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Sulphuric acid dew point corrosion resisting steel and method for producing same

A dew point corrosion, sulfuric acid resistance technology, applied in metal rolling, electric furnace, furnace and other directions, can solve the problem that acid resistance can not fully meet user requirements, low cost and high cost

Inactive Publication Date: 2011-05-18
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, under the premise of the same quality and performance, considering the alloy cost, the Cu-Cr series products have the lowest cost, and the acid resistance cannot fully meet the user's requirements, while the Cu-Cr-Sb(Sn) series products are also added with Mo, W and other alloying elements. most expensive
[0008] However, there is no successful experience at home and abroad in the development and production of sulfuric acid dew point corrosion-resistant steel using the thin slab continuous casting and rolling production process.

Method used

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  • Sulphuric acid dew point corrosion resisting steel and method for producing same
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  • Sulphuric acid dew point corrosion resisting steel and method for producing same

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Effect test

Embodiment 1

[0038] The preparation method of sulfuric acid dew point corrosion-resistant steel described in this implementation, its technological process: electric furnace with refining furnace smelting, refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling Pick.

[0039] Among them, the main chemical composition of molten steel after refining is mass percentage (wt%): C: 0.030%, Si: 0.25%, Mn: 1.0%, P: 0.005%, S: 0.004%, Cu: 0.15%, Cr: 1.0 %, Ni: 0.04%, Sb: 0.15%, Ti: 0.010%, N: 10PPm, and the rest is composed of Fe and unavoidable impurities.

[0040] Thin slab continuous casting and rolling process parameters are: continuous casting at a pulling speed of 3.5m / min, casting slab entering furnace temperature at 900°C, soaking temperature at 1100°C, start rolling temperature at 1040°C, finish rolling temperature at 850°C, The coiling temperature was 550°C.

Embodiment 2

[0042] The preparation method of sulfuric acid dew point corrosion-resistant steel described in this implementation, its technological process: electric furnace with refining furnace smelting, refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling Pick.

[0043] Among them, the main chemical composition of molten steel after refining is mass percentage (wt%): C: 0.040%, Si: 0.15%, Mn: 0.45%, P: 0.008%, S: 0.004%, Cu: 0.20%, Cr: 0.45 %, Sb: 0.040%, Ni: 0.08%, Ti: 0.020%, N: 30PPm, Ni / Cu: 0.4, and the rest is composed of Fe and unavoidable impurities.

[0044] Thin slab continuous casting and rolling process parameters are: continuous casting at a pulling speed of 3.8m / min, slab entering furnace temperature is 920°C, soaking temperature is 1120°C, start rolling temperature is 1060°C, finish rolling temperature is 860°C, The coiling temperature was 560°C.

Embodiment 3

[0046] The preparation method of sulfuric acid dew point corrosion-resistant steel described in this implementation, its technological process: electric furnace with refining furnace smelting, refining, thin slab continuous casting, continuous casting slab soaking, high-pressure water descaling, controlled rolling, controlled cooling, coiling Pick.

[0047] Among them, the main chemical composition of molten steel after refining is mass percentage (wt%): C: 0.055%, Si: 0.25%, Mn: 0.65%, P: 0.015%, S: 0.012%, Cu: 0.25%, Cr: 0.65% %, Sb: 0.075%, Ni: 0.125%, Ti: 0.030%, N: 50PPm, Ni / Cu: 0.5, and the rest is composed of Fe and unavoidable impurities.

[0048] Thin slab continuous casting and rolling process parameters are: continuous casting at a pulling speed of 4.5m / min, casting slab entering furnace temperature at 950°C, soaking temperature at 1150°C, starting rolling temperature at 1080°C, finishing rolling temperature at 900°C, The coiling temperature was 600°C.

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Abstract

The invention discloses sulphuric acid dew point corrosion resisting steel and a method for producing the same by continuously casting and rolling a thin steel billet with an electric furnace. The molten steel comprises the following chemical components by weight percent: 0.03-0.08 percent of C, 0.10-0.45 percent of Si, 0.40-1.0 percent of Mn, 0.025 percent of P or less, 0.035 percent of S or less, 0.15-0.50 percent of Cu, 0.40-1.0 percent of Cr, 0.02-0.15 percent of Sb, 0.04-0.30 percent of Ni and 0.01-0.05 percent of Ti and also comprises 100ppm of N or less. The thin steel billet is continuously cast at the speed of 3.5-5.5m / min, and the cast thin steel billet is placed in the electric furnace of 900-1050 DEG C, soaked at 1100-1200 DEG C, rolled at 1040-1120 DEG C, finally rolled at 850-920 DEG C and winded at 550-650 DEG C. The Cu-Cr-Sb composite micro-alloyed sulphuric acid dew point corrosion resisting steel having good mechanical performance, welding performance and corrosion resisting performance can be produced by continuously casting and rolling the thin steel billet with the electric furnace.

Description

technical field [0001] The invention belongs to the technical field of production of sulfuric acid dew point corrosion resistant steel, in particular relates to a sulfuric acid dew point corrosion resistant steel and a preparation method thereof. Background technique [0002] 3.1 Application fields and development significance of acid-resistant steel [0003] Sulfuric acid dew point corrosion resistant steel is a kind of steel resistant to both sulfuric acid dew point corrosion and atmospheric corrosion. Heat exchangers for ovens, air preheaters for low-temperature parts of boilers, economizers, flues, chimneys, and desulfurization devices. [0004] Sulfuric acid dew point corrosion refers to various forms of sulfur oxides contained in boiler flue gas that uses higher sulfur content fuels. Condensation on parts, causing sulfuric acid dew point corrosion. [0005] As the global energy becomes increasingly tense, along with the massive mining and use of fossil fuels such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21C5/52B21B1/46
CPCY02P10/20
Inventor 毛新平林振源许传棻
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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