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7Q

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6N 8Q
#7Q

Description

USA ASTM 7Q Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures and 7Q Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Special Alloy: 7Q
Category Type Steel Grade Standard Country Application
Steel GradesSpecial Alloy 7Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Gr 620
Gr 825
Grade21
Grade31
1A
2A,2Q
3A,3Q
4A,4Q
5N
6N

Chemical composition(mass fraction)(wt.%) of the 7Q

C(％) Si(％) Mn(％) P(％) S(％) Cr(％) Mo(％)
0.25-0.35 0.20-0.80 0.40-0.70 0.04 0.045 0.80-1.10 0.15-0.25

Mechanical Properties of steel grade 7Q

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)
824 (≥) 858 (≥) 13 32 31 Solution and Aging, Annealing, Ausaging, Q+T,etc 323

Physical Properties of steel grade 7Q

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
44 - -     0.33 -  
818 332 - 12.3 144   -  
688 - 41 14.2   332 342

Heat Treatment of steel grade 7Q

Heat treated : 1966°C - 1869°C

Technological Curves of steel grade 7Q

Cross Reference Table (Equivalent Grade) of 7Q

Grade Standard Country Application
ASTM 7Q AISI China
OL37q STAS/SR Romania Structural steel
OL37q STAS/SR Romania Alloy structural steel
7Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
7Q ASTM USA Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
6N 8Q
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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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