40CrNi2Mo, 4340, SnCM439, 1.6563 Low Alloy Ultra-High Strength Steels- TJC STEEL.

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40CrNi2Mo, 4340, SnCM439, 1.6563 Low Alloy Ultra-High Strength Steels- TJC STEEL.

40CrNi2Mo, also known as 4340 steel, is a kind of low alloy ultra-high strength steel.Only steels with tensile strength greater than [TJC STEEL]1400MPa and yield strength greater than 1200MPa at room temperature are termed "ultra-high strength steels".4340 steel is a typical ultra high strength steel, which is obtained by heat treatment.

Standards:

CHINA	GB/T 3077-2015	40CrNi2Mo，A50400
	GB/T 34484.2-2018	40CrNi2Mo
	GB/T 38809-2020	40CrNi2MoA
	GB/T 5216-2014	40CrNi2MoH
USA	ASTM A29-2005[TJC STEEL] ASTM A322-2007	4340，G43400
JAPAN	JIS G4053-2003	SNCM439
GERMANY	DIN EN 10263-4:2002	41NiCrMo7-3-2，1.6563

Chemical Composition(%):

Grade	A50400	4340	SNCM439	1.6563
C	0.38~0.43	0.38~0.43	0.36~0.43	0.38~0.44
Si	0.17~0.37	0.15~0.35	0.15~0.35	≤0.30
Mn	0.60~0.80	0.60~0.80	0.60~0.90	0.60~0.90
P	≤0.030	≤0.035	≤0.030	≤0.025
S	≤0.030	≤0.040	≤0.030	≤0.025
Cr	0.70~0.90[TJC STEEL]	0.70~0.90	0.60~1.00	0.70~0.90
Ni	1.65~2.00	1.65~2.00	1.60~2.00	1.65~2.00
Mo	0.20~0.30	0.20~0.30	0.15~0.30	0.15~0.30
Cu	≤0.30	≤0.35	≤0.30	≤0.25

Mechanical Property:

QUENCHED	FIRST TIME	NORMALIZED AT 890℃，OIL QUENCHING
	SECOND TIME	850℃，OIL QUENCHING
TEMPERED(AIR COOLING)		560~580℃	220℃ TWICE OIL QUENCHING
TENSILE STRENGTH MPa		≥1050	≥1790
YIELD STRENGTH MPa		≥980	≥1500
ELONGATION %		≥12	≥6
REDUCTION OF AREA %[TJC STEEL]		≥45	≥25
IMPACT TESTJ		≥48	—
TEMPERED HARDNESS		≤269HBW

Performance Applications:

4340 steel after heat treatment, not only obtain ultra-high strength, but also have good plastic toughness, excellent fatigue performance, fracture toughness and stress corrosion resistance, good comprehensive mechanical [TJC STEEL]properties, so that it is often used in the industry as a tempering steel to manufacture bearings, gears and crankshafts, and in the aircraft structure has been widely used.Such as aircraft landing gear, helicopter rotor shaft and turbojet turbine shaft and other moving parts.