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High chromium weathering steel and preparation method thereof

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

Active Publication Date: 2017-12-29
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

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Comparison scheme
Effect test

preparation example Construction

[0023] The above-mentioned method for preparing high-chromium weathering steel mainly includes the following steps: billet → hot rolling → laminar cooling → coiling;

[0024] Among them, the starting temperature of finish rolling in the hot rolling step is 900-950°C, the finishing rolling temperature in the hot rolling step is 800-829°C; The ratio is 90-100%; the temperature in the coiling step is 520-557°C.

[0025] Further, as a more preferred technical solution, in the preparation method of the above-mentioned high-chromium weathering steel, the starting temperature of the finish rolling in the hot rolling step is 921°C, and the finishing rolling temperature in the hot rolling step is 814°C; The water volume ratio of the header is 85%, and the water volume ratio of the lower header is 100%; the coiling temperature is 545°C.

[0026] Wherein, in the hot rolling step, the finish rolling start temperature is 900-950° C., if the temperature is too low, the rolling rhythm is to...

Embodiment 1

[0033] The weight percent of the chemical composition of the billet is: C: 0.022%, Si: 0.05%, Mn: 0.22%, P: 0.008%, S: 0.002%, Cr: 4.95%, Ni: 0.15%, Cu: 0.30%, Ti 0.02%, the rest is Fe and unavoidable impurities.

[0034] In the hot rolling step, the finishing rolling start temperature is 921°C, and in the hot rolling step, the finishing rolling temperature is 814°C; in the cooling step, the laminar cooling upper header water ratio is 85%, and the lower header water ratio is 100%; the coiling step The temperature in it is 545°C.

[0035] The mechanical properties of the high chromium weathering steel produced by the method Rel: 480MPa, Rm: 595MPa, A%: 27%; low temperature impact performance (-40°C): 347J, weather resistance (relative corrosion rate): 22%.

Embodiment 2

[0037] The weight percent of the chemical composition of the billet is: C: 0.011%, Si: 0.02%, Mn: 0.16%, P: 0.005%, S: 0.004%, Cr: 4.55%, Ni: 0.11%, Cu: 0.22%, Ti 0.012 %, the rest is Fe and unavoidable impurities.

[0038] In the hot rolling step, the finish rolling start temperature is 905°C, and in the hot rolling step, the finish rolling temperature is 802°C; in the cooling step, the water volume ratio of the upper header for laminar cooling is 75%, and the water volume ratio of the lower header is 90%; the coiling step The temperature in it is 523°C.

[0039] The mechanical properties of the high chromium weathering steel produced by the method Rel: 475MPa, Rm: 588MPa, A%: 31%; low temperature impact performance (-40°C): 335J, weather resistance (relative corrosion rate): 24%.

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Abstract

The invention belongs to the field of steel smelting, and particularly relates to high-chromium weathering resistant steel and a rolling method thereof. The high-chromium weathering resistant steel comprises, by weight, smaller than or equal to 0.07% of C, smaller than or equal to 0.50% of Si, smaller than or equal to 1.5% of Mn, smaller than or equal to 0.02% of P, smaller than or equal to 0.010% of S, 0.20-0.55% of Cu, 4.50-5.50% of Cr, 0.10-0.65% of Ni, 0.01-0.03% of Ti and the balance Fe and inevitable impurities. The weathering resistant steel and a preparing method thereof have the beneficial effects that the production cost is low, the technology is simple, the product pass percent is high, and the comprehensive performance of the weathering resistant steel is superior. The requirement of the existing industry for the high weathering resistance of the weathering resistant steel can be met, the requirement for mechanical performance of steel stability can also be met, and especially the superior low-temperature impact resistance is achieved.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a high-chromium 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 compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21D8/00
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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