ASTM A213 T91 Alloy Steel Pipe , Painting Black Steel Pipes DIN17175-79

ASTM A213 T91 Alloy Steel Pipe, Size 3IN, Cold Drawn, Boiler Pipe, Black Painting

Introduction
Alloy seamless steel pipe is a kind of seamless steel pipe, its performance is much higher than the general seamless steel pipe, because this kind of steel pipe contains Cr comparison
Many, its high temperature resistance, low temperature resistance, corrosion resistance is other seamless steel pipe can not compare, so alloy pipe in petroleum, chemical, electric power, boiler and other industries are more widely used.
Alloy seamless steel pipe contains elements such as silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, rare earth, etc.
Description

Alloy pipes have hollow sections and are used in large quantities to transport fluids, such as oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe has light weight when bending and torsion strength is the same. Alloy steel pipe is an economical section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile drive shaft, bicycle frame and steel scaffolding used in construction. Making ring parts with alloy steel pipe can improve the utilization ratio of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing ring, Jack sleeve and so on. At present, steel pipe has been widely used to manufacture. Alloy steel pipe is also an indispensable material for all kinds of conventional weapons, barrel, barrel and so on must be made of steel pipe. Alloy steel pipe can be divided into circular pipe and special-shaped pipe according to the shape of cross-sectional area. Because the circular area is the largest under the condition of equal circumference, more fluid can be transported by circular pipe. In addition, the ring section under internal or external radial pressure, the force is more uniform, therefore, most of the steel pipe is a circular pipe.

Folding 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.
Folding 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.

Folding Material
12Cr1MoV,P22(10CrMo910) T91, P91, P9, T9, WB36, Cr5Mo (P5, STFA25, T5,)15CrMo (P11, P 12, STFA22),13CrMo44, Cr5Mo ,15CrMo ,25CrMo ,30CrMo ,40CrMo.
Folding implementation standards
DIN17175-79,JISG3467-88,JISG3458-88,GB5310-2008,GB9948-2006,ASTMA335/A335m,ASTMA213/A213m.