AISI 1144 Hardness Problem
AISI 1144 Hardness Problem
(OP)
Hi Friends,
I have a screw machine part drawing and it is a new part for us. The material is 1144 Steel and required hardness is RC 30 min. The drawing doesn't mention anything about heat treatment process. I checked few sources and couldn't find this material having RC 30 min hardness. The maximum hardness that I found was about RC 20 without secondary heat treatment operation.
Does this mean that there is a secondary operation of heat treatment on this part, but some how they missed to mention it on the drawing?
Thanks,
unp1
I have a screw machine part drawing and it is a new part for us. The material is 1144 Steel and required hardness is RC 30 min. The drawing doesn't mention anything about heat treatment process. I checked few sources and couldn't find this material having RC 30 min hardness. The maximum hardness that I found was about RC 20 without secondary heat treatment operation.
Does this mean that there is a secondary operation of heat treatment on this part, but some how they missed to mention it on the drawing?
Thanks,
unp1





RE: AISI 1144 Hardness Problem
RE: AISI 1144 Hardness Problem
RE: AISI 1144 Hardness Problem
This usually means getting the print changed. The answer will be this is the way its been for years. Why do YOU need a print change. Didn't you see this when you quoted it......
Find out what engineering really needs and make it out of that material. Try to avoid purchasing department.
Do I sound bitter. Been there.....done that.
RE: AISI 1144 Hardness Problem
I have this material marked for Oil quench only. I also have this material marked with the railroad symbol.
The advice posted above to use a material at the required hardness is a very good idea. I would talk with the design engineer and appraise him of the potential pitfalls depending on the complexity of the part.
If they insist on the ANSI 1144 material at the stated specifications it can be accomplished.
RE: AISI 1144 Hardness Problem
Steel Tec of switzerland can provide a machine steel that is equivalent with 1144 but come with the hardness of RC 29~35 in as drawn condition.
Check this website.
http://www.steeltec.ch/index_produkte_e.html
Best regards,
ct