Charpy Impact Toughness for Q&T 4140
Charpy Impact Toughness for Q&T 4140
(OP)
I'm looking for Charpy toughness of Q&T 4140 steel tempered at various temps, specifically Charpy at -40F. Strengths need to meet minimum 120/150ksi yield/tensile, 12/25 El/RA. Can anyone give me direction of where to look, this mechanical engineer has limited metals books. Thanks in advance for anyone's assistance in this matter.





RE: Charpy Impact Toughness for Q&T 4140
Regards,
Cockroach
RE: Charpy Impact Toughness for Q&T 4140
RE: Charpy Impact Toughness for Q&T 4140
“This engineer” should probably get some “metals books,” given that question.
That’s probably a pretty tough question for any of us to address off the top of our heads, any better than Cockroach did. These tests, and the results and reports are usually done for each heat of steel and/or for each batch of finished product. You can ask that they be done as part of the certification process and paperwork. When you’re talking about 100 tons of that type of material, which I assume you don’t just have laying in the back room, I would think you would want to talk with the likely suppliers. They will tell you what they can achieve and any special chemistry requirements, etc. to achieve what you need. You will find some very general info. on the subject in one of ASM’s Metals Handbooks. I don’t know that they have a tabulation of ranges of values, at different temps. for all of the various steels.
RE: Charpy Impact Toughness for Q&T 4140
In terms of chemistry, reduction in sulfur is usually because of concerns of sulfide stringers which provide a natural cleavage for cracking. There are several API papers on this given at conferences, surfing the net may give you information. But you would be better off consulting metallurgical references for the steel making industry.
Hope this helps, good luck.
Regards,
Cockroach
RE: Charpy Impact Toughness for Q&T 4140
WmTu
RE: Charpy Impact Toughness for Q&T 4140
Regards,
Cockroach