Mechanical properties not achieved

[Saurav Mukheja]

Dear All

please help me to provide the specific reason of not getting the desired mechanical properties after HQT of AISI 4130 pipe of 3 inch

parameters taken for HQT
Process Temperature ⁰C Soaking Time (Hrs)
Normalizing 900 2:00
Hardening 860 2:00
Tempering 550 2:30

Results achieved are attached

 

[Dhurjati Sen]

Dear Saurav,

Check the furnace parameters and also carry out PMI of the material. Your answer might lie there.

Regards.

DHURJATI SEN

 

[weldstan]

Why such long soak times for 3" diameter pipe?

 

[WKTaylor]

What is the pipe wall thickness?

Regards, Wil Taylor

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[MagBen]

In looking at the attached results, I would first follow Dhurjati's suggestion, we got so much different results from trial 1 and 2 (if you used a same temper temperature)!