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4340, DIN1.6580, 30CrNiMo8,SNCM431 Hardened Steel

4340, DIN1.6580, 30CrNiMo8,SNCM431 Hardened Steel

4340, DIN1.6580, 30CrNiMo8,SNCM431  Hardened Steel
CategoriesQuenched and Tempered Steel Bars
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Model4340, DIN1.6580, 30CrNiMo8,SNCM431
ProductHardened steel
Applicationhighly stressed components
Similar steel grades4340, DIN1.6580, 30CrNiMo8,SNCM431
FOB portshanghai
Terms of PaymentL/C, T/T
Update Time2019-01-21
Detail Information

Chemical Composition(%)

Steel GradeCMnSiPSCrNiMo
30CrNiMo80.26-0.340.50-0.800.40 max0.025 max0.035 max1.80-2.201.80-2.200.30-0.50
43400.38–0.430.60-0.800.15-0.350.035 max0.040 max0.70-0.901.65-2.000.20-0.30
SNCM4310.27-0.350.60-0.900.15-0.350.030 max0.030 max0.60-1.101.60-2.000.15-0.30

All Grades Comparison

Material no.DINBSASTM



Mechanical Properties(T=20°C if not differently stated)

Heat treatment stateDiameter(mm)Rm (Mpa)Rp0.2 (Mpa)Fracture elongation A5 (%)Notch impact energy ISO-V [J]Hardness (HB)
SOFT ANNEALED/844 min///250 max
ISOTHERMAL ANNEALED/615-815///183-242
QUENCHED AND TEMPERED16 max880-1080685 min16 min40 min289-347
QUENCHED AND TEMPERED16-40930-1080735 min16 min40 min275-318
QUENCHED AND TEMPERED40-100880-1030685 min17 min40 min261-303
QUENCHED AND TEMPERED100-250785-935635 min18 min35 min233-276
QUENCHED AND TEMPERED250-500735-885590 min16 min35 min218-262



Alloyed heat treatable steel with a typical tensile strength of 1100 -1300 N/mm². Used for highly stressed components, where the combination of high strength with tenaciousness is of utmost importance. High cold formability: Parts of different shape can be manufactured, a favorable fibering for stress, a very good surface condition and an high dimensional accuracy. When cold formed the smooth surface leads to an increased fatigue and vibratory strength.


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