John asked- >Is there a way to detect a defective WAF? Scratch resistance? >Hardness testing?
The first test would be "what do the KR plans call for?" If there is no particular condition for the 4130 called for in the plans, then no further treatments are needed and normalized 4130 would be fine. Look in the catalogs like Aircraft Spruce's and you'll see that the 4130 sheet and tubes that they offer are MIL spec normalized. While it is true that both annealed and quenched & tempered 4130 have higher strength, greater hardness, and lower elongation than normalized metal, if those states of the metal aren't needed in this application, then no further testing should be required. There are lab tests for tensile strength and hardness of metals. I think a tensile test would require sacrificing a WAF to extract a standard tensile test coupon, but a Brinell hardness test wouldn't require cutting or damaging the WAF. I am a mechanical engineer and have conducted those types of tests. Oscar Zuniga Medford, OR KR 1-1/2 N335KC
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