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Die steel billet and preparation method thereof

A technology of die steel and steel billet, which is applied in the field of die steel billet and its preparation, can solve the problems of high production cost and achieve the effects of strong practicability, good corrosion resistance and good application prospects

Active Publication Date: 2020-10-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a mold steel slab and its preparation method to solve the problem in the prior art that rare earth elements and a large amount of alloy elements need to be added in order to improve the overall performance of the mold steel, resulting in excessively high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] The invention also provides a method for preparing the mold steel slab, which includes the following steps: smelting the molten steel with the chemical composition and casting it into a slab.

[0052] In the smelting process of existing die steel, the nitrogen content of the obtained billet is relatively high, generally more than 120ppm. The ability to control nitrogen is extremely limited; 2. Aluminum is usually used as a deoxidizer during deoxidation, which can easily cause the alloyed molten steel to absorb nitrogen again; 3. During the smelting process, the dissolution of nitrogen in steel will gradually increase with the increase of temperature. Due to the high nitrogen content in the billet, it will have a significant adverse effect on the mechanical properties of the die steel.

[0053] The invention adopts the method of EBT electric furnace+LF furnace+VD smelting, and can make the nitrogen content of molten steel ≤30ppm. The casting method is adopted during cas...

Embodiment 1

[0055] Embodiment 1 The preparation of mold steel billet of the present invention

[0056] 1) EBT electric furnace smelting:

[0057] a) Choose high-quality raw materials. Scrap steel should use as much good steel scrap (preferably the return material of this group) or high-quality pig iron as possible. It is required that not only the content of S and P in the scrap steel should be low, but also other harmful elements As and Sn should be strictly controlled. , Pb and Cu, etc. Smelting by oxidation method should ensure the amount of carbon removal during the oxidation period, oxidative decarburization (decarburization amount ≥ 0.4%). It is required to achieve high-temperature oxidation (oxidation temperature ≥ 1580 ° C), violent boiling, and boiling time ≥ 8 minutes during the oxidation period, so as to facilitate the floating of harmful gases and inclusions in the steel. Dephosphorization to below 0.008% at low temperature (1550-1680°C).

[0058] b) High-quality erosion-re...

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PUM

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Abstract

The invention relates to a die steel billet and a production method thereof and belongs to the technical field of die steel products with an aim to solve the problem that rare earth elements and a large number of alloying elements are needed to improve the overall performance of die steel leading to excessively high production cost. The technical scheme includes that the die steel billet is prepared from, by weight, 0.45-1.05% of C, 16-19% of Cr, 1.3-1.8% of Co, 0.3-0.7% of Mn, 0.15-0.40% of Si, 0.9-1.1% of Mo, 0.8-1.0% of Ni, 0.15-0.4% of V, 0.1-0.5% of Ti and the balance of Fe, wherein P issmaller than or equal to 0.020%, S is smaller than or equal to 0.012%, N is smaller than or equal to 0.0045%. The die steel produced from the die steel billet is good in comprehensive mechanical properties and wide in application prospect.

Description

technical field [0001] The invention relates to a die steel billet and a preparation method thereof, belonging to the technical field of die steel products. Background technique [0002] Home appliance parts, mechanical and electrical industry parts, rubber products, ceramic products, plastic products, etc. are mostly formed by molds. Therefore, molds determine the quality, efficiency and product development capabilities of products to a large extent. However, due to the influence of complex factors such as high temperature, pressure, and stress for a long time, mold failures often occur, mainly in the form of shape changes, dimensional tolerances, etc., and its basic failure forms are: surface wear and corrosion, Breakage, deformation and accidental damage to molds. Therefore, good mold steel needs to have high wear resistance, corrosion resistance, strength, hardness and other properties. Among them, plastic mold steel, as the variety with the largest output and the larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/52C22C38/44C22C38/46C22C38/50C22C33/06
CPCC22C33/06C22C38/02C22C38/04C22C38/44C22C38/46C22C38/50C22C38/52
Inventor 罗许李俊洪刘序江肖强
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD