Hot stamping mould steel and method for manufacturing same

A technology of hot stamping dies and manufacturing methods, which is applied in the field of hot work die steel and its manufacturing, can solve the problems of reduction and cost increase, and achieve the effects of improving comprehensive performance, reducing costs and increasing thermal conductivity

Inactive Publication Date: 2012-07-25
BAOSTEEL SPECIAL STEEL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since the patent greatly increases the content of chromium, reduces the content of vanadium, and increases nickel and tungsten, although it can obtain steel with higher hardness and heat resistance, its cost also increases significantly

Method used

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  • Hot stamping mould steel and method for manufacturing same

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Embodiment 1-5

[0046] The specific steps of manufacturing hot stamping die steel are as follows (the chemical composition of each steel grade is shown in Table 1 in this case embodiment 1-5):

[0047] (1) Smelting: electric arc furnace smelting, the tapping temperature of molten steel is 1545~1555℃;

[0048] (2) Casting: casting into φ400mm~φ450mm electrode rod;

[0049] (3) Electroslag remelting: the voltage of the electric system is 57-59V, the current is 11000-12000A, and the electroslag is remelted into an electroslag ingot of 2000-3000kg;

[0050] (4) Put the electroslag ingot into the heating furnace of the radial forging machine with a furnace temperature of 700-800°C, heat it to 1230-1260°C at a heating rate of 80-120°C / h, and then keep it warm for 3-5 hours;

[0051] (5) Diameter forging machine forging: the forging start temperature is 1100-1150°C, and the stop forging temperature is 850-900°C;

[0052] (6) Put the electroslag ingot into an annealing furnace at 740-830°C for 14-1...

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Abstract

The invention discloses a hot stamping mould steel which comprises the following chemical elements in percent by weight: 0.43-0.48% of C, 0.3-0.5% Si, 0.5-0.8% of Mn, 2.3-2.7% of Cr, 1.9-2.4% of Mo, 0.7-1.0% of V, 0.03% of P or less, 0.03% of S or less and the balance of Fe and other inevitable impurities. In addition, the invention further discloses a method for manufacturing the hot stamping mould steel, which adopts the electroslag remelting process and the high-temperature homogenization and ultrafining heat-treatment process to control the material tissue so as to strengthen the material and improve the performance index of the material. Compared with the prior material, the thermal conductivity coefficient of the hot stamping mould steel is improved by more than 29.5%, the tempering hardness is improved by more than 7.5%, and impact toughness is improved by more than 16.7%. In addition, the hot stamping mould steel has the advantages of low-cost and high comprehensive performance.

Description

technical field [0001] The invention relates to a die steel and a manufacturing method thereof, in particular to a hot work die steel and a manufacturing method thereof. Background technique [0002] Die steel can usually be divided into three categories: hot work die steel, cold work die steel and plastic die steel. Hot stamping die steel belongs to the category of hot work die steel, which is mainly used to obtain ultra-high strength stamping parts. The hot stamping process of the steel plate is to heat the special high-strength steel plate to the austenitic temperature range, and then quickly move to the mold for rapid stamping; ) Quenching and cooling the parts at a certain cooling rate, and finally obtain an ultra-high-strength stamping part with a structure of martensite and a strength of about 1500 MPa or even higher. During the operation, the mold needs to be in contact with the heated blank for a long time. When the hot metal is put into the cavity of the hot stam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22B9/18C21D8/00C21D1/26
Inventor 续维张恒尹学炜吴晓春
Owner BAOSTEEL SPECIAL STEEL CO LTD
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