45Mn2 - GB /T 17107-1997

Grade	45Mn2
Corresponding Standard	GB /T 17107-1997 Structural Steel Grades And Mechanical Property For Forgings
Classification	Alloy Steel

45Mn2 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.42	0.17	1.4	-	-	-	-	-
Maximum Value	0.49	0.37	1.8	0.035	0.035	0.3	0.3	0.3

• High-quality steel——P≤0.035；S≤0.035；Cu≤0.3；Cr≤0.3；Ni≤0.3
• Extra-quality steel （Suffix A）——P≤0.025；S≤0.025；Cu≤0.25；Cr≤0.3；Ni≤0.3
• Special High-Quality Steel (Suffix E)——P≤0.025；S≤0.015；Cu≤0.25；Cr≤0.3；Ni≤0.3

45Mn2 Mechanical Properties

diameter or thickness d mm	Mark	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
d≤100	Sample Direction: Longitudinal	Normalizing + tempering	≥690	≥355	≥16	≥38	187~241
100＜d≤300	Sample Direction: Longitudinal	Normalizing + tempering	≥670	≥335	≥15	≥35	187~241

• The forgings must be inspected for mechanical properties after performance heat treatment and before any surface treatment.
• After the samples are removed, no heat treatments that affect the mechanical properties or any processing that influences the test results shall be conducted.
• Mechanical property testing primarily evaluates the material\'s tensile strength, impact resistance, and hardness. When conducting tensile, impact, and hardness tests simultaneously, the hardness value is for reference only. Alternatively, one may choose to perform only one of the tensile, impact, or hardness tests.

Approximate Comparison Table structural alloy steel

China		Taiwan, China	Japan	South Korea	United States		Germany		France	Russia
GB	ISC	CNS	JIS	KS	ASTM/AISI	UNS	DIN EN/DIN	W-Nr.	NF EN/NF	GOST
45Mn2	A00452	SMn443	SMn443	SMn443	1345	G13450	46Mn7	1.0912	45M5	45Г2

45Mn2 Corresponding Standards(Same grade name, different standards)

1	GB /T 3077-1999
	45Mn2 A00452
2	GB /T 17107-1997
	45Mn2
3	GB /T 3077-2015
	45Mn2 A00452
4	GB /T 3078-2019
	45Mn2
5	GB /T 37601-2019
	45Mn2 A00452

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