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Thin-gauge high-toughness steel plate and manufacturing process thereof

A manufacturing process and high toughness technology, applied in the field of metallurgy, can solve the problems of complex heat treatment production process and high alloy joining cost, and achieve the effect of reducing joining cost and heat treatment cost, and high application value.

Pending Publication Date: 2022-02-11
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of high alloy addition cost and complex heat treatment production process of the existing thin-gauge high-toughness steel plate, the invention provides a thin-gauge high-toughness steel plate and its manufacturing process. The alloy addition cost and heat treatment cost of the invention are low, and the obtained Yield strength ReH≥355MPa, tensile strength Rm≥470MPa, elongation≥22% of thin-gauge high-toughness steel plate, -40°C longitudinal impact toughness KV2≥120J

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A thin-gauge high-toughness steel plate with a thickness of 6 mm is produced by the following manufacturing process:

[0028] (1) In terms of weight percentage, the blank composition is C: 0.11%, Mn: 1.45%, Si: 0.20%, P: 0.015%, S: 0.003%, Alt: 0.027%, Nb: 0.026%, N: 40ppm, H: 1.2ppm, the balance is Fe, the billet has been subjected to RH vacuum refining treatment, and the billet size is 2100mm in length*1900mm in width*100mm in thickness;

[0029] (2) Carry out milling and cleaning of the billet, and it is strictly forbidden to use a magnetic crane during the preparation for reversing. After the surface is cleaned, the billet before assembly is required to ensure that the surface of the continuous casting billet is smooth, clean, dry, free of oil and dust, and the gap between the cast billet after assembly is not greater than 0.4mm;

[0030] (3) The release agent is sprayed on the surface of the billet to be assembled, and the four sides of the billet surface to be as...

Embodiment 2

[0036] A thin-gauge high-toughness steel plate with a thickness of 5 mm is produced by the following manufacturing process:

[0037] (1) In terms of weight percentage, the blank composition is C: 0.10%, Mn: 1.50%, Si: 0.23%, P: 0.012%, S: 0.002%, Alt: 0.033%, Nb: 0.030%, N: 35ppm, H: 1.0ppm, the balance is Fe, the billet has been subjected to RH vacuum refining treatment, and the billet size is 2300mm in length*2100mm in width*80mm in thickness;

[0038] (2) Carry out milling and cleaning of the billet, and it is strictly forbidden to use a magnetic crane during the preparation for reversing. After the surface is cleaned, the billet before assembly is required to ensure that the surface of the continuous casting billet is smooth, clean, dry, free of oil and dust, and the gap between the cast billet after assembly is not greater than 0.4mm;

[0039] (3) The release agent is sprayed on the surface of the billet to be assembled, and the four sides of the billet surface to be ass...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a thin-gauge high-toughness steel plate and a manufacturing process thereof. The thin-gauge high-toughness steel plate is manufactured according to the following manufacturing process: (1) preparing blanks; (2) milling and cleaning the surfaces of the blanks; (3) spraying an isolating agent on to-be-assembled surfaces of the blanks and drying the to-be-assembled surfaces of the blanks; (4) making the blanks aligned and assembled, and carrying out peripheral girth welding on interface gaps of the adjacent blanks to obtain a composite blank; (5) heating the composite blank, discharging and rolling the composite blank after diathermy, controlling the thickness of an intermediate blank according to 30-50mm, and flattening and air-cooling after rolling to obtain a composite steel plate; and (6) shearing the head, tail and two sides of the composite steel plate and separating the steel plate. The alloy adding cost and the heat treatment cost are low, the yield strength ReH of the prepared thin-gauge high-toughness steel plate is larger than or equal to 355 MPa, the tensile strength Rm is larger than or equal to 470 MPa, the elongation is larger than or equal to 22%, and the longitudinal impact toughness KV2 at the temperature of -40 DEG C is larger than or equal to 120 J.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a thin-gauge high-toughness steel plate and a manufacturing process thereof. Background technique [0002] Thin steel plates are usually rolled directly from thin continuous casting slabs by four-high rolling mills or re-rolled from thick slabs as billets. However, for thin-gauge high-toughness structural steel plates of 4 to 6 mm, it is difficult to ensure that the rolling is completed within the expected temperature range due to the extremely thin steel plate and the rapid cooling rate during the rolling process. Thin-gauge steel plates produced by furnace coil rolling also need to be rolled with long thin-gauge cast slabs. During the rolling process, the length of semi-finished steel plates is very long, and the temperature difference between the head and the tail is very large. In order to ensure that the temperature in the entire length range meets the rolling requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C22C38/02C22C38/04C22C38/06C22C38/12
CPCB23P15/00C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 刘熙章成小龙孙京波郝燕森史成斌胡淑娥侯东华李灿明杨建勋胡晓英王建王润港
Owner SD STEEL RIZHAO CO LTD
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