Manufacturing method for coarse-grain austenitic heat-resistance steel material

An austenitic heat-resistant steel and a manufacturing method technology, applied in the field of heat-resistant steel, can solve the problems of high energy consumption, cumbersome heat treatment process, and long production cycle, and achieve high energy consumption, shortened production cycle, and long production cycle. Effect

Active Publication Date: 2014-06-11
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the traditional process has a long production cycle, cumbersome heat treatment process, and high energy consumption. The present invention improves this

Method used

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  • Manufacturing method for coarse-grain austenitic heat-resistance steel material
  • Manufacturing method for coarse-grain austenitic heat-resistance steel material
  • Manufacturing method for coarse-grain austenitic heat-resistance steel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The material in this example is austenitic heat-resistant steel S31042, which adopts the processing route of vacuum smelting and casting → billet opening → boring → heating → extrusion → heat preservation or heating → water cooling, and the extrusion deformation is 75%. The extruding temperature is 1180°C, rapidly raised to 1230°C and kept for 5 minutes, then quenched and cooled immediately to obtain a complete austenite structure with a grain size of 0-1.

Embodiment 2

[0026] The material in this example is austenitic heat-resistant steel S31025, which adopts the processing route of vacuum melting and casting → billet opening → boring → heating → extrusion → heat preservation or heating → water cooling, the cumulative extrusion deformation is 60%, and the final The extruding temperature is 1200°C, moved to a heat treatment furnace and raised to 1220°C for 10 minutes, then quenched and cooled immediately to obtain a complete austenite structure with a first-grade grain size.

Embodiment 3

[0028] The material in this example is Sanicro25 (22Cr25NiWCoCu), which adopts the processing method of vacuum casting → billet opening → heating → forging → heat preservation or heating → water cooling, the cumulative deformation is 30%, the final forging temperature is 1100 °C, and the temperature is quickly moved to 1200 °C In the heat treatment furnace, keep warm for 15 minutes and quench water to obtain an austenite structure with a 4-grade grain size.

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Abstract

The invention relates to a manufacturing method for a coarse-grain austenitic heat-resistance steel material, and belongs to the technical field of heat-resistance steel. The manufacturing method comprises the following steps: austenitic heat-resistance steel tubular products and bars are used, wherein the grain sizes of the austenitic heat-resistance steel tubular products are greater than ASTM (American Society for Testing Material) standard 4-level grain size; when the heat-resistance steel tubular product with a ratio of the wall thickness to the inner diameter being 0.2-1.3, the forming through extrusion is directly carried out, and a processing technology of casting, cogging, boring, heating, extruding, heat preservation or hyperthermic treatment and water cooling are adopted; metal bars with coarse-grain austenitic tissues are produced, and a processing technology of casting, cogging, heating, forging, heat preservation or hyperthermic treatment and water cooling is adopted. Technical parameters for controlling are as follows: after the hot extrusion or hot forging deformation is 30%-95%, the final extrusion or final forging temperature is between 1050 DEG C and 1250 DEG C, and the heat preservation is carried out for 2min to 20min and then the water cooling is carried out in a thermal treatment furnace at the temperature of 1150-1250 DEG C. The coarse austenitic tissues with the grain size of greater than the ASTM standard 4-level grain size are obtained.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant steel, and in particular relates to a method for manufacturing a coarse-grained austenitic heat-resistant steel material, which is suitable for the production of austenitic heat-resistant steel boiler tubes with coarse-grained structures for the construction of ultra-supercritical thermal power units It is also suitable for the manufacture of other metal parts with coarse-grained austenite structure used under high temperature conditions. Background technique [0002] With frequent occurrence of extreme weather, energy conservation and emission reduction have attracted more and more attention from all over the world. As a large energy consumer, the power generation industry has an arduous task of energy conservation and emission reduction. Increasing the steam temperature and pressure can significantly improve the thermal efficiency of the coal-fired generator set. The thermal efficiency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/04B21C37/06C21D8/00
Inventor 刘正东王敬忠包汉生杨钢
Owner CENT IRON & STEEL RES INST
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