Continuous annealing acid pickling system and method for hot rolling stainless steel composite steel belt

A composite steel and stainless steel technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as inability to realize continuous annealing and pickling functions, complicated proportioning of pickling passivation solution, and unguaranteed plate shape. , to achieve the effect of stable product performance and surface quality, obvious pickling effect and low processing cost

Inactive Publication Date: 2015-10-28
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods are mainly for pickling stainless steel clad plates. The disadvantages are that the production efficiency is low, the continuous annealing and pickling functions cannot be realized, and the color difference of the plate surface after pickling is serious, and the shape of the plate cannot be guaranteed. more complicated

Method used

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  • Continuous annealing acid pickling system and method for hot rolling stainless steel composite steel belt
  • Continuous annealing acid pickling system and method for hot rolling stainless steel composite steel belt
  • Continuous annealing acid pickling system and method for hot rolling stainless steel composite steel belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Specifications (thickness*width) of steel strip to be annealed and pickled: 2.95×1240mm.

[0037] Anneal and pickle as follows:

[0038] Welding: The steel coils are uncoiled, straightened and cut and then sent to a MIG argon arc welding machine for welding, with a welding current of 135A and a welding speed of 600mm / min.

[0039] Annealing temperature: P3 plate temperature 1057 ℃, TV value 130.

[0040] Mechanical descaling: the reduction of the scale breaker, the bending roller is 70mm, the straightening roller is 75mm, and the shot blasting machine has 2 sets of 16 blasting heads, and the blasting head current is 100A.

[0041] Pickling temperature and concentration control: sulfuric acid section: concentration 237.1 g / l, metal concentration 46.2 g / l, temperature 81 °C; mixed acid section I: nitric acid concentration 132.5 g / l, hydrofluoric acid concentration 38.3 g / l, metal concentration 46.5 g / l, temperature 57.9 °C; mixed acid stage II: nitric acid concentration...

Embodiment 2

[0044] Specification of pickling strip to be annealed (thickness * width): 3.0×1240mm.

[0045] Anneal and pickle as follows:

[0046] Welding: The steel coils are uncoiled, straightened and cut and then sent to a MIG argon arc welding machine for welding, with a welding current of 150A and a welding speed of 550mm / min.

[0047] Annealing temperature: P3 plate temperature 1051 ℃, TV value 125.

[0048] Mechanical descaling: the reduction of the scale breaker, the bending roller is 75mm, the straightening roller is 80mm, the shot blasting machine has 2 sets of 16 blasting heads, and the blasting head current is 100A.

[0049] Sulfuric acid section: concentration 218.4g / l, metal concentration 47.5 g / l, temperature 80℃; Mixed acid section I: nitric acid concentration 130.8 g / l, hydrofluoric acid concentration 36.1g / l, metal concentration 47.9 g / l, temperature 58.0℃ ; Mixed acid stage II: nitric acid concentration 109.7 g / l, hydrofluoric acid concentration 30.4 g / l, metal concen...

Embodiment 3

[0052] Specification of pickling strip to be annealed (thickness*width): 3.75×1240mm.

[0053]Anneal and pickle as follows:

[0054] Welding: The steel coils are uncoiled, straightened and cut and then sent to a MIG argon arc welding machine for welding with a welding current of 175A and a welding speed of 500mm / min.

[0055] Annealing temperature: P3 plate temperature 1048 ℃, TV value 112.

[0056] Mechanical descaling: the reduction of the scale breaker, the bending roller is 80mm, the straightening roller is 85mm, the shot blasting machine has 2 sets of 16 blasting heads, and the blasting head current is 95A.

[0057] Sulfuric acid section: concentration 210.5g / l, metal concentration 45.1 g / l, temperature 80℃; Mixed acid section I: nitric acid concentration 122.6 g / l, hydrofluoric acid concentration 33.5 g / l, metal concentration 41.9 g / l, temperature 57.5℃ ; Mixed acid stage II: nitric acid concentration 109.8 g / l, hydrofluoric acid concentration 28.4 g / l, metal concentra...

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Abstract

The invention discloses a continuous annealing acid pickling system for a hot rolling stainless steel composite steel belt. The system comprises two uncoilers, a straightener, two crop end shears, an MIG argon arc automatic welder, a front loop, a continuous annealing furnace, a straightener, four shot blasting machines, six shallow slot turbulent flow acid pickling grooves, a temper mill, a rear loop, a slitting shear and a recoiler. The invention also discloses an acid pickling method which utilizes the system. After the technology is adopted, the production efficiency is high; the product performance and the surface quality are stable; a product can meet the requirements of customers; the processing cost is low; and the market competitiveness is strong.

Description

technical field [0001] The invention relates to a continuous annealing and pickling system and method for a hot-rolled stainless steel composite strip. Background technique [0002] The stainless steel clad steel strip uses carbon steel as the base material and stainless steel as the cladding material. It not only has the corrosion resistance of stainless steel, but also has the good mechanical strength and processing performance of carbon steel. It is a new type of industrial product. Stainless steel clad steel strips have been widely used in petroleum, chemical, salt, water conservancy and electric power, and other industries. As a resource-saving product, it reduces the consumption of precious metals and greatly reduces the project cost. To achieve the perfect combination of low cost and high performance, there are good social benefits. [0003] The applicant's stainless steel rolling mill produced qualified 06Cr19Ni10+SPHC+06Cr19Ni10 hot-rolled stainless steel clad ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/56C21D1/26C23G3/02
CPCC23G3/021
Inventor 陈培敦王学军亓海燕李志平李锋
Owner SHANDONG TAISHAN STEEL GROUP
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