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 improved to a certain extent, but It also greatly increases the manufacturing cost
[0005] 2. The powdering of the galvanized layer after alloying will reduce the adhesion between it and the color coating pretreatment conversion layer due to overalloying, which will affect the later color coating operation and the service life of the color coated plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→finishing→color coating, among which, the cumulative reduction rate of cold rolling is 68%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 730°C, the speed of the hot-dip galvanizing unit is 110m / min, and the weight of the zinc-iron alloy coating is 175g / m 2(Double-sided), the alloying temperature of the galvanized coating is 535°C, the iron content of the alloy layer is 9.5%, and the roughness Ra after skin pass is controlled at 0.60 μm, producing a low-cost high-strength color-coated plate with a thickness of 0.8mm. The yield strength R P0.2 (or R eH ) is...

Embodiment 2

[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, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→skin finishing→color coating, among which, the cumulative reduction rate of cold rolling is 70%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 720°C, the speed of the hot-dip galvanizing unit is 100m / min, and the weight of the zinc-iron alloy coating is 150g / m 2 (Double-sided), the alloying temperature of the hot-dip galvanized coating is 545°C, the iron content of the alloy layer: 11%, and the roughness Ra after skin finishing is controlled at 0.35 μm, producing a low-cost high-strength color-coated plate with a thickness of 1.0mm. The yield strength R P0....

Embodiment 3

[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, and the rest are Fe and unavoidable impurities. Hot metal steelmaking→continuous casting→hot rolling→pickling→cold rolling→hot galvanizing→alloying→finishing→color coating, among which, the cumulative reduction rate of cold rolling is 72%, and five passes are carried out with five stands The cold rolling, hot-dip galvanizing annealing temperature is controlled at 750°C, the speed of the hot-dip galvanizing unit is 115m / min, and the weight of the zinc-iron alloy coating is 110g / m 2 (Double-sided), the alloying temperature of the hot-dip galvanized coating is 525°C, the iron content of the alloy layer: 8.5%, and the roughness Ra after skin finishing is controlled at 0.45 μm, and a low-cost high-strength color-coated plate with a thickness of 0.6mm is produced. The 0.6mm thick low-cos...

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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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