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Heating technique for refining 50 steel austenite grains

A technology of austenite grain and heating process, applied in heat treatment furnaces, manufacturing tools, heat treatment equipment, etc., can solve problems such as long holding time, limited effect of grain refinement, and insufficient homogenization of austenite, achieving Low cost, little impact on the production process, and easy promotion

Inactive Publication Date: 2015-07-08
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned process has problems such as insufficient austenite homogenization, long holding time, and limited effect of grain refinement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The 50 steel bar (round bar, diameter 10mm) is rapidly heated by electric contact (heating rate: 0.5°C / s) to 1050°C for 5s, then graded cooling + short-term heat preservation, first rapid cooling (cooling rate: 1°C / s) to 1000°C for 5s, then rapid cooling (cooling rate of 2°C / s) to 930°C for 5s, continued rapid cooling (cooling rate of 1°C / s) to 870°C for 5s, and finally rapid cooling (cooling The speed is 1°C / s) to 820°C for 360s, and then stand and cool in the air to complete the heating process for refining the austenite grains of 50 steel.

Embodiment 2

[0016] The 50 steel bar (round bar, diameter 25mm) is rapidly heated in a trolley-type electric furnace (heating rate: 2°C / s) to 1050°C for 5 seconds, then graded cooling + short-term heat preservation, first rapid cooling (cooling rate: 2°C / s) to 950°C for 5s, then rapid cooling (cooling rate of 1°C / s) to 900°C for 5s, continued rapid cooling (cooling rate of 1°C / s) to 850°C for 5s, and finally rapid cooling (The cooling rate is 1°C / s) to 790°C for 2600s, and then stand and cool in the air to complete the heating process for refining the austenite grains of 50 steel.

Embodiment 3

[0018] The 50 steel bar (round bar, diameter 30mm) is rapidly heated by induction heating (heating rate: 10°C / s) to 1020°C for 5s, then graded cooling + short-term heat preservation, and first rapidly cooled (cooling rate: 1°C / s) to 950°C for 5s, then rapid cooling (cooling rate of 1°C / s) to 900°C for 5s, continued rapid cooling (cooling rate of 1°C / s) to 850°C for 5s, and finally rapid cooling (cooling The speed is 1°C / s) to 810°C for 2000s, and then left to cool in the air to complete the heating process for refining the austenite grains of 50 steel.

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PUM

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Abstract

The invention discloses a heating technique for refining 50 steel austenite grains. By adopting the electric contact heating, induction heating or any other quick heating means and the stage cooling and short-time holding process, the technique can solve the problems of insufficient uniformization, long holding time, limited refined grain effect and the like in the 50 steel in the traditional heat treatment for treating austenite grains. The technique is mainly characterized in that the heating technique of quick heating, stage cooling and short-time holding adopted in the heating process can effectively refine the austenite grains to ASTM Grade 10-14. Meanwhile, the method is simple in process, does not need to add any complex device, is lower in cost, does not have great influence on the production process and is convenient for popularization.

Description

technical field [0001] The invention belongs to the technical field of general heat treatment of iron and steel materials, and in particular relates to a heating process method for refining 50 steel austenite grains. Background technique [0002] 50 steel is a medium-carbon high-quality carbon structural steel. It is usually used in the quenched and tempered or normalized state. It has good comprehensive mechanical properties and is widely used in the manufacture of shafts, gears and other parts. In quenching and tempering or normalizing, in order to obtain good toughness and hardness and other performance requirements, it is hoped that a fine austenite grain size can be obtained during heating. Factors affecting the austenite grain size include heating system and original structure, so the traditional heat treatment process for refining the austenite grain size of 50 steel includes rapid heating and short-term heat preservation, lowering the heating temperature and cyclic h...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D9/00
Inventor 亓海全焦慧彬周伍
Owner GUILIN UNIVERSITY OF TECHNOLOGY