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High-strength low-alloy steel resistant to sulfuric acid dew point corrosion

A dew point corrosion, low alloy steel technology, applied in the field of low alloy steel, can solve the problems of sulfuric acid dew point corrosion resistance can not meet the actual production requirements, low strength, fracture damage of bearing parts, etc., to achieve sulfuric acid dew point corrosion resistance performance improvement, mechanical Excellent performance and the effect of reducing the total cost of raw materials

Inactive Publication Date: 2010-05-12
SHANGHAI GENFU METALLURGICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sulfuric acid dew point corrosion resistance of these steels is far from meeting the actual production needs, especially its low strength, which can easily lead to fracture and damage of load bearing parts such as chimneys, oil production platforms, and chemical equipment.

Method used

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  • High-strength low-alloy steel resistant to sulfuric acid dew point corrosion
  • High-strength low-alloy steel resistant to sulfuric acid dew point corrosion
  • High-strength low-alloy steel resistant to sulfuric acid dew point corrosion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: adopt open hearth furnace and electric furnace smelting, rare earth is added in the steel ladle in the tapping process or after tapping, and can be made into plate, pipe, section bar etc. after continuous casting and rolling, and its chemical composition is as follows (weight %): C: 0.07, Si: 0.34, Mn: 0.52, P: 0.011, S: 0.015, Ni: 0.45, Cr: 0.73, Cu: 0.38, Sb: 0.09, Re: 0.10, Mo: 0.06, Nb: 0.04, Ti; 0.07, V: 0.03, Fe: Yu.

[0021] On the steel plate of this embodiment, a sample of 40 × 40 × 4 mm was cut, soaked in 50% sulfuric acid aqueous solution at 70 ° C for 4 hours, and carried out with reference to the standard of GB10124-88 "Metal Material Laboratory Uniform Corrosion Full Immersion Test Method" Sulfuric acid immersion test, the test results are shown in Table 1. The comparison of mechanical properties is shown in Table 2.

[0022] Table 1 Comparison of sulfuric acid dew point corrosion rates of different steels (mm y -1 )

[0023]

[0024] ...

Embodiment 2

[0027] Embodiment 2: the present embodiment is basically the same as the embodiment 1, the difference lies in the composition, the chemical composition of the present embodiment is (% by weight): C: 0.06, Si: 0.38, Mn: 0.57, P: 0.016, S: 0.013 , Ni: 0.54, Cr: 0.84, Cu: 0.41, Sb: 0.11, Re: 0.05, Mo: 0.07, Nb: 0.05, Ti; 0.06, V: 0.02, Fe: Yu.

[0028] On the steel plate of this embodiment, a sample of 40 × 40 × 4mm was intercepted, soaked in 20% sulfuric acid aqueous solution at 30°C for 24 hours, and carried out with reference to the standard of GB10124-88 "Metal Material Laboratory Uniform Corrosion Full Immersion Test Method" Sulfuric acid immersion test, the test results are shown in Table 3, and the comparison of mechanical properties is shown in Table 4.

[0029] Table 3 Comparison of sulfuric acid dew point corrosion rates of different steels (mm y -1 )

[0030]

[0031] Table 4 Comparison of mechanical properties of different steels

[0032]

[0033] *d bend cen...

Embodiment 3

[0034] Embodiment 3: This embodiment is basically the same as Embodiment 1, the difference lies in the composition, the chemical composition of this embodiment is (% by weight): C: 0.10, Si: 0.40, Mn: 1.0, S: 0.05, Ni: 0.6 , Cr: 1.0, Cu: 0.5, Sb: 0.15, Re: 0.10, Mo: 0.10, Nb: 0.10, Ti: 0.10, V: 0.10, and the rest are Fe and inevitable inclusions.

[0035] On the steel plate of this embodiment, a sample of 40 × 40 × 4mm was intercepted, soaked in 20% sulfuric acid aqueous solution at 30°C for 24 hours, and carried out with reference to the standard of GB10124-88 "Metal Material Laboratory Uniform Corrosion Full Immersion Test Method" Sulfuric acid immersion test, the test results are shown in Table 5, and the comparison of mechanical properties is shown in Table 6.

[0036] Table 5 Comparison of sulfuric acid dew point corrosion rates of different steels (mm y -1 )

[0037]

[0038] Table 6 Comparison of mechanical properties of different steels

[0039]

[0040]*d ben...

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Abstract

The invention provides high-strength low-alloy steel resistant to sulfuric acid dew point corrosion, which is characterized in that the steel contains the following components (in percentage by weight): 0.01 to 0.10 percent of C, 0.20 to 0.40 percent of Si, 0.35 to 1.0 percent of Mn, 0.01 to 0 .05 percent of S, 0.3 to 0.6 percent of Ni, 0.5 to 1.0 percent of Cr, 0.3 to 0.5 percent of Cu, 0.01 to 0.15 percent of Sb, 0.01 to 0 .10 percent of Re, 0.01 to 0 .10 percent of Mo, 0.01 to 0 .10 percent of Nb, 0.01 to 0 .10 percent of Ti, 0.01 to 0 .10 percent of V, and the balance of Fe and inevitable impurities, wherein the total content of alloying elements is less than or equal to 3. The invention has a plurality of alloying elements added at the same time, so that the effects of high strength and corrosion resistance are achieved through the small-amount multi-component effect of the alloying elements.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel, and specifically relates to a sulfuric acid dew-point corrosion-resistant high-strength low-alloy steel which utilizes a small amount of multi-element alloying and the synergistic effect between elements to achieve excellent corrosion resistance and high strength. Background technique [0002] Sulfuric acid dew point corrosion-resistant steel is widely used in metallurgy, electric power, petrochemical and other industrial fields, where coal or heavy oil is the main fuel for flue gas treatment systems, such as air preheaters, economizers, flues, chimneys, and railway vehicles in low-temperature parts of boilers , oil derricks, oil production platforms, and desulfurization devices in chemical and petroleum equipment. Domestic research and development of sulfuric acid dew point corrosion-resistant steel started relatively late, and the composition system and use standards generally refer to ...

Claims

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Application Information

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IPC IPC(8): C22C38/60
Inventor 顾业杰
Owner SHANGHAI GENFU METALLURGICAL SCI & TECH
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