Need advice with material tuning
Need advice with material tuning
(OP)
Hello,
our company was asked with delivery of castings made of steel with these parameters:
1) chemical composition: C max 0.25%, Mn max 1.00%, Si max 0.50%, Cr max 0.25%, Ni max 0.35%, Mo max 0.10%.
2) CE max 0.42 (acc. to CE = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15)
3) yield strenght min 300 MPa, tensile strenght min 520 MPa, elongation min 17%
4) CVN-20°C min 27J
5) heat treatment normalization only
The castings and test blocks have wall thickness about 35 mm.
My question is, if it is possible to reach all of desired parameters? I think for rolled steel probably yes, but for castings...
I have fear, that some of the parameters are in contradiction to others (CE versus TS...).
My greatest concern is, that when I get desired strenghts, that I will not reach desired impact energy.
Any help would be appreciated.
Dalin
our company was asked with delivery of castings made of steel with these parameters:
1) chemical composition: C max 0.25%, Mn max 1.00%, Si max 0.50%, Cr max 0.25%, Ni max 0.35%, Mo max 0.10%.
2) CE max 0.42 (acc. to CE = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15)
3) yield strenght min 300 MPa, tensile strenght min 520 MPa, elongation min 17%
4) CVN-20°C min 27J
5) heat treatment normalization only
The castings and test blocks have wall thickness about 35 mm.
My question is, if it is possible to reach all of desired parameters? I think for rolled steel probably yes, but for castings...
I have fear, that some of the parameters are in contradiction to others (CE versus TS...).
My greatest concern is, that when I get desired strenghts, that I will not reach desired impact energy.
Any help would be appreciated.
Dalin





RE: Need advice with material tuning
RE: Need advice with material tuning
RE: Need advice with material tuning
RE: Need advice with material tuning
I have several test blocks with chemistry:
C 0.24%, Mn 0.55%, Si 0.24%, Cr 0.07%, Ni 0.03%, Mo 0.09%(added), V 0.14%(added), Cu 0.04%, Nb 0,050%(added), Al 0.052%(added), CE = 0.40, P 0.016%, S 0.009% (it was done in induction furnace so no way to do somthing about P and S).
My original plan was do to various combinations of normalizing(920°C) and tempering(650°C) - N, N+T, N+N and N+N+T, with variation of cooling on still air and forced air.
N (forced air) - YS 387 MPa, TS 573 MPa, EL 17%, CVN-20°C 5,7,8,12 J.
N (forced air) + T - YS 400 MPa, TS 586 MPa, EL 22.2%, CVN-20°C 4,4,10,5 J.
Unfortunately I did not let to check grain size (my mistake).
I will continue with testing after double normalizing.
As my metalurgy mentor said "good luck with that material" and I hope I will have one.
Dalin
RE: Need advice with material tuning
RE: Need advice with material tuning