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Austenitic stainless steel submerged-arc welding agent

A technology of submerged arc flux and austenitic system, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve the problems of increasing the sensitivity of high temperature cracks in welding parts and reducing the strength, and achieve the effect of excellent welding workability

Inactive Publication Date: 2020-05-22
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low ferritization of the weld metal will increase the high-temperature crack susceptibility of the welded part, and there are also problems such as a decrease in strength

Method used

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  • Austenitic stainless steel submerged-arc welding agent
  • Austenitic stainless steel submerged-arc welding agent
  • Austenitic stainless steel submerged-arc welding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] The specific components and contents of the austenitic stainless steel submerged arc flux used in the examples of the present invention are shown in Table 5.

[0035] About the workability test of the flux of the present invention, be to use composition as shown in Table 4, the specification is the welding wire of Φ 3.2mm and the austenitic stainless steel submerged arc welding flux as shown in Table 5, according to the composition shown in Table 1 Welding conditions, made of 304 stainless steel plate, groove form such as figure 1 (plate thickness t 1 =20mm, bevel angle unilateral β 1 = 30°) in the parent metal indicated by flat welding, and visually observe the high temperature cracks, wettability, weld bead shape, corrugation thickness, slag detachability and presence or absence of indentation to evaluate .

[0036] The evaluation methods for high-temperature cracks, wettability, bead shape, waviness, slag detachability and presence or absence of indentation are as...

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Abstract

The invention discloses an austenitic stainless steel submerged-arc welding agent. The austenitic stainless steel submerged-arc welding agent is prepared from the following components in percentage byweight: 10-35% of a fluoride of an F equivalent value, 10-35% of MgO, 7-17% of Al2O3, 10-25% of SiO2, less than 0.05% of P2O5, less than 0.05% of SO3, 15-30% of CaO, 0.5-10% of ZrO2, 0.2-3% of BaO, 0.015-0.40% of rare earth elements, and the balance of inevitable impurities. The austenitic stainless steel submerged-arc welding agent has the excellent welding operation performance, meanwhile, theaustenitic stainless steel submerged-arc welding agent can further reduce welding defects and improve the degree of purity of high-welding metal, and the welding metal obtained by the welding agent still has excellent extremely low temperature impact toughness and anti-cracking ability after being treated at 400-600 DEG C.

Description

technical field [0001] The invention belongs to the field of welding materials. Specifically, the invention relates to a submerged arc welding flux for austenitic stainless steel. Background technique [0002] Austenitic stainless steel represented by 304 is widely used in chemical storage tanks, chemical storage tank trucks and building structures due to its excellent corrosion resistance, tensile strength and toughness. Austenitic stainless steel has good ultra-low temperature toughness due to its structure, and it also has good crack resistance due to the appropriate amount of ferrite. [0003] However, after this austenitic stainless steel is subjected to a heat treatment temperature of 500-800°C, its ferrite will transform into σ-ferrite, resulting in a decrease in toughness at very low temperatures. In order to improve the toughness of the weld metal, the amount of ferrite, which was set in the past to prevent high-temperature cracks from about 7 to 10, is generally r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K35/36
CPCB23K9/18B23K35/3601
Inventor 周峙宏吴承懋
Owner KUSN GINTUNE WELDING
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