FUSHUN Metals

4340 DIN 1.6580 30CrNiMo8 SNCM431 Hardened Steel Round Bar

Group Quenched and Tempered Steel Bar
Min. Order 1 piece
Terms of Payment L/C, T/T
Update Time 2019-06-03
Item specifics
Diameter50-260mm
Delivery conditionharden
Surface conditionblack, bright
  • Description
  • Product review

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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