Sadly I can not give you definite answer to those answers to that, eg. not sure if its cast or forged.
actually this the wiki article not to bad https://en.wikipedia.org/wiki/Hydrogen_embrittlement and its also worth maybe checking out the references.
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1941 Chevrolet, Cab 12 CGT, 7A2 body
1944 Ariel W/NG
1944 Scammell Pioneer SV/2S x 2
1955 Austin Champ, 04BF45
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