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Production method of medium-chromium ferrite stainless steel cold-rolled strip steel

A technology of cold-rolled strip steel and production methods, applied in the direction of rolls, metal rolling, metal rolling, etc., which can solve the problems of low surface roughness, dirty surface pickling, and difficult configuration of roll roughness, etc., and achieve process stability High reliability, high product quality consistency, and improved yield

Inactive Publication Date: 2018-11-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

430 series stainless steel cold-rolled strips require low surface roughness. It is difficult to configure the roll roughness of the six-high five-stand continuous rolling mill. After annealing and pickling, the surface is prone to defects such as pickling uncleanness.

Method used

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  • Production method of medium-chromium ferrite stainless steel cold-rolled strip steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The thickness of 430 type hot-rolled coil is 3.0mm. After being welded by laser welding machine, it is rolled by six-high five-stand continuous rolling mill. The total deformation rate of rolling is 81%, the thickness of the finished product is 0.57mm, and the deformation rate of 1# to 5# racks gradually decreases, which are 30%-35%, 27%-33%, 25%-30%, 22%-27% , 18%-23%. The work roll diameter of the six-high five-stand continuous rolling mill is 460mm, and the roughness of the work rolls corresponding to the 1# to 5# stands is 0.8μm, 0.5μm, 0.5μm, 0.2μm, 0.06μm.

[0047] The rolled steel strip is subjected to continuous annealing treatment, the final annealed steel strip temperature is 880°C, cooled to room temperature by air cooling and water cooling, the annealing TV value is 95, and the annealing speed is 105m / min.

[0048] After annealing, the steel strip is subjected to continuous pickling treatment, and first uses a sodium sulfate aqueous solution to conduct neut...

Embodiment 2

[0052] The thickness of 430 type hot-rolled coil is 4.0mm. After being welded by laser welding machine, it is rolled by six-high five-stand continuous rolling mill. The total deformation rate of rolling is 76%, the thickness of the finished product is 0.97mm, and the deformation rate of 1# to 5# racks gradually decreases, which are 28%-33%, 26%-31%, 23%-28%, 20%-25% , 16%-21%. The work roll diameter of the six-high five-stand continuous rolling mill is 465mm, and the roughness of the work rolls corresponding to the 1# to 5# stands is 0.9μm, 0.5μm, 0.5μm, 0.2μm, 0.1μm.

[0053] The rolled steel strip is subjected to continuous annealing treatment, the final annealed steel strip temperature is 880°C, cooled to room temperature by air cooling and water cooling, and the annealing TV value is 95.

[0054] After annealing, the steel strip is subjected to continuous pickling treatment, and first uses a sodium sulfate aqueous solution for neutral salt electrolysis, with a density of ...

Embodiment 3

[0058] The thickness of 430 type hot-rolled coil is 6.0mm. After being welded by laser welding machine, it is rolled by six-high five-stand continuous rolling mill. The total deformation rate of rolling is 70%, the thickness of the finished product is 1.80mm, and the deformation rate of 1# to 5# racks gradually decreases, which are 25%-30%, 24%-29%, 20%-25%, 17%-23% , 16%-21%. The work roll diameter of the six-high five-stand continuous rolling mill is 462mm, and the roughness of the work rolls corresponding to the 1# to 5# stands is 1.0μm, 0.6μm, 0.6μm, 0.3μm, 0.12μm.

[0059] The rolled steel strip is subjected to continuous annealing treatment, the final annealed steel strip temperature is 880°C, cooled to room temperature by air cooling and water cooling, and the annealing TV value is 95.

[0060] After annealing, the steel strip is subjected to continuous pickling treatment, firstly using sodium sulfate aqueous solution for neutral salt electrolysis, with a density of 1....

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Abstract

The invention provides a production method of medium-chromium ferrite stainless steel cold-rolled strip steel. The method comprises the flowing steps of a rolling step, a continuous annealing step, acontinuous pickling step and an on-line leveling step, wherein the rolling step adopts a six-roller five-rack continuous rolling mill for rolling, wherein a total rolling deformation rate is 60%-85%;the six-roller five-rack continuous rolling mill comprises racks range from a first rack to a fifth rack, wherein the deformation rates from the first rack to the fifth rack are 25%-35%, 23%-33%, 20%-30%, 17%-27%, 15%-25% in sequence. The surface color uniformity and glossiness of the medium-chromium ferrite stainless steel cold-rolled strip steel produced by adopting the method are good, a yieldplatform is completely eliminated, the product quality consistency is high, and the yield is high.

Description

technical field [0001] The invention relates to the field of stainless steel processing, in particular, the invention relates to a method for producing a medium chromium ferritic stainless steel cold-rolled strip. Background technique [0002] Medium chromium ferritic stainless steel cold-rolled strip steel is widely used in household appliances, kitchen utensils, decoration and other industries, and the 430 series is the most representative, which requires high surface quality and processing performance. [0003] The traditional 430 series cold-rolled strip steel production method is: the hot-rolled coil is reversibly rolled by a 20-roll mill, or continuously rolled by a continuous rolling mill, then passed through a continuous annealing and pickling line, and then passed through a tempering machine to obtain the desired quality for downstream users. Cold rolled strip steel coils. However, products with a thickness of less than 0.6mm produced by traditional methods have th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B27/02C21D9/52C23G1/08C23G1/24
CPCB21B1/22B21B27/021B21B2001/221B21B2201/04C21D9/52C23G1/085C23G1/24
Inventor 付金柱高建兵刘素华武志平王月省李旭初张良武天宇段维芳
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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