Low-compression-ratio ultrathick EH36 ship plate steel and preparation method thereof

An EH36, bit-reduced technology, applied in the field of iron and steel metallurgy, can solve the problems of adverse effects on the stability of extra-thick plates, high strength and high impact toughness, and wide final cooling temperature range, so as to shorten the product delivery cycle, improve impact toughness, The effect of a large final cooling temperature range

Active Publication Date: 2016-07-27
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, NAC also has a wide range of final cooling temperature with changes in weather and width of steel plate thickness, which also has an adverse effect on the final stability of extra-thick plates
[0007] To sum up, the existing technology still cannot fully achieve the uniformity of the microstructure in the thickness direction when the continuous casting slab is used to produce the ultra-thick EH36 ship plate steel with a low compression ratio of 100-150 mm, so as to meet the requirements of high strength and high impact toughness

Method used

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  • Low-compression-ratio ultrathick EH36 ship plate steel and preparation method thereof
  • Low-compression-ratio ultrathick EH36 ship plate steel and preparation method thereof
  • Low-compression-ratio ultrathick EH36 ship plate steel and preparation method thereof

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Embodiment 1、2

[0027] A total of four slabs from two furnace numbers used for conventional production of EH36 were selected, and the composition met the requirements of the classification society and GB712EH36 steel grade. The thickness of the continuous casting slab is 370 mm, and the chemical composition is shown in Table 1. Rolled into finished steel plates with a thickness of 100-150mm, the temperature control of the rolling process is in accordance with the conventional production of normalized 60-100mm EH36 steel plate process, the rough rolling temperature is between 1050-1150 ℃, the finishing rolling start temperature is ≤880 ℃, and the pass is in accordance with Rolling load is controlled, and the rolling pass reduction rate distribution figure of embodiment 1 is as follows image 3 shown. Cool after rolling, and the cooling temperature is 600-660°C. Remarks: In this embodiment, laminar cooling or accelerated cooling may not be performed after rolling the steel plate. Rapid water ...

Embodiment 1

[0030]Embodiment 1 and embodiment 2 are extra-thick EH36 plates of 120 mm, and embodiments 3 and 4 are extra-thick EH36 plates of 150 mm. For the use of extra-thick plates, the performance uniformity in the thickness direction of the steel plate is the most concerned by users for extra-thick plates. 1 / 2 properties are tested for tensile, impact and metallographic examination. From the perspective of steel plate tensile properties, the transverse tensile properties of steel plate yield strength are between 355-400MPa, the tensile strength is between 550-560MPa, and the elongation is moderate. The tensile properties of the 1 / 2 thickness of the steel plate are slightly lower than that of the 1 / 4 thickness, but the difference is not significant. The low-temperature impact toughness of the steel plate is shown in Table 2, and the -40°C longitudinal impact toughness value at 1 / 4 thickness of the steel plate is ≥100J. The -40°C longitudinal impact toughness value at 1 / 2 thickness o...

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Abstract

The invention relates to low-compression-ratio ultrathick EH36 ship plate steel and a preparation method thereof; and a finished product structure of a steel plate is a tempered bainite structure. Chemical components of the steel plate adopt the classification society rule and the standard component system staged by GB 712; a continuous casting blank TMCP control rolling process is adopted; after rolling of the steel plate is offline, the steel plate is quickly cooled after normalizing, and is tempered to obtain the steel plate with the tempered bainite structure; the NAC temperature is 880-920 DEG C; the heating insulation time is 2.0-2.3 min / mm; the final cooling temperature of water cooling is 200-500 DEG C; the tempering temperature is 620-660 DEG C; and the tempering insulation time is 2.5-4.0 min / mm. The obtained ultrathick EH36 ship plate steel is higher in impact toughness, in particular, is higher in Akv value in 1 / 2 thickness place, is high in total strength, and is fine and uniform in microscope structure. The method is simple, and totally satisfies stable large-batch enterprise production.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an EH36 ship plate steel with a low compression ratio and a thickness of 100-150 mm and a production method thereof. Background technique [0002] Ship plate steel is an important steel material on which the development of the national economy depends. At present, the development trend of ship plate steel is as follows. development. [0003] At present, only the Det Norske Veritas (DNV) specification and GB712-2011 "Steel for Ships and Offshore Engineering" among the general classification societies of nine countries have regulations on 150mm thick ship plates, and the rest are only 100mm and below. Corresponding provisions have been made on the ship board. The composition range of GB712-2011 or EH36 steel grade in the specification is applicable to the steel plate thickness range of 0-150mm, and the composition span is too large. Even if the composition is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D1/28C21D1/18
CPCC21D1/18C21D8/02C21D8/0247C21D1/28C21D2211/002
Inventor 刘朝霞李经涛吴小林刘俊赵孚钱刚
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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