Large-size mandril structure property control method

A control method and large-scale technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., to achieve the effects of inhibiting the growth of grains, ensuring the quality of quenching, and improving the purity

Active Publication Date: 2010-07-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, according to foreign experience, a professional large-tonnage fast forging machine with dual manipulators is required for the production of slender and large-scale die steel products such as mandrel rods, and there is almost no such professional equipment in China.

Method used

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  • Large-size mandril structure property control method
  • Large-size mandril structure property control method
  • Large-size mandril structure property control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] Embodiment: In this example, the composition and weight percentage of the alloy material that adopts are as follows:

[0020] C 0.39%, Si 0.83%, Mn 0.3%, Cr 5.06%, Mo 1.31%, V 1.01%, P 0.01%, S0.01%, Fe balance.

[0021] The main process steps of the microstructure control technology adopted by this alloy material are as follows:

[0022] 1) Melting is carried out according to the traditional conventional process, that is, arc smelting-ladle refining-electroslag remelting secondary refining. After refining, the electroslag ingot poured out of the smelting is placed in the electroslag remelting device for electroslag remelting .

[0023] 2) Put the steel ingot into a heat treatment furnace within the temperature range of 1250°C for uniform microstructure treatment. Keep warm for 20 hours, melt the eutectic carbide into the material matrix, homogenize the structure, and then bury the sand for cooling.

[0024] 3) Heating the above steel ingot to 1150°C for forging proc...

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Abstract

The invention relates to a large-size steel mandril structure thinning control method for improving the performance of a base body, belonging to the field of steel material manufacturing technique control technology. The method mainly comprises structure thinning treatment for mandril billet in the production process of a mandril by a thigh channel as well as quenching treatment-thinned and hardened structure of finished products of the mandril, namely, all performances of the mandril can be improved by technical way of double thinning structure. The large-size steel mandril manufactured by the method has higher impact toughness, better heat stability and higher thermal fatigue resistance.

Description

technical field [0001] The invention relates to a method for controlling the microstructure of iron and steel mandrel material to improve its performance. The invention belongs to the technical field of iron and steel material manufacturing process control. Background technique [0002] In recent years, my country has introduced a number of MPM production lines. The main consumable mandrel basically relies on imports. The large-diameter mandrel has high technical content and is difficult to manufacture. At present, only a few countries such as France, Italy, and Germany have production capacity. There is a big gap between my country's current mandrel manufacturing capacity and foreign countries, especially for large-diameter mandrels. The manufacture of mandrels with a size above Φ280mm is still blank, and all rely on imports. Imported mandrels are not only expensive, but also have a long delivery cycle. The contradiction is very prominent. [0003] There are two technical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C21D9/38C22C38/24C21D1/26C21D1/18
Inventor 吴晓春闵永安邵光杰陈英伟刘桂彪
Owner SHANGHAI UNIV
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