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Home » Stainless Steel » Product introduction

709M40, 709M40T

  • Numbers: 20101221028
  • Model: 709M40, 709M40T, BS970
  • Producers: China
  • Update time: 2010.12.21
  • Browse:

Product Description:

709M40  is a high tensile  chromium molybdenum alloy steel usually supplied readily machineable in ‘T’ condition as 709M40T. Offering good ductility and shock resisting properties combined with resistance to wear, 709M40 is a widely used alloy steel specification.  709M40 can be flame or induction hardened.

 

 

TYPICAL ANALYSIS

 709M40

 

C.

Si.

Mn.

Cr.

Mo.

0.40%

0.25%

0.70%

1.20%

0.30%

 

 

    Mechanical Properties 709M40

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 709M40 tool to 820/840°C until heated through. Quench in oil.

Tempering:
Heat the 709M40 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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