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Super-thick high-level boat plate steel and production process thereof

A production process and high-level technology, applied in the direction of process efficiency improvement, manufacturing converters, temperature control, etc., to achieve stable product performance, small quality fluctuations, and high product strength

Inactive Publication Date: 2010-02-10
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the shortcomings of the above prior art, propose a method that can eliminate some defects such as uneven internal and external structures and obvious performance fluctuations generated in the rolling process of extra-thick plates, improve product quality, and improve product quality. Competitive extra-thick high-grade ship plate steel and its production process

Method used

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  • Super-thick high-level boat plate steel and production process thereof
  • Super-thick high-level boat plate steel and production process thereof
  • Super-thick high-level boat plate steel and production process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The chemical composition (mass percentage) of the E grade extra thick ship plate steel of the present embodiment is: C0.115%, Mn 1.14%, P0.007%, S0.0015%, Si 0.31%, Ni 0.18%, Cr0.06 %, Cu0.04%, Alt0.034%, Nb 0.025%, and the rest is Fe content. Cut a test block with a size of 200mmX100mmX60mm from a 60mm thick steel plate, and normalize a part of the test block at 880°C, 910°C and 940°C for 60 minutes; 100min, 120min normalizing treatment.

[0030] After normalizing, two impact samples and two tensile samples were wire-cut from 1 / 4 of the thickness direction of each test block, and then wire-cut from 1 / 2 (core) of each test block thickness direction. 2 impact specimens. The metallographic sample was taken out by wire cutting from the same part of the sample after impact. Grinding, polishing and corrosion of metallographic samples. The etchant was 4% nital, and the microstructure was observed with an optical microscope. figure 1 It is the original organizational char...

Embodiment 2

[0041] The chemical composition (mass percentage) of the E36 grade extra-thick ship plate steel in this example is: C0.113%, Mn 1.48%, P0.008%, S0.0019%, Si 0.31%, Ni 0.23%, Cr0.07% , Cu0.23%, Alt0.038%, Nb 0.028%, V0.044%, and the rest is Fe content. Cut a test block with a size of 200mmX100mmX60mm from a 60mm thick steel plate, and normalize a part of the test block at 880°C, 910°C and 940°C for 60 minutes; 100min, 120min normalizing treatment. Grinding, polishing and corrosion of metallographic samples. The etchant was 4% nital, and the microstructure was observed with an optical microscope. The tensile test was carried out on a CMT5305 precision microcomputer-controlled universal testing machine, and the yield strength, tensile strength and elongation of the sample were measured. The impact toughness of the material was tested by a pendulum impact testing machine. Figure 13 It is the original organizational chart of E36 extra thick and high ship plate steel. Figure ...

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Abstract

The invention relates to super-thick steel and a heating process thereof, in particular to super-thick high-level boat plate steel and a normalizing process thereof. The super-thick steel comprises the following components by weight percent: 0.06% to 0.18% of C, 1.00% to 1.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.35% of Si, 0.03% to 0.30% of Ni, 0.03% to 0.20% of Cr, 0.02% to 0.25% of Cu, 0.020% to 0.050% of Alt, 0.010% to 0.040% of Nb, 0.003% to 0.060% of V and the balance of Fe. The normalizing temperature ranges from 880 DEG C to 940 DEG C; the temperature keeping time ranges from 0.8H minutes to 1.5H minutes, wherein H is the thickness of a steel plate; and the cooling speed is from 1 DEG C / S to 5 DEG C / S. The defects of nonuniform internal and external structures, obvious performance fluctuation, and the like in the rolling process of the super-thick plate are eliminated by normalization, thereby the productquality is improved, the product competitiveness is enhanced and the defects of the structure of the super-thick high-level boat plate steel are eliminated.

Description

technical field [0001] The invention relates to an extra-thick steel and its heating process, in particular to an extra-thick high-grade ship plate steel and its production process. Background technique [0002] In recent years, due to the rapid growth of world seaborne trade volume, the shipbuilding industry has experienced unprecedented prosperity. Ships are gradually developing in the direction of large-scale and light weight, and the general-strength ship plate steel can no longer meet the requirements of the hull structure. With the rapid development of my country's shipbuilding industry, higher and higher requirements are put forward for the output, performance and quality of ship plate steel, and the application proportion of extra-thick and high-grade ship plate in the shipbuilding industry continues to increase. [0003] High-grade ship plate steel is used in a large amount and covers a wide range. It not only requires the steel plate to have high strength and plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/48C21D1/28C21D8/02C21C1/02C21C5/28C21C7/10C21C7/076B21B37/74
CPCY02P10/20
Inventor 朱爱玲尹雨群张恒华曾犇胡诗超朱松鹤
Owner NANJING IRON & STEEL CO LTD
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