Intergranular corrosion resistant austenitic system stainless steel

A technology of austenitic stainless steel and austenitic system, applied in the field of austenitic stainless steel, can solve problems such as corrosion, stainless steel hot crack intergranular, etc., achieve the effect of preventing hot crack and improving intergranular corrosion resistance

Inactive Publication Date: 2012-10-17
JIANGSU XINGHAI SPECIAL STEEL
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Problems solved by technology

[0005] The purpose of the present invention is to provide an anti-intergranular corrosion austenitic stainless steel to solve the problems of thermal cracks and intergranular corrosion during welding of stainless steel existing in the prior art

Method used

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  • Intergranular corrosion resistant austenitic system stainless steel
  • Intergranular corrosion resistant austenitic system stainless steel

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Embodiment

[0022] As shown in Table 1, the components of the austenitic stainless steels in Examples 1, 2, 3, and 4 and their mass percentage (wt%) balance are Fe, and the austenitic stainless steels in Examples 1, 2, 3, and 4 are preferably Welding is performed with a linear energy of 1kJ / cm, and the cooling rate is 30°C / s, and the interlayer temperature of the multilayer welding is 70°C.

[0023] Table 1 Austenitic stainless steel components and their mass percentages (wt%) in Examples 1, 2, 3, and 4

[0024] C Si mn P S Cr Ni Ti Example 1 0.08 0.73 1.95 0.03 0.016 24.6 11.4 0.75 Example 2 0.065 0.42 2.07 0.03 0.010 26.2 12.3 0.80 Example 3 0.02 0.35 1.55 0.02 0.015 26.4 11.2 0.65 Example 4 0.09 0.9 2.4 0.02 0.018 24.2 13 1.0

[0025] Ti is added to the intergranular corrosion-resistant austenitic stainless steel of Examples 1, 2, 3, and 4, so that the mass percentage of Ti is preferably 0.75%, 0.80%, 0.65%,...

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Abstract

The invention provides an intergranular corrosion resistant austenitic system stainless steel, which comprises the following components by mass percentage (wt%): Less than 0.10 or equal to C, 0.35-1.0 of Si, 1.55-8.0 of Mn, less than or equal to 0.018 of S, 18.6-26.4 of Cr, 8.1-13 of Ni, 0.62-1.0 of Ti and the balance of Fe; According to the austenitic system stainless steel, compared to Cr, the added Ti is easier to combine with carbon to form stable carbide, when the Ti addition is greater than 5 times of the carbon amount, a majority of carbon is existed in the Ti carbide, the mass fraction of the solid solution carbon is decreased to lower than 0.03%, and the effective solid solution concentration of Cr in the steel can be ensured, thereby the intergranular corrosion resistant capability of the stainless steel can be improved. The flyer energy welding, the rapid cooling and multilayer welding with low interlayer temperature are used for ensuring the welding line to contain a proper amount of ferrite, thereby the generation of the hot crack can be prevented.

Description

technical field [0001] The invention relates to an austenitic stainless steel, in particular to an anti-intergranular corrosion austenitic stainless steel. Background technique [0002] Austenitic stainless steel has the following physical properties: 1. Large coefficient of linear expansion, 2. Good corrosion resistance, 3. Excellent plasticity, 4. High temperature resistance, 5. Good low temperature resistance. However, the influencing factors of hot cracking and intergranular corrosion are the primary considerations for the welding of this type of stainless steel. [0003] When the stainless steel with intergranular corrosion is subjected to stress, it will fracture along the grain boundary and its strength will almost completely disappear. This is one of the most dangerous forms of damage to stainless steel. Intergranular corrosion can occur in the heat-affected zone (HAZ), weld or fusion line of the welded joint, and the intergranular corrosion on the fusion line is...

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Application Information

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IPC IPC(8): C22C38/58
Inventor 刘庄根计建康邱爱华孙建平
Owner JIANGSU XINGHAI SPECIAL STEEL
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