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Die steel and preparation method thereof

A technology of die steel and steel ingot, which is applied in the field of die steel, can solve the problem of high cost of easy chipping, and achieve the effect of improving toughness and wear resistance

Inactive Publication Date: 2019-09-06
HEYE SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the disadvantages of high-load woodworking knives that are prone to chipping and high cost during use, the invention provides a mold steel for woodworking knives, which has excellent wear resistance, toughness and machinability, and is very easy to obtain fine-grained steel after quenching. Organization, less costly to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A die steel, comprising the following components in mass percentage: 0.68% of C, 0.50% of Si, 0.30% of Mn, 0.025% of P, 0.010% of S, 6.50% of Cr, 4.50% of Mo, 2.80% W, 0.80% V, 2.80% Co, 0.13% Nb, 0.35% Ni, the balance is iron and unavoidable impurities.

[0026] A method for preparing mold steel, comprising the following steps:

[0027] (1) Use a neutral crucible to melt the alloy and return materials and pour them into a ladle, refining outside the LF furnace, vacuum degassing in a VD furnace and pouring them into R120 electrode rods, and then smelting by electroslag remelting or continuous cooling ingot-pulling electroslag Melting and smelting into φ315 electroslag ingot.

[0028] (2) The steel ingot is annealed, and the steps of the annealing process are as follows:

[0029] 1) Put the flat steel into a heating furnace, heat up to 780°C at a rate of 90-100°C / h, and keep it warm for 6-8h;

[0030] 2) raising the temperature of the electroslag ingot to 880-890°C at...

Embodiment 2

[0038] A die steel comprising the following components in mass percent: 0.70% C, 0,45% Si, 0.30% Mn, 0.025% P, 0.010% S, 6.50% Cr, 4.60% Mo, 3.00% W, 0.80% V, 3.00% Co, 0.15% Nb, 0.40% Ni, the balance being iron and unavoidable impurities.

[0039] A method for preparing mold steel, comprising the following steps:

[0040] (1) Use a neutral crucible to melt the alloy and return materials and pour them into a ladle, which is refined outside the ESF furnace and sprayed into a steel ingot.

[0041] (2) The steel ingot is annealed, and the steps of the annealing process are as follows:

[0042] 1) Put the flat steel into a heating furnace, heat up to 780°C at a rate of 90-100°C / h, and keep it warm for 6-8h;

[0043] 2) raising the temperature of the electroslag ingot to 880-890°C at a rate of 90-100°C / h, and keeping it warm for 5.5-7h;

[0044] 3) Rapid cooling of the flat steel to 800°C at a rate of ≥50°C / h;

[0045] 4) Slowly drop the flat steel from 800°C to 680°C for 9-11 ...

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Abstract

The invention discloses die steel which is characterized by comprising the following chemical components in percentage by mass: 0.65-0.72% of C; 0.40 to 0.60 percent of Si; 0.25 to 0.40 percent of Mn;less than or equal to 0.025% of p; less than or equal to 0.010% of S; 6.00%-6.80% of Cr, 4.20%-4.80% of Mo, 2.60%-3.50% of W, 0.70%-0.90% of V, 2.60%-3.20% of Co, 0.10%-0.15% of Nb, 0.30%-0.40% of Niand the balance of iron and inevitable impurities. The C content is increased, the Mo content is increased, the W element is added, the Co element is added, the Nb element is added for modification treatment, after the Ni element is added, the toughness and wear resistance of the material are improved, and the service life is prolonged by 15-20% compared with an existing material.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a die steel and a preparation method thereof. Background technique [0002] The rotational speed of the rotary cutting cutter head of the forestry rotary sheet machine is as high as hundreds or thousands of revolutions per minute. The wood fiber structure is tough and uneven, the elastic recovery is large, and the thermal conductivity is poor. The working condition of the cutting blade is very bad. The failure modes are wear and early failure. Among them, abrasion is more common. When the blade is working, the cutting edge and the wood tissue are in high-speed contact and extrusion, and the strong friction generates high heat, which makes the blade over-tempered, and the organic matter in the wood also takes the opportunity to combine with the alloy elements to form an organometallic compound. Therefore, wear is caused by mechanical, overheating and chemical The comprehensiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/52C22C38/48C22C38/46C22C38/44C22C38/04C22C38/02C22C33/04C21D1/26C21D1/18C21D1/58
CPCC21D1/18C21D1/26C21D1/58C22C33/04C22C38/002C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C38/52
Inventor 李栋
Owner HEYE SPECIAL STEEL