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Manufacturing method for low-alloy super-thick steel plates with excellent low-temperature toughness

A technology of extra-thick steel plate and low-temperature toughness, which is applied in the field of manufacturing low-alloy extra-thick steel plate, can solve problems such as low strength and toughness, and large difference in grain structure, and achieve low impact performance, deep rolling deformation, and improved rolling. The effect of compression ratio

Inactive Publication Date: 2021-02-05
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing low-alloy extra-thick steel plates with excellent low-temperature toughness. The combination of rolling and heat treatment processes solves the problem of crystal grains at different thickness positions in conventional rolling extra-thick low-alloy steel plates due to the inability of rolling to penetrate the interior. The problems of large differences in grain structure, low strength and toughness have improved the uniformity of the microstructure and performance at different positions of the thickness of the steel plate, obtained high low-temperature impact toughness, and greatly improved the performance pass rate of extra-thick plate products. Breakthroughs in capacity and mass production capabilities have created conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A low-alloy extra-thick steel plate with excellent low-temperature toughness and a manufacturing method thereof, comprising the following steps:

[0025] Raw material slab preparation: low alloy steel continuous casting slab thickness 300mm, casting slab melting composition C: 0.16%, Si: 0.25%, Mn: 1.46%, P: 0.012%, S: 0.003%, N: 35ppm, H: 1.3 ppm; Nb+V: 0.085%; Ti: 0.018%;

[0026] Billet cutting, milling and cleaning: It is strictly forbidden to use a magnetic crane during the re-transportation process of the continuous casting billet that has been stacked and cooled for more than 48 hours. Use a special gantry milling machine to perform interface cutting and milling on the billet according to the size requirements of the composite stacked rolling, so as to remove the original casting billet interface. The oxide layer on the surface of the place, and ensure that it is clean and free of oil. The processed billets are combined with double billets or multiple billets to ...

Embodiment 2

[0034] A low-alloy extra-thick steel plate with excellent low-temperature toughness and a manufacturing method thereof, comprising the following steps:

[0035] Raw material slab preparation: low alloy steel continuous casting slab thickness 300mm, casting slab melting composition C: 0.18%, Si: 0.35%, Mn: 1.38%, P: 0.010%, S: 0.002%, N: 40ppm, H: 1.4 ppm; Nb+V: 0.010%;

[0036] Billet cutting, milling and cleaning: It is strictly forbidden to use a magnetic crane during the re-transportation process of the continuous casting billet that has been stacked and cooled for more than 48 hours. Use a special gantry milling machine to perform interface cutting and milling on the billet according to the size requirements of the composite stacked rolling, so as to remove the original casting billet interface. The oxide layer on the surface of the place, and ensure that it is clean and free of oil. The processed billets are combined with double billets or multiple billets to ensure that ...

Embodiment 3

[0044] A low-alloy extra-thick steel plate with excellent low-temperature toughness and a manufacturing method thereof, comprising the following steps:

[0045] Raw material slab preparation: Low alloy steel continuous casting slab thickness 300mm, casting slab melting composition C: 0.16%, Si: 0.30%, Mn: 1.33%, P: 0.009%, S: 0.003%, N: 45ppm, H: 1.2 ppm; Nb+V: 0.09%;

[0046] Billet cutting, milling and cleaning: It is strictly forbidden to use a magnetic crane during the re-transportation process of the continuous casting billet that has been stacked and cooled for more than 48 hours. Use a special gantry milling machine to perform interface cutting and milling on the billet according to the size requirements of the composite stacked rolling, so as to remove the original casting billet interface. The oxide layer on the surface of the place, and ensure that it is clean and free of oil. The processed billets are combined with double billets or multiple billets to ensure that t...

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Abstract

The invention relates to a manufacturing method for low-alloy super-thick steel plates with excellent low-temperature toughness. The method comprises the steps of raw material blank preparation, blankcutting, milling and cleaning, vacuum girth welding compounding, blank heating and rolling, super-thick steel plate heat treatment and the like. The thickness of one obtained extra-thick steel plateranges from 100 millimeters to 260 millimeters, the obtained super-thick steel plate has the yield strength ReH of 325MPa or above, the tensile strength Rm of 450MPa or above, the elongation of 21% orabove, the minus 20 DEG C side knock absorbed energy KV2 of 120J or above, the minus 40 DEG C side knock absorbed energy of 100J or above, and the minus 60 DEG C side knock absorbed energy of 60J orabove. The manufacturing method for the low-alloy super-thick steel plates with excellent low-temperature toughness has the advantages of being stable in raw material source, flexible in production organization, high in efficiency, high in yield, low in energy consumption, environmentally friendly and the like, and compared with a continuous casting billet direct rolling super-thick plate process,the investment cost of an expensive large-section continuous casting machine can be saved.

Description

technical field [0001] The invention belongs to the technical field of steel plate processing, and in particular relates to a method for manufacturing low-alloy extra-thick steel plates with excellent low-temperature toughness. Background technique [0002] Extra-thick steel plates are usually produced by large steel ingots or large-section continuous casting slabs. The low-alloy extra-thick steel plates of the present invention are made of ordinary thickness continuous casting slabs for vacuum compounding and rolling to prepare extra-thick plates, that is, two Or several continuous casting slabs are combined into a large slab by vacuum electron beam welding, and then rolled and combined to obtain extra-thick steel plate products with high compression ratio. This technology belongs to the category of continuous casting slab vacuum composite additive manufacturing technology. Specifically, it refers to the combination of high-power vacuum electron beam welding technology (EBW...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C21D8/02C21D1/18C21D1/28B23P15/00B23K15/06
CPCB23K15/06B23P15/00C21D1/18C21D1/28C21D8/0226C22C38/02C22C38/04C22C38/12
Inventor 成小龙刘熙章孙京波史成斌杨建勋胡晓英李灿明郝燕森程文华谢京全
Owner SD STEEL RIZHAO CO LTD
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