Thick-specification FH690-grade ultrahigh-strength maritime work steel plate and preparation method thereof

A FH690, ultra-high-strength technology, applied in the direction of rolling force/roll gap control, etc., can solve the problem of not meeting the -60 °C impact standard, etc., and achieve the effect of excellent strength and toughness matching comprehensive performance, cost reduction, and large thickness.

Pending Publication Date: 2022-06-28
MINMETALS YINGKOU MEDIUM PLATE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent document of publication number CN111455256A "A 690MPa easy-weldable corrosion-resistant high-strength steel and its manufacturing method" adopts the quenching and tempering process to produce 690MPa easy-weldable corrosion-resistant high-strength steel, but only guarantees the impact performance at -40°C and cannot meet the requirements of FH690 grade steel plates -60°C Shock Standard

Method used

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  • Thick-specification FH690-grade ultrahigh-strength maritime work steel plate and preparation method thereof
  • Thick-specification FH690-grade ultrahigh-strength maritime work steel plate and preparation method thereof
  • Thick-specification FH690-grade ultrahigh-strength maritime work steel plate and preparation method thereof

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preparation example Construction

[0032] Another object of the present invention is to provide the preparation method of above-mentioned steel plate, specifically comprise following production process:

[0033] 1) Smelting and casting process: Converter smelting, out-of-furnace refining, vacuum treatment and continuous casting are used for production, the O content is controlled below 30ppm, the N content is controlled below 60ppm, the H content is controlled below 2ppm, and the tundish molten steel is passed Heat ≤ 25°C, use electromagnetic stirring and light pressure, protect the casting during the whole process, and obtain continuous casting slabs after continuous casting, the thickness of the continuous casting slabs is 250~350mm, and the width is 2000~2400mm. The internal low-magnification inspection results of continuous casting slabs meet: central segregation≤class C class 1.5, intermediate cracks≤1.0, and no other crack defects;

[0034] 2) Heating process: the billet heating temperature is 1220±30°C, ...

Embodiment 1

[0043] 100mm thick marine steel, continuous casting slab size 350mm thick x 2000mm wide x 3700mm long, rolled finished steel plate size 100mm thick x 2690mm wide x 9400mm long, cold-packed, heating temperature 1220 ℃ ~ 1250 ℃, heating time 425 minutes, Two-stand two-stage controlled rolling, rough rolling start temperature 1059°C, continuous rolling to 116mm thick intermediate billet, final rolling temperature 970°C, rough rolling final rolling reduction rate 24.5%. The finish rolling start temperature is 827°C, the finish rolling temperature is 805°C, laminar cooling after rolling, the cooling rate is 15.5°C / s, the redness temperature is 604°C, and then air-cooled to room temperature. The QT process is used for heat treatment, specifically: heating the hot-rolled steel plate that is air-cooled to room temperature to 880°C for full austenitization, 300 minutes in the furnace, and then quenching and cooling to room temperature; then heating the quenched steel plate to Tempering...

Embodiment 2

[0047] 50mm thick marine steel, continuous casting slab size 350mm thick x 2000mm wide x 2410mm long, rolled finished steel plate size 50mm thick x 2690mm wide x 13000mm long, cold-packed, heating temperature 1220 ℃ ~ 1250 ℃, heating time 422 minutes; Two-stand two-stage controlled rolling, rough rolling start temperature 1027°C, continuous rolling to 111mm thick intermediate billet, final rolling temperature 983°C, rough rolling final rolling reduction rate 19.95%. The finish rolling start temperature is 855°C, the finish rolling temperature is 845°C, laminar cooling after rolling, the cooling rate is 19.6°C / s, the redness temperature is 633°C, and then air-cooled to room temperature. The QT process is used for heat treatment, specifically: heating the hot-rolled steel plate that is air-cooled to room temperature to 880°C for full austenitization, and the furnace time is 150 minutes, strictly controlling the austenitization temperature and holding time to prevent abnormally co...

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Abstract

The invention discloses a thick-specification FH690-grade ultrahigh-strength maritime work steel plate and a preparation method thereof. The thick-specification FH690-grade ultrahigh-strength maritime work steel plate is prepared from 0.08%-0.16% of C, 0.15%-0.35% of Si, 0.80%-1.50% of Mn, 0.40%-0.60% of Cr, 1.00%-1.65% of Ni, 0.20%-0.50% of Mo, 0.10%-0.35% of Cu, 0.02%-0.04% of Nb, 0.04%-0.06% of V, 0.01%-0.03% of Zr, 0.001%-0.002% of B, 0.02%-0.05% of Alt, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.006% of N and the balance Fe. The produced steel plate has good obdurability matching and excellent comprehensive mechanical properties, meets the requirements of classification society on FH690-grade steel plates, and is simple in manufacturing process and wide in adaptability.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and relates to a thick gauge FH690 grade ultra-high-strength marine steel plate and a preparation method thereof, in particular to a FH690 grade ultra-high-strength marine engineering structure quenched and tempered steel plate with a thickness of 50 mm to 100 mm and its preparation method. Background technique [0002] In today's world, resource development, utilization and strategic reserves have become important factors restricting a country's development. Most of the resources on the earth are stored in the ocean, and all countries are actively developing their own sea areas and building a variety of ocean engineering equipment. The changeable and complex marine service environment determines that the steel used in marine engineering must have high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability and good processability, which are esse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/48C22C38/46C22C38/50C22C38/54C22C38/06C22C33/04C21D8/02C21D1/18B21B37/58
CPCC22C38/02C22C38/04C22C38/44C22C38/42C22C38/48C22C38/46C22C38/50C22C38/54C22C38/06C22C33/04C21D8/0205C21D8/0226C21D8/0247C21D1/18B21B37/58C21D2211/009
Inventor 王树国张游游王川武会宾杨海峰李志超王东明曲之国张友建于浩
Owner MINMETALS YINGKOU MEDIUM PLATE
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