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M-252

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SA-193 Grade B8M2 Class 2B A 646 Grade Marage 250
#M-252

Description

USA UNS SAE J 467 (1968), M-252 Specialsteel Special Purpose Alloys ("Superalloys") and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: M-252
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel M-252 Precipitation-Hardening UNS USA Special Purpose Alloys ("Superalloys")

Chemical composition(mass fraction)(wt.%) of the M-252

C Si Mn Ni Cr Al Cu Ti Fe Mo Co B
≤0.15 ≤0.50 ≤0.50 ≤remaining ≤20.00 ≤1.00 ≤ ≥ ≤2.60 ≤ ≥ ≤10.00 ≤10.00 ≤0.005

Mechanical Properties of steel grade M-252

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)
747 (≥) 681 (≥) 41 24 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 143

Physical Properties of steel grade M-252

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
22 - -     0.23 -  
384 819 - 33.3 223   -  
994 - 12 12.2   224 343

Heat Treatment of steel grade M-252

Heat treated : 1592°C - 1229°C

Technological Curves of steel grade M-252

Cross Reference Table (Equivalent Grade) of M-252

Grade Standard Country Application
M-252

Relevant standard of M-252

SAE J 467 (1968) Special Purpose Alloys ("Superalloys") SAE-J-467-(1968).pdf
SA-193 Grade B8M2 Class 2B A 646 Grade Marage 250
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