High-toughness high-mirror pre-hardened die steel and manufacturing process thereof

Abstract

The invention discloses high-toughness high-mirror pre-hardened die steel and a manufacturing process thereof, and relates to the technical field of die steel. The high-toughness high-mirror pre-hardened die steel comprises raw materials including, by weight, 0.08-0.18 part of C, 0.1-0.5 part of Si, 2.2-3.0 parts of Mn, 2.5-3.3 parts of Cr, 0.1-0.5 part of Mo, 0.7-1.5 parts of Ni, 0.1-0.25 part ofV, 0. 01-0.02 parts of P, 0.0005-0.002 part of S and the balance Fe. Preparation processes of the mold steel comprise ingredient smelting, ladle refining, vacuum degassing, pouring, electroslag remelting, forging, annealing and finally quenching and tempering heat treatment; and the tempered structure is mainly tempered martensite and retained austenite. By means of the high-toughness high-mirrorpre-hardened die steel and the manufacturing process of the high-toughness high-mirror pre-hardened die steel, the hardenability of the die steel is fully improved by using Mn-Cr-Ni-Mo composite alloying, the hardness and uniformity of the die steel are ensured, the ductility, toughness and strength of the die steel are improved, the pre-hardened die steel is uniform in hardness, the hardness is38-43HRC, the polishing performance is high, the impact toughness is excellent, the hardenability is excellent, and meanwhile, good weldability and corrosion resistance are achieved.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a pre-hardened die steel with high toughness and high mirror surface and its manufacturing process. Background technique [0002] Mold processing and molding has a series of advantages such as high production efficiency, good quality, material saving and low cost. It has a wide range of applications. In the current industrial system, the most used molds are plastic molds, which are widely used in household appliances, automobiles, communications and other fields. , the development trend is large-scale and high polishing performance, which puts forward higher and higher requirements for mold polishing, hardness uniformity, toughness, etc. At present, the most used plastic mold steel is P20, 1.2738, NAK80, 1.2343, etc. The two can be used for industrial quenching and tempering heat treatment of blanks (usually modules), and the hardness is mostly controlled between 32-36HRC. The ...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a high-toughness, high-mirror-surface pre-hardened mold steel and its manufacturing process, which solves the problems of low hardness of the existing mold steel, poor mold polishing and welding performance, poor plasticity and toughness, and large molds. The uniformity of hardness and hardenability cannot be effectively guaranteed, and the customer needs to heat treatment by himself. Machining is difficult, and the production cycle and production cost of the mold are affected.

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