heat treating 4130 steel

[eds026]

I tried to heat treat a piece of 4103 steel .125 thick 6 inches long shaped like a "u". I put the piece in the furnace at 1600 degrees for 2 hours (the oven was preheated), then oil quenched, and anealed at 700 degrees for 1 1/2 hours. The rockwell hardness I achevied was only 22 on the c scale. I would like to achive 45-50.

thank you

 

[swall]

metengr--I've worked with these accelerated (i.e. short time/higher temp)tempering processes, both induction and furnace heating. Interesting topic for a separate thread. But, I would like to hear back from eds026 to get his specific chemistry to try to understand why his part did not harden up.

 

[eds026]

I can't find the chemistry, I was told by the engineer that he has certs for the steel that he had bent up in the shape of a "u" a little longer than 8" long. The part did twist in the heat treat process that I used.

Thank you everyone for the input.

 

[eds026]

The part I just finnished and The rockwell is 41 and very little twisting in the part. Thank everyone.