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Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack

A production process, stainless steel technology, applied in manufacturing tools, temperature control, metal rolling, etc., can solve problems such as hot-rolled plate edge cracks, billet heating temperature, rolling pass deformation and deformation temperature, etc. Achieve the effect of edge crack elimination, good plasticity and high brittleness

Inactive Publication Date: 2011-01-19
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest advantage of the steckel mill is that it can roll difficult-to-deform steels with a narrow deformation temperature range, and can adjust the furnace temperature of the two coiling heating furnaces of the steckel mill to control the final rolling temperature of the rolled piece. Solve the temperature drop of the hot-rolled sheet during the rolling process, but there will be α phase in the structure, the heating temperature of the billet, the deformation amount of the rolling pass and the deformation temperature are not well matched, and the edge cracking of the hot-rolled sheet is very easy to occur

Method used

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  • Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack
  • Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack
  • Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A production process for suppressing edge cracking of a nickel-free austenitic stainless steel hot-rolled plate, the steps are as follows:

[0026] (1) Smelting, continuous casting

[0027] The use of low-cost alloy materials and 100% stainless steel scrap is realized through GOR refining furnace refining. Nitrogen is blown throughout the process, and electrolytic manganese is baked in the furnace for more than 40 minutes. The baking time is reduced or increased depending on the furnace temperature. The blowing time is controlled at 100 minutes. Nitrogen flow inner pipe charging stage 30-35m 3 / min, the first stage 0.5-1.0m 3 / min, furnace tilting stage 25-35m 3 / min, 5-7m in the charging stage of the outer tube 3 / min, furnace tilting stage 5-7m 3 / min, and the use of decarburization and chromium-preserving, gas-phase nitrogen alloying process ensures that the N content in the steel is controlled at 0.119%; the LF furnace is blown with argon throughout the process,...

Embodiment 2

[0039] A production process for suppressing edge cracking of a nickel-free austenitic stainless steel hot-rolled plate, the steps are as follows:

[0040] (1) Smelting, continuous casting

[0041] Refining by the GOR refining furnace realizes the use of low-cost alloy material and 100% stainless steel scrap steel, through process control such as furnace alloy baking, blowing time, gas flow (same as the control in embodiment 1), and adopts decarburization and chromium preservation, The gas-phase nitrogen alloying process technology ensures that the N content in the steel is controlled at 0.13%; the LF furnace is blown with argon throughout the process, and the treatment is at least 15 minutes, so as to uniform the composition and temperature, and finally fine-tune the composition. CaSi cored wire (Ф13mm, powder amount ≥ 220g / m) 3-4m / t, soft argon blowing ≥ 5min after tapping, temperature measurement in the first furnace after soft argon blowing is 1540-1550°C, and then 1530-154...

Embodiment 3

[0053] A production process for suppressing edge cracking of a nickel-free austenitic stainless steel hot-rolled plate, the steps are as follows:

[0054] (1) Smelting, continuous casting

[0055] The N content in the steel is controlled at 0.12% (with the control steps in Example 1); the Creq / Nieq is controlled at 1.29; the α-phase content in the slab structure is guaranteed to be controlled at 3.9%;

[0056] (2) Slab grinding

[0057] The continuous casting slab is ground with 48% pressure, the upper and lower sides of the slab are ground once, the side is not ground, and the grinding amount is less than 1mm;

[0058] (3) Blank heating

[0059] The ground blank is heated in the preheating section, heat recovery section, heating section, and soaking section in turn, and then released from the furnace. The temperature of the heat recovery section is ≤800°C, the temperature of the heating section is 1230±20°C, and the temperature of the soaking section is 1230±20°C. , furnac...

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Abstract

The invention relates to production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack, which comprises the following steps of: smelting and continuous casting, grinding plate blanks, heating blanks, rolling and the like. By controlling N content in steel below 0.13 percent, controlling Creq / Nieq within 1.35, controlling alpha-phase content in a casting blank texture within 4 percent, setting the reasonable heating temperature of plate blanks by combining on-site reality, and adopting the plate blank one-pass descaling box and frame final-pass descaling descaling technology, in particular the rolling technology of tightly combining hot-rolled rolling pass deformation and blank temperature, the production technology has the advantages of avoiding the edge crack of the produced stainless steel hot-rolled plates, obviously improving the yield, solving the problem of edge crack quality for steel coils in the rolling process through a steckel mill, guaranteeing the edge quality of the hot-rolled steel coils and improving the width yield of finished rolled plates.

Description

technical field [0001] The invention relates to a production process of austenitic stainless steel hot-rolled plates, in particular to a process method for suppressing edge cracking of hot-rolled coils during the process of rolling nickel-saving austenitic stainless steels with a steel coil mill. Background technique [0002] Edge cracking of stainless steel hot-rolled sheets is a very common phenomenon and it is difficult to eradicate. At present, domestic austenitic stainless steel manufacturers aim at the edge cracking of austenitic stainless steel hot-rolled sheets produced by hot-tandem rolling mills, and adopt control heating temperature, reduce strip Temperature drop measures during rolling and conveying to avoid edge cracking. [0003] The use of the steel plate rolling mill, on the one hand, is to keep the steel plate rolling at a uniform temperature, and on the other hand, it is to flexibly and economically produce steel plates with a wide range of strength, many v...

Claims

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Application Information

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IPC IPC(8): B21B1/30B21B37/74B21B37/56C21C5/00C21C7/068C21D11/00
Inventor 王永胜陈培敦陈茂敬王俊海岳好明李志平
Owner SHANDONG TAISHAN STEEL GROUP
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