Weathering resistant steel with low yield ratio and preparation method thereof

A low yield ratio, weathering steel technology, applied in the field of iron and steel smelting, can solve the problems of high corrosion resistance and toughness of weathering steel, low chromium content and high phosphorus content in weathering steel, and achieve excellent comprehensive product performance. The effect of high qualified product rate and high product qualified rate

Inactive Publication Date: 2016-01-06
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chromium content in the patented weathering steel is low, and the phosphorus content is high, which easily leads to the brittleness of the steel, and the prepared steel cannot meet the new requirements of the existing industry for high corrosion resistance, strength and toughness of the weathering steel.

Method used

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  • Weathering resistant steel with low yield ratio and preparation method thereof
  • Weathering resistant steel with low yield ratio and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned low yield ratio weathering steel mainly includes the following steps: billet → hot rolling → laminar cooling → coiling;

[0026] Wherein, the start rolling temperature of the finish rolling in the hot rolling step is 950-995°C, the finish rolling temperature in the hot rolling step is 830-855°C, and the rolling speed in the hot rolling step is 2-10m / s; The proportion of water in the tube is 45-55%, the proportion of water in the lower header is 55-65%, the average cooling rate of the steel plate in the cooling step is 5-20°C / s; the coiling temperature is 560-596°C.

[0027] Further, as a more preferred technical solution, in the preparation method of the above-mentioned low yield ratio weathering steel, the starting temperature of the finish rolling in the hot rolling step is 975°C, the finishing rolling temperature in the hot rolling step is 845°C, and the hot rolling step The rolling speed in the step is 6.2m / s; the water ...

Embodiment 1

[0039] The weight percent of the chemical composition of the billet is: C: 0.04%, Si: 0.30%, Mn: 0.75%, P: 0.015%, S: 0.007%, Cr: 3.35%, Ni: 0.15%, Cu: 0.30%, Ti : 0.02%, the rest is Fe and unavoidable impurities.

[0040] The starting temperature of finish rolling in the hot rolling step is 975°C, the finish rolling temperature in the hot rolling step is 845°C; the rolling speed in the hot rolling step is 6.2m / s; the water volume ratio of laminar flow cooling in the cooling step is 50% , the proportion of water in the lower header is 60%; the average cooling rate of the steel plate in the cooling step is 12.5°C / s; the temperature in the coiling step is 580°C.

[0041] The low yield strength ratio weathering steel mechanical properties Rel: 523MPa, Rm: 715MPa, yield ratio 0.73, A%: 27% of the low yield strength ratio weathering steel produced by this method; Low temperature impact performance (-40 ℃): 185J, weather resistance performance (relative corrosion rate): 28%.

Embodiment 2

[0043] The weight percent of the chemical composition of the billet is: C: 0.031%, Si: 0.11%, Mn: 0.52%, P: 0.012%, S: 0.006%, Cr: 3.05%, Ni: 0.12%, Cu: 0.21%, Ti : 0.011%, the rest is Fe and unavoidable impurities.

[0044] The starting temperature of finish rolling in the hot rolling step is 952°C, the finish rolling temperature in the hot rolling step is 831°C; the rolling speed in the hot rolling step is 2.1m / s; the water volume ratio of the laminar cooling upper header in the cooling step is 45% , the proportion of water in the lower header is 55%; the average cooling rate of the steel plate in the cooling step is 5.2°C / s; the temperature in the coiling step is 563°C.

[0045] The low yield strength ratio weathering steel mechanical properties Rel: 505MPa, Rm: 708MPa produced by this method, yield strength ratio 0.71, A%: 27%; Low temperature impact performance (-40 ℃): 196J, weather resistance performance (relative corrosion rate): 29.3%.

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Abstract

The invention belongs to the field of iron and steel smelting and in particular relates to weathering resistant steel with low yield ratio and a rolling method thereof. The weathering resistant steel with low yield ratio comprises the following chemical components by weight percent: not more than 0.07% of C, not more than 0.50% of Si, not more than 1.5% of Mn, not more than 0.02% of P, not more than 0.010% of S, 0.20-0.55% of Cu, 3.00-3.70% of Cr, 0.10-0.65% of Ni, 0.01-0.03% of Ti and the balance of Fe and inevitable impurities. The preparation method has the characteristics of low production cost, simple process, high product percent of pass, excellent comprehensive properties of the weathering resistant steel, and the like. The weathering resistant steel can not only meet the high weather resistance requirement of the existing industries for the weathering resistant steel but also meet the mechanical property requirement of stability of steel and especially has excellent plasticity and higher strength.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a low yield ratio weathering steel and a preparation method thereof. Background technique [0002] Weather-resistant steel, also known as atmospheric corrosion-resistant steel, can resist corrosion under natural atmospheric conditions. It is a low-alloy steel series between ordinary steel and stainless steel. Weather-resistant steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the characteristics of high-quality steel, such as toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, and fatigue resistance; the weather resistance is 2 to 8 times that of ordinary carbon steel, and the paintability is 1.5 to 10 times that of ordinary carbon steel. . At the same time, it has the characteristics of rust resistance, corrosion resistance and life extension of compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D8/02
Inventor 李正荣王羿汪创伟龚慧王登刚崔凯禹
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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