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commented
3 years ago See zeroes in columns "silf","sihf","sisr" for the entries below (partial table contents):
["matnam", "astm_fs", "fedspec","Density", "ee", "gg", "kh","t010","t400","pte1","pte2","pte3","pte4","pte6","pte7","pte8","ptb1","ptb2","ptb3","ptb4","ptb6","ptb7","ptb8","silf","sihf","sisr", "siznam", "dumyc","longnam"],
["SPRING_BRASS", "B134", "QQW-321", 0.308, 16000, 5500, 1.00, 130, 120, 35, 36, 33, 30, 40, 39, 36, 55, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes", 27, "70/30 Brass spring wire - ASTM B-134 "],
["PHOSPHOR_BRONZE", "B159", "QQW-401", 0.320, 15000, 6250, 1.00, 145, 105, 40, 36, 33, 30, 40, 39, 36, 55, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes_pb", 12, "Phosphor Bronze spring wire - ASTM B-159 "],
["MONEL", "400", "(AMS7233)", 0.319, 26000, 9500, 1.00, 180, 145, 40, 36, 33, 30, 40, 39, 36, 55, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes_mon", 52, "Monel Alloy 400 AMS 7233 "],
["INCONEL_X-750", "SprTmp", "(AMS5698)", 0.298, 31000, 11500, 1.00, 200, 165, 40, 36, 33, 30, 40, 39, 36, 55, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes_750", 12, "Inconel X-750 Spring Temper AMS 5698 "],
["BERYLLIUM-COPPER", "B197", "QQW-530", 0.298, 18500, 6500, 1.00, 180, 170, 45, 36, 33, 30, 42, 39, 36, 55, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes", 2, "Beryllium Copper - ASTM B-197 "],
["TITANIUM", "BetaC", "(AMS4917)", 0.175, 16500, 6100, 1.00, 197, 170, 40, 36, 33, 30, 40, 39, 36, 50, 50, 45, 40, 0, 0, 0, 0, 0, 0, "sizes", "8?", "Ti-13V-11Cr-3Al Beta C Titanium - AMS 4917 "],
The materials tables, both US and metric units, have values of zero for the extension spring initial stress range ("silf","sihf","sisr") for non-ferrous materials (spring Brass, Phosphor Bronze, Monel Alloy, Inconel, Beryllium Copper, Titanium).
Need to find a good source for this info.