| 摘要 |
Fabricated components, such as plastic injection molds, forging tools and machine components formed from a fine grained, low phosphorus, high hardness, high wear resistance, high hardenability, good machineability and high polishability, low alloy steel which is suitable for applications at elevated temperatures and at room temperatures, and an alloy steel having the following composition, - C .45-.60 - Mn .75-.95 - P .017 max - S .025 max - Si .15-.35 - Ni .60-2.00 - Cr .85-1.30 - Mo .40-.85 - V 0-.30 - Al 0-.030 - Ti .003-.020 - N2 40-90 ppm - the S, V and Al all being present in at least a small but effective amount, said steel and fabricated parts made therefrom being characterized by austenite grain boundaries being pinned with titanium nitrides.
|
