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Low alloy steel with yield strength of 300Mpa grade and splicing method

A low-alloy steel, yield strength technology, applied in the field of low-alloy steel, can solve the problems of production rhythm raw material requirements introduction, reference and promotion significance are not significant, not conducive to alloy steel welding, etc., to achieve the effect of stable production

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

The welding quality control system of its laser welding process uses the SQL Server 2000 database to realize the welding of St12 cold-rolled finished products, but does not control the production rhythm, transition material selection basis, raw material requirements, leading / tailing treatment, weld quality evaluation, etc. A detailed introduction is not conducive to the use of laser welding equipment to complete the welding of low-alloy steel with a yield strength greater than 300MPa, and the reference and promotion significance for the production of low-alloy steel with a yield strength greater than 300MPa by the same type of equipment at home and abroad is not significant

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment

[0049] 1) The purpose of the present invention is to provide a method for welding a low-alloy steel with a yield strength greater than 300 MPa in an acid rolling process. Good quality, shearing process and quality, shearing process and quality, key welding process (wire selection, laser power, welding speed, wire feeding process) are controlled to obtain good weld quality and ensure the stability and efficiency of the pickling process. It provides guidance for the production of low-alloy steel with yield strength greater than 300MPa by similar units at home and abroad.

[0050] 2) The technical scheme realized by the present invention is: the chemical composition range of a low-alloy steel with a yield strength greater than 300MPa is: C: 0.04-0.12%, Si≤0.12%, Mn: 0.25-0.65%, P≤0.020%, S≤0.010%, Als: 0.010%~0.080%, N≤0.008%, Nb≤0.05% and the remaining elements are Fe and inevitable impurities.

[0051] 3) In the preferred low-alloy steel with a yield strength greater than 300M...

Embodiment 1

[0062] 1) 300LA (chemical composition: 0.070%C, 0.075%Si, 0.40%Mn, 0.012%P, 0.005%S, 0.043%Als, 0.015%Nb) with a coil temperature of 55°C and a specification of 3.6mm×1345mm, Its carbon equivalent is 0.14) after shearing 3.7mm from the tail of the steel coil, it is combined with 300LA (chemical composition: 0.081%C, 0.080%Si, 0.35%Mn, 0.010%P, 0.008%S, 0.033%Als, 0.023%Nb, the carbon equivalent is 0.15) the head of the steel coil is cut 3.7mm, and the welding current is 12.5kW and the speed of 5.0m / 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.

[0063] 2) 300LA (chemical composition: 0.075%C, 0.072%Si, 0.38%Mn, 0.010%P, 0.003%S, 0.050%Als, 0.023%Nb) with a coil temperature of 53°C and a specification of 3.75mm×1450mm, Its ca...

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Abstract

The invention discloses low alloy steel with the yield strength of 300 Mpa and a splicing method, and belongs to the technical field of steel plate acid rolling processes. The invention provides the low-alloy steel with the yield strength of 300Mpa grade, which can ensure that the pickling and rolling process is stable and the production is efficient. The invention also provides a splicing method for the low-alloy steel. The low alloy steel at least comprises the following components in parts by weight: 0.04 to 0.12 percent of C, less than or equal to 0.12 percent of Si, 0.25 to 0.65 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.010 to 0.080 percent of Als, less than or equal to 0.008 percent of N, less than or equal to 0.05 percent of Nb and the balance of Fe and inevitable impurities. The splicing method comprises the following steps: by taking a plurality of 300Mpa-grade low-alloy steel coils of which the widths and the thicknesses are matched with each other as splicing objects, trimming the ends, which need to be spliced, of the low-alloy steel coils, and then connecting the low-alloy steel coils into an integral ultra-long continuous steel strip in a manner of laser welding in a manner that every two low-alloy steel coils are opposite to each other in the length direction.

Description

technical field [0001] The invention relates to a low-alloy steel, in particular to a low-alloy steel with a yield strength of 300 Mpa, which belongs to the technical field of pickling rolling of steel plates. The invention also relates to a splicing method for said low alloy steel. 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 no...

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
CPCB23K26/24B23K26/60B23K26/14B23K35/383C22C38/02C22C38/04C22C38/06C22C38/12G01N3/08G01N19/00
Inventor 余灿生苏冠侨常智渊郑之旺王敏莉周磊磊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP