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Production method for 40 kg class ship plate for large heat input welding

A large input energy welding and production method technology, applied in the field of iron and steel metallurgy, can solve problems such as reducing construction efficiency

Inactive Publication Date: 2017-10-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional methods such as manual welding and submerged arc welding are used for welding, and the line energy is generally 30-60kJ / cm, and welding methods such as multi-layer welding, preheating, and backing plates greatly reduce construction efficiency.

Method used

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  • Production method for 40 kg class ship plate for large heat input welding
  • Production method for 40 kg class ship plate for large heat input welding
  • Production method for 40 kg class ship plate for large heat input welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. The chemical composition weight percentages are: C: 0.075%, Si: 0.30%, Mn: 1.48%, Nb: 0.030%, Ti: 0.013%, Ni: 0.26%, Cu: 0.23%, Als: 0.025%, P≤ 0.020%, S≤0.005%, the rest are Fe and impurities; Ceq: 0.38%.

[0028] 2. Desulfurization of molten iron is carried out in steelmaking, the desulfurization slag is cleaned, the slag is blocked by the converter, and the thickness of the slag layer is 90mm; the ladle is kept clean and the alloy is fully roasted; the vacuum treatment pressure holding time is 15min.

[0029] 3. The target superheat degree of the tundish is controlled at 18°C; the pouring is protected throughout the whole process, and it is put into light pressing, and the continuous casting slabs are stacked and cooled slowly for 46 hours.

[0030] 4. The heating temperature of the billet is 1190℃, and the heating time is 9min / cm; after the billet is released from the furnace, go to the descaling machine to remove the scale.

[0031] 5. Two-stage rolling is adop...

Embodiment 2

[0035] 1. The chemical composition weight percentages are: C: 0.09%, Si: 0.25%, Mn: 1.52%, Nb: 0.025%, Ti: 0.015%, Ni: 0.22%, Cu: 0.28%, Als: 0.027%, P≤ 0.020%, S≤0.005%, the rest are Fe and impurities; Ceq: 0.38%.

[0036] 2. Desulfurization of molten iron is carried out in steelmaking, the desulfurization slag is cleaned, the slag is blocked by the converter, and the thickness of the slag layer is 80mm; the ladle is clean and the alloy is fully roasted; the RH molten steel circulation time is 16min.

[0037] 3. The target superheat degree of the tundish is controlled at 20 °C; the whole process is protected and poured, and it is put into light pressing, and the continuous casting slabs are stacked and cooled slowly for 48 hours.

[0038] 4. The heating temperature of the billet is 1210℃, and the heating time is 10min / cm; after the billet is released from the furnace, go to the descaling machine to remove the scale.

[0039] 5. Two-stage rolling is adopted for hot rolling, t...

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PUM

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Abstract

A production method for a 40kg-class large heat input welding ship plate, chemical composition: C0.07~0.11%, Si0.15~0.35%, Mn1.45~1.60%, Nb0.015~0.035%, Ti0.012~ 0.018%, Ni0.15-0.30%, Cu0.20-0.35%, Als0.015-0.040%, P≤0.020%, S≤0.005%, Ceq: 0.36-0.40%. Converter slag blocking and tapping, slag layer thickness < 100mm; vacuum treatment pressure holding or RH molten steel circulation time ≥ 10min; target superheat degree of tundish < 25°C; continuous casting slab stacking and slow cooling for 45-48h. The billet heating temperature is 1180-1220°C, and the time is 9-10min / cm; the second-stage rolling temperature is 760-800°C, the second-stage total reduction is >60%, and the final rolling temperature is 740-780°C. The water inlet temperature of ACC is 710-750°C, the cooling rate is 4-8°C / s, and the red return temperature is 550-620°C. Stacking slow cooling temperature 250 ~ 350 ℃, time ≥ 24 hours. The Reh of the ship plate of the present invention is 445MPa, the Rm is 577MPa, the elongation is 25.1%, and the average impact value at -40°C is 159J.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a production method of a 40kg-class large-line energy welding ship plate. Background technique [0002] At present, steel mills at home and abroad are conducting research on steel for high-energy welding, but none of them have formed a special steel brand for high-energy welding, but are only promoted and applied as a feature of the variety of steel. Using traditional welding methods such as manual welding and submerged arc welding, the line energy is generally 30 ~ 60kJ / cm, and multi-layer welding, preheating, backing and other welding methods greatly reduce the construction efficiency. With the development of large-scale, thick and standardized steel structures in the future, in order to improve production efficiency, it is an inevitable trend to use large-line energy welding processes such as electroslag welding and gas-electric vertical welding of...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/08C22C38/16C22C38/06C21D8/02C21D6/00
CPCC22C38/04C21D6/005C21D8/0226C21D8/0247C22C38/02C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 张坤丛津功王若刚李新玲乔馨张紫茵刘源李黎明刘立强
Owner ANGANG STEEL CO LTD
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