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Corrosion resistance evaluation method for low alloy structural steel

An evaluation method and technology for low-alloy steel, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., which can solve the problems of inconvenient operation and long experimental period, and achieve the effect of shortening the experimental period and simple experimental process.

Inactive Publication Date: 2020-05-01
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, this method has a long experimental period and is not convenient enough to operate.

Method used

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  • Corrosion resistance evaluation method for low alloy structural steel
  • Corrosion resistance evaluation method for low alloy structural steel
  • Corrosion resistance evaluation method for low alloy structural steel

Examples

Experimental program
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Embodiment

[0024] Table 1 shows the weight percentages of the chemical components of the low-alloy steels in the examples using the method for evaluating the corrosion resistance of low-alloy structural steels according to the present invention. And according to the low-alloy steel corrosion resistance index I calculation formula, the corrosion resistance indices of the eight examples are obtained, as shown in Table 2.

[0025] The chemical composition of eight kinds of embodiments of table 1

[0026]

[0027] Table 2 Atmospheric corrosion resistance index I value of eight test steels

[0028]

[0029] Cut the samples of the eight examples into 10mm×10mm×3mm sheet-like samples along the normal direction, grind them step by step with No. 60-2000 water sandpaper, then mechanically polish the samples, and then clean them with deionized water and acetone , to remove surface oil. Afterwards, according to the "GB / T 10561-2005 Determination of Non-metallic Inclusion Content in Steel Sta...

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Abstract

The invention discloses a corrosion resistance evaluation method for low alloy structural steel. The corrosion resistance evaluation method comprises the steps that four variables of the atmospheric corrosion resistance index I calculated by the element composition of the low alloy structure steel, the pearlite phase content (X1) and the grain size grade (X2) calculated by the metallographic structure, and the inclusion area percentage (X3), under a typical view field, calculated by inclusion observation are substituted into the equation: Y=I-0.062X1+0.10X2-12.1X3, the comprehensive corrosionresistance index Y of the to-be-evaluated low alloy structural steel is obtained, and the corrosion resistance of the low alloy structural steel is judged through the magnitude of Y. According to themethod, consideration factors are comprehensive, the steps are simple, operation is convenient, a large number of simulation and outdoor experiments are not needed, the experimental cycle is short, and more accurate and more reasonable corrosion resistance evaluation standards are conveniently provided for the low alloy structural steel in actual use.

Description

technical field [0001] The invention relates to a method for evaluating the corrosion resistance of low-alloy structural steel, and relates to the field of testing and evaluating metal materials, in particular to the field of evaluating the corrosion resistance of metal materials. [0002] technical background [0003] Low-alloy structural steel has good mechanical properties, welding properties and machinability, and is widely used in high-rise buildings, construction machinery, wind power equipment, pressure vessels, ships and vehicles and other fields. Among them, the traditional ferrite-pearlite dual-phase low-alloy structural steel and bainite single-phase alloy structural high-strength steel have a wide range of applications and face complex corrosion environments, so their corrosion resistance is of great importance to the life and safety of large buildings and machinery. Therefore, it is of great significance to establish a comprehensive, accurate, simple and efficien...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01N21/84
CPCG01N17/006G01N21/84
Inventor 李晓刚黄运华程学群刘超刘智勇
Owner UNIV OF SCI & TECH BEIJING
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