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Plastic mold steel with excellent high temperature strength and preparation method thereof

A technology of plastic mold steel and high temperature strength, applied in the field of metal materials, can solve the problems that do not conform to the development direction of mold steel, the high temperature performance and corrosion resistance are difficult to guarantee, and the production cycle is long.

Active Publication Date: 2021-09-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has high strength and wear resistance through forging and series heat treatment, but it is difficult to guarantee high temperature performance and corrosion resistance, and the production cycle is long, which does not meet the development direction of die steel

Method used

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  • Plastic mold steel with excellent high temperature strength and preparation method thereof
  • Plastic mold steel with excellent high temperature strength and preparation method thereof
  • Plastic mold steel with excellent high temperature strength and preparation method thereof

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Embodiment Construction

[0028] Below by embodiment the present invention will be further described.

[0029] In the embodiment of the present invention, according to the composition ratio of the technical solution, molten iron pretreatment—smelting—LF—RH—continuous casting—slab heating—rolling—straightening—slow cooling—normalizing—tempering is performed.

[0030] Heat the continuous casting slab to 1230-1280°C, keep it warm for 5-6h in the soaking section,

[0031] The starting rolling temperature is 1050-1080°C, the reduction rate of the first three passes is 18%-22%, the final rolling temperature is ≥950°C, and the off-line temperature of the steel plate is 300-400°C; immediately after off-line The stacking is slowly cooled, and the slow cooling time is 28-38h.

[0032] Then normalize at 900-950°C, keep warm for 4-5h, and air cool to room temperature; then temper at 630-680°C, keep warm for 2-3h.

[0033] The composition of the steel of the embodiment of the present invention is shown in Table 1...

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Abstract

The invention provides a plastic mold steel with excellent high-temperature strength and a preparation method thereof. The components of the mold steel are as follows by weight percentage: C: 0.30%-0.40%, Si: 1.10%-1.30%, Mn: 0.9% ‑1.1%, P≤0.015%, S≤0.015%, Cr: 10.0%‑11.0%, Mo: 0.42%‑0.60%, V: 0.1%‑0.2%, Ta: 0.10%‑0.20%, Co: 0.40% -0.60%, wherein, Mo+V+Ta=0.7%-0.9%, the balance is Fe and unavoidable impurities. The preparation method includes molten iron pretreatment—smelting—LF—RH—continuous casting—slab heating—rolling—straightening—slow cooling—normalizing—tempering; the hardness of the mold steel obtained by applying the present invention is 44-46HRC, which is the same as that of the slab. Difference ≤ 2HRC; Rm of the transverse core at room temperature ≥ 1460MPa; Rm of the transverse core at 500°C ≥ 710MPa; at the same time, this kind of mold steel has good acid corrosion resistance.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to plastic mold steel with excellent high-temperature strength and a preparation method thereof. Background technique [0002] The rapid development of the plastics industry determines that the requirements for forming molds will become higher and higher. While having high strength and toughness, they also need to have certain corrosion resistance. Since the hardness of plastic mold steel is generally high, cutting processing Sex becomes the focus of end-user concerns. In addition, the plastic molding temperature is generally between 150-400°C, and it can reach about 600°C in a short period of time. Excessively high temperature will cause thermal deformation of the mold and reduce the precision. If the strength of the mold steel is too low at high temperature, the mold will fail. scrapped. Therefore, plastic mold steel is also required to have good high temperature strength. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/30C21D8/02C21D1/28C21D1/18
CPCC21D1/18C21D1/28C21D8/0226C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24C22C38/26C22C38/30
Inventor 冯丹竹隋轶隋广雨赵坦范刘群王婷
Owner ANGANG STEEL CO LTD
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