High-quality H13 rear earth mold steel and production method thereof

A production method and technology of die steel, which is applied in the field of die steel manufacturing, can solve the problems of unstable rare earth treatment effect and failure to realize large-scale production of rare earth die steel, and achieve the goals of improved service life, high mechanical properties, and high purity Effect

Inactive Publication Date: 2013-08-14
INNER MONGOLIA NORTH HEAVY INDS GROUP
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Problems solved by technology

However, due to the control of the oxygen and sulfur content in the steel, the rare earth treatment effect is unstable, and the rare earth mold steel has not been able to achieve large-scale production

Method used

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  • High-quality H13 rear earth mold steel and production method thereof

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Embodiment 1

[0019] The composition and weight percentage of the high-quality H13 rare earth mold steel used in the present invention are: C 0.37-0.42%, Si 0.80-1.20%, Mn 0.20-0.50%, Cr 5.00-5.50%, Mo 1.20-1.75%, V 0.80 ~1.20%, P≤0.025%, S≤0.005%, La or Ce 0.001~0.010%, Fe balance.

[0020] In the present embodiment, the technical process and steps of hot work die steel are as follows:

[0021] (1) Electric furnace smelting and LF furnace refining: According to NADCA207-2011, the composition and weight percentage of high-grade H13 steel are: C 0.37-0.42%, Si 0.80-1.20%, Mn 0.20-0.50%, Cr 5.00-5.50%, Mo 1.20~1.75%, V 0.80~1.20%, P≤0.025%, S≤0.005%, the rest of Fe is batched and smelted in an electric furnace, and the tapping P≤0.010% is controlled, and then LF furnace alloying and desulphurization are carried out, so that S≤0.005%.

[0022] (2) VD furnace vacuum degassing and rare earth feeding line: vacuum carbon deoxidation, total oxygen in steel ≤ 15PPm; feeding rare earth magnesium ca...

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Abstract

The invention relates to high-quality H13 rear earth mold steel and a production method thereof, and belongs to the technical field of mold steel making. The high-quality H13 rear earth mold steel provided by the invention comprises the following ingredients based on weight percent: 0.37-0.42% of C, 0.80-1.20% of SiO, 0.20-0.50% of Mn, 5.00-5.50% of Cr, 1.20-1.75% of Mo, 0.80-1.20% of V, not greater than 0.025% of P, not greater than 0.005% of S, 0.001-0.010% of rear earth element, and the balance of Fe. The production method of the mold steel provided by the invention comprises the following steps of electric furnace smelting, ladle furnace LF refining, VD furnace vacuum degassing, rear earth-magnesium-calcium composite line feeding, argon-protected pouring, forging, annealing and thermal treatment. The mold steel provided by the invention has the following great advantages of high purity, high tissue uniformity, high mechanical property and isotropy, effectively improves the service life of a mold, and reduces production cost.

Description

technical field [0001] The invention relates to a high-quality H13 rare earth die steel and a production method thereof, belonging to the technical field of die steel manufacture. Background technique [0002] Mold steel is an essential material for making molds. Since the hot working die is in contact with the hot metal, it is required to have high temperature strength, wear resistance and toughness, thermal fatigue resistance and oxidation resistance, as well as high hardenability and small deformation. In order to meet the above requirements of the mold, there are special requirements for steel properties: uniform steel composition, uniform structure, uniform hardness; pure steel, low content of harmful elements and non-metallic inclusions in steel; dense steel, no porosity, looseness, Small segregation: small anisotropy of steel. [0003] American H13 steel (equivalent to my country's 4Cr5MoSiV1) has good comprehensive properties and is widely used in hot forging dies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C21C7/04C21D8/00
Inventor 雷丙旺胡永平李金昆李宝臣崔淑梅石宝凤任胜利李连贵徐亚东
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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