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M-1 Helmet Production Breakage VIII Differences In The Steel Making Process How differing steel making methods affected M-1 helmet cracking.

M-1 Helmet Production Breakage VII Sharon Steel Corp. & Helmet Steel Defects Decarburization and martensite formations, new problems same results.

M-1 Helmet Production Breakage VI - Deja Vu Supplemental contracts meant to help make up for breakage losses actually increased losses.

M-1 Helmet Production Breakage V - Part Deux Schlueter & Sharon Early in 1943 two new companies entered the helmet field, the Schlueter Manufacturing Company of St. Louis, Missouri undertook the manufacture of helmets and the Sharon Steel Corp. of Sharon, Pa. the manufacture of Hadfield manganese steel helmet stock.

M-1 Helmet Production Breakage IV Metallurgy, Fabrication and Residual Stress Heat-treating steels for maximum hardness is a delicate scientific process requiring precise supervision to avoid weak pockets in the final sheet stock whereas cold working Hadfield’s manganese to the same level of strength makes this unnecessary.