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4340 DIN 1.6580 30CrNiMo8 SNCM431 Hardened Steel Round Bar

4340 DIN 1.6580 30CrNiMo8 SNCM431 Hardened Steel Round Bar

4340 DIN 1.6580 30CrNiMo8 SNCM431 Hardened Steel Round Bar
CategoriesQuenched and Tempered Steel Bars
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Brandfushun
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 Time2019-03-19
Detail Information

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 favorablefibering 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.

 

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

 

All Grades Comparison

Material no.

DIN

BS

ASTM

1.658

30CrNiMo8

823M30

4340

AFNOR

ISO

ГOCT

JIS

30CND8

31CrNiMo8

3KH3M3F

SNCM431

 

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

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