Plastic mold steel 718 and production process thereof

Abstract

The invention provides plastic mold steel 718 and a production process thereof, and relates to the technical field of steel and iron smelting. The plastic mold steel 718 comprises the following chemical components in percentage by mass: 0.37-0.40% of C, 0.4-0.5 of Si, 1.4-1.5 of Mn, 1.8-2.0 of Cr, 0.4-0.5 of Mo, 1.0-1.1 of Ni, P not more than 0.008, S not more than 0.003, 0.018-0.030 of Als, and the balance of Fe and residual elements; and the thickness is 150 mm. The plastic mold steel 718 is excellent in mechanical performance, high in strength and excellent in impact resistance.

Description

technical field

[0001] The invention relates to the technical field of iron and steel smelting, in particular to a plastic mold steel 718 and a production process thereof. Background technique

[0002] 718 die steel is a brand of pre-hardened hot work die steel. This steel has excellent mechanical properties and machinability, and is widely used in the mold industry, especially in the field of plastic mold processing and production. In addition, its special production process makes 718 mold steel already have a hardness of 330~370HBW when it leaves the factory, so it can reduce the heat treatment link in the normal mold processing and production and improve economic benefits. Except that it cannot be used for plastic mold parts with corrosion resistance requirements, it is currently the most widely used typical steel grade for general-purpose plastic mold steel. Often referred to as "advanced" plastic mold steel, it is often used as a comparison model for newly developed ne...