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Quote:
Originally Posted by Marco Tahtaras
For the frame, one piece of old literature stated the steel to be N0. 9 U.S.S. gauge hot-rolled open hearth steel, pickled and "limed". The steel had an elastic limit 42,000 lb. per sq. in. The Brinell hardness was held to 131 minimum.
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Mild steel is 120 so I wasn't too far off. Thanks.