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Grade A877 Grade B
Corresponding Standard ASTM A877/A877M-2017
Steel Wire, Chromium-Silicon Alloys, Chrome-Silicon-Vanadium Alloy Valve Spring Quality
Classification Alloy Steel
A877 Grade B Chemical Element Composition Content (%)
Component C Si Mn P S Cr V
Minimum Value 0.55 1.2 0.5 - - 0.5 0.08
Maximum Value 0.7 1.65 0.8 0.025 0.025 0.8 0.25
A877 Grade B Mechanical Properties
Tensile Strength
σb
Mpa 		Reduction of Area
ψ
%
0.5 2200~2380
1.0 2170~2340
1.5 2140~2300
2.0 2100~2240 ≥40
3.0 2070~2200 ≥40
3.75 2030~2170 ≥35
4.5 2000~2140 ≥35
5.0 1970~2100 ≥35
5.7 1930~2070 ≥35
6.3 1900~2030 ≥35
7.9 1860~2000 ≥35
9.5 1830~1970 ≥35

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