1. Acetylene is a crucial component in low-pressure carburizing, which creates strong, wear-resistant surface layers on steel parts

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4. 8620 is a low nickel - chromium - molybdenum medium hardenability, Case hardening (carburizing) steel, generally supplied in the as rolled condition with a maximum brinell hardness of 280 (Rc30).Characterised by good core strength and toughness in small to medium sections with case hardness up to Rc62 when carburized, hardened and tempered.8620 can also be used (uncarburised) …