Reference data for hot-strength seamless steel pipes, normalized and tempered after hot working

 

Grade

Code

Thermal processing℃

Normalizing℃

Modulation

St35.8

1.0305

1100-850③

900-930

Quenching②℃

Tempered℃

St45.8

1.0405

870-900

-

-

17Mn4

1.0481

880-910

-

-

19Mn5

1.0482

880-910

-

-

15Mo3

1.5415

910-940

-

-

13CrMo44

1.7335

-

910-940

660-730

10CrMo910④

1.7380④

-

900-960

700-750

14MoV63

1.7715

-

950-980

690-730

X20CrMoV121

1.4922

-

1020-1070

730-780

①(title)The workpiece must reach the specified temperature along the entire section. If this can be guaranteed, then during normalizing and quenching, there is no need to continue holding at this temperature. During tempering, 13CrM044 and 10CrM0910 steels need to be kept at the specified temperature for at least 30 minutes, while 14MoV63 and X20CrMoV121 steels need to be kept for at least one hour. rise.
②Air cooling or cooling with protective gas. If the tube wall is thick, accelerated cooling, such as liquid cooling, is necessary.
③ During processing, the temperature can drop to 750C.
④ For this steel grade, in addition to the specified quenching and tempering treatment, the following treatment procedures can also be considered:900-950C1 furnace cooled to 700C ≥ 1 hour 700C heat preservation // air cooling.

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From:http://boilersteelpipe.com/pro/smls/reference-data-for-hot-strength-seamlesssteel-pipes-normalized-and-tempered-after-hot-working.html

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