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Certificates

WKZ030-2006           WH70

1.The billet heating temperature of 1200 ~ 1240 ℃, the temperature of 1180 ~ 1200 ℃soaking pit, total heating time ≥4.5 hours, high temperature period (refers to heating section and soaking pit section) accumulated heating time ≥3 hours, but high temperature period of accumulative total heating time try to not more than 5 hours.Ingot heating temperature 1220 ℃, holding time extended 2 hours based on the Ⅱgroup .

2.2. Ingot, billet open rolling temperature 1050 ~ 1150℃.

3. WH70 controlled rolling process and cold process, according the table execution:

 

 

Specificatio-n

mm

Ⅱstage

Ⅲstage

Turn to red temperature

℃

Air steel thickness

Open rolling temperature

Air steel thickness

Open rolling temperature

Finishing temperature

≤15

40

/

/

≤950

730~78

No watered

15

60

≤950

30

≤900

730~820

540~560

20

70

≤920

35

≤830

730~780

540~560

25

75

≤920

40

≤830

730~780

540~560

30

90

≤920

45

≤830

730~780

540~560

40

120

≤920

60

≤830

730~780

540~560

50

150

≤920

75

≤830

750~800

540~560
 

 

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