Schedule 40 seamless steel pipe specification, application and process flow

• schedule 40 seamless steel pipe is a kind of pipe with hollow section, which is widely used for conveying fluid. The production process of seamless steel pipe is to pierce a solid tube blank or ingot into a hollow capillary tube, and then roll it into a steel tube of the required size. General purpose for water, gas pipelines and structural parts, mechanical parts / special for high pressure boilers, geological exploration, bearings, etc.

Schedule 40 seamless steel pipe uses 1. Constructions include: the most underground pipeline transportation, groundwater extraction when building buildings, boiler hot water transportation, etc. 2. Machining, bearing sleeves, processing machinery parts, etc. 3. Electrical: gas transmission, water power generation fluid pipeline. 4. Anti-static pipes for wind power plants, etc.

• The maximum diameter of seamless steel pipe is 900mm, and the minimum diameter is 3mm.

Common materials for seamless steel pipes: 20#, 45#, Q345B, 27SiMn, 12Cr1Mov, 42CrMo, 40Cr, 45CrMo, 20G, 15CrMoG, 12Cr1MoVG, etc.

Weight calculation formula: [(outer diameter-wall thickness)*wall thickness]*0.02466=kg/meter (weight per meter)

Dimensions and tolerances

• Production process of seamless steel pipe: The tube blank should first be rolled with three rolls. After extrusion, the sizing test should be carried out. If the surface does not respond to cracks, the round tube should be cut by a cutting machine and cut into a billet with a length of about one meter. . Then enter the annealing process, annealing should be pickled with acidic liquid, and pay attention to whether there is a large amount of blistering on the surface during pickling.

Tube blank - inspection - peeling - inspection - heating - perforation - pickling - mushroom repair - lubrication and air drying - welding head - cold drawing - solution treatment - pickling - pickling Passivation - Inspection - Constant Temperature Storage - Delivery

Execution standard and corresponding material of seamless steel pipe

1. GB/T8162-1999 (Theoretical weight of seamless steel pipe galvanized steel pipe for structure). Mainly used for general structure and mechanical structure. Its representative material (brand): carbon steel, 20, 45 steel; alloy steel Q345, 20C galvanized steel pipe price r, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.

2. GB/T8163-1999 (seamless steel pipe for conveying fluid). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. On behalf of the ceramic composite steel pipe material (brand) is 20, Q345 and so on.

3. GB3087-1999 (low Wuxi seamless steel pipe seamless steel pipe for medium pressure boiler). Mainly used in industrial boilers and domestic boilers to transport low and medium pressure fluid pipelines. The representative material is 10, 20 steel.

4. GB5310-1995 (seamless steel pipes for high pressure boilers). Mainly used for high temperature, high pressure fluid transfer headers and pipes on power plants and Tianjin seamless steel tube nuclear power plant boilers. The representative materials are 20G, 12Cr1MoVG, 15CrMoG steel pipe scaffolding, etc.

5. GB5312-1999 (carbon steel and carbon-manganese steel seamless steel tubes for ships). China's seamless steel pipe network is mainly used for I and II pressure-resistant pipes for marine boilers and superheaters. The representative material is 360, 410, 460 steel grades, etc.

6. GB1479-2000 (seamless steel pipe for high pressure fertilizer equipment). It is mainly used for high-temperature and high-pressure fluid pipelines sent to Tianjin Steel Pipe Group by chemical fertilizer equipment. The representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.

7. GB9948-1988 (seamless steel pipes for petroleum cracking). Mainly used for boilers in petroleum smelters, heat exchange scaffolding steel pipe heaters and their transmission fluid pipelines. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.

8. GB18248-2000 (Seamless steel pipes for gas cylinders). Mainly used to make various gas welded steel pipes and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.

Common materials for seamless steel pipes

1. Small-diameter high-pressure boiler tubes for automobiles (special for Buick cars) 210C, 15CrMoG, 12Cr1MoVG, T12~T91 series steel pipes are produced according to domestic and foreign standards or industry standards. West-East Gas Pipeline Pipeline GB/T9711.2 L245NB Φ1146, Φ895, etc., Subsea Oil Pipeline API5L X52 PSL2 Φ8910, Φ114.311.1

2. Oilfield pipe N80 non-quenched and tempered pipe API 5CT Φ139.77.72 J55 oil pipe API 5CT Φ735.51. Protocol standard for special pipes for lattice booms (integral quenched and tempered pipes), 20Mn2B, 20Mn2, Φ14615, etc., used for lifting equipment for crawler tower cranes

3. Special cylinder and bracket tubes T91, steel 102 series high pressure boiler tubes GB5310-1995, used in high temperature and high pressure environments of thermal power plants. Tractor rear axle tube 35MnVN, rear axle of crawler tractor. Ultra-high-strength structural tubes 35CrMnsi, 30CrMnSiNi2A, used in military industry, aircraft landing gear tubes

4. The rock gangue protocol standard J55, Φ266, Φ316, etc., are used for the reinforcement of highways and large hydropower station dams. Hydraulic strut pipe GB/T17396-1998, 27SiMn, used for support and fixation of coal machine underground operation. ASTM A210, 210C, Φ606 medium carbon steel seamless pipes for boilers and superheaters produced according to American standards

5. Automobile half shaft casing YB/T5035-1996, 45Mn245, super long heat exchanger tube 20, Φ19216000-21000, used for heat exchanger, seamless tube for fork rod CR-1, Φ485, used for train CR bogie cross bar for speed increase, anti-seawater corrosion pipe Q/CG41, 10CrMoA1, Φ1084, Φ252.5

6. The submersible motor shaft tube protocol standard Φ3111, Φ3613.5, 40Cr, 35CrMo, 35CrMoV, used for the motor shaft of the oil pump. Pipes for low temperature pipeline GB/T18984-2003, 09DG, 10MnDG, 09Mn2VDG, B655, used for fluid transportation pipelines in low temperature environment in petrochemical industry, pipes for nuclear power plants

7. Stainless steel seamless tubes for boilers and heat exchangers GB13296-1991, 0Cr18Ni9Ti, 0Cr18Ni11Ti, Φ1928900, etc. Precision seamless steel tubes 10, 20, etc. for periscope tubes, automobile and motorcycle shock absorbers.