Seamless steel pipe for structure Seamless steel pipe Features

Chromium-molybdenum steel, also known as medium temperature hydrogen resistant steel, is an alloy of chromium (Cr), molybdenum (Mo), iron (Fe), carbon (C). Because of its special high quality performance, it is often used to manufacture some high temperature and high pressure resistant valves and pressure vessels, such as chromium-molybdenum steel safety valve, chromium-molybdenum steel gate valve, screwdriver head, bicycle and so on

Seamless steel pipe for structure-Seamless steel pipe Price in China ,Manufacturer of Seamless steel pipe for structure-Seamless steel pipe

Heat resistance
The addition of chromium, molybdenum, rocky and other elements effectively improves the high-temperature oxidation resistance and high-temperature strength of steel, and its mechanism is as follows: Chromium mainly exists in the cementite (Fe3C), dissolved in the cementite of chromium, improve the decomposition temperature of carbide, prevent the occurrence of graphitization phenomenon, and improve the heat resistance of steel. Molybdenum can strengthen ferrite by solution and improve the stability of carbides, so it is beneficial to improve the high temperature strength of steel. The addition of vanadium can keep the fine grain structure of steel at higher temperature and improve the thermal stability and strength of steel.
Hydrogen corrosion resistance
Chromium, molybdenum and other elements improve the stability of carbides, prevent the decomposition of carbides, reduce the chance of carbides and precipitated carbon and hydrogen reaction to form methane. The addition of vanadium can keep the fine grain structure of steel at higher temperature, which greatly increases the stability of steel to hydrogen at high temperature and high pressure.
Temper brittleness
The temper brittleness of chromium-molybdenum steel refers to the phenomenon that the impact toughness will decrease when the steel is operated in the temperature range of 370℃ to 595℃ for a long time. Our usual hydrogen devices operate in this temperature range for a long time. According to the experimental results, the cr-Mo steel with Cr content of 2%-3% has the most serious tendency of embrittlement. P, Sb, Sn, As, Si, Mn and other elements have a great influence on the temper brittleness. Embrittlement is reversible and severely embrittlement materials can be deemable by proper heat treatment.
Brittle hard tendency is large, easy to produce delayed crack
Due to the addition of chromium, molybdenum, vanadium and other alloying elements, the critical cooling rate of steel is reduced and the stability of undercooled austenite is improved. If the welding cooling rate is faster, it is not easy to change from austenite to pearlite in the heat affected zone, but to change to martensite and form hardened structure at lower temperature. Under the combined action of complex residual stress and diffused hydrogen, hydrogen-induced delayed cracks can easily occur in the hardened structure of weld zone and heat-affected zone.

Equivalent Material of Seamless steel pipe for structure Seamless steel pipe

Standard Specification Of Seamless steel pipe for structure Seamless steel pipe

Specifications and thickness		Specifications and thickness		Specifications and thickness		Specifications and thickness
6*1-2		48*3-16		133*4.5-50		406*12-200
7*1-2.5		51*3-16		140*4.5-50		426*12-200
8*1-3		54*3-18		146*4.5-50		450*12-200
9*1.5-3		57*3-20		152*5-50		457*12-200
10*1.5-3.5		60*3-22		159*5-60		480*12-200
12*1.5-4		63.5*3-25		168*5-60		500*16-200
14*1.5-4		68*3-25		180*5-70		508*16-200
16*2-5		70*3-30		194*6-80		510*16-200
18*2-6		73*3-30		203*6-80		530*16-200
20*2-6		76*3.5-32		219*6-80		560*18-200
22*2-6		80*3.5-32		232*6-80		580*20-260
24*2-6		83*3.5-32		245*6-80		600*20-260
25*2-6		85*3.5-35		252*6-80		610*20*260
27*2.5-8		89*3.5-35		273*6-100		630*20-260
28*2.5-8.5		90*4-35		299*8-100		650*20-260
30*3-9		95*4-40		325*8-100		660*30-300
32*3-9		102*4-40		351*8-100		680*30-300
34*3-10		108*4-40		356*8-110		720*30-350
36*3-10		114*4-40		377*8-110		750*30-350
40*3-12		121*4-40		380*8-110		780*40-350
42*3-12		125*4-40		400*10-150		800*40-350
45*3-15		127*4-40		402*10-150		820*40-350

Seamless steel pipe for structure Seamless steel pipe function

1. Good quenching performance, can be deep quenching, rather than the surface quenching of the anti-saw lock on the market
2.  Less tendency to temper brittleness
3.  High temperature processing, beautiful after processing
4.  Good fusion
5.  The impact absorption performance is good, the hammer will have a sense of rebound, can not be violent damage

Price Range Of Seamless steel pipe for structure Seamless steel pipe

Price List					FOB Shanghai Per Unit (USD)
Seamless steel pipe for structure-1CrMo					$700-$1000.00