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Low carbon TMCP technology EH36 boat deck and production method thereof

A technology of EH36 and ship plate, which is applied in the field of alloy steel production, can solve the problems of large amount of precious alloy added, long production cycle and high production cost, and achieve significant economic and social benefits, low consumption and low cost.

Inactive Publication Date: 2018-07-27
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although relatively stable product performance can be obtained through post-rolling heat treatment and normalizing process, the production cycle is long, the addition of Ni and other precious alloys is large, and the production cost is high, making it difficult to adapt to the current severe market competition situation.

Method used

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  • Low carbon TMCP technology EH36 boat deck and production method thereof
  • Low carbon TMCP technology EH36 boat deck and production method thereof
  • Low carbon TMCP technology EH36 boat deck and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-carbon TMCP process EH36 ship board, the composition of the chemical composition mass percentage of the ship board is as follows: C: 0.08%, Si: 0.30%, Mn: 1.5%, P: 0.017%, S: 0.005%, Nb: 0.040%, V: 0.040%, Ti: 0.013%, Als: 0.035%, and the balance is Fe and inevitable impurities.

[0023] The manufacturing method of the above-mentioned low-carbon TMCP process EH36 ship plate, the process route is: KR molten iron pretreatment→converter smelting→deoxidation alloying→LF refining→VD / RH refining→continuous casting→cast slab off-line slow cooling→cast slab heating→ High pressure water descaling → rough rolling → finishing rolling → ACC cooling → straightening → finishing → inspection and storage.

[0024] Specifically, the starting rolling temperature in the rough rolling stage is controlled at about 1000 °C, the starting rolling temperature in the finishing rolling stage is controlled below 900 °C, the final rolling temperature is 800-830 °C, the final cooling temperatu...

Embodiment 2

[0027] like Figure 1 to Figure 3 A low-carbon TMCP process EH36 ship board is shown, and the composition of the ship board in terms of mass percentage of chemical components is as follows: C: 0.06%, Si: 0.20%, Mn: 1.40%, P: 0.018%, S: 0.005%, Nb: 0.030%, V: 0.030%, Ti: 0.008%, Als: 0.015%, and the balance is Fe and inevitable impurities.

[0028] The manufacturing method of the above-mentioned low-carbon TMCP process EH36 ship plate, the process route is: KR molten iron pretreatment→converter smelting→deoxidation alloying→LF refining→VD / RH refining→continuous casting→cast slab off-line slow cooling→cast slab heating→ High pressure water descaling → rough rolling → finishing rolling → ACC cooling → straightening → finishing → inspection and storage.

[0029] Specifically, the starting rolling temperature in the rough rolling stage is controlled at about 1000 °C, the starting rolling temperature in the finishing rolling stage is controlled below 900 °C, the final rolling tempe...

Embodiment 3

[0031] A low-carbon TMCP process EH36 ship board, the composition of the chemical composition mass percentage of the ship board is as follows: C: 0.06-0.09%, Si: 0.35%, Mn: 1.55%, P: 0.017%, S: 0.005%, Nb: 0.045 %, V: 0.045%, Ti: 0.020%, Als: 0.050%, and the balance is Fe and inevitable impurities.

[0032] The manufacturing method of the above-mentioned low-carbon TMCP process EH36 ship plate, the process route is: KR molten iron pretreatment→converter smelting→deoxidation alloying→LF refining→VD / RH refining→continuous casting→cast slab off-line slow cooling→cast slab heating→ High pressure water descaling → rough rolling → finishing rolling → ACC cooling → straightening → finishing → inspection and storage.

[0033] Specifically, the starting rolling temperature in the rough rolling stage is controlled at about 1000 °C, the starting rolling temperature in the finishing rolling stage is controlled below 900 °C, the final rolling temperature is 800-830 °C, the final cooling te...

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Abstract

The invention relates to a low carbon TMCP technology EH36 boat deck and a production method thereof. The boat deck comprises chemical compositions of, by mass, 0.06-0.09% of C, 0.20-0.35% of Si, 1.40-1.55% of Mn, no larger than 0.018% of P, no larger than 0.005% of S, 0.030-0.045% of Nb, 0.030-0.045% of V, 0.008-0.020% of Ti, 0.015-0.050% of Als, and the balance Fe and unavoidable impurities. Theproduction method comprises the following steps of KR molten iron pretreatment, converter smelting, deoxidation alloying, LF refining, VD / RH refining, continuous casting, casting blank off-line slowcooling, casting blank heating, high-pressure water descaling, rough rolling, finish rolling, ACC cooling, straightening, finishing, and testing and warehousing. According to the low carbon TMCP technology EH36 boat deck and the production method thereof, compositions and processes are optimized, a low carbon component design is adopted, a TMCP technology is used for producing and delivery, the addition of Ni precious metal is canceled, normalization heating processing technology is canceled at the same time, production cost is reduced, and manufacturing cycle is shortened; the production cycle of steel plates in rolling process is shortened from 4-5 days to 2-3 days, low cost, low consumption and short process production of the EH36 boat deck is realized indeed, and significant economic and social benefits are achieved.

Description

technical field [0001] The invention relates to the field of alloy steel production, in particular to a low-carbon TMCP process EH36 ship plate and a short-flow production method thereof. Background technique [0002] EH36 low-temperature high-toughness hull structural steel plate is a kind of hull structural steel with excellent low-temperature impact toughness and welding performance. key parts of the hull such as plates. Traditionally, EH36 ship plate is generally designed with medium carbon composition, and the carbon content (C%) is generally 0.14-0.19%. It is produced by controlled rolling + normalizing heat treatment process and delivered in heat treatment state. Although relatively stable product performance can be obtained through the post-rolling heat treatment and normalizing process, the production cycle is long, the addition of Ni and other precious alloys is large, and the production cost is high, making it difficult to adapt to the current severe market compe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/14C22C38/02C22C38/04C22C38/06C22C33/04B21C37/02
CPCC22C38/12B21C37/02C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 王杰吴晓光刘德红张子义李复磊张明国焦广亮王涛李宝伟郭亚南孙乾双
Owner SD STEEL RIZHAO CO LTD
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