Corrosion-resisting austenitic stainless steel submerged-arc welding wire and production method thereof

Abstract

The invention relates to a corrosion-resisting austenitic stainless steel submerged-arc welding wire and a production method thereof. The corrosion-resisting austenitic stainless steel submerged-arc welding wire is composed of, by mass, 0.015%-0.025% of C, 1.00% of Si or the less, 2.50% of Mn or the less, 0.020% of P or the less, 0.010% of S or the less, 12.00%-14.00% of Ni, 18.00%-20.00% of Cr, 2.00%-3.00% of Mo, 0.05%-0.10% of N and 0.05%-0.10% of Ti. The production method comprises the following steps that dosing, vacuumizing, argon gas filling, energizing, fine melting, cooling, ferrosilicon adding, carbon adding, titanium adding, power cutting and pouring are conducted, and a steel ingot is obtained after cooling; and then steel forging, steel rolling, welding wire finishing drawing and finished product heat treatment are carried out. According to the corrosion-resisting austenitic stainless steel submerged-arc welding wire, an element Nb is replaced with an element Ti, coarsening of austenite crystal grains can be effectively prevented, refining of ferrite crystal grains is achieved, intercrystalline corrosion is avoided, and the corrosion resistance of a welding wire deposited metal is improved. Meanwhile, due to the effect of nickel equivalent elements such as Ni, Mn, C and N which are favorable for formation of austenitic stainless steel, strength of the welding wire deposited metal can be effectively improved, and additionally, the price of titanium is low, so that the production cost can be reduced.

Description

technical field [0001] The invention relates to the field of welding wire technology, in particular to a corrosion-resistant austenitic stainless steel submerged arc welding wire and a production method thereof. Background technique [0002] Austenitic stainless steel is widely used in petroleum, chemical, aerospace and energy fields due to its good ductility, cold and hot workability and localized corrosion resistance at high and very low temperatures. For example, the construction of nuclear power plants requires a large amount of austenitic stainless steel. At present, most of the nuclear power plants under construction in China are pressurized water reactor nuclear power plants, and the temperature inside the reactor is as high as 350°C, which puts forward higher and higher requirements for the high temperature resistance strength of materials. The materials currently used are mainly nitrogen-controlled austenitic stainless steel (304N, 316N, etc.), and this type of ste...

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Problems solved by technology

If conventional stainless steel welding wire is used in tailor welding of this type of steel, the welded joint will have insufficient tensile strength.

[0003] Chinese patent application CN201310531804.X discloses a high-strength austenitic stainless steel submerged arc welding wire, which can be used for welding key components in the PWR nuclear island, and can solve the problem of insufficient mechanical properties of long-term operation welds in the PWR environment problem, but in the manufacturing process, in order to improve its resistance to intergranular corrosion, it is necessary to add noble metal element Nb, resulting in high cost

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