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45# High Guality Alloy Steel

Steel	A		B		C		D		DS
Steel	Fine Lines	Thick Lines	Fine Lines	Thick Lines	Fine Lines	Thick Lines	Fine Lines	Thick Lines	DS
High Quality Steel	≤3.0	≤2.5	≤3.0	≤2.0	≤2.0	≤1.5	≤2.0	≤1.5	/
Super Grade Steel	≤2.5	≤2.0	≤2.5	≤1.5	≤1.5	≤1.0	≤1.5	≤1.0	≤2.0
If the buyer has different level requirements or has the content of sulfur (S), the qualified level will be negotiated and determined by both supply and demand parties

Name	Standard
Name	Standard or Agreement	Brand	ASME/ ASTM	JIS	DIN	EN
Alloy Structural Steel	GB/T 3077-1999	20Mn2	1524	SMn420	20Mn5	BS 150M19
		35Mn2	1335	SMn433	36Mn5	/
		27SiMn	/	/	/	/
		20Cr	5120	SCr420	20Cr4	DIN 20Cr4
		40Cr	5140	SCr440	41Cr4	EN 41Cr4
		30CrMo	4130	SCM430	30Cr4	EN 25CrMo4
		35CrMo	4135	SCM435	34CrMo4	EN 34CrMo4
		42CrMo	4140	SCM440	42CrMo4	EN 42CrMo4
		38CrMoAl	/	SACM645	41CrAlMo7	BS 905M39
		40CrNiMoA	/	/	/	/
		20CrMn	/	/	20MnCr5	DIN 20MnCr5
		20CrMnTi	/	/	/	/

Applicable Scope

This kind of steel, has the suitable hardenability, the suitable metal heat treatment, the microstructure of sorbite, bainite or very fine pearlite uniform, so it has high tensile strength and yield ratio (usually around 0.85), toughness and high fatigue strength and toughness. Brittle transition temperature is low, can be used in the manufacture of machine parts of larger section size.

Chemical Composition

C :0.38~0.45%

Si:0.17~0.37%

Mn:0.50~0.80%

S :Allowable residual content≤0.035%

P :Allowable residual content≤0.035%

Cr:0.90~1.20%

Ni:Allowable residual content≤0.30%

Cu:Allowable residual content≤0.30%

Mo:0.15~0.25%

Mechanical Property

The ultimate tensile strength of B (MPa): 1080 (110)
Yield strength s (MPa): 930 (95)
5 elongation (%): 12
Section shrinkage (%): 45 PSI
The impact of Akv (J): 63
The impact toughness value of alpha kV (J/cm2): 78 (8)
Hardness: 217HB

Sample size: sample blank size is 25mm