30ХМ - GOST 4543-1971

Grade	30ХМ
Corresponding Standard	GOST 4543-1971 Alloyed Construction Steel Specifications
Classification	Alloy Steel
Properties	High Hardenability

30ХМ Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.26	0.17	0.4	-	-	0.8	-	-	0.15
Maximum Value	0.34	0.37	0.7	0.035	0.035	1.1	0.3	0.3	0.25

• 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.

30ХМ Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
Quenching and Tempering	≥930	≥736	≥11	≥45	Impact energy per unit area KCU: ≥78J/cm²

• 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

Approximate Comparison Table Structural Alloy Steel

China		Japan	United States	Germany		France	European Standard		Russia	Sweden
YB	ISC	JIS	ASTM	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	SS₁₄
25CrMo	A30252	SCM430	4130	25CrMo4	1.7218	25CD4	25CrMo4	1.7218	30ХМ	2225

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!