High-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and manufacturing method thereof

A high-strength, toughness technology, applied in the field of steel materials, can solve the problems of plasticity and toughness decline, high yield ratio, limited capacity, etc., and achieve the effect of uniform thickness structure

Active Publication Date: 2015-09-30
NORTHEASTERN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In addition, with the urgent demand for light weight and safety of large-scale engineering structures, more and more stringent requirements are put forward for the strength, plasticity, toughness and yield ratio of steel materials, but increasing strength and improving plasticity and toughness have Certain contradictions, the increase of strength often leads to the decrease of plasticity and toughness, and the traditional high-strength medium-thick plate faces the problem of high yield ratio
Although grain refinement and microstructure homogenization can be used to improve low temperature toughness, the grain refinement and microstructure homogenization of thick gauge steel plates are limited, making this toughening method limited in its ability to improve low temperature toughness of thick gauge steel plates
However, there is no report on the development of medium-thick plates with uniform thickness structure through low-carbon Mn alloying.

Method used

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  • High-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and manufacturing method thereof
  • High-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and manufacturing method thereof
  • High-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition of the high-strength, tough and plastic low-carbon medium-manganese medium-thick plate with a thickness of 40mm is: C: 0.032%, Si: 0.36%, Mn: 5.8%, P: 0.002%, S: 0.003 %, Ni: 1.48%, the balance is Fe and unavoidable impurities; its microstructure is tempered martensite and fine ferrite + metastable austenite structure, and the structure of the surface of the steel plate is the same as that of the core ; Its yield strength is 700MPa, tensile strength is 820MPa, elongation after fracture is 28%, and the impact absorption energy of -60 ℃ Charpy V-notch standard sample is 200J, and the impact absorption energy of -80 ℃ Charpy V-notch standard sample The impact absorption energy is 160J, and the yield ratio is 0.85.

[0034] The preparation method of above-mentioned plate is carried out according to the following steps:

[0035] Heat a 70mm thick billet to 1200°C and keep it warm for 3 hours. The chemical composition is as follows: C: 0.032%, Si: 0....

Embodiment 2

[0041] The chemical composition of high-strength, toughness and plastic low-carbon medium-manganese plate with a thickness of 20mm is: C: 0.039%, Si: 0.29%, Mn: 3.9%, P: 0.004%, S: 0.002 %, Ni: 0.98%, the balance is Fe and unavoidable impurities; its microstructure is tempered martensite and fine ferrite + metastable austenite structure, and the structure of the surface of the steel plate is the same as that of the core ; Its yield strength is 570MPa, tensile strength is 665MPa, elongation after fracture is 29%, the impact absorption energy of -60 ℃ Charpy V-notch standard sample is 245J, -80 ℃ Charpy V-notch standard sample The impact absorption energy is 225J, and the yield ratio is 0.86.

[0042] The manufacturing method of above-mentioned plate is carried out according to the following steps:

[0043] Heat a steel billet with a thickness of 70mm to 1200°C and hold it for 2.5 hours. The chemical composition of the billet is: C: 0.039%, Si: 0.29%, Mn: 3.9%, P: 0.004%, S: 0.00...

Embodiment 3

[0049] High-strength, tough and plastic low-carbon medium-manganese medium-thick plate with a thickness of 10mm, its chemical composition is: C: 0.05%, Si: 0.2%, Mn: 3.0%, P: 0.005%, S: 0.001 %, Ni: 0.5%, the balance is Fe and unavoidable impurities; its microstructure is tempered martensite and fine ferrite + metastable austenite structure, and the structure of the surface of the steel plate is the same as that of the core ; Its yield strength is 520MPa, tensile strength is 620MPa, elongation after fracture is 32%, the impact absorption energy of -60 ℃ Charpy V-notch standard sample is 210J, -80 ℃ Charpy V-notch standard sample The impact absorption energy is 195J, and the yield ratio is 0.84.

[0050] The preparation method of above-mentioned plate is carried out according to the following steps:

[0051] Heat a 70mm thick billet to 1200°C and hold it for 2 hours. The chemical composition of the billet is as follows: C: 0.05%, Si: 0.2%, Mn: 3.0%, P: 0.005%, S: 0.001%, Ni: 0...

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Abstract

The invention aims to provide a high-strength high-toughness and high-plasticity low-carbon medium-manganese medium-thickness plate and a manufacturing method thereof, and belongs to the technical field of steel materials. The medium-thickness plate is developed in a low-carbon Mn alloying mode and is high in strength, toughness and plasticity and uniform in thickness-direction structure. The medium-thickness plate comprises, by weight, 0.03-0.05% of C, 0.20-0.40% of Si, 3.00-6.00% of Mn, 0.005% of P or less, 0.003% of S or less, 0.5-1.50% of Ni and the balance of Fe and inevitable impurities, and the thickness of the medium-thickness plate ranges from 10 mm to 40 mm. The manufacturing method includes the steps that 1, a steel blank is heated to 1200 DEG C, heat is preserved for 2 h-3 h for sufficient austenitization, then one-stage or two-stage rolling is performed on the steel blank, and the plate is water-cooled to the indoor temperature after rolling; 2, the plate is placed in a heating furnace with the temperature of 610 DEG C-640 DEG C, heat is preserved for 2 h-3 h, and then the plate is quenched to the indoor temperature. The medium-thickness plate has the advantages of being uniform in thickness-direction structure, low in yield-strength ratio and high in strength, plasticity and toughness and has better structure performance than a traditional high-strength medium-thickness plate. The manufacturing method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, in particular to a low-carbon medium-manganese medium-thick plate with high strength, toughness and plasticity and a preparation method thereof. Background technique [0002] Traditional high-strength medium and heavy plate products generally adopt low carbon (0.06-0.2mass%) and low manganese (1.0-1.8mass%), and add precious metal elements such as Cr and Mo at the same time. Or heat treatment process production. And as the thickness of the steel plate increases, it is necessary to add a large amount of alloying elements such as Cr and Mo to improve hardenability, which greatly increases the production cost. At the same time, it is supplemented by an increase in the C content, which seriously deteriorates the weldability and low temperature toughness. Moreover, my country is a country with little Mo and no Cr resources, and the application of a large amount of precious metal elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C21D8/02C21D1/18
Inventor 陈俊吕梦阳唐帅刘振宇王国栋
Owner NORTHEASTERN UNIV
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