| 摘要 |
The present invention refers to steel to manufacture forged pieces the chemical composition of which comprises, by weight, 0.1 percent <- 0.4 percent; 1 percent <- Mn <- 1.8 percent; 0.15 percent <- Si <- 1.7 percent; 0 percent <- N1 <- 1 percent; 0 percent <- Cr <- <- 1.2 percent; 0 percent <- Mo <- 0.3 percent; 0 percent <- V <- 0.3 percent; Cu<- 0.35 percent; eventually from 0.005 percent to 0.06 percent of aluminum, eventually boron in concentration comprised between 0.0005 percent and 0.01 percent, eventually between 0.005 percent and 0.03 percent of titanium, eventually from 0.005 percent and 0.06 percent of niobium, eventually from 0.005 percent to 0.1 percent of sulfur, eventually up to 0.007 percent of calcium, eventually up to 0.03 percent of tellurium, eventually up to 0.05 percent of selenium, eventually up to 0.05 percent of bismuth, eventually up to 0.1 percent of lead, balance being iron and impurities resulting from manufacturing-. A process for a forged piece manufacturing is also described.
|
