Impossible 65-45-12 Material Certs?
Impossible 65-45-12 Material Certs?
(OP)
Received certifications from a foreign ductile foundry with the following mechanical and chemical properties:
106,500 psi Tensile C 2.75, Si 2.44, Mn .39, P .o1, S.02
77,700 psi Yield Cr .03, Ni .09, Mo .22, Cu .13, g .05
16% elongation
187 HRB
Material ordered was 65-45-12. Now I am no metallurgist, but these values look completely absurd and impossible. They don't even look reasonable for 100-70-03 ductile. Please let me have your thoughts.
106,500 psi Tensile C 2.75, Si 2.44, Mn .39, P .o1, S.02
77,700 psi Yield Cr .03, Ni .09, Mo .22, Cu .13, g .05
16% elongation
187 HRB
Material ordered was 65-45-12. Now I am no metallurgist, but these values look completely absurd and impossible. They don't even look reasonable for 100-70-03 ductile. Please let me have your thoughts.





RE: Impossible 65-45-12 Material Certs?
http://www.ductile.org/didata/section4/4intro.htm
RE: Impossible 65-45-12 Material Certs?
We did not specify austempered ductile iron and I do not know why they would furnish it as such. The cert says nothing about post treatment.
What maximum tensile, yield and elongation values should you get on 65-45-12 ductile?
If they did austemper the castings, would that result in decreased machinability? Also, does the BHN of 187 look reasonable for the tensile strength?
RE: Impossible 65-45-12 Material Certs?
RE: Impossible 65-45-12 Material Certs?
Also the chemical prroperties do not suggest anything to have high such high values. this must be a coked up certificate. Destroy a casting and check for micro and mechanical properties.
I once had a research student who honestly made such claims of high tensile value and also high elongation. I verified his results ,method of testing etc and I could not find a fault. But I was sure about the error in testing. One day I walked upto the testing machine while the test was being conducted. guess what!! The machine had a Zero error. He was reading a higher breaking load without factoring for the zero error.
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Impossible 65-45-12 Material Certs?
RE: Impossible 65-45-12 Material Certs?
" All that is necessary for triumph of evil is that good men do nothing".
Edmund Burke
RE: Impossible 65-45-12 Material Certs?
TVP: Hardness is HB not HRB. My error.
Arunmrao: Mexico
Thanks for you help.