jbray241
Civil/Environmental
- Oct 14, 2016
- 2
Hi
I am a relatively new engineer so I apologize in advance if I am asking an obvious question. I've been tasked with an interesting, but slightly out of my field problem that has to do with the chemical composition of steel.
I am trying to compare test samples of steel components against ASTM specification standards. Basically it is QA work to make sure that the samples' chemical compositions comply with the ASTM standards. However I running into a bit of an issue with regards to what elements the ASTM standard includes in its "chemical requirements".
For instance in ASTM 705/705M, "Age-Hardening Stainless Steel Forgings", the "Chemical Requirements" table includes max % (by mass) values for Si, Ca, Ni, Al, etc. but omits other elements such as Fe, O, Co (elements that you would certainly expect to see in steel).
I suspect there maybe some sort of "baseline" values for these elements included in a "General Steel" Standard, but I cannot seem to find it. I understand the max percentages won't necessarily "add up" since they are all maximums values. However I find it strange that iron isn't included.
Is there anyone more familiar with steel/steel standards that can explain how these standards should be used?
I am a relatively new engineer so I apologize in advance if I am asking an obvious question. I've been tasked with an interesting, but slightly out of my field problem that has to do with the chemical composition of steel.
I am trying to compare test samples of steel components against ASTM specification standards. Basically it is QA work to make sure that the samples' chemical compositions comply with the ASTM standards. However I running into a bit of an issue with regards to what elements the ASTM standard includes in its "chemical requirements".
For instance in ASTM 705/705M, "Age-Hardening Stainless Steel Forgings", the "Chemical Requirements" table includes max % (by mass) values for Si, Ca, Ni, Al, etc. but omits other elements such as Fe, O, Co (elements that you would certainly expect to see in steel).
I suspect there maybe some sort of "baseline" values for these elements included in a "General Steel" Standard, but I cannot seem to find it. I understand the max percentages won't necessarily "add up" since they are all maximums values. However I find it strange that iron isn't included.
Is there anyone more familiar with steel/steel standards that can explain how these standards should be used?