Process for welding duplex stainless steel

A duplex stainless steel, welding process technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effect of excellent welding effect
CN101972878AActive Publication Date: 2011-02-16CHINA NAT CHEM ENG NO 7 CONSTR
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT CHEM ENG NO 7 CONSTR
Publication Date
2011-02-16

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Abstract

The invention relates to a process for welding duplex stainless steel, in particular to the process for welding the duplex stainless steel used for high-sulfur content refining equipment, highly-corrosive petrochemical equipment and pipelines, high-parameter power devices, and the chloridion-corroded environments of seawater and the like. In the process, a specific protective gas favorable for the welding of the duplex stainless steel is adopted, and simultaneously limited linear energy and inter-layer temperature are regulated in the welding process, so that the unfavorable defects of the conventional welding process can be overcome, and a metallographic structure with the ferrite content of 30 to 70 percent and a ferritic phase in percentage equivalent to that of an austenitic phase is obtained. A welding joint obtained by the welding process has high mechanical properties, high strength and hardness, particularly high yield strength which is about twice that of austenitic stainless steel, high thermal fatigue resistance, pitting corrosion resistance, crevice corrosion resistance, intercrystalline corrosion resistance and high weldability.
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Description

technical field

[0001] The invention relates to a welding process of duplex stainless steel, especially for duplex stainless steel in the environment of high sulfur content refining equipment, highly corrosive petrochemical equipment, pipelines and high-parameter power devices, and chloride ion corrosion environments such as seawater. Welding process for stainless steel. Background technique

[0002] Duplex stainless steel is a new type of stainless steel material that has developed rapidly in recent years. It has a variety of models, and there are 25 types of steel listed in the ASME code (American Society of Mechanical Engineers), and its classification number is P10H. Since the microstructure of duplex stainless steel is austenite + ferrite structure , so it has good corrosion resistance. Duplex stainless steel has better resistance to stress corrosion cracking than 316L austenitic stainless steel (hereinafter referred to as 316L), especially in H 2 This is the case in ...

Claims

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