High-efficiency 309Nb single-layer strip surfacing sintering flux used in EQ309LNb welding strip and preparation method thereof
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A technology of sintering flux and 309nb, which is applied in welding equipment, manufacturing tools, welding media, etc., can solve problems such as unrealizable and cooperative welding, and achieve the effect of improving work efficiency and shortening the manufacturing period
Inactive Publication Date: 2019-11-05
HARBIN WELL WELDING CO LTD +2
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[0004] The purpose of the present invention is to solve the problem that it is impossible to cooperate with welding with 309Nb welding strip at a welding speed of 400-500mm / min to improve work efficiency
Method used
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specific Embodiment approach 1
[0018] Specific embodiment one: A kind of high-efficiency 309Nb single-layer strip surfacing welding sintered flux used in conjunction with the EQ309LNb welding strip of this embodiment is characterized in that it is composed of: CaF by weight 2 70-80 parts, Al 2 o 3 15-20 parts, SiO 2 4-10 parts, 2-8 parts of CaO, 1-5 parts of MgO, 1-2 parts of alloying agent and 10-15 parts of binder;
[0019] The composition of the EQ309LNb welding strip in mass percentage is: C≤0.02%, Si≤0.65%, Mn 1.5-2.5%, Cr 23.0-25.0%, Ni 12.0-13.0%, Nb 0.7-1.0%, Nb ≤0.06%, Cu≤0.20%, S≤0.010%, P≤0.020%, Mo≤0.20, and the rest is Fe.
specific Embodiment approach 2
[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the sintered flux is composed of: CaF 2 74~80 parts, Al 2 o 3 18~20 parts, SiO 2 5-8 parts, 3-7 parts of CaO, 1.5-4 parts of MgO, 1.3-2 parts of alloying agent and 12-15 parts of binder. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the sintered flux is composed of: CaF 2 74~77 parts, Al 2 o 3 16~20 parts, SiO 2 5-8 parts, 3-6 parts of CaO, 2-4 parts of MgO, 1.5-2 parts of alloying agent and 12-15 parts of binder. Others are the same as in the first embodiment.
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Abstract
The invention discloses high-efficiency 309Nb single-layer strip surfacing sintering flux used in EQ309LNb welding strip and a preparation method thereof, and relates to a sintering flux and a preparation method thereof. The sintering flux and the preparation method thereof aims to solve the problem that the sintering flux cannot be welded with the 309Nb welding strip in a matched mode at 400-500mm per minute, and improve the working efficiency. The sintering flux comprises the following components of, in parts by weight, 70-80 parts of CaF2, 15-20 parts of Al2O3, 4-10 parts of SiO2, 2-8 partsof CaO, 1-5 parts of MgO, 1-2 parts of an alloying agent and 10-15 parts of a binding agent. After mixing the above components, granulating and sintering in turn, the sintering flux is obtained. Whenthe sintering flux is matched and welded with the 309 Nb welding strip surfacing, the efficiency is improved by 60-100% compared with that of a common single-layer strip surfacing and the efficiencyis improved by 33-67% compared with that of the high-speed strip-electrode surfacing. The flux and the method are applied to the field of surfacing.
Description
technical field [0001] The invention relates to the field of sintered flux, in particular to a high-efficiency 309Nb single-layer strip surfacing sintered flux used in conjunction with EQ309LNb welding strips and a preparation method. Background technique [0002] At present, with the enlargement of the hydrogenation process equipment, the area of the corrosion-resistant lining on the inner wall of the equipment needs to be surfacing. The stainless steel corrosion-resistant layer is surfacing inside the reactor, and efficient and fast strip surfacing is usually used. Double-layer strip surfacing welding is a commonly used surfacing welding process at present, but the primary problem of this method is that the manufacturing period is long and the use of welding materials is large, which increases the production cost of the equipment manufacturing plant and restricts the equipment manufacturing plant. develop. Single-layer strip surfacing welding is a surfacing welding meth...
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