| 摘要 |
A steel in which the only alloying additive (besides carbon) is molybdenum and/or tungsten in a total amount of 0,2 - 2,0 %. The steel is manufactured by a method whereby an increased ferrite amount is produced in the steel before pearlite is formed therein by keeping the cooling rate below a critical value, thereby facilitating working of the steel before its final treatment (such as by tempering). The amount of silicon and manganese in the steel is particularly limited, the total content of silicon and manganese being less than 0,30 % and the amount of each of these substances, silicon and manganese, is preferably below 0,15 %. In a certain embodiment, 1 - 2 % of chromium is also added to the steel in order to increase the temperability of the steel. <IMAGE> |
