Weather-resistant hot rolled broad steel strip and method for manufacturing same

A manufacturing method and technology for steel strips are applied in the fields of weathering steel and its manufacture, and weathering hot-rolled wide steel strips, which can solve the problems of difficulty in market promotion and high cost, and achieve good atmospheric corrosion resistance, low cost and good formability. Effect

Inactive Publication Date: 2009-07-15
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of this invention is very high, and it is difficult to promote it in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Weather-resistant hot-rolled wide steel strip and its manufacturing method

[0032] 1. The chemical composition of steel is as follows in weight percentage:

[0033] C: 0.08%, Si: 0.38%, Mn: 0.38%, P: 0.086%, S: 0.005%, Cu: 0.263%, Cr: 0.349%, Ni: 0.125%, Alt: 0.021%, the rest is Fe and non Impurities to avoid.

[0034] 2. Manufacturing method of weather-resistant hot-rolled wide steel strip

[0035] (1) Production process

[0036] Hot metal pretreatment—top and bottom combined blowing converter smelting—LF ladle refining—slab continuous casting—1500 wide strip rolling

[0037] (2) Taking 6.0mm thick steel strip as an example, the casting billet thickness is 160mm, which is a medium and thin slab. Proceed as follows:

[0038]Hot metal pretreatment hot metal sulfur is controlled below 0.010%, the temperature is not less than 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization. End point control of converter smelting: C: 0.04%, S: ...

Embodiment 2

[0040] Example 2: Weather-resistant hot-rolled wide steel strip and its manufacturing method

[0041] 1. The chemical composition of steel is as follows in weight percentage:

[0042] C: 0.07%, Si: 0.35%, Mn: 0.38%, P: 0.089%, S: 0.006%, Cu: 0.281%, Cr: 0.375%, Ni: 0.133%, Alt: 0.015%, the rest is Fe and non Impurities to avoid.

[0043] 2. The manufacturing method of weather-resistant hot-rolled wide steel strip, and the production process flow is the same as that in Example 1.

[0044] Taking 3.8mm thick steel strip as an example, the casting billet thickness is 160mm, which is a medium-thin slab. Proceed as follows:

[0045] Hot metal pretreatment hot metal sulfur is controlled below 0.010%, the temperature is not less than 1250 ℃, and the slag on the surface of the hot metal is removed after desulfurization. End point control of converter smelting: C: 0.04%, S: 0.010%. LF refining white residue operation. Each furnace of molten steel is fed into a 500mSi-Ca wire for calcificat...

Embodiment 3

[0048] 1. The chemical composition of steel is as follows in weight percentage:

[0049] C: 0.08%, Si: 0.37%, Mn: 0.4%, P: 0.094%, S: 0.008%, Cu: 0.307%, Cr: 0.338%, Ni: 0.126%, Alt: 0.015%, the rest is Fe and non Impurities to avoid.

[0050] The manufacturing method is the same as in Example 1.

[0051] The performance data of the wide steel strip is listed in Table 1. The relevant test methods adopt international general standards:

[0052] Table 1

[0053]

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Abstract

The invention relates to a manufacturing method of weathering resistance steel stripe. The chemical components based on the weight percentage are that: C of 0.06 to 0.12 per cent, Si of 0.25 to 0.50 per cent, Mn of 0.30 to 0.50 per cent, P of 0.07 to 0.15 per cent, S of less than 0.015 per cent, Cu of 0.25 to 0.40 per cent, Cr of 0.30 to 1.2 per cent, Ni of 0.10 to 0.50 per cent, and the remainder Fe and unavoidable foreign matters. The steel stripe is manufactured by converter smelting, continuous sheet blank casting, and rolling by a hot continuous rolling unit, etc., which has excellent anti-corrosion performance and weldability, even mechanical properties, and can be used for making a plurality of products with long service life. The weathering resistance steel stripe is especially suitable for manufacturing containers, and has low cost and easy industrialization.

Description

Technical field [0001] The invention relates to a weather-resistant steel and a manufacturing method thereof, belonging to the field of low-alloy steel manufacturing, in particular to a weather-resistant hot-rolled wide steel strip mainly used for container manufacturing. Background technique [0002] Weathering steel is a general term for a type of steel that is resistant to atmospheric corrosion. The prior art generally uses the addition of a large amount of alloy elements such as Cu, P, Cr, Ni, Al to the steel, and some also add As, Ce, Co, Ti, V And other elements. For example, Chinese patent documents CN1752260 and CN1970818, although this improves the performance of steel, but the cost is too high, and the process flow is complicated, and there is greater difficulty in marketization. [0003] Chinese patent document CN1664152 discloses a highly strong corrosion-resistant steel plate for railway vehicles (hereinafter referred to as steel grade 1) and its preparation method (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C22C33/04B21B1/46B21B37/74B21C47/02C21C7/064C21C7/06C21C7/072B22D11/16C21D8/02
Inventor 董杰周平亓伟伟王学新孙正旭霍孝新宁伟杨旭胡滨陈爱娇
Owner LAIWU IRON & STEEL GRP
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