Alloy seamless steel pipe (Steel Tube Seamless) with hollow section, no
joints around the strip steel. Steel pipe with hollow section, a large number of
pipelines used to transport fluid, such as the transmission of oil, natural gas,
coal gas, water and some solid materials, such as pipelines, etc.. Compared with
other solid steel alloy seamless steel pipe steel, flexural torsional strength
in the same time, the weight is light, is a kind of economic section steel,
widely used in the manufacture of structural parts and mechanical parts, such as
oil, stair handrail, bicycle frame and steel construction with scaffold.
Manufacturing annular part with alloy seamless steel pipe, can improve the
utilization rate of materials, simplify the manufacturing process, material
saving and working hours, such as rolling bearing ring, Jack and so on, has been
widely used in steel pipe manufacturing. Alloy seamless steel pipe or a variety
of conventional weapons indispensable material, gun barrels are made of steel.
In addition, the ring cross section is subjected to internal or external radial
pressure, the stress is more uniform, therefore, the vast majority of alloy
seamless steel pipe is a circular tube.
Manufacturing process
Hot-rolled (extrusion seamless pipe): billet, heating, perforation, three roll cross rolling, rolling or extrusion, tube to tube diameter (or reducing) - cooling - tube, straightening, pressure test (or testing), marking and warehousing.
Cold drawing (rolling) seamless steel pipe: round tube to heating to perforation, annealing, pickling, leading to oil (copper), multi pass drawing (Leng Zha), the blank pipe, heat treatment, straightening, pressure test (testing), marking and warehousing.
classification
Structure with seamless steel pipe: mainly used for general structure and mechanical structure. The representative of material (grade 20, No. 45): carbon steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo etc..
Seamless steel pipe for conveying fluid: mainly used for conveying fluid pipe on engineering and large equipment. On behalf of the material (grade) for 20, Q345, etc..
Seamless steel tubes for low and medium pressure boilers: mainly used for the transportation of low and medium pressure fluids in industrial boilers and life boilers. Representative material for 10, 20 steel.
Seamless steel tube for high pressure boiler: mainly used in power plant and nuclear power station boiler high temperature, high pressure transmission fluid collection tank and pipeline. Representative material for 20G, 12Cr1MoVG, 15CrMoG, etc..
Carbon steel and carbon manganese steel seamless steel pipe ship: mainly used for marine boiler and Superheater I, II pressure pipe etc.. Representative material for 360, 410, 460 steel grade, etc..
Seamless steel tubes for high pressure chemical fertilizer equipment: mainly used for conveying high temperature and high pressure fluid pipelines on fertilizer equipment. Representative material is 20, 16Mn, 12CrMo, 12Cr2Mo, etc..
Seamless steel tubes for petroleum cracking: boilers, heat exchangers, and their transmission fluid pipelines, which are mainly used in petroleum refineries. Its representative material is 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc..
Seamless steel pipe for gas cylinders: mainly used for the production of a variety of gas, hydraulic cylinders. Its representative material for 37Mn, 34Mn2V, 35CrMo, etc..
Hot rolled seamless steel tube for hydraulic support: mainly used for making coal mine hydraulic support and cylinder, column, as well as other hydraulic cylinder, column. Its representative material is 20, 45, 27SiMn, etc..
High pressure seamless steel pipe for diesel engine, mainly used for high pressure oil pipe of diesel engine injection system. The steel pipe is generally cold drawn tube, the representative of 20A.
Cold drawn or cold rolled precision seamless steel pipe: mainly used for mechanical structure, carbon pressure equipment, the requirements of high dimensional accuracy and surface finish of the steel tube. Its representative material 20, 45 steel, etc..
