1045 Carbon Steel

 AISI 1045 carbon steel with details in under sheet :

Standard No.	Alloy No.	Chemical compositions(%)
		C	Cr	Mn	Ni	P	S	Si
GB/T699-1999	AISI1045/S45C	0.42~0.50	≤0.25	0.50~0.80	≤0.25	≤0.035	≤0.035	0.17~0.37
	Mechanical Property	Tensile Strength(Mpa)		Yeild Strength(Mpa)		Elongation(%)		Contraction of area Z(%)
		≥600		≥355		≥16		≥40

The correlation between properties and parameters-S45C (JIS)-SAE1045(Aisi)-SM45 of 1045 steel(45 steel) was studied:
1045 carbon steel is a carbon structural steel with 0.45% carboncontent. It is characterized by low price, good cutting performance, high hardness after quenching, good strength, toughness and wear resistance after quenching and temperingtreatment, is widely used in manufacturing structural partsand low-grade plastic mold. "45 steel" is a popular name, thesymbol is generally recorded as"45 #". In fact GB standardsteel number is"45", it is not a sequential number, read as"45steel" is not very accurate. Ingredient code 45 steels of similar designation are S45C (JIS) and 1045(Aisi) . In addition, ourcountry metallurgical technology standard has SM45 brandnumber to express the plastic mold use specially. Comparedwith 45 steel, SM45 has lower phosphorus and sulfur contentand better steel purity.

Standards	YB/T 094	AISI	JIS G4051
Alloy No.	SM45	1045	S45C
C	0.42-0.48	0.43-0.50	0.42-0.48
Si	0.17-0.37		0.15-0.35
Mn	0.50-0.80	0.60-0.90	0.60-0.90
P	<0.030	<0.030	<0.030
S	<0.035	<0.035	<0.035

Recommended process specification for heat treatment andhardness: quenching temperature 820 - 860" C, water-oroil-cooled, hardness 250 HRC. Recommended tempering pro-cess specifcation: tempering temperature is 500 - 560" C, aircooling, hardness is 25 - 33HRC. Tempering in this temperature range is the tempering treatment, Quenching and tempering make the strength, plasticity and toughness of 45 steelget a good balance, the comprehensive performance is good,can adapt to the alternating load environment. After quench-ing and tempering, the surface hardness of 1045 carbon steel is low anddoes not wear well. So commonly used quenching and tempering + surface quenching to improve the surface hardnessof parts.

Tempering temperature	After quenching	Unit centigrade
		200	300	400	500	550	600
Hardness HRC	57	55	50	41	33	26	22

Mechanical properties (GB/T 699-1999)
Sample size		mm	25
Heat treatments recommended	Normalizing	ºC	850
	Quenching	ºC	840
	Tempering	ºC	600
Mechanical properties	Tensile strongth	Mpa	≥600
	Strong yield	Mpa	≥355
	Elongation	Mpa	≥16
	Section shrinkago	Mpa	≥40
	Impact	Mpa	≥39
Hardness of delivery		HB	≤229
		HB	≤197