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Hot rolling process for thinning high manganese austenitic steel grains

A technology of austenitic steel and process method, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of insignificant grain refinement, difficult recrystallization multiple times, narrow deformation temperature range, etc. , to achieve the effect of small grain size, small rolling deformation resistance and uniform distribution

Inactive Publication Date: 2014-05-21
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high rolling temperature and narrow deformation temperature range, although multi-pass rolling is used, the effect of grain refinement through dynamic recrystallization mechanism is not significant, and it is difficult to trigger multiple recrystallization, so the grains are only A certain degree of refinement occurs

Method used

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  • Hot rolling process for thinning high manganese austenitic steel grains
  • Hot rolling process for thinning high manganese austenitic steel grains
  • Hot rolling process for thinning high manganese austenitic steel grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 24Mn1Cr2Si0.1N high-manganese austenitic steel with a thickness of 10mm was heated to 1200°C at a heating rate of 100°C / min, kept for 1 hour, and then cooled to 1050°C to start the first rolling pass. Rolling parameters For: deformation rate 0.006s -1 , The reduction is 20%. After an interval of 5s, the second rolling pass is carried out, and the rolling parameters are: deformation rate 0.2s -1 , The reduction is 40%. The third rolling pass is carried out after an interval of 5s, and the rolling parameters are: deformation rate 2s -1 , The reduction is 30%. The final rolling temperature is controlled above 950°C, and water is sprayed rapidly after rolling for cooling. The average grain size obtained by the above three-pass rolling is about 5 μm (such as image 3 shown), which is similar to the structure of the unrolled sheet (such as figure 1 As shown), the grains are significantly refined; and compared with the structure of one-time rolling in the prior art (such...

Embodiment 2

[0025] The Fe-38Mn high-manganese austenitic steel with a thickness of 10mm was heated to 1250°C at a heating rate of 100°C / min, kept for 1 hour, and then cooled to 1000°C to start the first rolling pass. Rolling parameters For: deformation rate 0.007s -1 , The reduction is 20%. After an interval of 5s, the second rolling pass is carried out, and the rolling parameters are: deformation rate 0.4s -1 , The reduction is 40%. The third rolling pass is carried out after an interval of 5s, and the rolling parameters are: deformation rate 4s -1 , The reduction is 30%. The final rolling temperature is controlled above 950°C, and water is sprayed rapidly after rolling for cooling. The average grain size obtained by the above three-pass rolling is about 8 μm (such as Figure 5 shown), which is similar to the structure of the unrolled sheet (such as Figure 4 As shown), the grains are significantly refined.

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Abstract

The invention relates to a hot rolling process for thinning high manganese austenitic steel grains. The process adopts high manganese austenitic steel with the manganese content of 12-40 percent and nitrogen content of 0-0.4 percent; according to the process, the high manganese austenitic steel is heated to 1150-1250 DEG C with the heating speed of 100 DEG C / min, thermally insulated for one hour, and then cooled to 1000-1050 DEG C to start the first pass rolling, the deformation rate is 0.005-0.008s<-1>, and the rolling reduction is 20 percent; after an interval of 5 s, the second pass rolling starts with the deformation rate of 0.1-0.5 s<-1> and the rolling reduction of 40 percent; after an interval of 5 s, the third pass rolling starts with the deformation rate of 1-5 s<-1> and the rolling reduction of 30 percent; the finishing temperature is controlled above 950 DEG C, and water is quickly sprayed for cooling after rolling. High manganese austenitic steel undergoes hot rolling of three times with different rolling reductions and different strain rates to cause a plurality of complete recrystallization with the grain size fined from 100mu m to 4-10mu m, so that ultra-fine grain high manganese austenitic steel is obtained.

Description

Technical field: [0001] The invention belongs to the field of alloy steel production, and in particular relates to a hot rolling process for refining grains of high manganese austenitic steel. Background technique: [0002] High manganese austenitic steel is a kind of alloy steel with a wide range of uses. For example, typical Mn13 steel is mainly used in the manufacture of wear-resistant components in construction and mining machinery; high manganese and nitrogen-containing austenitic steel can replace traditional nickel-containing Austenitic stainless steel is mainly used in various fields of corrosion resistance, low temperature and bioengineering. The high-manganese carbon-based twin-induced plasticity steel with high strength and high impact absorption energy has shown great application potential in rail transportation and other fields. The remarkable feature of the above-mentioned types of high manganese steel is that it has a relatively stable single-phase austenite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00B21B37/00
Inventor 付瑞东李艺君
Owner YANSHAN UNIV
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