| 摘要 |
A cold workable and age-hardenable steel includes weight percentages of carbon and manganese within an area enclosed by a line connecting a point P indicating zero weight % of carbon and 1.8 weight % of manganese, a point Q indicating 0.08 weight % of carbon and 0.5 weight % of manganese, and a point R indicating 0.08 weight % of carbon and zero % of manganese to a point S indicating zero weight % of carbon and zero weight % of manganese; less than 0.6 weight % of silicon; as age-hardenability improving alloying metals more than 2.5 weight % of nickel and more than 0.6 weight % of aluminium or more than 2.5 weight % of nickel, more than 0.6 weight % of aluminum and more than 0.5 weight % of copper or more than 2.5 weight % of nickel, more than 0.6 weight % of aluminum and more than 0.5 weight % of titanium or more than 2.5 weight % of nickel, more than 0.6 weight % of aluminum, more than 0.5 weight % of copper and more than 0.5 weight % of titanium; the total amount of nickel and aluminum or nickel, aluminum and copper or nickel, aluminum and titanium or nickel, aluminium, copper and titanium being in the range of from 4.5 to 6.5 weight %; and the balance which is substantially iron and impurities. |
