Austenitic stainless steel

A technology of austenitic stainless steel and stainless steel, applied in the field of stainless steel, can solve the problems of thermal strength and durability that need to be further strengthened, and achieve the effect of improving intergranular corrosion resistance, improving strength and high-temperature mechanical properties, and beautiful molding

Inactive Publication Date: 2012-10-17
JIANGSU XINGHAI SPECIAL STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the influencing factors of hot cracks and intergranular corrosion are the primary considerations for this type of stainless steel welding, and its thermal strength and durability need to be further strengthened

Method used

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  • Austenitic stainless steel
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Examples

Experimental program
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Embodiment 1

[0026] The test conditions of the intergranular corrosion tendency test of Example 1 and the comparative example are: the sample size is 10mm×10mm×5mm, and 1cm is left on the front side. 2 On the research surface, a wire with a plastic skin is welded on the back side, and the rest of the sample is inlaid with polystyrene. The oxalic acid electrolytic etching method in the "Test Method for Intergranular Corrosion Tendency of Stainless Acid-resistant Steel" is used to determine Test the tendency of intergranular corrosion of steel. by figure 1 It can be seen that there are some small etch pits on the etched surface of the stainless steel of Example 1, and the depth of the etch is not large, while the surface of the austenitic stainless steel of the comparative example has inter-etching pits along the boundary of the ferrite precipitate phase. The phenomenon of interconnection, that is, the formation of etch grooves, as a result, the intergranular corrosion resistance of the auste...

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Abstract

The invention provides an austenitic stainless steel, which comprises the following components by mass percent (wt%): no greater than 0.08 of C, 0.5-1.0 of Si, less than or equal to 0.80 of Mn, less than or equal to 0.030 of P, less than or equal to 0.018 of S, 19-21 of Cr, 10.0-12 of Ni, 2.5-3.0 of Mo, 0.6-1.0 of Ti, 0.6-0.9 of Nb and the balance of Fe; according to the austenitic stainless steel, 0.6-0.9 of Nb, 0.6-1.0 of Ti and 2.5-3.0 of Mo are added, thereby the intergranular corrosion resistant ability can be effective improved, the satisfied pitting corrosion resistance performance is difficult to obtain even the Cr content is high if the stainless steel contains no Mo, Mo can perform the effect only in the Cr steel, The capability for increasing the pitting corrosion resistance performance by Mo in the austenitic stainless steel is 3 times than that of Cr, and the strength and the high temperature mechanical property of the stainless steel can be enhanced and 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 a stainless steel, in particular to an austenitic stainless steel. Background technique [0002] The thermal strength and durability of stainless steel are two important quality criteria. Thermal strength refers to the ability of heat-resistant steel to resist plastic deformation and damage under the combined action of high temperature and load. When evaluating the mechanical properties of materials under high temperature conditions, thermal strength must be used to evaluate. Although austenitic stainless steel has the following physical properties: 1. Large linear expansion coefficient, 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, and its thermal strength and durability need to be further stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50B23K31/02B23K103/04
Inventor 刘庄根计建康邱爱华孙建平
Owner JIANGSU XINGHAI SPECIAL STEEL
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