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STM-R780

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China 宝钢Q/BQB STM-R780 钻探用无缝钢管 and Mechanical Properties, Chemical Element, Cross Reference.

Datasheet for: Metals: STM-R780 / STM-R780
Category Grade Standard Region/Area Standard Content
Metals STM-R780 Q/BQB 230 China 钻探用无缝钢管

Chemical composition(mass fraction)(wt.%) of the STM-R780

Element Min Max Similar
C 0.3800 0.4500 -
Si 0.1500 0.3500 -
Mn 1.5500 1.8500 -
Mo 0.1500 0.2500 -
P - 0.0250 -
S - 0.0200 -
Cu - 0.2000 -
Cr - 0.3000 -
Ni - 0.3000 -
Ni - 0.3000 -
Cr - 0.3000 -
Cu - 0.2000 -
S - 0.0200 -
P - 0.0250 -
Mo 0.1500 0.2500 -
Mn 1.5500 1.8500 -
Si 0.1500 0.3500 -
C 0.3800 0.4500 -

Mechanical Properties of steel grade STM-R780

Yield
Rp0.2 (MPa)		 Tensile
Rm (MPa)		 Impact
KV/Ku (J)		 Elongation
A (%)		 Reduction in cross section on fracture
Z (%)		 As-Heat-Treated Condition Brinell hardness (HBW)
247 (≥) 626 (≥) 14 14 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 434

Physical Properties of steel grade STM-R780

Temperature
(°C)		 Modulus of elasticity
(GPa)		 Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and Thermal conductivity
(W/m·°C)		 Specific thermal capacity
(J/kg·°C)		 Specific electrical resistivity
(Ω mm²/m)		 Density
(kg/dm³)		 Poisson’s coefficient, ν
11 - -     0.34 -  
691 366 - 24.3 341   -  
411 - 22 41.2   144 413

Heat Treatment of steel grade STM-R780

Heat treated : 1814°C - 1538°C

Technological Curves of steel grade STM-R780

Cross Reference Table (Equivalent Grade) of STM-R780

Grade Standard Country Application
ASTM 5140
AISI 201
AISI 202
1.2767
17-4PH
AISI 1052
AISI 416Se
AISI 1330
AISI 205 Stainless Steel
AISI A10
AISI A2
AISI A3
AISI A4
1.0036
1.0037
SAE J403
UNS G10100
AMS 4924
ASTM A36
Electrode 100S-1
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Jiangyou Longhai Special Steel Co.,Ltd.
Jiangyou Longhai Special Steel Co.,Ltd.

Our main peoducts of steel are many kinds of special steel, like tool steel, mould steel, alloy steel, alloy constructural steel, heat-resistant steel, high speed tool steel,spring steel and bearing steel , stainless steel and so on, which have formed 12 series and more than 350 varieties with n...

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