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Steel plate for ship structure and manufacture method thereof

A steel plate and hull technology, which is applied in the steel plate of the hull structure and its manufacturing field, can solve the problems of shrinkage rate not meeting user requirements, deterioration of steel plate welding performance, aggravated segregation of core components, etc., to achieve reasonable chemical composition design and high production efficiency , easy-to-manipulate effects

Inactive Publication Date: 2011-10-12
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the general production method of controlled rolling and controlled cooling is difficult to meet the requirements for the performance of steel plates in the thickness direction, especially for 100mm extra-thick steel plates.
Specifically, the core structure of the steel plate is often deteriorated due to composition segregation, and the reduction of area in the thickness direction cannot meet the user's requirements. The normalized steel also increases the carbon content or alloy content due to the decrease in strength, which not only increases the cost, but also increases the cost of the steel plate. The welding performance will also deteriorate, and it will also aggravate the composition segregation of the core

Method used

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  • Steel plate for ship structure and manufacture method thereof
  • Steel plate for ship structure and manufacture method thereof
  • Steel plate for ship structure and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: 100mm thick EH36 industrial rolling

[0049] A high-strength, high-toughness, high-area reduction extra-thick ship plate steel, its chemical composition mass percentage content is: C 0.12%, Si 0.36%, Mn 1.45%, P 0.009%, S 0.005%, Nb 0.038%, V 0.033 %, Ti 0.017%, Ni 0.25%, Als 0.038%, and the balance of Fe and unavoidable impurities.

[0050] Billet section size: 300mm×2200mm×3600mm; finished product size: 100mm×2300mm×Lmm.

[0051] The preparation method of the above-mentioned steel plate used for the hull structure is as follows: including smelting, heating, rough rolling, and finish rolling processes, wherein the basicity of the refining slag is controlled at 2.5, the long nozzle for ladle casting is protected by Ar seal, and the submerged nozzle of the tundish is added with Ar. Sealed full protection pouring, the tundish superheat is 19 ℃. The subsequent rolling, water cooling and heat treatment processes are shown in Table 1. The steel properties of ...

Embodiment 2

[0053] Example 2: 80mm thick EH36 industrial rolling

[0054] A controlled-rolled extra-thick high-strength ship plate steel, the mass percent of its chemical composition is: C 0.13%, Si 0.36%, Mn 1.45%, P 0.009%, S 0.004%, Nb 0.038%, V 0.033%, Ti 0.017%, Ni 0.31%, Als 0.038%, the balance is Fe and unavoidable impurities.

[0055] Billet section size: 300mm×2200mm×3600mm; finished product size: 80mm×2500mm×Lmm.

[0056] The preparation method of the above-mentioned control-rolled extra-thick high-strength ship plate steel is as follows: including smelting, heating, rough rolling, and finish rolling processes; wherein the basicity of the refining slag is controlled at 2.8, the long nozzle for ladle pouring is protected by an Ar seal, and the tundish is immersed The full-protection pouring with double-type nozzle and Ar seal, the superheat of the tundish is 23°C; the subsequent rolling, water cooling and heat treatment processes are shown in Table 1. The steel properties of ...

Embodiment 3

[0057] Example 3: 60mm thick EH36 industrial rolling

[0058] A controlled-rolling type extra-thick high-strength ship plate steel, the mass percentage of its chemical composition is: C 0.15%, Si 0.32%, Mn 1.43%, P 0.010%, S 0.003%, Nb 0.033%, V 0.031%, Ti 0.015%, Ni 0.29%, Als 0.037%, the balance is Fe and unavoidable impurities.

[0059] Billet section size: 300mm×2200mm×3600mm; finished product size: 60mm×2800mm×Lmm.

[0060] The preparation method of the above-mentioned control-rolled extra-thick high-strength ship plate steel is as follows: including smelting, heating, rough rolling, and finish rolling processes; wherein the basicity of the refining slag is controlled at 3.7, the long nozzle for ladle pouring is protected by an Ar seal, and the tundish is immersed Full protection pouring with type nozzle and Ar seal, the superheat of the tundish is 21°C. The subsequent rolling, water cooling and heat treatment processes are shown in Table 1. The properties of the ste...

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Abstract

The invention discloses a steel plate for a ship structure and a manufacture method thereof. The steel plate for the ship structure comprises the following chemical components in percentage by weight: 0.10%-0.16% of C, 0.20%-0.45% of Si, 1.25%-1.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020%-0.050% of Nb, 0.010%-0.020% of Ti, 0.030%-0.070% of V, 0.20%-0.40% of Ni, 0.015%-0.050% of Als, and the balance of Fe and unavoidable impurities, wherein Als is aluminum soluble in acid. According to the invention, the steel plate can be used for ships or offshore oil platforms; the steel plate is simple in component design and good and steady in performance and also has a good welding performance; and simultaneously, a preparation process is simple and is easy to operate.

Description

technical field [0001] The present invention relates to low-alloy structural steel, in particular to a steel plate for ship hull structure and its manufacturing method. Background technique [0002] The steel plate for hull structure is one of the most widely used steel plates in shipbuilding and offshore oil platform industry. With the development of the global economy, the gradual deepening of the integration process, the rapid development of the world shipping industry and marine energy mining industry, the demand for large-tonnage ships and offshore oil platforms is increasing year by year. There is an increasing demand for high-grade steels for hull structures with special properties such as resistance to lamellar tearing. Ship plate steel has the characteristics of high quality requirements and strict inspection, and is one of the high value-added steel products. [0003] However, the general production method of controlled rolling and controlled cooling is difficult...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 周平任继银王腾飞孙其家刘军刚贾大海秦港
Owner LAIWU IRON & STEEL GRP
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