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Weather resistant steel plate and manufacturing method thereof

A manufacturing method and technology of steel plates, applied in the directions of temperature control, metal rolling, rolling force/roll gap control, etc., can solve the problems of increasing manufacturing costs, etc., and achieve reduced production costs, excellent low-temperature impact toughness, and excellent weldability Effect

Active Publication Date: 2011-08-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the content of Nb and V in the weathering steel is relatively high, and a certain amount of rare earth elements are added, which increases the manufacturing cost

Method used

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  • Weather resistant steel plate and manufacturing method thereof
  • Weather resistant steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the mass percent of the composition of the weathering steel plate is:

[0039] C: 0.082, Si: 0.30, Mn: 1.0, P: 0.011, S: 0.005, Cu: 0.30, Cr: 0.35, Ni: 0.40, Nb: 0.045, V: 0.045, Ti: 0.015, B: 0.0010, Ca: 0.0030, Al: 0.035, and the rest are Fe and other unavoidable impurities.

[0040] The production process of the weather-resistant steel plate in this embodiment is:

[0041] Provide the cast slab obtained after smelting in a 500kg vacuum induction furnace and cast by continuous casting method or die casting method; heat the cast slab to 1250°C; rough roll the cast slab, and the cast slab The cumulative reduction rate of the cast slab is ≥ 50%; the rough-rolled cast slab is finished rolled to form a 30cm thick steel plate, and the cumulative reduction rate of the cast slab during the finish rolling process is ≥ 40%, and the start temperature of the finish rolling is 930°C , the finish rolling temperature is 870°C; the steel plate after finish rolli...

Embodiment 2

[0044] In this embodiment, the mass percent of the composition of the weathering steel plate is:

[0045] C: 0.032, Si: 0.19, Mn: 1.58, P: 0.012, S: 0.003, Cu: 0.25, Cr: 0.45, Ni: 0.31, Mo: 0.40, Ti: 0.024, B: 0.0025, Ca: 0.0008, Al: 0.028, and the rest are Fe and other unavoidable impurities.

[0046] The production process of the weather-resistant steel plate in this embodiment is:

[0047] Provide the cast slab obtained by smelting in a 500kg vacuum induction furnace and cast by continuous casting method or mold casting method; heat the cast slab to 1150°C; rough roll the cast slab, and the cast slab is The cumulative reduction rate of the cast slab is ≥ 50%; the rough-rolled cast slab is finished rolled to form a 30cm thick steel plate, and the cumulative reduction rate of the cast slab in the finish rolling process is ≥ 40%, and the start temperature of the finish rolling is 950°C , the finish rolling temperature is 840°C; the steel plate after finish rolling is water-c...

Embodiment 3

[0050] In this embodiment, the mass percent of the composition of the weathering steel plate is:

[0051] C: 0.061, Si: 0.34, Mn: 1.33, P: 0.010, S: 0.0024, Cu: 0.40, Cr: 0.55, Ni: 0.20, Nb: 0.040, V: 0.031, Ti: 0.0023, Al: 0.040, and the rest are Fe and other unavoidable impurities.

[0052] The production process of the weather-resistant steel plate in this embodiment is:

[0053] Provide the cast slab obtained after smelting in a 500kg vacuum induction furnace and casting by continuous casting method or die casting method; heat the cast slab to 1200°C; rough roll the cast slab, and the cast slab is The cumulative reduction rate of the cast slab is ≥ 50%; the rough-rolled cast slab is finished rolled to form a 30cm thick steel plate, and the cumulative reduction rate of the cast slab in the finish rolling process is ≥ 40%, and the start temperature of the finish rolling is 900°C , the finish rolling temperature is 880°C; the steel plate after finish rolling is water-cooled...

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Abstract

The present invention provides a weather resistant steel plate, which comprises components of, by mass percent, 0.02 to 0.10 of C, 0.10 to 0.40 of Si, 1.0 to 1.6 of Mn, less than or equal to 0.025 of P, less than or equal to 0.015 of S, 0.20 to 0.50 of Cu, 0.30 to 0.60 of Cr, 0.10 to 0.50 of Ni, less than or equal to 0.40 of Mo, less than or equal to 0.060 of Nb, less than or equal to 0.060 of V,0.010 to 0.035 of Ti, less than or equal to 0.0030 of B, less than or equal to 0.0050 of Ca, 0.015 to 0.050 of Al, and the balance Fe and other unavoidable impurities. Correspondingly, the present invention also provides a manufacturing method of the weather resistant steel plate. Through reasonable distribution ratio of alloy components, the method provided in the invention can obtain a high-strength and high-toughness weather resistant steel plate with good corrosion resisting performance, high yield strength and tensile strength, and excellent low temperature impact toughness. The steel plate also possesses good weldability, being able to carry out welding without preheating or employ lower preheating temperature welding. The steel plate provided in the invention can be widely applied to large-scale steel structure engineering such as building structures, bridges, etc.

Description

technical field [0001] The invention relates to the field of manufacturing low-alloy steel plates, in particular to a high-strength, high-toughness weather-resistant steel plate and a manufacturing method thereof. Background technique [0002] Weathering steel has excellent atmospheric corrosion resistance, and under certain conditions, it does not need to be painted, which greatly reduces the operation and maintenance costs of steel structures, and has a significant environmental protection effect. Therefore, weathering steel has significant advantages over ordinary steel in the application of large-scale steel structure projects such as bridges and building structures. The American standard refers to steel with a weather resistance index I greater than or equal to 6.0 as weathering steel, and the weather resistance index I is defined by the following formula: [0003] I=26.01Cu+3.88Ni+1.2Cr+1.49Si+17.28P-7.29CuNi-9.1NiP-33.39Cu 2 . [0004] The strength level of weather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/50B21B1/22B21B37/74B21B37/58
Inventor 胡晓萍温东辉宋凤明柏明卓刘刚
Owner BAOSHAN IRON & STEEL CO LTD
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