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Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof

A chrome-molybdenum-vanadium and die steel technology is applied in the field of chrome-molybdenum-vanadium series hot working tool steel and its heat treatment process, which can solve the problems of small electroslag ingots, low product grades, and coarse material grains.

Inactive Publication Date: 2011-10-12
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This manufacturing process has the following problems: 1) The size of the electroslag ingot is small, and the small ingot size reduces the yield and manufacturing capacity of the product; 2) The original structure of the electroslag ingot has a large number of large particles or massive liquefied carbonization 3) The grain size of the material after forging is coarse, resulting in low impact toughness of the material after quenching and tempering, and the product grade is low, which cannot meet the market demand for high toughness hot work die steel need

Method used

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  • Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof
  • Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof
  • Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof

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Embodiment 1

[0034] In this example, the composition and weight percentage of the hot work die steel are as follows:

[0035] C 0.32%, Si 1.0%, Mn 1.0%, Cr 4.0%, Mo 1.0%,

[0036] V 0.6%, P 0.01%, S 0.01%, Fe balance.

[0037] In the present embodiment, the technical process and steps of hot working tool steel are as follows:

[0038] A Electric furnace smelting: smelting in an electric arc furnace according to the above-mentioned ratio of alloying elements, the melting temperature is greater than 1500°C, casting into φ400mm-φ450mm electrode rods and cooling in air;

[0039] B Electroslag remelting: Place the poured steel ingot as a consumable electrode in the electroslag remelting device for electroslag remelting. The slag melting voltage is 56-62V, the current is 3000-5000A, and the electric system voltage is 57-59V. , current 11000-12000A, capping voltage 57-59V, current time 35-50Min, electroslag remelting into 500Kg-3000Kg electroslag ingot;

[0040] C High-temperature homogenizati...

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Abstract

The invention relates to low-cost chromium-molybdenum-vanadium hotwork tool-die steel and a heat treatment process thereof and belongs to the technical field of alloy steel manufacturing processes. The steel comprises the following components by weight percent: 0.3-0.4% of C, 0.6-1.2% of Si, 0.6-1.2% of Mn, 3.5-4.5% of Cr, 0.8-1.2% of Mo, 0.4-0.8% of V, less than 0.02% of P, less than 0.02% of S and the balance of Fe. The preparation process of the hotwork tool-die steel is as follows: mixing, smelting, casting and then remelting electroslag; carrying out homogenization treatment at 1200-1280 DEG C for 8-10 hours, then forging, and carrying out ultrafining heat treatment and isothermal annealing treatment; and finally quenching and tempering, namely heating steel ingots to 1000-1100 DEG C to be austenitized and carrying out tempering two to three times at 560-620 DEG C after carrying out oil quenching or high pressure gas quenching. The hotwork tool-die steel has the advantages of high heat stability and roughness and good heat fatigue property.

Description

technical field [0001] The invention relates to a chromium-molybdenum-vanadium series hot working tool steel and its heat treatment process. The tool steel not only reduces the alloy cost (compared to the H13 series steel), but also has high thermal stability and good toughness and heat treatment. The invention relates to fatigue performance, which belongs to the technical field of alloy steel manufacturing technology. Background technique [0002] Tool steel can generally be divided into three major categories of hot work, cold work and plastic tool steel. Hot working tool steel is mainly used to manufacture aluminum alloy die-casting molds and copper-zinc die-casting molds. It is one of the most widely used and most consumed tool steels. Its working conditions are complicated and it takes a long time and heating during work. When the hot metal is put into the cavity of the hot work mold, the surface of the cavity heats up sharply, and the surface layer generates compressi...

Claims

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Application Information

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IPC IPC(8): C22C38/24C21D8/00C21D1/26C21D1/18
Inventor 周青春吴晓春闵永安吕广奇汪宏斌
Owner SHANGHAI UNIV
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