28SiMnB A76282 - GB /T 1222-2025

28SiMnB Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	B
Minimum Value	0.24	0.6	1.2	-	-	-	-	-	0.0008
Maximum Value	0.32	1	1.6	0.025	0.02	0.25	0.35	0.2	0.0035

28SiMnB 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 water or oil at 900±20°C and tempered at 320±30°C	≥1275	ReL ≥1180	≥5	≥25

28SiMnB Corresponding Standards(Same grade name, different standards)

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