Heat Treat Standards on print
Heat Treat Standards on print
(OP)
When creating manufactuering prints is their a standard on how to specificy the strenght the of the material or Heat treat procedure?
For example, I have specifcied a print for a forged valve. Can I just specify the Yield Strength, Tensile Strength and Elongation. Or is there a standard I should reference.
Any help is appreicated.
For example, I have specifcied a print for a forged valve. Can I just specify the Yield Strength, Tensile Strength and Elongation. Or is there a standard I should reference.
Any help is appreicated.





RE: Heat Treat Standards on print
For example, ASTM A182 specifies alloy and stainless steel valve forgings. This specification includes both mechanical properties and specified heat treatments.
If you need to modify from specified properties, you can call this out in the drawing. I would strongly discourage putting only specified mechanical properties or heat treatments on a drawing as you may end up with material of poor quality with other unacceptable properties.
Aaron Tanzer
www.lehightesting.com
RE: Heat Treat Standards on print
Examples: For a steel forging there is ASTM A788 and hundreds of others. You can prob find one pertaining to valves. For heat treatment of steel, there's SAE-AMS-H-6875 (or MIL-H-6875, same). Some are available free, online; others you have to buy.
RE: Heat Treat Standards on print
RE: Heat Treat Standards on print
Aaron Tanzer
www.lehightesting.com
RE: Heat Treat Standards on print
quench hardened and tempered
according to HTO
(59+40) HRC
HTO is an abbreviation for Heat-Treatment Order, which would be a more specific document identifying the process requirements.
RE: Heat Treat Standards on print
MIL-H-6875 only minimum and maximum tensile strength and not Rockwell hardness. Specifying Rockwell hardness instead of tensile strength doesn't comply with MIL-H-6875.
RE: Heat Treat Standards on print
RE: Heat Treat Standards on print
1045 Q&T
Min 75 ksi Yeild
Min 100 ksi tensile
Min Elongation 15%
Hardness Approx. HRC30
(MIL-H-6875)
I would think this is enough, but I would think I would need to mentioned to descale the part as well. The challenge comes in when case hardening, I would think I would just mention to core hardness and the depth of the case.
RE: Heat Treat Standards on print
-Your HRC seems high for the yield/tensile unless this is a general hardness max you have to stay under.
-1045 is usually not a very good candidate for QT unless the diameter is small and impact toughness is not concerned.
-your coverage on mechanical properties is pretty good now, except no Charpy. Again, this is up to your application and design code, if any.
- you probably need chemistry and NDE results for critical parts.
- descale? Not a really concern usually. Is forging your final step? If yes, you may have to specify surface condition and really a surface NDE will be best. You never got good finish from hot forging.
- 1045 is not case hardening chemistry, I assume you meant another chemistry when you said case...
- for case hardening, you would want to specify case hardness and depth required, and sure core hardness as well.
Just some random comments, hope helpful.
RE: Heat Treat Standards on print
surface hardened (with the area indicated by a type 04.2.1 long-dashed dotted wide line, in accordance with ISO 128-24:1999)
620 0+160 HV30
SHD 500 = 0.8 0+0.8
RE: Heat Treat Standards on print
Thanks for all the feedback though.