Low-cost high-strength prepainted steel sheet and manufacture method thereof

A manufacturing method and technology of color-coated boards, which are applied in the field of steel manufacturing, can solve problems affecting color-coating operations and the service life of color-coated boards, reduce the adhesion of color-coated pretreatment conversion layers, and complex chemical components of substrates, etc. The effect of increasing the speed of galvanizing line, reducing the annealing temperature of hot-dip galvanizing and improving market competitiveness

Inactive Publication Date: 2010-11-10
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The chemical composition of the substrate is complex. In order to meet the performance requirements, many alloying elements are usually added with high content. For example, microalloying elements such as niobium, vanadium, titanium, and molybdenum are used to improve the strength. Although the performance of the substrate is improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.095, Si: 0.011, Mn: 0.52, P: 0.019, S: 0.009, solAl: 0.046, N: 0.0014, Cr: 0.013, Cu : 0.038, Ni: 0.009, the rest is Fe and unavoidable impurities. Steelmaking with molten iron→continuous casting→hot rolling→pickling→cold rolling→hot-dip galvanizing→alloying→smoothing→color coating, among which, the cumulative reduction rate of cold rolling is 68%, with five stands for 5 passes The hot-dip galvanizing annealing temperature is controlled at 730℃, the hot-dip galvanizing unit speed is 110m / min, and the zinc-iron alloy coating weight is 175g / m 2 (Double-sided), the alloying temperature of the galvanized layer is 535℃, the iron content of the alloy layer is 9.5%, the roughness Ra after finishing is controlled at 0.60μm, and the 0.8mm thick low-cost high-strength color-coated board is produced. The 0.8mm thick low-cost high-strength color-coated sheet produced by this method has a yield stre...

Example Embodiment

[0030] Example 2: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.079, Si: 0.017, Mn: 0.52, P: 0.021, S: 0.007, solAl: 0.041, N: 0.0015, Cr: 0.012, Cu : 0.037, Ni: 0.008, the rest is Fe and unavoidable impurities. Steelmaking with molten iron→continuous casting→hot rolling→pickling→cold rolling→hot-dip galvanizing→alloying→smoothing→color coating, in which the cumulative reduction rate of cold rolling is 70%, and 5 passes are performed with five stands Cold rolling, hot-dip galvanizing annealing temperature is controlled at 720℃, hot-dip galvanizing unit speed is 100m / min, zinc-iron alloy coating weight is 150g / m 2 (Double-sided), hot-dip galvanized layer alloying temperature 545℃, alloy layer iron content: 11%, roughness Ra after finishing is controlled at 0.35μm, to produce 1.0mm thick low-cost high-strength color-coated board. The 1.0mm thick low-cost high-strength color-coated board produced by this method has a yield strength of R P0.2 (Or R eH )...

Example Embodiment

[0031] Example 3: The chemical composition (wt%) of low carbon aluminum killed steel is C: 0.083, Si: 0.015, Mn: 0.50, P: 0.017, S: 0.009, solAl: 0.034, N: 0.0016, Cr: 0.014, Cu : 0.038, Ni: 0.009, the rest is Fe and unavoidable impurities. Steelmaking with molten iron→continuous casting→hot rolling→pickling→cold rolling→hot-dip galvanizing→alloying→smoothing→color coating, of which the cumulative reduction rate of cold rolling is 72%, and five stands are used for 5 passes The hot-dip galvanizing annealing temperature is controlled at 750℃, the hot-dip galvanizing unit speed is 115m / min, and the zinc-iron alloy coating weight is 110g / m 2 (Double-sided), hot-dip galvanized layer alloying temperature 525℃, alloy layer iron content: 8.5%, roughness Ra after finishing is controlled at 0.45μm, producing 0.6mm thick low-cost high-strength color-coated sheet. The 0.6mm thick low-cost high-strength color-coated sheet produced by this method has a yield strength R P0.2 (Or R eH ) Is 320...

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Abstract

The invention discloses a low-cost high-strength prepainted steel sheet and a manufacture method thereof. The low-cost high-strength prepainted steel sheet comprises the following base materials containing chemical components in percent by weight: 0.06-0.10 percent of C, not more than 0.05 percent of Si, 0.30-0.70 percent of Mn, 0.01-0.03 percent of P, not more than 0.02 percent of S, 0.01-0.07 percent of solAl, not more than 0.005 percent of N, not more than 0.08 percent of Cr, not more than 0.11 percent of Cu, not more than 0.06 percent of Ni and the balance of Fe and unavoidable impurities. The preparation method comprises the steps of: steel-making through molten iron, continuously casting, hot-rolling, acid-washing, hot dipping, alloying, finishing and prepainting. The prepainted steel sheet has the advantages of good stamping property, excellent corrosion prevention property, low production cost and better economic and social benefits, and can be widely applied to the outdoor large building industry.

Description

technical field [0001] The invention relates to the field of steel product manufacturing, in particular to a low-cost high-strength color-coated plate and a manufacturing method thereof. Background technique [0002] my country's color-coated boards are mainly used in the construction field, and the proportion of sandwich panels and corrugated boards accounts for about 85% of the color-coated boards used in construction. This type of board requires high strength, good toughness and excellent corrosion resistance. sex. Its manufacturing method is usually molten iron steelmaking, continuous casting, hot rolling, pickling, cold rolling, hot-dip galvanizing, skin pass, and color coating. As a high-strength color-coated base material, in order to ensure the strength, more alloying elements are usually added to the steel, which increases the production cost on the one hand; on the other hand, reduces the adhesion of the coating, resulting in a decrease in the corrosion resistance ...

Claims

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Application Information

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IPC IPC(8): C22C38/42C22C38/06C22C38/20B21B1/28C23C2/06C23C2/26C21D1/26
Inventor 涂元强陈勇蔡捷张万灵白会平黄春燕陈耀红郑洪道
Owner WUHAN IRON & STEEL (GROUP) CORP
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