55Si2MnCr A24563 - GB /T 1222-2025

55Si2MnCr Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.52	1.6	0.7	-	-	0.2	-	-
Maximum Value	0.6	2	1	0.025	0.02	0.45	0.35	0.2

55Si2MnCr Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
Quenched in oil at 860±20°C and tempered at 450±50°C	≥1500	ReL ≥1350	≥6	≥25

Approximate Comparison Table Spring Steel 1

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