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B 275 GR20A

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A 403 CR20CB B 275 GR20B
#R-20

Description

USA SAE B 275 (2005), B 275 GR20A Specialsteel Standard Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: B 275 GR20A
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel B 275 GR20A Precipitation-Hardening SAE USA Standard Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought

Chemical composition(mass fraction)(wt.%) of the B 275 GR20A

C Si Mn Cr Ni Mo Co W Al Cu Ti Fe Nb
≤0.12 ≤0.30 ≤0.80 ≤19.00 ≤14.00 ≤ ≥ ≤ ≥ ≤ ≥ ≤ ≥ ≤ ≥ ≤ ≥ ≤remaining ≤1.60

Mechanical Properties of steel grade B 275 GR20A

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)
945 (≥) 893 (≥) 41 24 11 Solution and Aging, Annealing, Ausaging, Q+T,etc 311

Physical Properties of steel grade B 275 GR20A

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 - -     0.31 -  
379 144 - 11.3 244   -  
491 - 21 34.2   313 424

Heat Treatment of steel grade B 275 GR20A

Heat treated : 1581°C - 1899°C

Technological Curves of steel grade B 275 GR20A

Cross Reference Table (Equivalent Grade) of B 275 GR20A

Grade Standard Country Application
R-20
25Cr-20Ni
25Cr-20Ni+
29Cr-20Ni
25Cr-20Ni
25Cr-20Ni
25Cr-20Ni
25Cr-20Ni
25Cr-20Ni
29Cr-20Ni
29Cr-20Ni
29Cr-20Ni

Relevant standard of B 275 GR20A

B 275 (2005) Standard Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought B-275-(2005).pdf
A 403 CR20CB B 275 GR20B
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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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