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High-speed tool steel wire vacuum heat treatment technique

A vacuum heat treatment, high-speed tool steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of steel wire nitriding, reduce weldability, affect welding quality, etc., achieve tight contact, prevent nitriding, improve The effect of welding quality

Inactive Publication Date: 2008-04-30
东北特钢集团大连特殊钢制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The foreign high-speed tool steel wire vacuum annealing process is filled with nitrogen in the high-temperat

Method used

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  • High-speed tool steel wire vacuum heat treatment technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: High-speed tool steel M42 steel wire, φ4.9mm, 482kg, cleaned with a sealing solution, which neither corrodes the steel wire substrate nor prevents the surface oxidation of the steel wire. The two Roots pumps of the vacuum annealing furnace can use one of the Roots pumps in turn to adjust the vacuum at any time as needed. Adjust the vacuum degree of vacuum annealing to 2×10 -2 Pa~3×10 -1 Pa, start to heat the steel wire for 60 minutes to 605°C for 30 minutes, then heat for 30 minutes to 850°C for 270 minutes, then adjust the vacuum degree to 2×10 -1 Pa~3×10 -1 Pa, cool down to 597°C at a cooling rate of 25°C / hour, and then start to fill the furnace with nitrogen at two atmospheric pressures to circulate and cool when the furnace cools to 350°C, and then cool down to 60°C and leave the furnace. The whole cycle of vacuum annealing is 24-27 hours. The steel wires out of the furnace are drawn and rolled into flat wires, and finally the flat wires and alloy spr...

Embodiment 2

[0023] Example 2: High-speed tool steel M3 steel wire, φ3.0mm, 490kg, cleaned with a sealing solution, which neither corrodes the steel wire substrate nor prevents the surface oxidation of the steel wire. After drying and sealing, it is installed in a furnace for vacuum annealing. The two Roots pumps of the vacuum annealing furnace can use one of the Roots pumps in turn to adjust the vacuum at any time as needed. Adjust the vacuum degree of vacuum annealing to 2×10 -2 Pa~3Pa, start to heat the steel wire for 60 minutes to 600°C for 30 minutes, then heat for 30 minutes to 850°C for 270 minutes, then adjust the vacuum degree to 2×10 -1 Pa~3×10 -1 Pa, cool down to 604°C at a cooling rate of 25°C / hour, and then start to fill the furnace with nitrogen at two atmospheric pressures to circulate and cool when the furnace cools to 398°C, and then cool down to 60°C and leave the furnace. The whole cycle of vacuum annealing is 22-24 hours. The steel wires out of the furnace are drawn ...

Embodiment 3

[0024] Example 3: High-speed tool steel M2 steel wire, φ1.5mm, 502kg, cleaned with a sealing solution, which neither corrodes the steel wire substrate nor prevents the surface oxidation of the steel wire. The two Roots pumps of the vacuum annealing furnace can use one of the Roots pumps in turn to adjust the vacuum at any time as needed. Adjust the vacuum degree of vacuum annealing to 2×10 -2 Pa~3Pa, start to heat the steel wire for 60 minutes to 596°C for 30 minutes, then heat for 30 minutes to 820°C for 270 minutes, then adjust the vacuum degree to 2×10 -1 Pa~3×10 -1Pa, cool down to 602°C at a cooling rate of 25°C / hour, and then start to fill the furnace with two atmospheres of nitrogen to circulate and cool when the furnace cools to 370°C, and then cool down to 60°C and release from the furnace. The whole cycle of vacuum annealing is 22-24 hours. The steel wires out of the furnace are drawn and rolled into flat wires, and finally the flat wires and alloy spring steel str...

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Abstract

The invention relates to a high speed tool steel wire vacuum heat treatment technology, which belongs to the vacuum heat treatment field. The high speed tool steel wire vacuum heat treatment technology comprises high speed tool steel wire cleaning, drying, vacuum annealing, drawing, flat wire rolling, and vacuum welding. The vacuum annealing is performed under the vacuum degree of 2*10<-2>Pa to 3 Pa, after the work piece is heated to 600 plus or minus 5 DEG C for 60 minutes, and the thermal retardation is performed for 30 minutes, and is heated to 820 to 850 DEG C for 30minutes, and the temperature of the work piece is reduced to 600 plus or minus 5 DEG C at the cooling speed of 25 DEG C per hour, when a furnace is cooled at 400 to 350 DEG C, the nitrogen gas of two barometric pressures is filled into the furnace to perform circulation cooling, and the work piece is taken out of the furnace when the temperature is reduced to 60 DEG C; the period of the vacuum annealing is 22 to 27 hours. The invention has the advantages that the surface of the high speed tool steel wire vacuum annealing has no nitrogen leakage, to ensure that the welding seam has no air bubble and no welding missing during the welding; simultaneously the surface has no oxidation and no decarburization, and the size precision is high; The mechanical property and the hardness degree are even.

Description

technical field [0001] The invention relates to a high-speed tool steel wire vacuum heat treatment process, which belongs to the field of vacuum heat treatment. Background technique [0002] Sawing is an indispensable processing method in the machinery manufacturing industry and metallurgical industry. Since the invention of the bimetallic band saw in the United States, the obsolete reciprocating saw and sawing machine have been eliminated, bringing a technological revolution to the sawing industry. Cutting with a band saw greatly improves production efficiency, saves metal materials, and saves energy due to its narrow saw edge, fast speed, and high precision. The key to bimetallic band saws lies in high-quality bimetallic saw blades, which are used to manufacture the high-speed tool steel flat wires required for the composite band teeth of bimetallic saw blades, with high technical content and strict quality requirements. The difference between the high-speed tool steel w...

Claims

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Application Information

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IPC IPC(8): C21D9/52C21D1/26C21D1/773
CPCY02P10/20
Inventor 马肃宁孙立忠滕世海唐传东王海涛
Owner 东北特钢集团大连特殊钢制品有限公司