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Welding method for high-carbon-equivalent strip steel in continuous annealing

A technology with high carbon equivalent and welding method, which is applied in the direction of welding equipment, furnace type, furnace, etc., can solve the problems that the stability of supercooled austenite cannot pass, the welding quality cannot be obtained, optimization, etc., and achieve the optimization of coil stability , Improve enterprise productivity and economic benefits, and improve the effect of stability

Pending Publication Date: 2021-06-15
HANDAN IRON & STEEL GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the welding process of high-carbon equivalent strip steel, it is still impossible to obtain good welding quality by using such methods for welding the same steel type itself.
Because it is rich in carbon, chromium, molybdenum and other elements, the stability of its supercooled austenite cannot be optimized by the method in the above patent, and its welded structure contains more brittle and hard phases such as martensite and bainite.

Method used

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  • Welding method for high-carbon-equivalent strip steel in continuous annealing
  • Welding method for high-carbon-equivalent strip steel in continuous annealing
  • Welding method for high-carbon-equivalent strip steel in continuous annealing

Examples

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Embodiment 1－10

[0022] Weld the chilled strip steel coil at the entrance of the continuous annealing furnace. The thickness of the strip steel is shown in Table 2. The welding method adopts narrow lap welding. During the welding process, the high carbon equivalent steel coil A and the low carbon equivalent steel coil B are welded. The carbon equivalent steel coil B is welded with another high carbon equivalent steel coil A, that is, the high carbon equivalent and low carbon equivalent steel coils are welded alternately according to the A-B-A-B-A-B... method, high and low The weight percent content of C, Mn, Cr, Mo, V, Ni and Cu of carbon equivalent steel coils is shown in Table 1, and the carbon equivalent is shown in Table 2. The formula for calculating carbon equivalent is Ceq=[C+Mn / 6+(Cr+Mo +V) / 5+(Ni+Cu) / 15]*100%.

[0023] Table 1

[0024]

[0025] Table 2

[0026]

[0027] The microstructure of the welding seam of the strip steel in Example 1-10 was inspected, and the inspection r...

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Abstract

The invention discloses a welding method for high-carbon-equivalent strip steel in continuous annealing. In a continuous annealing process for strip steel, a plurality of steel coils are connected end to end and welded together, then continuous annealing is carried out, and every two adjacent welded steel coils are different in carbon equivalent and comprise the high-carbon-equivalent strip steel and the low-carbon-equivalent strip steel. According to the invention, the problem that the high-carbon-equivalent strip steel is difficult to weld during the continuous annealing can be effectively solved, the risk that the strip steel is broken due to cracking in a welding seam structure is avoided, and the stability of the welding quality is improved; and the production smoothness of the strip steel is ensured, the strip speed of the continuous annealing for a target steel grade is increased, the stability of a furnace area process is improved, the full-coil stability of products is optimized, the production rate of enterprises is increased, and the economic benefits of the enterprises are improved.

Description

technical field [0001] The invention belongs to the technical field of strip steel continuous annealing production, in particular to a welding method for high carbon equivalent strip steel during continuous annealing. Background technique [0002] In the continuous annealing process of high-strength steel strips, welding is the first step in the continuous annealing production process. The strips are continuously welded by head-to-tail welding. Afterwards, the strip enters the furnace area for production according to a specific process, so continuous and stable welding quality is a prerequisite for smooth continuous annealing production. The quality of welding affects the belt speed stability of continuous annealing and the process of the furnace area, and further affects the coil stability of the product. [0003] Among the continuously annealed products, the strip steel varieties with high carbon equivalent are mainly concentrated in high-strength steel products. This ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K31/12C21D1/26C21D6/00C21D9/56C22C38/04C22C38/38
CPCB23K31/02B23K31/12C21D1/26C21D6/005C21D6/002C21D9/56C22C38/04C22C38/38
Inventor 贾亚飞李守华刘自权刘鹏白瑞召马子洋陈小虎
Owner HANDAN IRON & STEEL GROUP
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