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390MPa-grade cold-rolled dual-phase steel and welding method of acid rolling process thereof

A welding method, 1.390mpa technology, applied in the direction of welding equipment, welding medium, welding equipment, etc., can solve the problems of thin welding thickness, unable to provide guidance and basis for welding methods, etc.

Pending Publication Date: 2022-05-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the welding thickness of the finished product of this technical scheme is relatively thin and does not provide a basis for the production rhythm and transition material selection, and cannot provide guidance for the welding method of the 390MPa cold-rolled dual-phase steel acid rolling process

Method used

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  • 390MPa-grade cold-rolled dual-phase steel and welding method of acid rolling process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 390MPa grade cold-rolled dual-phase steel (chemical composition: 0.065%C, 0.01%Si, 0.65%Mn, 0.011%P, 0.005%S, 0.032%Als) with a coil temperature of 58°C and a size of 3.65*1450mm, Its carbon equivalent is 0.176) after cutting off 2.4mm from the tail of the steel coil, it is compared with 390LA (chemical composition: 0.050%C, 0.080%Si, 0.28%Mn, 0.010%) with a temperature of 55℃ and a size of 3.50*1420mm. P, 0.008% S, 0.033% Als, 0.020% Nb, its carbon equivalent is 0.092), the head of the steel coil is sheared 3.3mm, and the welding current is 12.5kW and the speed of 5.7m / min is used for welding. The welding seam after welding by the above welding process is smooth and smooth, no nodules, no welding scars, no welding penetration, no cracking along the welding seam, and good crescent bending effect in the cupping test. A belt breakage accident caused by a weld occurs.

Embodiment 2

[0047] 390MPa grade cold-rolled dual-phase steel (chemical composition: 0.072%C, 0.02%Si, 0.70%Mn, 0.010%P, 0.004%S, 0.037%Als) with a coil temperature of 53°C and a size of 3.25*1360mm Its carbon equivalent is 0.183) after cutting off 3.5mm from the tail of the steel coil, it is combined with St37-2G (chemical composition: 0.09%C, 0.01%Si, 0.35%Mn, 0.015%P, 0.008%S, 0.045%Als, its carbon equivalent is 0.15) the head of the steel coil is cut 3.4mm, and the welding current is 12.3kW and the speed of 5.8m / min is used for welding. The welding seam after welding by the above welding process is smooth and smooth, no nodules, no welding scars, no welding penetration, no cracking along the welding seam, and good crescent bending effect in the cupping test. A belt breakage accident caused by a weld occurs.

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Abstract

The invention discloses 390MPa-grade cold-rolled dual-phase steel and a welding method of an acid rolling process thereof. The 390MPa-grade cold-rolled dual-phase steel comprises the following components: 0.03-0.09% of C, less than or equal to 0.10% of Si, 0.30-0.90% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.010-0.080% of Als and less than or equal to 0.008% of N; and the rest elements are Fe and inevitable impurities. And in the welding step, 390MPa-grade cold-rolled dual-phase steel is selected as a connecting material, after the connecting material and the raw material steel coil are sheared, the welding surfaces of the connecting material and the raw material steel coil are aligned and are positioned on the same horizontal plane, then welding is performed, after welding, a welding seam is subjected to post-welding annealing and polishing treatment, and the quality of the welding seam is inspected by measuring the thickness of the welding seam and performing a cup drawing test. Therefore, the technical problems of instability and low production efficiency in the production process in the prior art are effectively solved, and the purpose of ensuring stable and efficient production in the acid rolling process of the 390MPa-grade cold-rolled dual-phase steel is achieved.

Description

technical field [0001] The invention relates to the technical field of steel rolling production technology, in particular to a 390MPa-grade cold-rolled dual-phase steel and a welding method for a 390-MPa-grade cold-rolled dual-phase steel acid rolling process. Background technique [0002] Using welding equipment to weld the front and rear steel coils together to achieve continuous production in iron and steel enterprises is an important technological means to improve production efficiency and reduce production costs. It is widely used in pickling rolling unit, continuous annealing / galvanizing unit, etc. to achieve continuous and efficient production. Laser welding is a method of welding by bombarding the heat generated by the weldment with a focused laser beam as an energy source. Due to the optical properties of laser light such as refraction and focusing, laser welding has the characteristics of low heat input, small welding deformation, and is not affected by electromag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/60B23K26/14B23K35/38C22C38/02C22C38/04C22C38/06C22C38/12G01N3/08G01N19/00
CPCB23K26/24B23K26/60B23K26/14B23K35/383C22C38/02C22C38/04C22C38/06C22C38/12G01N3/08G01N19/00Y02P10/25
Inventor 余灿生苏冠侨常智渊郑之旺张达富周磊磊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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