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EW460 extra-thick maritime steel plate and manufacturing method thereof

A manufacturing method and steel plate technology, applied in the direction of manufacturing tools, temperature control, metal rolling, etc., can solve problems such as ambiguity, achieve excellent mechanical properties, improve the shape of inclusions, and have wide applicability

Inactive Publication Date: 2021-03-09
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of the two patents is not clear. In order to improve the welding performance, the content of Cr, Cu, C, Si, Mn and other elements should be controlled.

Method used

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  • EW460 extra-thick maritime steel plate and manufacturing method thereof
  • EW460 extra-thick maritime steel plate and manufacturing method thereof
  • EW460 extra-thick maritime steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The production method of the 81mm thick EW460 extra-thick marine steel plate of embodiment 1 is specifically as follows:

[0025] Steelmaking and continuous casting process: after desulfurization of molten iron, the target sulfur is 0.002%; converter smelting adopts high-blowing and low-drawing method for dephosphorization, the drain port is clean and free of defects, converter tapping slag; refining adopts white slag operation, and the white slag retention time is 20 minutes , the target alkalinity is 5; the holding time of vacuum treatment is 25 minutes; seamless calcium line treatment is carried out after vacuum treatment; five-hole nozzle is used for casting, the target temperature of continuous casting tundish is liquidus temperature + 15 ℃, and the casting speed is stable;

[0026] Rolling process: controlled rolling and controlled cooling process is adopted, which is two-stage rolling; the heating temperature of the continuous casting slab before rolling is 1180 ℃...

Embodiment 2

[0027] The production method of the 90mm thick EW460 extra-thick marine steel plate of embodiment 2 is specifically as follows:

[0028] Steelmaking and continuous casting process: after desulfurization of molten iron, the target sulfur is 0.0017%; converter smelting adopts high-blowing and low-drawing method for dephosphorization, the drain port is clean and free of defects, converter tapping slag; refining adopts white slag operation, white slag retention time is 22 minutes , the target alkalinity is 6; the holding time of vacuum treatment is 30 minutes; seamless calcium line treatment is carried out after vacuum treatment; casting uses five-hole nozzles, the target temperature of continuous casting tundish is liquidus temperature + 10 ℃, and the casting speed is stable;

[0029] Rolling process: controlled rolling and controlled cooling process is adopted, which is two-stage rolling; the heating temperature of continuous casting slab before rolling is 1130 ℃; the rough rolli...

Embodiment 3

[0030] The production method of the 100mm thick EW460 extra-thick marine steel plate of embodiment 3 is specifically as follows:

[0031]Steelmaking and continuous casting process: after desulfurization of molten iron, the target sulfur is 0.0015%; converter smelting adopts high-blowing and low-drawing method for dephosphorization, the drain port is clean and free of defects, converter tapping slag; refining adopts white slag operation, white slag retention time is 24 minutes , the target alkalinity is 7; the holding time of vacuum treatment is 34 minutes; seamless calcium line treatment is carried out after vacuum treatment; five-hole nozzle is used for casting, the target temperature of continuous casting tundish is liquidus temperature + 5 ℃, and the casting speed is stable;

[0032] Rolling process: controlled rolling and controlled cooling process is adopted, which is two-stage rolling; the heating temperature of the continuous casting slab before rolling is 1110 ℃; the ro...

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Abstract

The invention discloses an EW460 extra-thick maritime steel plate and a manufacturing method thereof, and relates to the technical field of steel production. Through smelting of clean steel, internaldefects such as blank segregation and looseness are reduced, and inclusion elements As, Sn, Sb, Pb, Bi and B are controlled; columnar crystals are crushed and austenite grains are refined through rough rolling at high temperature, low speed and high pressure; and the purposes of controlling the structure form and the grain size are achieved through finish rolling accumulated deformation and matched cooling control.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to an EW460 extra-thick marine steel plate and a manufacturing method thereof. Background technique [0002] my country's development of offshore oil started late, and it was not until the 1980s that it had its own offshore oil platform. In the past 10 years, domestic offshore platform steel plates have not been widely used in my country's offshore oil projects. At present, my country has basically achieved localization of steel for offshore platforms below EH36, accounting for 90% of the steel used for platforms. In the field of marine engineering equipment and high-tech ships, it will vigorously develop deep-sea exploration, resource development and utilization, offshore operation support equipment and its key components. Systems and special equipment; promoting the development and engineering of deep-sea space stations and large floating structures will inevitably increas...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/60C21C1/02C21C7/00C21C7/064C21C7/10C21D6/00C21D8/02C21D9/00C22C33/04B21B37/74B21B45/02
CPCB21B37/74B21B45/0203C21C1/02C21C7/0006C21C7/064C21C7/10C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/001C21D2211/002C21D2211/005C22C33/04C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C22C38/60
Inventor 车马俊赵晋斌陈林恒张晓雪李恒坤邱保文伯飞虎黄建华
Owner NANJING IRON & STEEL CO LTD
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