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Polyphase structure high-grade pipeline steel original austenite grain boundary corrosion agent and application method

A technology of austenite grain boundary and multi-phase structure, which is applied in the field of corrosion agent for original austenite grain boundary of high-grade pipeline steel with multi-phase structure, can solve the problems of easy aging of reagents, low reproducibility, no consideration, etc., and achieve The effect of short corrosion time, convenient preparation and simple operation

Inactive Publication Date: 2016-12-07
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, 1) Aiming at the austenite grain boundary display method under the deformation condition of medium carbon steel, the corrosion time is 1-2min under heating condition; 2) only for the grain boundary corrosion of maraging steel, not suitable for multiphase structure The grain boundary corrosion of pipeline steel; 3) It is aimed at the corrosion of an ultra-low carbon original austenite grain boundary, but the corrosion time reaches 180-220S, and the addition of carbon tetrachloride reagent, sodium chloride and sample is not considered Preparation eliminates the influence of deformation and intermediate corrosion on the corrosion of the original austenite grain boundary, and the reproducibility is not high; 4) The etchant and corrosion method for the metallographic structure of a high-grade pipeline steel require a constant temperature of 50-100°C Corrosion at high temperature will easily cause the volatilization of hydrochloric acid and picric acid in the reagent, the reagent is easy to age, the operator is not easy to carry out the test for a long time and is easy to be poisoned, the practical operability is not strong

Method used

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  • Polyphase structure high-grade pipeline steel original austenite grain boundary corrosion agent and application method
  • Polyphase structure high-grade pipeline steel original austenite grain boundary corrosion agent and application method
  • Polyphase structure high-grade pipeline steel original austenite grain boundary corrosion agent and application method

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Effect test

Embodiment １

[0035] The high-grade X80 pipeline steel with multiphase structure is prepared from the following components in mass percentage: C: 0.04%, Si: 0.20%, Mn: 1.72%, Nb: 0.05%, Mo: 0.20%, Cu: 0.20%, Ni : 0.20%, Ti: 0.018%, Al: 0.01%,.

[0036] 1) Sample preparation process: The sample state is a high-grade pipeline steel sample that has been rolled by TMCP. First, the oxide skin on the surface of the sample is ground off on a grinder, and then the sample is firmly installed on Tegrapol-35 for automatic grinding. On the grinding head of the polishing machine, the corroded surface is automatically finely ground at 100#, 200#, 300#, 600#, 800#, 1000# according to the procedure, and then polished; the polishing agent is 1.5um diamond polishing paste, and the circulating water is used to Use as a lubricant; remove the automatically polished sample and lightly polish it on the silk fabric with clean water for 1 minute until the polished surface of the sample is inclined at an angle of 45...

Embodiment 2

[0042] The high-grade X90 pipeline steel with multiphase structure is prepared from the following components in mass percentage: C: 0.05%, Si: 0.25%, Mn: 1.72%, Nb: 0.06%, Mo: 0.26%, Cu: 0.21%, Ni : 0.20%, Ti: 0.020%, Al: 0.02%,.

[0043] 1) Sample preparation process: The sample state is a high-grade pipeline steel sample that has been rolled by TMCP. First, the oxide skin on the surface of the sample is ground off on a grinder, and then the sample is firmly installed on Tegrapol-35 for automatic grinding. On the grinding head of the polishing machine, the corroded surface is automatically finely ground at 100#, 200#, 300#, 600#, 800#, 1000# according to the procedure, and then polished; the polishing agent is 1.5um diamond polishing paste, and the circulating water is used to Use as a lubricant; remove the automatically polished sample and lightly polish it on the silk fabric with water for 2 minutes until the polished surface of the sample is tilted at an angle of 45° to th...

Embodiment 3

[0049] The high-grade X100 pipeline steel in this example is prepared from the following components by mass percentage: C: 0.06%, Si: 0.35%, Mn: 1.95%, Nb: 0.08%, Mo: 0.20%, Cu: 0.21%, Ni: 0.22%, Ti: 0.018%, V: 0.02%, Al: 0.02%.

[0050] 1) Sample preparation process: The sample state is a high-grade pipeline steel sample that has been rolled by TMCP. First, the oxide skin on the surface of the sample is ground off on a grinder, and then the sample is firmly installed on Tegrapol-35 for automatic grinding. On the grinding head of the polishing machine, the corroded surface is automatically finely ground at 100#, 200#, 300#, 600#, 800#, 1000# according to the procedure, and then polished; the polishing agent is 1.5um diamond polishing paste, and the circulating water is used to Use as a lubricant; remove the sample after automatic polishing, and then lightly polish it on the silk fabric with water for 1.5 minutes until the polished surface of the sample is inclined at an angle ...

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Abstract

The invention discloses a polyphase structure high-grade pipeline steel original austenite grain boundary corrosion agent and an application method. The corrosion agent consists of the following components: mew gull brand detergent, carbon tetrachloride, saturated picric acid solution, sodium chloride, hydrochloric acid solution with a volume concentration of 30%, and ethanol solution. The corrosion agent is convenient for preparation, needs no heating, can be prepared at normal temperature, is simple in operation, is short in corrosion time, is better in reproducibility, and is suitable for large-batch corrosion of polyphase structure pipeline steel.

Description

technical field [0001] The invention relates to the technical field of metallographic inspection and analysis technology, in particular to an original austenite grain boundary corrosion agent for high-grade pipeline steel with multi-phase structure and its use method. Background technique [0002] Pipeline steel plays a pivotal role in national energy transmission. The vigorous development of pipeline steel pipes in my country has mainly experienced three stages: the first stage is about 1980-2000, the first generation of pipeline steel, and the organization of pipeline steel is pearlite -Ferrite, mainly ordinary grade pipeline steel represented by X52-X65, mainly used in the construction of the Shaanxi-Beijing line; from 2000 to 2011, the pipeline steel is mainly acicular ferrite, mainly X70 / X80 pipeline steel Mainly, large-scale application to the construction of the first and second lines of the West-East Gas Pipeline Project. From 2011 to now, the development of multi-phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 牛延龙刘志刚赵慧杰陈晔韩启彪于爽
Owner SHANDONG IRON & STEEL CO LTD
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