High-ductility FH500-grade ship plate steel and preparation method thereof

A ship plate steel, ductility technology, applied in the field of metallurgy, can solve the problems of low steel plate surface elongation, poor steel plate surface quality, complex production process, etc., to achieve the effects of reducing MnS inclusions, low production costs, and improving tissue uniformity

Active Publication Date: 2018-09-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The patent with the publication number CN106756612A discloses a bainite / martensite / austenite high-toughness and easy-to-weld ship plate steel and its manufacturing method. The invention has complex production process, long production cycle, low production efficiency, and contains precious elements Ni, Mo, Cr, higher production cost
[0006] The patent with the publication number CN104911503B discloses a ship plate steel with high strength and high toughness which is easy to weld and its production method. The Si content in the composition is high, and red oxide scales are easily formed on the surface of the steel plate, and the surface quality of the steel plate is poor; Cr, Mo, The content of Ni element is high, the production cost is high; the finish rolling temperature is low, and the load of the rolling mill is large;

Method used

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  • High-ductility FH500-grade ship plate steel and preparation method thereof
  • High-ductility FH500-grade ship plate steel and preparation method thereof
  • High-ductility FH500-grade ship plate steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of high ductility FH500 ship plate steel with a thickness of 19mm, specifically comprising the following process steps:

[0031] step 1:

[0032] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 120 mm. The billet was heated to 1210 °C and kept for 1.5 hours. The chemical composition and weight percentage of the billet are shown in Table 1;

[0033] Step 2:

[0034] (1) Rough rolling is carried out on the heated billet for 3 passes, the starting rolling temperature is 1060°C, the rolling thickness is 120mm → 84mm → 59mm → 42mm, the total cumulative reduction rate is 65%, and the intermediate rolling thickness is 42mm. Blank;

[0035] (2) Perform 3 passes of finish rolling on the intermediate slab, the starting rolling temperature is 960°C, the rolling thickness is 42mm→32mm→24mm→19mm, the total cumulative reduction rate is 54.8%, and the finishing rolling temperature is 900°C. Steel plat...

Embodiment 2

[0040] A kind of preparation method of high ductility FH500 grade ship plate steel with a thickness of 30mm, specifically comprises the following process steps:

[0041] step 1:

[0042] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 140 mm. The billet was heated to 1236 °C and kept for 1 hour. The chemical composition and weight percentage of the billet are shown in Table 1;

[0043] Step 2:

[0044] (1) Carry out 3 passes of rough rolling on the heated billet, the starting rolling temperature is 1150°C, the rolling thickness is 140mm→102mm→76mm→58mm, the total cumulative reduction rate is 58.6%, and the intermediate billet with a thickness of 58mm is obtained ;

[0045] (2) Perform 3 passes of finish rolling on the intermediate slab, the starting rolling temperature is 950°C, the rolling thickness is 58mm→46mm→37mm→30mm, the total cumulative reduction rate is 48.3%, and the finishing rolling temperature is 890°C...

Embodiment 3

[0050] A kind of preparation method that is the high ductility FH500 ship plate steel of 25mm in thickness, specifically comprises the following process steps:

[0051] step 1:

[0052] According to the composition design, the molten steel was smelted and cast into a billet with a thickness of 130 mm. The billet was heated to 1230 °C and kept for 1 hour. The chemical composition and weight percentage of the billet are shown in Table 1;

[0053] Step 2:

[0054] (1) Rough rolling is carried out on the heated billet for 3 passes, the starting rolling temperature is 1143°C, the rolling thickness is 130mm → 91mm → 67mm → 52mm, the total cumulative reduction rate is 60%, and the intermediate rolling thickness of 52mm is obtained. Blank;

[0055] (2) Perform 3 passes of finish rolling on the intermediate slab, the starting rolling temperature is 940°C, the rolling thickness is 52mm→40mm→31mm→25mm, the total cumulative reduction rate is 51.9%, and the finishing rolling temperature ...

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Abstract

The invention provides high-ductility FH500-grade ship plate steel and a preparation method thereof, and belongs to the technical field of metallurgy. The components of the ship plate steel are as follows in percentage by weight: 0.04-0.08% of C, 0.04-0.16% of Si, 1.20-1.40% of Mn, 0.03-0.04% of Nb, 0.01-0.02% of Ti, 0.02-0.04% of Als, less than or equal to 0.02% of P, less than or equal to 0.01%of S and the balance of Fe and inevitable impurities; the preparation method of the FH500-grade ship plate steel comprises the steps that billet steel with the thickness of 120-140 mm is adopted for being subjected to heating, thermal insulation, rough rolling, finish rolling and cooling to obtain the finished-product ship plate steel. According to the high-ductility FH500-grade ship plate steel and the preparation method thereof, by adopting a controlled rolling and controlled cooling technology, the ship plate steel with the texture including soft-phase ferrite and hard-phase bainite is obtained; moreover, elements such as Cr, Ni and Mo are not added, so that the cost is low; through a fast cooling method, the finishing temperature can be properly improved, the rolling mill load can be reduced, the rolling efficiency can be improved, and production, which is low in cost, easy to conduct rolling and high in efficiency, of the high-ductility FH500-grade ship plate steel is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high ductility FH500 grade ship plate steel and a preparation method thereof. Background technique [0002] In recent decades, with the continuous increase of maritime trade, the demand for ship plate steel is also increasing, and people's requirements for the performance of ship plate steel are also more stringent. As a major shipbuilding country, my country should focus on the oil and gas leakage caused by rocks and collisions during the production of liquefied petroleum gas and liquefied natural gas and crude oil tankers, so as to avoid environmental pollution and ensure the safety of life and property. However, the general-strength ship plate steel can no longer meet the requirements of the hull structure, and it is imperative to study high-strength or even ultra-high-strength ship plate steel. FH500 grade ship plates are widely used in the fields of ships a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C22C33/04
CPCC21D8/0205C21D8/0221C21D8/0263C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 刘振宇周晓光孙晓青王国栋
Owner NORTHEASTERN UNIV
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