| 摘要 |
<p>1. Use, for the manufacture of cold-drawn weldless tubes for bicycle frames, of a low-manganese alloy steal consisting, by weight, of 0.16 to 0.20% of carbon, 1.20 to 1.50% of manganese, 0.15 to 0.50% of silicon, up to 0.035% of phosphorus, up to 0.035% of sulphur, up to 0.20% of nickel, up to 0.20% of chromium, up to 0.05% of molybdenum, 0.050 to 0.075% of vanadium, less than 0.10% of copper and than 0.010% of tin, optionally 0.007 to 0.030% of aluminium, the remainder consisting of iron and the usual impurities, whose proportion is kept at a very low level, the iron having, after a normalizing treatment, a fine structure containing dispersoids and a tensile strength higher than 700 N/mm**2 .</p> |
