15Г - GOST 4543-1971

Grade	15Г
Corresponding Standard	GOST 4543-1971 ALLOYED CONSTRUCTION STEEL Specifications
Classification	Alloy Steel

15Г Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.12	0.17	0.7	-	-	-	-	-
Maximum Value	0.19	0.37	1	0.035	0.035	0.3	0.3	0.3

• The letter A at the end of the grade stands for “high quality steel”. Character III means “Extra high quality steel”. For example, quality steel -30XΓC; High quality steel -30XΓCA; Extra high quality steel -30X ΓC-Ⅲ and 30XΓCA-Ⅲ.

15Г Mechanical Properties

diameter(thickness) d(t) mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW
t≤25	Quenching + Tempering ≥410	Quenching + Tempering ≥245	Quenching + Tempering ≥26	HB ≤207

• d=circle diameter or quadrate side，unit mm
• Mechanical properties suitable for diameter or thickness less than or equal to 80mm, other sizes of mechanical properties requirements see the standard original.
• The impact test shall comply with GOST 9454-78.
• If the yield phenomenon is not obvious and the yield stress σT(i.e., σs) cannot be determined, the yield limit σ0.2(i.e., Rp0.2) is allowed.
• Allowable deviation of heat treatment temperature: quenching ±15°C; Low temperature tempering ±30°C; High temperature tempering ±50°C

1 Approximate Comparison Table

China		United States		Germany		France	Russia	Sweden	United Kingdom
GB	ISC	ASTM/AISI	UNS	DIN EN/DIN	W-Nr.	NF EN/NF	GOST	SS	BS EN/BS
15Mn	U21152	1016	G10160	15Mn3	1.0467	12M5	15г	1430	080A15

2 Approximate Comparison Table

China		Japan	United States	International Organization for Standardization	France	European Standard		Russia	United Kingdom
GB	ISC	JIS	ASTM/AISI	ISO	NF EN/NF	EN	Numerical Grade	GOST	BS EN/BS
15Mn (GB/T 699-2015)	U21152	SWRCH16K	1019 1016 (ASTM A29/A29M:2005)	CC15K (ISO 4954:1993)	XC12	C16E (EN 10083-1:1991+A1:1996) (EN 10084:1998)	1.1148	15Г	080A15 080A17

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