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Low-temperature high-toughness F460 grade super strength steel plate for building ship and manufacturing method thereof

An ultra-high-strength, marine steel plate technology, used in manufacturing tools, heat treatment process control, heat treatment equipment, etc., can solve the problems of difficult manufacturing, complex composition design, unachieved, etc., to achieve good welding performance and improve mechanical properties.

Active Publication Date: 2010-05-12
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, the invention patent with the publication number CN101289728A also proposes a low yield strength ratio weldable high-strength high-toughness steel plate and its manufacturing method. The yield strength of the steel plate exceeds 500MPa, but the composition design is relatively complicated. It is 0.10~0.40%, and the production process requirements are relatively strict (requires that the steel plate with a thickness ≥ 40mm should be cooled slowly at ≥ 300 ℃ for no less than 24 hours), the manufacture is difficult, and its low temperature impact toughness is limited to -40 ℃ The performance test results did not reach the performance index of F-class ship plate steel
[0005] In addition, the invention patent with the publication number CN101255528A proposes a niobium-containing steel plate with excellent ultra-low temperature toughness and its rolling method. Water spray cooling is used between rolling, which increases the difficulty of control in actual production

Method used

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  • Low-temperature high-toughness F460 grade super strength steel plate for building ship and manufacturing method thereof
  • Low-temperature high-toughness F460 grade super strength steel plate for building ship and manufacturing method thereof
  • Low-temperature high-toughness F460 grade super strength steel plate for building ship and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The low-temperature high-toughness F460 grade ultra-high-strength steel plate for shipbuilding contains components and their weight percentages: C0.06%, Si 0.23%, Mn 1.45%, P 0.008%, S 0.0009%, Nb 0.032%, V 0.04%, Ti 0.019%, Cu 0.23%, Cr 0.151%, Ni 0.22%, Al 0.042%, and the balance of Fe and unavoidable impurity elements.

[0039] The low-temperature high-toughness F460 grade ultra-high-strength shipbuilding steel plate has a thickness of 60mm, yield strength ≥ 460MPa, tensile strength ≥ 570MPa, elongation ≥ 17%, and impact energy at -60°C ≥ 31J. And if Figure 1~3 As shown, the metallographic structure of the marine steel plate is acicular ferrite + polygonal ferrite.

[0040] The preparation process of the low-temperature high-toughness F460 grade ultra-high-strength steel plate for shipbuilding is as follows:

[0041] Prepare smelting raw materials according to the composition of the shipbuilding steel plate, melt and cast it to form a continuous casting slab with ...

Embodiment 2

[0047] The low-temperature high-toughness F460 grade ultra-high-strength steel plate for shipbuilding contains components and their weight percentages: C0.06%, Si 0.23%, Mn 1.45%, P 0.008%, S 0.0009%, Nb 0.032%, V 0.04%, Ti 0.019%, Cu 0.23%, Cr 0.151%, Ni 0.22%, Al 0.042%, and the balance of Fe and unavoidable impurity elements.

[0048] The low-temperature high-toughness F460 grade ultra-high-strength steel plate for shipbuilding has a thickness of 50mm. In the controlled rolling process, the starting temperature of rough rolling is 1030°C, the thickness to be warmed is 150mm, and the starting temperature of finish rolling is 830°C; in the controlled cooling process, the starting cooling temperature is controlled at 790°C, the final cooling temperature is 500°C, The speed is 10°C / s.

[0049] The impact properties of the low-temperature high-toughness F460 grade ultra-high-strength shipbuilding steel plate under the conditions of hot rolling, strain aging, stress relief annea...

Embodiment 3

[0051] The low-temperature high-toughness F460 grade ultra-high-strength steel plate for shipbuilding contains components and their weight percentages: C0.06%, Si 0.23%, Mn 1.45%, P 0.008%, S 0.0009%, Nb 0.032%, V 0.04%, Ti 0.019%, Cu 0.23%, Cr 0.151%, Ni 0.22%, Al 0.042%, and the balance of Fe and unavoidable impurity elements.

[0052] The low-temperature high-toughness F460 grade ultra-high-strength shipbuilding steel plate has a thickness of 18mm. Billet heating temperature is 1250°C, heat preservation 2.5h, rough rolling start temperature is 1110°C, waiting temperature is 64mm, finish rolling start temperature is 870°C, start cooling temperature is 830°C, final cooling temperature is 500°C, cooling rate is 12°C / s.

[0053] The mechanical properties of the low-temperature high-toughness F460 grade ultra-high-strength shipbuilding steel plate are shown in Table 8.

[0054] The above-mentioned embodiments are only to illustrate the technical concept and characteristics of ...

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Abstract

The invention relates to a low-temperature high-toughness F460 grade super strength steel plate for building ship and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: 0.05-0.15 percent of C, 0.15-0.35 percent of Si, 1.20-1.70 percent of Mn, not more than 0.020 percent of P, not more than 0.010 percent of S, 0.02-0.04 percent of Nb, 0.04-0.06 percent of V, 0.010-0.020 percent of Ti, 0.15-0.40 percent of Cu, 0.10-0.30 percent of Cr, 0.15-0.40 percent of Ni, 0.02-0.05 percent of Al and the balance of Fe and inevitable impurities. The steel plate for building ship is obtained by the following steps: heating a continuous casting billet; heat insulation treatment; hot rolling; and finally cooling the steel plate. The invention considers the service environment of the steel plate and carries out composition and process design so as to ensure that products have excellent mechanical property under multi-element condition, and has simple preparation process and low cost.

Description

technical field [0001] The present invention relates to a thick-gauge ultra-high-strength steel plate and a manufacturing method thereof, in particular to a low-temperature (-60°C) high-toughness F460 grade ultra-high-strength shipbuilding thick steel plate (≤60mm) and a manufacturing method thereof. Background technique [0002] Ship plate steel is one of the main special plate varieties of wide and thick plates. In recent years, the rapid development of my country's shipbuilding industry has led to a rapid increase in the demand for marine steel plates, especially wide and thick plates. It is reported that my country's shipbuilding industry completed 30 million tons last year, and actually consumed 12 million tons of steel plates for shipbuilding. At the same time, with the development of the modern shipbuilding industry in the direction of large-scale and light weight, the general-strength ship plates can no longer meet the needs of the hull, and the application proporti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C21D8/02C21D11/00
Inventor 李庆亮张怀征朱浩刘东升
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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