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Home » Stainless Steel » Product introduction

708M40

  • Numbers: 20101221029
  • Model: 708M40, 708M40T, BS970
  • Producers: China
  • Update time: 2010.12.21
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Product Description:

708M40  is a high tensile alloy steel usually supplied readily machineable in ‘T’ condition. 708M40 offers good ductility and shock resisting properties combined with resistance to wear. 708M40 can be flame or induction hardened.

 

 

TYPICAL ANALYSIS

 708M40

 

C.

Si.

Mn.

Cr.

Mo.

0.40%

0.25%

0.70%

1.20%

0.20%

 

 

    Mechanical Properties 708M40

Heat
Treatment

Tensile
Strength
Rm N/mm²

Yield
Stress
Re N/mm²

a% on
5.665ÖSo

Impact
Izod J

Impact
KCV J

Proof
Stress
rp0.2

Hardness
HB

Size
mm

R

700/850

495

15

34

28

480

201/225

>100≤250

S

775/925

555

13

27

22

540

223/277

>150≤250

S

775/925

585

15

54

50

570

223/277

>63≤150

T

850/1000

680

13

54

50

665

248/302

>29≤100

U

925/1075

755

12

47

42

740

269/331

>13≤63

V

1000/1150

850

12

47

42

835

293/352

>6≤29

W

1075/1225

940

12

40

35

925

311/375

>6≤19

 


Hardening:
Heat uniformly the 708M40 tool to 820/840°C until heated through. Quench in oil.

Tempering:
Heat the 708M40 tool uniformly and thoroughly at the selected tempering temperature, and hold at heat for one hour per inch of total thickness. 

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