58 55пп - GOST 1050-1988

Grade	58
Other Names
Corresponding Standard	GOST 1050-1988 Sized Bars Made Of High-quality Structural Carbon Steel with A Special Surface Finish
Classification	Carbon Steel

58 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	As
Minimum Value	0.55	0.1	-	-	-	-	-	-	-
Maximum Value	0.63	0.3	0.2	0.035	0.04	0.15	0.3	0.3	0.08

① Identification numbers for steels (depending on degree of deoxidation) shall be used: kn is for rimmed steel; nc is for semi-killed steel; and identification numbers without letters are for killed steels.
②The nitrogen fraction of total mass in basic oxygen steel shall not exceed 0.006 % for light-gage rolled products and strips and 0.008 % for other types of rolled products.

58 Mechanical Properties

product	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
Rolled product	≥600	≥315	≥12	≥28

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