1. Seamless pipes for structures (GB / t8162-2008) are seamless pipes for general structures and mechanical structures.
2. Seamless pipe for fluid transportation (GB / t8163-2008) is a general seamless pipe used to transport water, oil, gas and other fluids.
3. Seamless tubes for low and medium pressure boilers (gb3087-2008) are high-quality carbon structural steel hot-rolled and cold drawn (rolled) seamless tubes used to manufacture superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers.
4. Seamless tubes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless tubes used for the heating surface of water tube boilers with high pressure and above.
5. High pressure seamless pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless pipe suitable for chemical equipment and pipeline with working temperature of – 40 ~ 400 ℃ and working pressure of 10 ~ 30mA.
6. Seamless tubes for petroleum cracking (GB9948-2006) are seamless tubes for furnace tubes, heat exchangers and pipelines in petroleum refineries.
7. The steel pipe for geological drilling (yb235-70) is the steel pipe used by the geological department for core drilling. According to the purpose, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe.
8. Seamless pipe for diamond core drilling (gb3423-82) is the seamless pipe of drill pipe, rock core rod and casing used for diamond core drilling.
9. Oil drilling pipe (yb528-65) is a seamless pipe used for internal or external thickening at both ends of oil drilling.
Seamless pipe
Seamless pipe
10. Marine carbon steel seamless pipe (gb5312-85)
China Classification Society material and Welding Code – China Classification Society (CCS)
Det Norske Veritas (DNV) code – det Norske Veritas (DNV)
Lloyd’s register of shipping (LR) code – Lloyd’s register of shipping (LR)
GL rules – GL
American Bureau of shipping (ABS) code – American Bureau of shipping (ABS)
Bureau Veritas (BV) code – Bureau Veritas (BV)
Rina rules – Rina
Japan Classification Society (NK) code – Japan Classification Society (NK)
It is a carbon steel seamless pipe for manufacturing class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of carbon steel seamless pipe wall shall not exceed 450 ℃, and that of alloy steel seamless pipe wall shall not exceed 450 ℃.
11. Seamless pipe for automobile half axle sleeve (gb3088-82) is a hot-rolled seamless pipe of high-quality carbon structural steel and alloy structural steel for manufacturing automobile half axle sleeve and axle shell of drive axle.
12. High pressure oil pipe for diesel engine (gb3093-86) is a cold drawn seamless pipe for manufacturing high pressure pipe of diesel engine injection system.
13. Precision inner diameter seamless pipe for hydraulic and pneumatic cylinder barrel (GB8713-88) is a cold drawn or cold rolled precision seamless pipe with precision inner diameter for manufacturing hydraulic and pneumatic cylinder barrel.
14. Cold drawn or cold rolled precision seamless pipe (gb3639-83) is a cold drawn or cold rolled precision seamless pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. Select precision seamless pipe to manufacture mechanical structure or hydraulic equipment.
15. Stainless steel seamless pipe for structure (GB / T14975-2002) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless pipe made of stainless steel for corrosion-resistant pipes, structural parts and parts widely used in chemical, petroleum, light textile, medical, food, machinery and other industries.
16. Stainless steel seamless pipe for fluid transportation (GB / T14976-2002) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless pipe made of stainless steel for fluid transportation.
17. Special shaped seamless pipe is the general name of seamless pipes with other cross-section shapes except circular pipe. According to the different shape and size of steel pipe section, it can be divided into equal wall thickness special-shaped seamless pipe (code D), unequal wall thickness special-shaped seamless pipe (code BD) and variable diameter special-shaped seamless pipe (code BJ). Special shaped seamless pipe is widely used in various structural parts, tools and mechanical parts.
18. Seamless steel pipe for low temperature pipeline (GB / t18984-2003) is a seamless steel pipe for low temperature pressure vessel pipeline of – 45 ℃ ~ – 195 ℃ grade and low temperature heat exchanger pipeline
Generally, seamless pipes are made of high-quality carbon bonded steels such as 10, 20, 30, 35 and 45, low-alloy structural steels such as 16Mn and 5mnv, or bonded steels such as 40Cr, 30CrMnSi, 45Mn2 and 40MnB. 10. Seamless pipes made of low carbon steel such as 20 are mainly used for fluid transmission pipelines. Seamless pipes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors.
Generally, the strength and flattening test of seamless pipe shall be ensured. Hot rolled steel pipes shall be delivered in hot rolling state or heat treatment state; Cold rolling is delivered in heat treated condition. Seamless tubes for low and medium pressure boilers: used to manufacture all kinds of low and medium pressure boilers, superheated steam tubes, boiling water tubes, water wall tubes and superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers.
Hot rolled or cold rolled seamless pipe made of high-quality carbon structural steel. It is mainly made of 10 and 20 steel. In addition to ensuring chemical composition and mechanical properties, hydrostatic test, crimping, flaring, flattening and other tests shall be carried out. Hot rolling shall be delivered in hot rolling state, and cold rolling (dialing) shall be delivered in heat treatment state.
Calculation formula of seamless management theory:
(outer diameter – wall thickness) × Wall thickness × 0.02466 = weight of seamless pipe per meter {kg}
Post time: Mar-08-2022