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Hot rolled steel strip with resistance to corrosion of hydrochloric acid and sulfuric acid and production method thereof

A production method, hydrochloric acid resistance technology, applied in the field of metallurgy, to achieve the effect of excellent corrosion resistance and excellent resistance

Inactive Publication Date: 2015-03-25
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no hydrochloric acid and sulfuric acid corrosion-resistant steel strip that meets the requirements. Therefore, the application prospect of hydrochloric acid and sulfuric acid corrosion-resistant steel strip is relatively considerable.

Method used

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  • Hot rolled steel strip with resistance to corrosion of hydrochloric acid and sulfuric acid and production method thereof
  • Hot rolled steel strip with resistance to corrosion of hydrochloric acid and sulfuric acid and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0015] The hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip in this embodiment includes the following components by weight percentage: C: 0.04%, Si: 0.30%, Mn: 1.19%, P: 0.009%, S: 0.026%, Ni: 0.18% , Cr: 0.03%, Cu: 0.38%, Nb: 0.001%, Sb: 0.11%, Sn: 0.07%, Ca: 0.0010%, Alt: 0.025%, N: 0.0036%, the rest is iron and unavoidable impurities.

[0016] The production process of the hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip in this embodiment is produced by a three-roll mill, including a converter or electric furnace smelting process, an out-of-furnace refining process, a continuous casting process, a rolling process, and a coiling process; The heating temperature of the billet is 1200℃, and the heating time is 2 hours and 30 minutes. It is rolled into a steel strip with a thickness of 2.5mm. The rough rolling start temperature: 1140℃, the start rolling temperature of the continuous rolling mill: 1070℃, the final rolling ...

Embodiment 2

[0018] The hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip in this embodiment includes the following components by weight percentage: C: 0.05%, Si: 0.32%, Mn: 1.05%, P: 0.011%, S: 0.008%, Ni: 0.23% , Cr: 0.08%, Cu: 0.47%, Mo: 0.11%, Nb: 0.051%, Ti: 0.012%, Sb: 0.090%, RE: 0.028%, Ca: 0.0015%, Alt: 0.043%, N: 0.0045% , The rest is iron and inevitable impurities;

[0019] The production process of the hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip in this embodiment is produced by a three-roll mill, including a converter or electric furnace smelting process, an out-of-furnace refining process, a continuous casting process, a rolling process, and a coiling process; Billet heating temperature: 1160℃, heating time 4 hours and 10 minutes, rolled into a steel strip with a thickness of 2.75mm, rough rolling opening temperature: 1100℃, entering the continuous rolling mill opening temperature: 890℃, final rolling temperature: 7...

Embodiment 3

[0021] The hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip of this embodiment includes the following components by weight percentage:

[0022] C: 0.06%, Si: 0.35%, Mn: 0.85%, P: 0.015%, S: 0.022%, Ni: 0.11%, Cr: 0.03%, Cu: 0.29%, Nb: 0.020%, Ti: 0.050%, V: 0.020%, Sb: 0.10%, Ca: 0.0030%, Alt: 0.031%, N: 0.0065%, the rest is iron and unavoidable impurities;

[0023] The production process of the hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip in this embodiment is produced by a three-roll mill, including a converter or electric furnace smelting process, an out-of-furnace refining process, a continuous casting process, a rolling process, and a coiling process; Billet heating temperature: 1180℃, heating time 3 hours and 30 minutes, rolled into a steel strip with a thickness of 10mm, rough rolling opening temperature: 1140℃, entering the continuous rolling mill opening temperature: 980℃, final rolling temperature: 900℃ , Co...

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Abstract

The invention discloses a hot rolled steel strip with resistance to corrosion of hydrochloric acid and sulfuric acid and a production method thereof. The hot rolled steel strip comprises the following chemical components in percentage by weight: less than or equal to 0.060% of C, less than or equal to 0.55% of Si, 0.50-1.20% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, less than or equal to 0.35% of Ni, less than or equal to 0.10% of Cr, 0.20-0.50% of Cu, less than or equal to 0.060% of Nb, less than or equal to 0.15% of Sb, 0.0005-0.0040% of Ca, less than or equal to 0.060% of Al, less than or equal to 0.0080% of N, and the balance of Fe and inevitable impurities. According to the production method, a hot rolling process is adopted, the continuous casting billet heating temperature is 1120-1220 DEG C, the heating time is 2-5 hours, the rough rolling beginning temperature is 1050-1160 DEG C, the beginning temperature of a continuous rolling unit is 850-1100 DEG C, the finishing rolling temperature of the continuous rolling unit is 700-950 DEG C, and the coiling temperature is 600-750 DEG C. By adopting the production method disclosed by the invention, low-carbon and alloyed components are adopted to ensure that the steel strip has excellent resistance to hydrochloric acid and sulfuric acid dew point environments, so that the steel strip can be widely applied to equipment such as air pre-heaters, coal economizers, desulfurization and denitration devices and the like in industries of petroleum, chemical engineering, electric power and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a corrosion-resistant steel strip for hydrochloric acid and sulfuric acid environments, in particular to a hydrochloric acid and sulfuric acid corrosion-resistant hot-rolled steel strip and a production method thereof. Background technique [0002] In metallurgy, electric power, petrochemical and other industrial fields, flue gas treatment systems such as air preheaters, economizers, desulfurization and denitrification devices, etc., which use heavy oil, coal combustion or incineration of domestic waste as the main fuel, produce flue gas containing SO 2 , SO 3 , HCl and other corrosive acid gases. The flue gas is in a dry state, and generally does not cause corrosion to the equipment. With the extensive implementation of measures such as waste heat utilization and the environmental protection requirements of flue gas subject to denitrification and desulfurization, the temperature of the ...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/48C22C38/42C22C38/26C22C38/20C22C38/16C22C38/44C22C38/46C22C38/50C22C38/22C22C38/24C22C38/28C21D8/02
CPCC22C38/60C21D8/0226C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 王军尹雨群付军蔡佳兴
Owner NANJING IRON & STEEL CO LTD
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