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8Q

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7Q 9Q
#8Q

Description

USA ASTM 8Q Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures and 8Q Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: 8Q
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy 8Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Gr 825
Grade21
Grade31
1A
2A,2Q
3A,3Q
4A,4Q
5N
6N
7Q

Chemical composition(mass fraction)(wt.%) of the 8Q

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Mo(％)
0.35-0.45 0.20-0.80 0.70-1.00 0.04 0.045 0.80-1.10 0.15-0.25

Mechanical Properties of steel grade 8Q

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)
994 (≥) 724 (≥) 33 33 41 Solution and Aging, Annealing, Ausaging, Q+T,etc 421

Physical Properties of steel grade 8Q

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
13 - -     0.24 -  
467 615 - 32.3 423   -  
312 - 24 44.2   314 333

Heat Treatment of steel grade 8Q

Heat treated : 1496°C - 1178°C

Technological Curves of steel grade 8Q

Cross Reference Table (Equivalent Grade) of 8Q

Grade Standard Country Application
ASTM 8Q AISI USA
8Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
8Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
7Q 9Q
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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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