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Production method of sulfuric acid dew-point corrosion resistance hot rolled sheet

A production method and dew point corrosion technology, applied in the field of hot-rolled steel plate production, can solve the problems of insufficient passivation layer on the metal surface and unstable acid resistance

Inactive Publication Date: 2010-12-22
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the chemical composition design of sulfuric acid dew point corrosion-resistant steel is produced by low C-Mn-Cu-Cr-Ni-Sb alloying scheme and controlled rolling and controlled cooling. The core is to improve the resistance of steel by adding chemical elements to improve the alloying effect. Sulfuric acid dew point performance, but the passivation layer on the metal surface formed in this way is not dense enough, so there is a disadvantage of unstable acid resistance

Method used

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  • Production method of sulfuric acid dew-point corrosion resistance hot rolled sheet

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Experimental program
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Effect test

Embodiment 1

[0029] a. Smelting molten steel: The smelting equipment is a 120-ton top-blown converter, and the semi-steel molten steel in the blast furnace is used as a raw material. For molten steel tanks, add 0.5 tons of aluminum-iron alloy (Anyang Jiaxin Refractories Co., Ltd.) for pre-deoxidation when 1 / 3 of the steel is tapped, and then add 50kg of pitch coke (Panzhihua Yangcheng Metallurgical Accessories Co., Ltd.) and 900Kg of silicon to the deoxidized molten steel. Manganese alloy (Dechang Ferroalloy Co., Ltd.), 130kg Fe-Ti40 alloy (the weight ratio of Fe and Ti is 3: 2) (Panzhihua Yangcheng Ferroalloy Branch), 120kg antimony beads (Changsha Antimony Products Factory), thereby producing a product containing Molten steel with the following composition (based on the total weight of molten steel): 0.09% of C, 0.29% of Si, 0.75% of Mn, 0.013% of P, 0.004% of S, 0.60% of Cr, 0.21% of Ni, 0.018% Ti, 0.32% Cu, 0.08% Sb, 0.034% Al, 0.0044% N, and the rest is Fe. Subsequently, the molten s...

Embodiment 2

[0037] The preparation mode of molten steel and process are similar to embodiment 1, and molten steel charge is 137 tons, and the molten steel composition of making is: the C of 0.08%, the Si of 0.32%, the Mn of 0.73%, the P of 0.015%, the P of 0.005% S, 0.58% Cr, 0.20% Ni, 0.02% Ti, 0.28% Cu, 0.08% Sb, 0.048% Al, 0.0046% N, and the rest is iron. Use this molten steel to produce acid-resistant steel. The heating temperature (that is, the rolling temperature of the slab) is 1225°C, the rolling start temperature (that is, the rough rolling temperature) is 1139°C, and the number of rough rolling is 6 times, and the thickness is reduced by 27.8mm each time. , the rough rolling outlet thickness is 33mm, the reduction distribution in the finishing rolling process is 33mm→26mm→20mm→15mm→10mm→7mm→4mm, the final rolling temperature is 885°C, the coiling temperature is 700°C, the finished product room temperature Rel is 405MPa, Rm is 510MPa, elongation 35%, excellent cold bending perfor...

Embodiment 3

[0039] The preparation mode of molten steel and process are similar to embodiment 1, and molten steel charge is 140 tons, and the molten steel composition of making is: the C of 0.07%, the Si of 0.30%, the Mn of 0.74%, the P of 0.013%, the P of 0.007% S, 0.60% Cr, 0.22% Ni, 0.021% Ti, 0.27% Cu, 0.08% Sb, 0.044% Al, 0.0040% N, and the rest is iron. Use this molten steel to produce acid-resistant steel, the heating temperature is 1240°C, the rolling start temperature is 1138°C, the number of rough rolling is 6 times, the thickness is reduced by 27.8mm each time, the rough rolling exit thickness is 33mm, and the reduction distribution in the finishing rolling process is 33mm→24mm →16mm→10mm→7mm→4mm, the final rolling temperature is 890°C, the coiling temperature is 660°C, the finished product room temperature Rel is 420MPa, Rm is 525MPa, the elongation is 34%, and the cold bending performance is excellent, at 20% sulfuric acid + 20°C + Under the test condition of constant tempera...

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Abstract

The invention provides a production method of a sulfuric acid dew-point corrosion resistance hot rolled sheet, which comprises the following steps: smelting blast furnace molten iron and smelting furnace material in a converter, alloying and deoxidizing to obtain molten steel; carrying out LF refining on the molten steel, feeding Ca-Si wire to carry out sulphide inclusion modification, and carrying out electric heating; carrying out continuous casting on molten steel, and cooling to form a hot rolled slab; carrying out hot rolling on the hot rolled slab, and controlling the discharge rolling temperature of the slab at 1200-1240 DEG C; and cooling, coiling and finishing to obtain the sulfuric acid dew-point corrosion resistance hot rolled sheet. The invention has the advantages of low production cost, simple hot rolling technique, no need of additional equipment investment and excellent sulfuric acid dew-point corrosion resistance.

Description

technical field [0001] The invention relates to the production field of hot-rolled steel plates, in particular, the invention relates to a production method of sulfuric acid dew point corrosion-resistant hot-rolled steel plates. Background technique [0002] In metallurgy, electric power, petrochemical and other industrial fields, for flue gas treatment systems that use coal or heavy oil as the main fuel, such as air preheaters, economizers, flues, chimneys, and desulfurization devices in low-temperature parts of boilers, because fuel Usually contains 2%-3% sulfur, so the flue gas after combustion will contain about 0.2% sulfur dioxide, of which 1%-2% sulfur dioxide is catalyzed by ash and metal oxides to generate sulfur trioxide, three The sulfur oxides then combine with the combustion gases and moisture contained in the air to form sulfuric acid. When the ambient temperature is below 130-150°C, the sulfuric acid in the flue gas has a dew point, that is, the sulfuric acid ...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C38/58C22C33/04C21D8/02
Inventor 刘庆春郑之旺刘勇许哲峰李正荣冯远超黄徐晶
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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