Heat treatment method for steel

A heat treatment method and steel technology, applied in the field of metallurgy, can solve problems such as reducing the quality of heat treatment products, and achieve the effects of good hot hardness and high wear resistance

Inactive Publication Date: 2016-09-07
江苏金基特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The quenching method in the prior art is not good for quenching with ordinary solutions, and it is easy to reduce the quality of heat-treated products

Method used

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  • Heat treatment method for steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The steel is heated to 860°C for 1 hour, cooled to 720°C for 2 hours; then general annealing is performed, cooled to below 550°C and released from the furnace, and then the first preheating is to raise the temperature to 600°C and hold for 2 hours; the second preheating The heat was raised to 800°C and held for 2 hours. The temperature is raised to 1220°C for 0.5 hours, and then quenched. The quenching medium is a mixture of white oil, sodium nitrate, and sodium nitrite (the mass ratio of white oil: sodium nitrate: nitrous acid is 10:1:2), and immediately after quenching For tempering, the first tempering is 560°C for 1 hour; the second tempering is 550°C for 1.5 hours; the third tempering is 560°C for 1 hour.

Embodiment 2

[0014] Heating the steel to 860°C for 1 hour, cooling to 750°C for 2 hours; then performing general annealing, cooling to below 550°C, and then the first preheating is to raise the temperature to 650°C and hold for 2 hours; the second preheating The heat is raised to 850°C and maintained for 2 hours. The temperature is raised to 1220°C for 0.5 hours, and then quenched. The quenching medium is a mixture of white oil, sodium nitrate, and sodium nitrite (the mass ratio of white oil: sodium nitrate: nitrous acid is 10:1:2), and immediately after quenching For tempering, the first tempering is 560°C for 1 hour; the second tempering is 550°C for 1.5 hours; the third tempering is 560°C for 1 hour.

Embodiment 3

[0016] Heating the steel to 880°C for 2 hours, cooling to 720°C for 2 hours; then performing general annealing, cooling to below 550°C, and then the first preheating is to raise the temperature to 600°C and hold for 2 hours; the second preheating The heat was raised to 800°C and held for 2 hours. The temperature is raised to 1280°C for 1 hour, and then quenched. The quenching medium is a mixture of white oil, sodium nitrate, and sodium nitrite (the mass ratio of white oil: sodium nitrate: nitrous acid is 10:1:2). Immediately after quenching For tempering, the first tempering is 560°C for 1 hour; the second tempering is 550°C for 1.5 hours; the third tempering is 560°C for 1 hour.

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Abstract

The invention discloses a heat treatment method for steel. The heat treatment method includes the steps that the steel is heated to 860 DEG C to 880 DEG C, the temperature is kept for 1 hour to 2 hours, and the steel is taken out from a furnace after being subjected to isothermal annealing and general annealing; then the obtained steel is preheated twice, the temperature rises to 1,220 DEG C to 1,280 DEG C and is kept for 0.5 hour to 1 hour, and quenching is conducted; and tempering is conducted immediately after quenching, and tempering is conducted for three times. The steel treated through the heat treatment method is suitable for manufacturing tools; and due to the fact that the steel has good heat hardness and wear resistance and higher strength and toughness, the tools with the high cutting speed can be manufactured, and the cutting tools which can bear the large load and are complex in shape can be manufactured as well.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a heat treatment method for steel. Background technique [0002] The quenching of steel is to heat the steel to a certain temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to melt all or part of the austenite, and then cool it at a rate greater than the critical cooling rate. A heat treatment process in which the cooling rate is rapidly cooled to below Ms (or isothermal near Ms) for martensite (or bainite) transformation. Usually, the solid solution treatment of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials or the heat treatment process with rapid cooling process is called quenching. [0003] The quenching method in the prior art is not good for quenching with ordinary solutions, and the quality of heat-treated products is likely to be reduced. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/26C21D1/34C21D1/18C21D1/58C21D1/607
CPCC21D6/00C21D1/18C21D1/26C21D1/34C21D1/58C21D1/607
Inventor 张斌
Owner 江苏金基特钢有限公司
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