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SNCM431 4340 DIN1.6580 30CrNiMo8 Hardened Steel

SNCM431 4340 DIN1.6580 30CrNiMo8 Hardened Steel 30crnimo8 SNCM431 4340 DIN1.6580 30CrNiMo8 Hardened Steel SNCM431 4340 DIN1

SNCM431 4340 DIN1.6580 30CrNiMo8 Hardened Steel

Applications

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.

All Grades Comparison

Material no. DIN BS ASTM
1.6580 30CrNiMo8 823M30 4340
AFNOR ISO ГOCT JIS
30CND8 31CrNiMo8 3KH3M3F SNCM431

Chemical Composition(%)

Steel Grade C Mn Si P S Cr Ni Mo
30CrNiMo8 0.26-0.34 0.50-0.80 0.40 max 0.025 max 0.035 max 1.80-2.20 1.80-2.20 0.30-0.50
4340 0.38–0.43 0.60-0.80 0.15-0.35 0.035 max 0.040 max 0.70-0.90 1.65-2.00 0.20-0.30
SNCM431 0.27-0.35 0.60-0.90 0.15-0.35 0.030 max 0.030 max 0.60-1.10 1.60-2.00 0.15-0.30

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

Heat treatment state Diameter(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 TEMPERED 16 max 880-1080 685 min 16 min 40 min 289-347
QUENCHED AND TEMPERED 16-40 930-1080 735 min 16 min 40 min 275-318
QUENCHED AND TEMPERED 40-100 880-1030 685 min 17 min 40 min 261-303
QUENCHED AND TEMPERED 100-250 785-935 635 min 18 min 35 min 233-276
QUENCHED AND TEMPERED 250-500 735-885 590 min 16 min 35 min 218-262

HEAT TREATMENT AND HOT PLASTIC DEFORMATION TEMPERATURES

TEMPERATURE ° C Cooling Medium
Hot plastic deformation 850-1100 /
Normalizing 850-880 air
Soft Annealing 650-690 air
Quenching 830-860 oil
Tempering 540-660 air