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Titanium-containing high-chromium weathering steel and preparation method thereof

A weathering steel and high chromium technology, applied in the field of iron and steel smelting, can solve the problems of difficult structure control, strong hardenability and high chromium content, and achieve the effects of superior low temperature impact resistance, low production cost and good ductility.

Active Publication Date: 2017-07-18
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, the high-chromium weather-resistant steel has a high chromium content, and the weather-resistant steel prepared has high weather resistance and stable mechanical properties. However, the high chromium content and the strong hardenability of the steel make it difficult to control the structure during rolling. To obtain ideal structures and properties, The hot rolling process must be studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

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

[0024] Among them, the starting rolling temperature of the finish rolling in the hot rolling step is 1000-1100°C, the finishing rolling temperature in the hot rolling step is 860-900°C; The water ratio is 70-85%; the coiling temperature in the coiling step is 600-660°C.

[0025] Among them, the starting temperature of finish rolling is 1000~1100℃, if the starting temperature is too low, the rolling rhythm is too slow, and the production efficiency is low; if the starting temperature of finish rolling is too high, the cooling speed of the rolling process is too fast, and the structure is uneven , resulting in poor overall performance of the finished product.

[0026] In addition, if the finishing temperature in the hot rolling step is too low, the overall performance of the product will be ...

Embodiment 1

[0032] The weight percent of the chemical composition of the billet is: C: 0.02%, Si: 0.10%, Mn: 0.31%, P: 0.011%, S: 0.005%, Cr: 3.75%, Ni: 0.31%, Cu: 0.40%, Ti: 0.04%, the rest is Fe and unavoidable impurities.

[0033]In the hot rolling step, the finishing rolling start temperature is 1053°C, and in the hot rolling step, the finishing rolling temperature is 882°C; in the cooling step, the laminar cooling upper header water ratio is 65%, and the lower header water ratio is 80%; in the curling step The coiling temperature is preferably 635°C.

[0034] The mechanical properties of the high chromium weathering steel produced by the method Rel: 485MPa, Rm: 589MPa, A%: 34%; low temperature impact performance (-40°C): 223J, weather resistance (relative corrosion rate): 28%.

Embodiment 2

[0036] The weight percent of the chemical composition of the billet is: C: 0.01%, Si: 0.30%, Mn: 0.40%, P: 0.015%, S: 0.008%, Cr: 4.01%, Ni: 0.37%, Cu: 0.49%, Ti: 0.06%, the rest is Fe and unavoidable impurities.

[0037] In the hot rolling step, the finish rolling start temperature is 1005°C, and in the hot rolling step, the finish rolling temperature is 862°C; in the cooling step, the water volume ratio of the upper header for laminar cooling is 60%, and the water volume ratio of the lower header is 70%; the coiling step The temperature in it is 600°C.

[0038] The high chromium weathering steel produced by the method has mechanical properties Rel: 510MPa, Rm: 640MPa, A%: 32.5%, low temperature impact performance (-40°C): 275J, weather resistance (relative corrosion rate): 25%.

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Abstract

The invention belongs to the field of steel smelting, and particularly relates to titaniferous high-chromium weathering resistant steel and a rolling method thereof. The titaniferous 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 0.10% of S, 0.20%-0.55% of Cu, 3.00%-5.50% of Cr, 0.10%-0.65% of Ni, 0.04%-0.10% 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 yield is high, and the comprehensive performance of the weathering resistant steel is superior. The requirement of the existing industry for high weathering resistance of the weathering resistant steel can be met, the requirement for stable mechanical performance of steel can also be met, and especially superior low-temperature impact resistance and good ductility are achieved.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21D8/02
Inventor 李正荣汪创伟周伟龚慧王羿李卫平王登刚
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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