ASTM A335 P11 Seamless Pipe, 16 Inch, 6M, SCH 80, ASME B36.10, Beveled Ends, Black Surface.

Description

Alloy steel pipe in English (Alloy steel pipe) the greatest advantage can be 100% recovery, in line with the national strategy of environmental protection, energy saving, resource saving, national policy to encourage the expansion of high-pressure alloy pipe applications. At present, the proportion of alloy pipe consumption in total steel in China is only half of that in developed countries, and the expansion of alloy pipe use field provides a broader space for the development of the industry. According to the research of the expert group of the alloy pipe branch of China Special Steel Association, the demand for high pressure alloy pipe long material in China will increase by 10-12% per year in the future. Alloy pipe is defined by steel pipe according to production material (that is, material), as the name implies is alloy pipe, and seamless pipe is defined by steel pipe according to production process (seamless), which is different from seamless pipe is sewn pipe. Including straight seam welded pipe and spiral pipe.

Production process
Hot rolling (extruded seamless steel pipe): pipe billet → heating → perforation → three-roll oblique rolling, continuous rolling or extrusion → pipe → diameter (or diameter reduction) cooling pipe straightening → hydraulic test (or flaw detection) marking → storage.
Cold drawing (rolling) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating), multi-pass cold drawing (cold rolling)→ billet tube heat treatment, straightening → water pressure test (flaw detection) marking → storage.
Classification
Seamless steel pipe for structure: mainly used in general structure and mechanical structure. Its representative material (brand): carbon steel 20,45 steel; alloy steel Q345,20Cr,40Cr,20CrMo,30-35CrMo,42CrMo.

Seamless steel pipe for conveying fluid: mainly used for conveying fluid pipes on engineering and large equipment. representative material (brand number) is 20, Q345, etc.
Seamless steel pipe for low medium pressure boiler: mainly used in industrial boiler and domestic boiler to transport low medium pressure fluid pipeline. Representative material is 10,20 steel.
Seamless steel pipe for high pressure boiler: It is mainly used for high temperature and high pressure conveying fluid header and pipeline on power station and nuclear power plant boiler. Representative material is 20 G,12Cr1MoVG,15CrMoG, etc.
Carbon steel and carbon manganese steel seamless steel pipe for ship: mainly used for ship boiler and superheater I,II grade pressure resistant pipe. Representative material is 360,410,460 steel grade etc.
Seamless steel pipe for high pressure chemical fertilizer equipment: mainly used for conveying high temperature and high pressure fluid pipeline on chemical fertilizer equipment. representative material is 20,16 Mn,12CrMo,12Cr2Mo etc.
Seamless steel pipe for petroleum cracking: boiler, heat exchanger and its conveying fluid pipeline mainly used in petroleum smelter. and its representative material is 20,12 CrMo,1Cr5Mo,1Cr19Ni11Nb, etc.
Seamless steel pipe for gas cylinders: mainly used to make various gas and hydraulic cylinders. Its representative material is 37 Mn,34Mn2V,35CrMo and so on.
Hot rolled seamless steel pipe for hydraulic prop: mainly used to make coal mine hydraulic support and cylinder, column, and other hydraulic cylinder, column. and its representative material is 20,45,27 SiMn etc.
High pressure seamless steel pipe for diesel engine: mainly used for high pressure tubing of diesel engine injection system. Generally, its steel pipe is cold-drawn pipe, its representative material is 20 A.
Cold drawn or cold rolled precision seamless steel pipe: mainly used for mechanical structure, carbon pressure equipment, high dimensional accuracy, good surface finish steel pipe. Its representative material 20,45 steel and so on.

Alloy tubes are roughly made of Mn,27SiMn,40Cr,12-42CrMo 16Mn12Cr1MoV,T91:16-50 27SiMn 30CrMo 15CrMo 20G Cr9Mo 10CrMo910 15Mo3 15CrMoV 35CrMoV 45CrMo ,15CrMoG,12CrMoV,45Cr,50Cr,45CrNiMo, etc.

The name of steel is the name of each specific steel product a common language for people to understand steel. China's rigid sign representation method generally uses the Chinese phonetic alphabet, chemical elements ​ symbols and Arabic numerals to express the following we specifically introduce the alloy steel material elements and symbols meaning:

1. high quality steel should be added "A"," at the end of the steel number to distinguish it from general high quality steel.

2. A special purpose alloy structural steel with a steel symbol (or suffix) representing the purpose of the steel. Such as riveting screw special 30 CrMnSi steel, steel number expressed as ML30CrMnSi.

3. For professional low alloy high strength steel, it should be marked at the end of the steel number. Such as 16 Mn steel, the special type of steel for bridge is "16 Mnq", special type of steel for automobile girder "16 MnL", special type of steel for pressure vessel "16 MnR".