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Grade A878
Corresponding Standard ASTM A878/A878M-2019
Steel Wire, Modified Chromium Vanadium Valve Spring Quality
Classification Alloy Steel
A878 Chemical Element Composition Content (%)
Component C Si Mn P S Cr V
Minimum Value 0.6 0.15 0.5 - - 0.35 0.1
Maximum Value 0.75 0.3 0.9 0.025 0.025 0.6 0.25
A878 Mechanical Properties
Tensile Strength
σb
Mpa 		Reduction of Area
ψ
%
0.5 2000~2170
1.0 1930~2100
1.5 1830~2000
2.0 1760~1900
3.0 1660~1800 ≥45
3.75 1620~1760 ≥40
4.5 1590~1730 ≥40
5.0 1550~1690 ≥40
5.7 1520~1660 ≥40
6.3 1480~1620 ≥40
7.9 1450~1590 ≥40
9.5 1410~1550 ≥40

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