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Method for measuring and calculating sulfuric acid corrosion resisting equivalent of steel material

A corrosion-resistant and sulfuric acid-resistant technology, applied in the field of measuring the sulfuric acid dew point corrosion resistance of steel, can solve the problems of lack of accurate and unified composition control range and standards, long test period, sulfuric acid dew point corrosion, etc., and achieve significant economic benefits and efficiency. Social benefits, saving resources and energy consumption, and meeting the effect of corrosion resistance requirements

Active Publication Date: 2013-03-27
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the past, most of the tobacco leaf baking furnaces were made of ordinary carbon structural steel plates. Due to the high sulfur content of the coal used (up to 2%), the flue gas contained a large amount of SO 2 and SO 3 , easy to cause sulfuric acid dew point corrosion, and the service life is very low
[0003] Several steel mills identified by China Tobacco Company to produce sulfuric acid dew point corrosion-resistant steel have different raw material conditions, equipment levels, and corrosion-resistant performance formulas (chemical composition design), and the corresponding products have large differences in corrosion-resistant performance. There is no relevant information. More accurate and unified composition control range and standards, the final corrosion resistance can only be determined by the sulfuric acid corrosion resistance test in the laboratory, and the tobacco system can only be tested for the tobacco oven when it is inspected and accepted on the spot. The chemical composition of the furnace itself is subject to on-site non-destructive testing, and it is inconvenient to conduct acid resistance tests on a large number of furnaces that have been randomly inspected (damage sampling, long test period). There is no clear correspondence between the chemical composition analysis value and the corrosion resistance of the furnace body. Qualitative reference basis, the final judgment can only be based on whether the chemical composition meets the composition requirements of each company, causing inconvenience and confusion in the application and management of the tobacco system

Method used

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  • Method for measuring and calculating sulfuric acid corrosion resisting equivalent of steel material
  • Method for measuring and calculating sulfuric acid corrosion resisting equivalent of steel material
  • Method for measuring and calculating sulfuric acid corrosion resisting equivalent of steel material

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The chemical composition of the known samples A1~A6 and the actual measured corrosion rate are shown in Table 1:

[0018]

[0019] Let α=100, β=100, γ=100, δ=100, φ=1000, ζ=1000, η=500, θ=100, μ=10, respectively calculate the corrosion resistance equivalent of each sample:

[0020] Corrosion resistance equivalent A1= =1.915

[0021] In the same way, the corrosion resistance equivalent A2=2.012; A3=0.160; A4=2.966; A5=1.939; A6=4.476.

[0022] According to the corrosion resistance equivalent calculated above and the measured corrosion rate, linear regression is performed to obtain y'=8.6991x' -0.6353 , coefficient of determination R 2 =0.9639, after conversion, the equation is obtained: y=8.6991x -0.6353 , where x is the corrosion resistance equivalent of the sample to be tested under the same process conditions, and y is the annual corrosion rate calculated based on the composition (mm / year, mm / y).

Embodiment 2

[0024] The chemical composition of the known samples B1~B6 and the actual measured corrosion rate are shown in Table 2:

[0025]

[0026] Let α=120, β=120, γ=120, δ=120, φ=900, ζ=900, η=600, θ=120, μ=12, respectively calculate the corrosion resistance equivalent of each sample:

[0027] Corrosion resistance equivalent B1= =1.278

[0028] In the same way, the corrosion resistance equivalent B2=0.193; B3=4.882; B4=4.764; B5=4.170; B6=3.703.

[0029] According to the corrosion resistance equivalent calculated above and the measured corrosion rate, linear regression is performed to obtain y'=14.102x' -0.4003 , coefficient of determination R 2 =0.9760, after conversion, the equation is obtained: y=14.102x -0.4003 , where x is the corrosion resistance equivalent of the sample to be tested under the same process conditions, and y is the annual corrosion rate calculated based on the composition (mm / year, mm / y).

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Abstract

The invention discloses a method for measuring and calculating sulfuric acid corrosion resisting equivalent of a steel material. The corrosion resisting equivalent is measured and calculated according to the following corrosion resisting equivalent model, wherein the corrosion resisting equivalent is described in the specification, wherein Ti, Cu, Cr, Ni, Sb, S, P, C and Mn respectively represent percent contents of corresponding elements in the steel material, and alpha, beta, gamma, delta, phi, zeta, eta, theta and mu respectively represent corrosion coefficients of corresponding elements. The method has the advantages of avoiding the problem of incapability of judging whether the corrosion resisting property of the steel material reaches the standard after the steel material is produced according to the component control range formulated by all factories, being short in detection period, lowering production cost, reducing resource and energy consumption, being capable of meeting the requirement of corrosion resistance of a tobacco oven, and achieving remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a method for measuring and calculating the sulfuric acid dew point corrosion resistance performance of steel materials. Background technique [0002] In the past, most of the tobacco leaf baking furnaces were made of ordinary carbon structural steel plates. Due to the high sulfur content of the coal used (up to 2%), the flue gas contained a large amount of SO 2 and SO 3 , easy to cause sulfuric acid dew point corrosion, and the service life is very low. [0003] Several steel mills identified by China Tobacco Company to produce sulfuric acid dew point corrosion-resistant steel have different raw material conditions, equipment levels, and corrosion-resistant performance formulas (chemical composition design), and the corresponding products have large differences in corrosion-resistant performance. There is no relevant information. More accurate and unified composition control range and standards, the final corrosion resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
Inventor 吴光耀邹荣曹重陈伟杜顺林周明珠
Owner WUKUN STEEL
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