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Method for producing cold-rolled sheet for surface coating and plating base plate

A technology of cold-rolled thin plate and production method, which is applied in coating, metal rolling, hot-dip galvanizing process, etc. It can solve problems such as color difference, poor surface quality, and failure to meet the requirements of high-end customers, and achieve a bright, clean, and excellent surface. Effect of formability, excellent surface quality and coating performance

Active Publication Date: 2014-11-19
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when traditional cold-rolled coated substrates are cold-rolled, continuously annealed, and galvanized, the work rolls of the rolling mill, the work rolls of the continuous annealing mill, and the work rolls of the galvanizing skin pass machine all use ordinary Cr3 or Cr5 rolls, and the surface quality is relatively low. Poor, mainly due to defects such as chromatic aberration, roll printing, scratches, light and dark stripes, zinc flow lines, etc., which cannot meet the requirements of high-end customers

Method used

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  • Method for producing cold-rolled sheet for surface coating and plating base plate
  • Method for producing cold-rolled sheet for surface coating and plating base plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The mass percentages of steel billets used are: C, 0.12%; Si, 0.050%; Mn, 0.60%; P, 0.040%; S, 0.04%;

[0039] The tapping temperature is 1280°C, the exit temperature of rough rolling is 1200°C, the final rolling temperature is 950°C, and the coiling temperature is 750°C.

[0040] The free acid in pickling 1# acid tank is controlled at 55g / L, the pickling temperature is 90°C, and the pickling speed is 200m / min.

[0041] The work rolls of stands 1, 2 and 5 of the rolling mill use chrome-plated rolls. The surface roughness Ra of the work rolls of stands 1 and 2 is 0.8 μm, the surface roughness of the work rolls of stands 3 and 4 is 0.7 μm, and the surface roughness of the work rolls of stand 5 is The roughness Ra is 3.0 μm; the concentration of the emulsified liquid is 4.5% for racks 1 to 4, and the concentration of the emulsified liquid for racks 5 is 1.5%. Cold rolling reduction rate is controlled at 85%.

[0042] The subsequent process adopts the continuous annealing ...

Embodiment 2

[0048] The mass percentages of steel billets used are: C, 0.11%; Si, 0.040%; Mn, 0.50%; P, 0.035%; S, 0.036%, and the balance is Fe.

[0049] The tapping temperature is 1220°C, the exit temperature of rough rolling is 1090°C, the final rolling temperature is 910°C, and the coiling temperature is 710°C.

[0050] Pickling 1# acid tank free acid concentration 5g / L, pickling temperature 75°C, pickling speed 140m / min.

[0051] The work rolls of stands 1, 2, and 5 of the rolling mill use chrome-plated rolls. The surface roughness Ra of the work rolls of stands 1 and 2 is 0.7 μm, the surface roughness of the work rolls of stands 3 and 4 is 0.6 μm, and the surface roughness of the work rolls of stand 5 is The roughness Ra is 3.0 μm; the concentration of the emulsified solution is 2.5% for racks 1 to 4, and the concentration of the emulsified liquid for racks 5 is 0.5%. Cold rolling reduction rate is controlled at 60%.

[0052] The subsequent process adopts the continuous annealing p...

Embodiment 3

[0058] The mass percentages of steel billets used are: C, 0.09%; Si, 0.040%; Mn, 0.40%; P, 0.030%; S, 0.03%, and the balance is Fe.

[0059] The tapping temperature is 1250°C, the exit temperature of rough rolling is 1105°C, the final rolling temperature is 935°C, and the coiling temperature is 734°C.

[0060] The free acid in pickling 1# acid tank is controlled at 53g / L, the pickling temperature is 80°C, and the pickling speed is 180m / min.

[0061] The work rolls of stands 1, 2 and 5 of the rolling mill use chrome-plated rolls. The surface roughness Ra of the work rolls of stands 1 and 2 is 0.8 μm, the surface roughness of the work rolls of stands 3 and 4 is 0.7 μm, and the surface roughness of the work rolls of stand 5 is The roughness Ra is 3.0 μm; the concentration of the emulsified liquid is 4.5% for racks 1 to 4, and the concentration of the emulsified liquid for racks 5 is 1.5%. Cold rolling reduction rate is controlled at 81%.

[0062] The subsequent process adopts t...

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Abstract

The invention discloses a method for producing a cold-rolled sheet for a surface coating and plating base plate. A steel billet comprises the following compositions by weight percentage: at most 0.12 percent of C, at most 0.05 percent of Si, at most 0.60 percent of Mn, at most 0.04 percent of P, at most 0.04 percent of S, and the balance of Fe. The steel billet comprising the compositions is sequentially subjected to hot rolling, acid washing and cold rolling to obtain a cold-rolled steel coil, and then the cold-rolled steel coil is made into the cold-rolled sheet for the surface coating and plating base plate through a continuous annealing or galvanizing method. Continuous annealing coating and plating bases plate and galvanizing coating and plating base plates produced through the method for producing the cold-rolled sheet for the surface coating and plating base plate have a good formability, meanwhile also have a good surface quality and paintability, and can be used as base plates of high-grade electric galvanized sheets, prepainted steel sheets, tinning sheets and aluminized steel sheets.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a production method of a cold-rolled sheet for a surface-coated substrate Background technique [0002] Cold-rolled coated substrates are used as raw materials for electro-galvanized, aluminum-plated, color-coated, tin-plated and other products. There are mainly two kinds of cold-rolled coated substrates: continuous strip coating substrate and galvanized coating substrate. Continuous strip coating substrate is generally used for electrogalvanizing, color coating, tin plating, aluminum plating, etc. Prepainted. Because the customer needs to coat a layer of other metals or substances on the surface of the strip during the subsequent processing of the coated substrate, if the coating is relatively thick, it can cover up some defects on the substrate, if the coating is relatively thin , which in most cases will amplify some defects on the substrate. The actual situation is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22C21D8/02C23G1/08C23G3/02C25F1/06C23C2/06C23C2/40C23C2/16C22C38/00
Inventor 陈波毕安园尹显东乔建军
Owner SHOUGANG CORPORATION