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High strength austenite steel crystal fining method and miter angle extruding deforming mould

An equal-diameter angular extrusion, austenitic steel technology, applied in the field of alloy steel production, can solve the problems of improving strength, refining grains, limited strength improvement, etc., to achieve the effect of maintaining toughness and improving strength

Inactive Publication Date: 2005-03-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, since there is no phase transformation in austenitic stainless steel, it is impossible to improve the strength by refining the grains through the heat treatment process. In order to improve the strength of austenitic stainless steel, one method is to add alloying elements. To achieve the purpose of solid solution strengthening or precipitation strengthening, but this method increases the cost, and the increase in strength is limited. The other is to use forging or cold deformation to refine the grains and achieve the purpose of increasing strength, but This process will change the dimensions of the original finished steel, especially cold deformation is only suitable for the preparation of wire and strip

Method used

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  • High strength austenite steel crystal fining method and miter angle extruding deforming mould
  • High strength austenite steel crystal fining method and miter angle extruding deforming mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The material used for the mold of the utility model is ultra-high-strength steel with a grade of T250, and the material used for the extrusion rod is ultra-high-strength steel with a grade of C350. The test material is 0Cr19Ni9N austenitic stainless steel. The process parameters of the mold are shown in Table 1. After one round of equal diameter angular extrusion deformation and annealing at 800-1000°C for 40 minutes, the changes in grain size are shown in Table 2. The comparison table of mechanical properties between Example 1 and the original bar is shown in Table 3. In the above list, serial numbers 1-4 are embodiment 1 of the present invention, and serial numbers 5-6 are original rods.

[0014] Table 1 is the processing parameters of the mold used in Example 1 of the present invention

[0015] serial number

inner corner

Ф°

outside corner

ψ°

Extrusion Rod Yield Strength

Spend

MPa

...

Embodiment 2

[0022] The material used for the mold of the utility model is ultra-high-strength steel with a grade of T250, and the material used for the extrusion rod is ultra-high-strength steel with a grade of C350. The test material is 00Cr18Ni10Mn2 austenitic stainless steel. The process parameters of the mold are shown in Table 4. After one pass of equal-diameter angular extrusion deformation and annealing at 800-1000°C for 40 minutes, the grain size changes are shown in Table 5. The comparison table of mechanical properties between Example 1 and the original bar is shown in Table 6. In the above list, serial numbers 1-4 are embodiment 1 of the present invention, and serial numbers 5-6 are original rods.

[0023] Table 4 is the process parameter of the utility model embodiment 2 mold

[0024] Preface

No

inner corner

Ф°

outside corner

ψ°

Extrusion Rod Yield Strength

MPa

Yield strength of bar

MPa

...

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Abstract

The present invention belongs to the field of alloy steel production, and especially crystal fining method for high strength austenite steel. The method features that austenite steel is processed through one or two gates of miter angle extruding deformation, and annealing heat treatment at 800-1000 deg.c for 20-120 min to re-crystallize completely and fine crystal size from 120 microns to 2-10 microns. The miter angle extruding deformation mold is one L-shaped elbow pipe with inner angle of 90-120 deg and outer angle of 20-60 deg; the extruding rod has yield strength over 1.5 times that of the extruded rod material; and the tolerance of the extruded rod material diameter to the inner diameter of the elbow pipe is 0.02-0.05 mm. Compared with available technology, the present invention has the advantages of raising the strength of austenite steel and maintaining the toughness while maintaining the size of the austenite steel.

Description

technical field [0001] The invention belongs to the field of alloy steel production, and in particular relates to a grain refinement method and an equal-diameter angular extrusion deformation die for improving the strength of austenitic steel and maintaining toughness without changing the cross-sectional size of the steel. Background technique [0002] In the prior art, since there is no phase transformation in austenitic stainless steel, it is impossible to improve the strength by refining the grains through the heat treatment process. In order to improve the strength of austenitic stainless steel, one method is to add alloying elements. To achieve the purpose of solid solution strengthening or precipitation strengthening, but this method increases the cost, and the increase in strength is limited. The other is to use forging or cold deformation to refine the grains and achieve the purpose of increasing strength, but This process changes the dimensions of the original finis...

Claims

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Application Information

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IPC IPC(8): C21D8/00
Inventor 杨钢刘正东王立民林肇杰程世长李密
Owner CENT IRON & STEEL RES INST
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