Austenite stainless steel and production method thereof

A technology of austenitic stainless steel and production method, which is applied in the field of stainless steel processing, can solve the problems of low first-grade product rate, impact on service performance, and recessed defective shells, etc., so as to reduce the occurrence of thermally processed surface and edge cracks, reduce The generation of cracks inside and on the surface of the slab, and the effect of improving product quality

Active Publication Date: 2014-07-16
GUANGDONG GUANGQING METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the casting slabs of the above steel types are produced by the continuous casting process, the surface of the continuous casting slabs is prone to dent defects and the growth of the slab shell is uneven. The shell of the primary slab sticks to slag. After the slab runs in the secondary cooling section

Method used

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  • Austenite stainless steel and production method thereof
  • Austenite stainless steel and production method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A kind of austenitic stainless steel, its chemical composition weight percent ratio is: 0.018%, Si: 0.55%, Mn: 1.35%, Cr: 16.7%, Ni: 10.05%, Mo: 2.05%, N: 0.020%, P: 0.035%, S: 0.002%, [S1] B: 30ppm, the rest is Fe and unavoidable impurity elements; its DG=3.49*(Cr+Mo+1.5*Si) -2.5*(Ni+30*C The value of +30*N+0.5*Mn+0.3*Cu)-30.65 is 7.90, and the value of Md30 is -45.6.

[0041] A production method of austenitic stainless steel, comprising the steps of:

[0042] (1) Prepare a slab that meets the above composition requirements, with a DG value of 7.9;

[0043] (2) AOD, LF enhanced deoxidation and desulphurization, total O: 40ppm, S: 20ppm;

[0044] (3) Add a certain amount of Fe-B before LF tapping, and the B content is 30ppm;

[0045] (3) LF ensures good cleanliness of molten steel, soft blowing and sedation time of 12 minutes;

[0046] (4) The continuous casting superheat is 30°C, the constant casting speed is 1.10m / min, and the secondary cooling water is reduced by...

Embodiment 2

[0052] An austenitic stainless steel, the weight percentage of chemical composition is: C=0.016%, Si: 0.4%, Mn: 1.0%, Cr: 16.5%%, Ni: 10.0%, N: 0.050%, Mo: 2.50%, P =0.0350%, S=0.0025%, B: 20ppm, the rest is Fe and unavoidable impurity elements; DG=6.02, Md30=-35.7.

[0053] A production method of austenitic stainless steel, comprising the steps of:

[0054] (1) Prepare a slab that meets the above composition requirements, and the DG value is between 6.02;

[0055] (2) AOD, LF enhanced deoxidation and desulphurization, total O: 45ppm, S: 15ppm;

[0056] (3) Add a certain amount of Fe-B before tapping LF;

[0057] (3) LF ensures good cleanliness of molten steel, soft blowing and sedation time of 15 minutes;

[0058] (4) The superheat of continuous casting is 20℃, the constant tension is 1.15m / min, and the secondary cooling water is weakly cooled;

[0059] (5) Hot rolling, the heating temperature in the heating furnace is 1300°C, and the furnace temperature is 1230°C; after he...

Embodiment 3

[0064] A kind of austenitic stainless steel, the weight percent of chemical composition is: C=0.015%, Si: 0.6%, Mn: 1.5%, Cr: 18.0%, Ni: 11.0%, N: 0.010%, Mo: 2.00%, P= 0.030%, S≤0.002%, B: 40ppm, the rest is Fe and unavoidable impurity elements; DG=8.30, Md30=-50.

[0065] A production method of austenitic stainless steel, comprising the steps of:

[0066] (1) Prepare a slab meeting the above composition requirements, with a DG value of 8.30;

[0067] (2) AOD, LF enhanced deoxidation and desulphurization, total O: 40ppm, S: 20ppm;

[0068] (3) Add a certain amount of Fe-B before tapping LF;

[0069] (3) LF ensures good cleanliness of molten steel, soft blowing and sedation time of 11 minutes;

[0070] (4) The continuous casting superheat is 40°C, the constant casting speed is 1.1m / min, and the secondary cooling water is weakly cooled;

[0071] (5) Hot rolling, the heating temperature in the heating furnace is 1250°C, and the furnace temperature is 1210°C. After heat defo...

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Abstract

The invention relates to austenite stainless steel and a production method thereof, and belongs to the technical field of stainless steel processing. The stainless steel product mainly comprises the following chemical components in percentage by weight: less than or equal to 0.03 percent of C, 0.4-0.6 percent of Si, 1.0-1.5 percent of Mn, 16.5-18.0 percent of Cr, 10.0-11.0 percent of Ni, 0.010-0.050 percent of N, 2.00-2.50 percent of Mo, less than or equal to 0.040 percent of P, less than or equal to 0.003 percent of S, 20-40ppm of B and the balance of Fe and inevitable impure elements, wherein the DG value is between 6 and 9, the value of Md30 is 30DEG C below zero- 60 DEG C below zero. The production process comprises the following steps: intensively deoxidizing and desulfurizing, adding Fe-B to refine the grain size of an as-cast billet, adding Ca-Si wires into a ladle furnace (LF) and prolonging the time of soft blowing and standing, controlling the superheat degree to be 20-40 DEG C and constant pulling speed of 1.1-1.15m/min; and weakening secondary cooling water, performing hot rolling, cold rolling and thermal treatment, and pickling. By adopting the method, the problem of surface defects occurring in the stainless steel processing process can be alleviated, and the cold rolling yield can be increased.

Description

technical field [0001] The invention relates to an austenitic stainless steel and a production method thereof, in particular to an austenitic stainless steel capable of improving the cold rolling yield and a production method thereof, belonging to the technical field of stainless steel processing. Background technique [0002] The requirement for the use of most stainless steel is to maintain the original appearance of the building for a long time. When determining the type of stainless steel to be selected, the main considerations are the required aesthetic standards, the corrosiveness of the local atmosphere, and the cleaning system to be adopted. In heavily polluted industrial areas and coastal areas, the surface will be very dirty and even rusted, but to obtain the aesthetic effect in the outdoor environment, it is necessary to use nickel-containing stainless steel. Austenitic stainless steel is a type of stainless steel that is widely used. Its output accounts for more...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21D8/00B22D11/16
CPCY02P10/20
Inventor 田伟光何丛珍伍崇华
Owner GUANGDONG GUANGQING METAL TECH
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