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A 540 Grade B21 Class 4

Favorite Datasheet
A 240 S21400 A 580 S21400
#214

Description

USA SAE A 540/A 540M (2011), A 540 Grade B21 Class 4 Specialsteel Alloy-Steel Bolting Materials for Special Applications and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.

Datasheet for: Steel Grades:Specialsteel: A 540 Grade B21 Class 4
Category Class Grade Type Standard Country Application
Steel GradesSpecialsteel A 540 Grade B21 Class 4 Precipitation-Hardening SAE USA Alloy-Steel Bolting Materials for Special Applications

Chemical composition(mass fraction)(wt.%) of the A 540 Grade B21 Class 4

C Si Mn P S Ni Cr Al Cu Ti Fe N Mo B Zr
≤0.05 ≤0.20 ≤0.50 ≤ ≥ ≤ ≥ ≤remaining 15.00 -17.00 4.00 -5.00 ≤ ≥ ≤0.50 2.00 -4.00 ≤ ≥ ≤0.50 ≤0.006 ≤0.05

Mechanical Properties of steel grade A 540 Grade B21 Class 4

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)
472 (≥) 952 (≥) 33 31 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 233

Physical Properties of steel grade A 540 Grade B21 Class 4

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
32 - -     0.34 -  
695 341 - 11.3 242   -  
968 - 22 22.2   411 442

Heat Treatment of steel grade A 540 Grade B21 Class 4

Heat treated : 1655°C - 1761°C

Technological Curves of steel grade A 540 Grade B21 Class 4

Cross Reference Table (Equivalent Grade) of A 540 Grade B21 Class 4

Grade Standard Country Application
S21400
S21460
214
214
S21400
S21400
UNS G12144
UNS G12144
UNS W21418
UNS W74214
UNS K21451
UNS K21450
UNS K21485
UNS W82141
SS14:2140
SS14:2140
SS14:2140

Relevant standard of A 540 Grade B21 Class 4

A 540/A 540M (2011) Alloy-Steel Bolting Materials for Special Applications A-540-A-540M-(2011).pdf
A 240 S21400 A 580 S21400
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Jiangyou Longhai Special Steel Co.,Ltd.

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