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Continuous annealing and pickling line welding method for martensitic stainless steel

A technology of martensitic stainless steel and welding methods, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of easy cracking of welds, avoid weld fractures, avoid cracking of annealing and pickling lines, and increase protection intensity effect

Active Publication Date: 2020-02-14
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this invention is to provide a martensitic stainless steel continuous annealing and pickling line welding method to solve the problem that the weld seam of martensitic stainless steel coils with a carbon content above 0.5% is easy to crack

Method used

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  • Continuous annealing and pickling line welding method for martensitic stainless steel
  • Continuous annealing and pickling line welding method for martensitic stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The specific MIG welding parameters for 50Cr15MoV stainless steel are shown in Table 1.

[0023]

[0024] The annealing and pickling line requires two volumes of annealed 50Cr15MoV stainless steel with a thickness of 5.0mm before and after welding. First, the welding seam 1 of the steel coil is formed by welding with the corresponding parameters in Table 1 according to the thickness of the steel coil. The welding wire is 309Si and the specification is 1.2mm.

[0025] Rib plate 3 is prepared in advance, the material is 304 annealed, the welding rod material is 309L, and the specification is 2.5*350mm. Ribs 3 have the same size, the specific specification is 4.0 (thickness) * 100 * 300mm, and the surrounding is arc-shaped, the arc radius is 10mm, to avoid stress concentration cracking at the corner, the specific shape is as follows figure 1 shown.

[0026] Use a shearing device with a crescent-shaped incision to cut off the arc-starting and arc-ending sections of the...

Embodiment 2

[0033] The annealing and pickling line requires two volumes of annealed 50Cr15MoV stainless steel with a thickness of 3.0mm before and after welding. First, weld the weld seam 1 of the steel coil with the corresponding parameters in Table 1 according to the thickness of the steel coil. The welding wire is 309Si and the specification is 1.2mm.

[0034] Prepare the rib plate 3 in advance, the material is 304 annealed state, the size of the rib plate 3 is the same, the specific specification is 1.5 (thickness)*100*300mm, and the surrounding is arc-shaped, the radius of the arc is 5mm, to avoid stress concentration cracking at the corner , the specific form is as figure 1 shown.

[0035] Use a shearing device with a crescent-shaped incision to cut off the arc-starting and arc-ending sections of the weld 1 of the steel coil to avoid poor formation of these two places, which will cause cracks to occur first in the arc-starting and arc-ending sections during the operation of the str...

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Abstract

The invention discloses a continuous annealing and pickling line welding method for martensitic stainless steel, and belongs to the field of stainless steel welding. The problem that the welding lineof martensitic stainless steel coils with the carbon content of 0.5% or above is likely to crack is solved. The method includes the following steps that an MIG welding machine is adopted for welding stainless steel coils at the inlet of an annealing and pickling line; a shearing device is used for cutting away the arc striking and arc extinguishing sections of a steel coil welding line to avoid poor forming of the two sections because the arc striking and arc extinguishing sections crack first in the strip steel moving process, which leads to welding line tearing; rib plates are welded to thetwo sides of the steel coil welding line at the same time, and then a rib plate is welded to the middle of the steel coil welding line, wherein it is required to weld the peripheries of the rib platescompletely with no seam left to avoid the situation that acid liquor remains in the seam and contaminates the surface after flowing out; and after the rib plates are welded, air cooling is performedto reduce the martensite formation amount and the hardness of a heat-affected zone. The method can effectively avoid the situation that the welding line of the martensitic stainless steel coils with the carbon content of 0.5% or above cracks in the annealing and pickling line.

Description

technical field [0001] The invention belongs to the field of stainless steel welding, in particular to a martensitic stainless steel continuous annealing pickling line welding method. Background technique [0002] With the development of the domestic knife and scissors market, 50Cr15MoV stainless steel, as a high-carbon martensitic stainless steel, has a hardness of 56-58 HRC after quenching. 50Cr15MoV stainless steel has good corrosion resistance, processability and grindability, and is widely used in the production of high-end knives. There are relatively few domestic steel mills that can produce this type of steel, mainly because its production is difficult, which is mainly reflected in smelting, hot rolling, cold rolling, welding and other processes. When the hot-rolled and cold-rolled coils of this steel type are produced on the annealing and pickling line, in order to ensure continuous production, the coils must be welded by welding machines. The current welding techn...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/32
CPCB23K9/173B23K9/32
Inventor 李照国李聚宝潘吉祥王军伟申德
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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