ASTM A182 F22 Quench Properties

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SUMMARY

The discussion focuses on the quench properties of ASTM A182 F22 steel, specifically regarding the depth of hardness retention after machining. The user seeks methods to quantify the expected drop in hardness as material is removed, noting that Critical Diameter analysis is not suitable due to elemental composition variations. The Jominy End-Quench Test is suggested as a potential method for assessing hardness profiles, alongside metallographic analysis to evaluate microstructure and grain morphology.

PREREQUISITES
  • Understanding of ASTM A182 F22 steel specifications
  • Knowledge of quenching and tempering processes
  • Familiarity with metallographic techniques for microstructure analysis
  • Experience with hardness testing methods
NEXT STEPS
  • Research the Jominy End-Quench Test for hardness profiling
  • Study metallographic techniques for assessing grain size and morphology
  • Explore methods for calculating hardness drop during machining
  • Review ASTM standards related to quenching and tempering of steels
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Metallurgists, materials engineers, and quality assurance professionals involved in the processing and testing of quenched and tempered steel components.

Quality Man
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Greetings!

First time poster here. I'd appreciate whatever help anyone can provide.

I have some pieces of F22 that were quenched and tempered. My customer needs to know how deep the quench properties extend, as he intends to machine off some of the O.D.

Critical Diameter analysis is not appropriate because some of the elemental percentages are outside the ranges evaluated by Grossman.

I need a method, spec, link, or something to determine how much drop in hardness to expect as material is removed.

Thank you!
 
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As part of a process qualification, in this case a quench, one would normally take parts of a given geometry at some temperature, quench one or some small number, then cut the pieces transverse (normal to the heat transfer surface), and with metallography ascertain the microstructure (grain size and morphology), and perhaps measure hardness with the appropriate method. Then one would have a profile of physical properties as a function of depth.
 

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