Alloy Steel Seamless Pipe

.

Grade

Recommended Heat Treatment System

Tensile Property

Quenching (Normalizing)

Tempering

Tensile Strength
Rm/MPa

Lower Yield
Strength Relf/MPa

Elongation A/％

Temperature,℃

Coolant

Temperature,℃

Coolant

First

Second

Not less than

1

40Mm2

840

-

Water and oil

540

Water and oil

885

735

12

2

45Mm2

840

-

Water and oil

550

Water and oil

885

735

10

3

27SiMn

920

-

Water

450

Water and oil

980

835

12

4

30Cr

860

-

Oil

500

Water and oil

885

685

11

5

35Cr

860

-

Oil

500

Water and oil

930

735

11

6

40Cr

850

-

Oil

520

Water and oil

980

785

9

7

12CrMo

900

-

Air

650

Air

410

265

24

8

15CrMo

900

-

Air

650

Air

440

295

22

9

35CrMo

850

-

Oil

550

Water and oil

980

835

12

10

42CrMo

850

-

Oil

560

Water and oil

1080

930

12

11

12CrMoV

970

-

Air

750

Air

440

225

22

12

12Cr1MoV

970

-

Air

750

Air

490

245

22

13

20CrMn

850

-

Oil

200

Water and air

930

735

10

14

40CrNiMoA

850

-

Oil

600

Water and oil

980

835

12

15

45CrNiMoVA

860

-

Oil

460

Oil

1470

1325

7

A. Allowable range of adjusting heat treatment temperatures listed in the table: Quenching ±20℃;
low-temperature tempering ±30℃and high-temperature tempering ±30℃.

B. Boron steel can be normalized before being quenched. The normalizing temperature
shall not be higher than the quenching temperature.

C. Steel shall be delivered according to a group of data specified by the demander. Otherwise,
the delivery shall be performed in light of any group of data.

D. The first quenching for steel containing chromium, manganese and titanium can be replaced with normalizing.

E. Quenching at constant temperature of 280-320℃is required.