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Description

USA SAE SAE J 437 (1970), SAE J 438 (1970), W7 Tool Die Steels Tool and die steels and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Tool Die Steels: W7
Category Class Grade Standard Country Application
Steel GradesTool Die Steels W7 SAE USA Tool and die steels

Chemical composition(mass fraction)(wt.%) of the W7

C Si Mn Cr V
0.95 -1.10 0.10 -0.40 0.10 -0.40 0.35 -0.50 0.15 -0.25

Mechanical Properties of steel grade W7

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)
572 (≥) 491 (≥) 42 32 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 322

Physical Properties of steel grade W7

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
12 - -     0.33 -  
518 784 - 32.3 211   -  
554 - 43 22.2   213 123

Heat Treatment of steel grade W7

Heat treated : 1685°C - 1393°C

Technological Curves of steel grade W7

Cross Reference Table (Equivalent Grade) of W7

Relevant standard of W7

SAE J 437 (1970) Selection and heat treatment of tool and die steels SAE-J-437-(1970).pdf
SAE J 438 (1970) Tool and die steels SAE-J-438-(1970).pdf

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