Surface treatment method for 304-series high-grade panel stainless steel raw materials

A surface treatment, stainless steel technology, used in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of unsatisfactory roughness, pit-like defects, and inability to remove iron scales, and achieve uniformity between the operation side and the transmission side. , the effect of roughness reduction and high product quality consistency

Pending Publication Date: 2021-03-16
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, iron scale cannot be removed in the steel plate produced by the traditional process, and there are a large number of honeycomb defects in microscopic observation. Under high temperature, the iron scale grows along the depth of the substrate, and a large number of pit-like defects appear on the surface after pickling, and the roughness cannot meet the requirements.

Method used

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  • Surface treatment method for 304-series high-grade panel stainless steel raw materials
  • Surface treatment method for 304-series high-grade panel stainless steel raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The 304 strip steel raw materials that present embodiment adopts have following element composition (weight %):

[0063] C 0.08%, Si 1.00%, Mn 1.50%, P 0.040%, S 0.020%, Cr 19%, Ni 8.00%, and the rest are Fe and unavoidable impurities.

[0064] The thickness of the 304 strip steel raw material that present embodiment adopts is 3.5mm, and width is 1000mm.

[0065] This embodiment is specifically as follows:

[0066] (1) Annealing process:

[0067] The 304 hot-rolled black leather coils are annealed after being welded by a welding machine. Zone-12 furnace temperature control 1080 ℃.

[0068] (2) Scale-breaking shot blasting process:

[0069] The phosphorus-breaking process uses a large elongation to pass the line, and the test process uses 1.5% elongation. Adjust the shot blasting speed to 1750r / min before crossing the line. The current of the shot blasting machine is stable at 90A, and the speed of the shot blasting head is 1750r / min.

[0070] (3) Pickling process...

Embodiment 2

[0075] The 304 strip steel raw materials that present embodiment adopts have following element composition (weight %):

[0076] C 0.06%, Si 0.8%, Mn 2.00%, P 0.045%, S 0.020%, Cr 18%, Ni 10.50%, and the rest are Fe and unavoidable impurities.

[0077] The thickness of the 304 strip steel raw material that present embodiment adopts is 5.0mm, and width is 1250mm.

[0078] This embodiment is specifically as follows:

[0079] (1) Annealing process:

[0080] 304 hot-rolled black leather coils are annealed after being welded by a welding machine. The low-temperature annealing process is adopted. The line-passing speed TV is set at 130mm×m / min. Zone-12 furnace temperature control 1065 ℃.

[0081] (2) Scale-breaking shot blasting process:

[0082] The phosphorus-breaking process uses a large elongation to pass the line, and the test process uses 1.8% elongation. Adjust the shot blasting speed to 1720r / min before crossing the line. The current of the shot blasting machine is stab...

Embodiment 3

[0087] The 304 strip steel raw materials that present embodiment adopts have following element composition (weight %):

[0088] C 0.07%, Si 0.%, Mn 1.90%, P 0.035%, S 0.025%, Cr 20.00%, Ni 10.00%, and the rest are Fe and unavoidable impurities.

[0089] The thickness of the 304 strip steel raw material that present embodiment adopts is 4.0mm, and width is 1150mm.

[0090] This embodiment is specifically as follows:

[0091] (1) Annealing process:

[0092] The 304 hot-rolled black leather coils are annealed after being welded by a welding machine. The low-temperature annealing process is adopted. The line-passing speed TV is set at 130mm×m / min. Zone-12 furnace temperature control 1095 ℃.

[0093] (2) Scale-breaking shot blasting process:

[0094] The phosphorus-breaking process uses a large elongation to pass the line, and the test process uses 1.8% elongation. Adjust the shot blasting speed to 1780r / min before crossing the line. The current of the shot blasting machine i...

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Abstract

The invention provides a surface treatment method for a stainless steel coil. The surface treatment method comprises the following steps of (1) annealing the stainless steel coil to be treated at thetemperature of 1, 005 DEG C to 1, 095 DEG C; (2) carrying out descaling and shot blasting treatment on the annealed stainless steel coil by adopting a large-elongation wire with the elongation of 1.5%to 2%; and (3) carrying out acid pickling on the stainless steel coil subjected to descaling and shot blasting treatment. By adjusting and optimizing the annealing process, the descaling and shot blasting process and the acid pickling process, the stability of annealing and acid pickling is guaranteed, the annealing performance is excellent, the surface is uniform after acid pickling, the roughness meets the requirement, the quality is obviously improved, and the comprehensive yield is also improved.

Description

technical field [0001] The invention relates to the field of stainless steel processing, in particular, the invention relates to a surface treatment method for stainless steel coils. Background technique [0002] High-grade panel stainless steel is used in household appliances, kitchen utensils, decoration and other industries. The 304 series (such as BA board, polished 8K, etc.) is the most representative. Customers have extremely high requirements on the surface quality and processing performance of the final product. Its production process includes smelting in steelmaking plants, continuous casting→hot continuous rolling→annealing and pickling in cold rolling mills→cold rolling→annealing and pickling after rolling→inspection and packaging. It has a great impact on the subsequent surface. The cleanliness of the iron oxide scale on the surface and the roughness of the surface after descaling are the key factors affecting the surface quality of the finished stainless steel p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C23G1/08B24C1/08B24C1/10C21D1/26
CPCC21D9/52C21D1/26C23G1/08C23G1/086B24C1/086B24C1/10
Inventor 郑正高培军武志平李旭初董志刚李斯阳
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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