1045 Carbon Steel

 AISI 1045

		C				P	S
GB/T699-1999	AISI1045/S45C	0.42~0.50	Less than or equal to 0.25	0.50~0.80	Less than or equal to 0.25	Less than or equal to 0.035	Less than or equal to 0.035	0.17~0.37
		Greater than or equal to 600		Greater than or equal to 355		Greater than or equal to 16		Greater than or equal to 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.

	YB/T 094		JIS G4051
	SM45	1045	S45C
C	0.42-0.48	0.43-0.50	0.42-0.48
	0.17-0.37		0.15-0.35
	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.

		200	300	400	500	550	600
	57	55	50	41	33	26	22

Mechanical properties (GB/T 699-1999)
			25
		ºC	850
		ºC	840
		ºC	600
			Greater than or equal to 600
			Greater than or equal to 355
			Greater than or equal to 16
			Greater than or equal to 40
			Greater than or equal to 39
			Less than or equal to 229
			Less than or equal to 197