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Injection molding based preparation method of cobalt-free high-speed steel

A spray-forming, cobalt high-speed steel technology, applied in the field of iron and steel metallurgy, can solve the problems of complex powder metallurgy process, low yield of powder metallurgy materials, and large size requirements of atomization devices, and achieves the elimination of numerous processes, reduction of use prices, The effect of improving various performances

Inactive Publication Date: 2014-05-14
WUXI JINDANG MACHINERY FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of powder metallurgy is quite complicated, including: melting, atomization, screening, mixed batch, packaging, cold isostatic pressing, hot isostatic pressing, hot forging or hot rolling, contact packaging, heat treatment and other processes
During these processes, expensive investment in equipment such as hot isostatic pressing is required, and the size requirements of the atomization device are relatively large, and the yield of powder metallurgy materials is relatively low, and the energy utilization rate is relatively low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of cobalt-free high-speed steel by injection molding. The chemical composition of the high-speed steel consists of the following components in weight percentage: C 1.5%, Cr 4.8%, Mo 4.8%, W 7.4%, V 3.2%, Nb 1.0 %, Ti 0.2%, Si 0.7%, Mn 0.1%, N 0.1%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0028] 1) Batching process: batching according to the composition of the alloy;

[0029] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace in the melting chamber of the atomization deposition equipment and heat to 1710°C higher than the melting point of the alloy, and keep it warm for 20 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform Consistent, then pour the high-speed steel melt into the heated tundish, the temperature of the tundish is 1700℃ higher than the melting point of high-speed steel; ...

Embodiment 2

[0036] A method for preparing cobalt-free high-speed steel by injection molding. The chemical composition of the high-speed steel consists of the following components in weight percentage: C 1.7%, Cr 4.4%, Mo 5.2%, W 7.0%, V 3.6%, Nb 0.6 %, Ti 0.4%, Si 0.5%, Mn 0.3%, N 0.06%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0037] 1) Batching process: batching according to the composition of the alloy;

[0038] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace in the melting chamber of the atomization deposition equipment and heat to 1730°C higher than the melting point of the alloy, and keep it warm for 10 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform Consistent, then pour the high-speed steel melt into the heated tundish, the temperature of the tundish is higher than the melting point of high-speed steel at 1720...

Embodiment 3

[0045] A preparation method of cobalt-free high-speed steel by injection molding. The chemical composition of the high-speed steel consists of the following components in weight percentage: C 1.6%, Cr 4.6%, Mo 5.0%, W 7.2%, V 3.4%, Nb 0.8 %, Ti 0.3%, Si 0.6%, Mn 0.2%, N 0.08%, S≤0.03%, P≤0.03%, and the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0046] 1) Batching process: batching according to the composition of the alloy;

[0047] 2) Melting process: Put the mixed ingredients into the vacuum induction furnace in the melting chamber of the atomization deposition equipment and heat it to 1720°C higher than the melting point of the alloy, and keep it warm for 15 minutes to make the composition and temperature of the high-speed steel melt in the induction furnace uniform Consistent, then pour the high-speed steel melt into the heated tundish, the temperature of the tundish is higher than the melting point of high-speed steel at ...

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Abstract

The invention discloses an injection molding based preparation method of cobalt-free high-speed steel. The high-speed steel comprises the following chemical components in percentage by weight: 1.5 to 1.7% of C, 4.4 to 4.8% of Cr, 4.8 to 5.2% of Mo, 7.0 to 7.4% of W, 3.2 to 3.6% of V, 0.6 to 1.0% of Nb, 0.2 to 0.4% of Ti, 0.5 to 0.7% of Si, 0.1 to 0.3% of Mn, 0.06 to 0.1% of N, not greater than 0.03% of S, not greater than 0.03% of P, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: 1) batching; 2) melting; 3) performing injection molding; 4) carrying out air cooling; 5) annealing; 6) performing hot forging; and 7) quenching and tempering.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a spray forming preparation method of cobalt-free high-speed steel. Background technique [0002] High-speed steel is a kind of high-alloy steel, which has high thermal hardness after heat treatment. When the cutting temperature is as high as 600°C, the hardness does not drop significantly. The cutting speed of the tool made by it can reach more than 60 meters per minute, and its hardness is 63- 65HRC. However, high-speed steel usually contains Co element, and because Co is expensive, high-speed steel is expensive. [0003] There are two manufacturing methods for high-speed steel, one is traditional ingot casting, and the other is manufacturing by powder metallurgy. Ingot casting is usually divided into two types: secondary refining (EAF+LF+VD) or electroslag remelting (ESR). In the above method, due to the slow cooling of the molten metal, the uneven segregat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/00B22F3/115
Inventor 谈祁祥
Owner WUXI JINDANG MACHINERY FACTORY
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