray coating interval: the shortest 4 hours, the longest 3 days .
Film thickness: wet film: 200μm dry film: theoretical dosage
Surface treatment: remove oil stains, dust, welding slag, and oxidized into loose rust on the
Surface of the anti-corrosion parts to keep the surface dry and free of dirt.
Matching primer: IPN8710 anti-corrosion primer, IPN8710-4 thick paste anti-corrosion primer.
Storage period: 12 months
Fourth, secondly understand the precautions of IPN8710 anti-corrosion coating: the product should be stored in a cool, ventilated and dry place, isolated from the fire source, away from heat.
This product is a thick paste type paint, which can be applied thickly without sag. It can be brushed without adding thinner after opening the barrel.
After the coating period is too long, it will precipitate slightly and should be stirred before use.
After the paint is prepared, it will be matured for 20 minutes in the summer and 1.5-2 hours after the winter ripening. It is usually used up within 8 hours, otherwise the viscosity will thicken and it is not easy to construct.
After the primer is dry, the topcoat can be applied. The interval at room temperature should not exceed two days. Otherwise, the interlayer bonding will be affected. The time gap between the coatings of each layer is also better.
Analysis of influencing factors of weld impact toughness of ERW steel pipe
How to improve the impact toughness of ERW steel pipe welds is a major problem in the technology of pipe making. On the basis of mass production practices, various factors affecting the impact toughness of ERW straight seam resistance welded steel pipe welds were analyzed. It is pointed out that in order to further improve the impact toughness of welds and meet the high toughness requirements of long-distance pipelines for ERW steel pipes, it is necessary to start with the control of the quality of raw material coils, combined with the pipe-making process, and strengthen the quality control of forming, welding and on-line heat treatment after welding.
1 ERW steel pipe weld joint toughness characteristics
The welding process of ERW steel pipe uses the principle of skin effect produced by high-frequency current to heat the edge of the hot rolled plate to the molten state, and then it is welded by the mechanical extrusion method. A white fusion line appears at the center of the weld seam of the steel pipe produced by this process, and the heat affected zone on both sides of the fusion line will generate a metal flow line extending from the middle to the inner and outer surfaces. As the ERW steel pipe uses the base metal as the welding material, the performance of the weld seam is greatly related to the performance of the base metal. In ordinary materials, there is little difference in the absorbed energy value of the Charpy impact test between the weld and the base metal. On the contrary, there is a big difference in high-toughness materials. The weld joints are significantly inferior to the parent metal in terms of impact toughness, but they are significantly better than those of common materials. It can be seen that the impact toughness of the center of the weld of the ERW steel pipe, even if the use of high toughness materials, although the toughness of the weld is improved, but can not completely improve the impact toughness of the weld center.
2 Influence factors of weld impact toughness
The main factors affecting the impact toughness of welds are:
(1) Physical and chemical properties of raw materials
(2) Grain size and non-metallic inclusions of raw materials
(3) Heat treatment conditions of welds
(4) Forming conditions
(5) Welding conditions
http://www.xysteelpipe.com/info/Analysis-of-influencing-factors-of-weld-impact-toughness-of-ERW-steel-pipe-1462-1.htm
1 ERW steel pipe weld joint toughness characteristics
The welding process of ERW steel pipe uses the principle of skin effect produced by high-frequency current to heat the edge of the hot rolled plate to the molten state, and then it is welded by the mechanical extrusion method. A white fusion line appears at the center of the weld seam of the steel pipe produced by this process, and the heat affected zone on both sides of the fusion line will generate a metal flow line extending from the middle to the inner and outer surfaces. As the ERW steel pipe uses the base metal as the welding material, the performance of the weld seam is greatly related to the performance of the base metal. In ordinary materials, there is little difference in the absorbed energy value of the Charpy impact test between the weld and the base metal. On the contrary, there is a big difference in high-toughness materials. The weld joints are significantly inferior to the parent metal in terms of impact toughness, but they are significantly better than those of common materials. It can be seen that the impact toughness of the center of the weld of the ERW steel pipe, even if the use of high toughness materials, although the toughness of the weld is improved, but can not completely improve the impact toughness of the weld center.
2 Influence factors of weld impact toughness
The main factors affecting the impact toughness of welds are:
(1) Physical and chemical properties of raw materials
(2) Grain size and non-metallic inclusions of raw materials
(3) Heat treatment conditions of welds
(4) Forming conditions
(5) Welding conditions
http://www.xysteelpipe.com/info/Analysis-of-influencing-factors-of-weld-impact-toughness-of-ERW-steel-pipe-1462-1.htm
2019年7月12日星期五
What is the performance index analysis of square pipe?
What is the performance index analysis of square pipe?
1. Plasticity
Plasticity refers to the ability of a metal material to undergo plastic deformation (permanent deformation) without damage under load.
2. Hardness
Hardness is a measure of the hardness of a metal material. At present, the most commonly used method for measuring hardness in production is the indentation hardness method, which presses the surface of the metal material to be tested under a certain load with a certain geometry of the indenter, and determines the hardness value according to the degree of being pressed.
Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
3. Fatigue
The strength, plasticity, and hardness discussed above are all indicators of the mechanical properties of the metal under static load. In fact, many machine parts work under cyclic loading, under which conditions parts can fatigue.
4. Impact toughness
The load acting on the machine at a large speed is called the impact load, and the ability of the metal to resist damage under the impact load is called impact toughness.
5. Strength
Strength refers to the property of a metal material against damage (excessive plastic deformation or fracture) under static load. Since the action mode of the load is tensile, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, shear strength and the like. There is often a certain relationship between various strengths, and tensile strength is generally used as the most basic strength indicator.
1. Plasticity
Plasticity refers to the ability of a metal material to undergo plastic deformation (permanent deformation) without damage under load.
2. Hardness
Hardness is a measure of the hardness of a metal material. At present, the most commonly used method for measuring hardness in production is the indentation hardness method, which presses the surface of the metal material to be tested under a certain load with a certain geometry of the indenter, and determines the hardness value according to the degree of being pressed.
Commonly used methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).
3. Fatigue
The strength, plasticity, and hardness discussed above are all indicators of the mechanical properties of the metal under static load. In fact, many machine parts work under cyclic loading, under which conditions parts can fatigue.
4. Impact toughness
The load acting on the machine at a large speed is called the impact load, and the ability of the metal to resist damage under the impact load is called impact toughness.
5. Strength
Strength refers to the property of a metal material against damage (excessive plastic deformation or fracture) under static load. Since the action mode of the load is tensile, compression, bending, shearing, etc., the strength is also divided into tensile strength, compressive strength, bending strength, shear strength and the like. There is often a certain relationship between various strengths, and tensile strength is generally used as the most basic strength indicator.
2019年7月11日星期四
How to distinguish seamless steel pipe from welded steel pipe
The difference between a seamless tube and a conventional welded tube is that the main differences between the two types of tubes are only apparent. There is a general understanding of the difference between a seamless tube and a common welded tube. Seamless pipes and ordinary welded pipes are mainly formed by different molding processes. Ordinary steel pipes, such as tap water pipes, are generally welded by bending the flat plates, and a weld seam can be found on the above; the coarser diameter is generally a spiral weld.
The seamless steel pipe is generally formed by laminating molten steel in a molten state through a circular slit and then being subjected to a stretching process, so that there is no weld, the strength of the pipe is naturally higher, the industrial value is also increased, and the price is also slightly higher. For ordinary welded pipes. Seamless pipes and ordinary welded pipes are greatly improved in performance, especially in pressure bearing capacity, and are often used in high-voltage equipment. Such as the piping connection of hydraulic equipment. The weld seam of ordinary steel pipe is its weak link, and the weld quality is also the main factor affecting its overall performance. People who have lived in the north generally have experienced the experience that the water pipes or heating pipes are frozen in the winter. The places where the explosions are usually welded. Welded pipes are not as strong as seamless steel pipes. By comparing the above two points, it is easy to distinguish between the seamless pipe and the ordinary welded pipe when purchasing the pipe.
Although the price of ordinary welded pipe is very cheap, its service life is quite short, especially in the northern region, so it is recommended to purchase a cost-effective seamless pipe for long-term industrial use.
http://www.xysteelpipe.com/info/How-to-distinguish-seamless-steel-pipe-from-welded-steel-pipe-1454-1.htm
The seamless steel pipe is generally formed by laminating molten steel in a molten state through a circular slit and then being subjected to a stretching process, so that there is no weld, the strength of the pipe is naturally higher, the industrial value is also increased, and the price is also slightly higher. For ordinary welded pipes. Seamless pipes and ordinary welded pipes are greatly improved in performance, especially in pressure bearing capacity, and are often used in high-voltage equipment. Such as the piping connection of hydraulic equipment. The weld seam of ordinary steel pipe is its weak link, and the weld quality is also the main factor affecting its overall performance. People who have lived in the north generally have experienced the experience that the water pipes or heating pipes are frozen in the winter. The places where the explosions are usually welded. Welded pipes are not as strong as seamless steel pipes. By comparing the above two points, it is easy to distinguish between the seamless pipe and the ordinary welded pipe when purchasing the pipe.
Although the price of ordinary welded pipe is very cheap, its service life is quite short, especially in the northern region, so it is recommended to purchase a cost-effective seamless pipe for long-term industrial use.
http://www.xysteelpipe.com/info/How-to-distinguish-seamless-steel-pipe-from-welded-steel-pipe-1454-1.htm
Usage of Hollow Structural Sections
HSS (hollow structural sections) refers to a metal profile that is hollow and tubular. This hollow structural tube (or HSS) is used as a structural element in buildings, bridges and other structures, and in a wide variety of manufactured products. It's produced in round, square and rectangular shapes in a broad range of sizes and gauges.
According to EN10219, EN10225, API and ASTM standards, in a wide range of geometries and wall thickness in HFW, HSAW and LSAW production, suitable for very demanding highly-stressed steel structures such as:
1. Road and Pedestrian Bridges
2. Roofs, Hangars and various Superstructures widely used in airports, stadiums, shopping malls etc.
3. Long-span and slender steel structures
4. Cranes, booms and masts
5. Earth-moving, agricultural & machinery equipment frameworks
6. Road, railway-car and trailer frames
7. Lighting and traffic-poles, road-sign frameworks
8. Jacket foundations for offshore OG & wind power
9. Offshore platform top-sides
10. Jack-up rig frameworks
11. Pile foundations
According to EN10219, EN10225, API and ASTM standards, in a wide range of geometries and wall thickness in HFW, HSAW and LSAW production, suitable for very demanding highly-stressed steel structures such as:
1. Road and Pedestrian Bridges
2. Roofs, Hangars and various Superstructures widely used in airports, stadiums, shopping malls etc.
3. Long-span and slender steel structures
4. Cranes, booms and masts
5. Earth-moving, agricultural & machinery equipment frameworks
6. Road, railway-car and trailer frames
7. Lighting and traffic-poles, road-sign frameworks
8. Jacket foundations for offshore OG & wind power
9. Offshore platform top-sides
10. Jack-up rig frameworks
11. Pile foundations
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