38Х2Н2МА 38ХНМА - GOST 4543-1971

Grade	38Х2Н2МА
Old Grade
Corresponding Standard	GOST 4543-1971 ALLOYED CONSTRUCTION STEEL Specifications
Classification	Alloy Steel

38Х2Н2МА Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo
Minimum Value	0.33	0.17	0.25	-	-	1.3	1.3	-	0.2
Maximum Value	0.4	0.37	0.5	0.035	0.035	1.7	1.7	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.

38Х2Н2МА Mechanical Properties

diameter(thickness) d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d≥25	Quenching 870°C oil cooling, Tempering 580°C oil or air cooling	≥1080	≥930	≥12	≥50		KCU: ≥78J/cm2
d≥5	Annealing					Indentation diameter ≥ 3.7mm ≤269

• 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

Japan	South Korea	United States	Germany		France	European Standard		Russia	Sweden	United Kingdom
JIS	KS	ASTM/AISI	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
SNCM447	SNCM447	4330 4337 4340 G43376 G43400 G43499	34CrNiMo6 35CrNiMo6 GS-34CrNiMo6	1.6582	34CrNiMo6 34CrNiMo8 35CND6	34CrNiMo6 35CrNiMo6KD	1.6582	38Х2Н2МА	2541	34CrNiMo6 816M40 817M40

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