Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof

A low-temperature impact toughness, ultra-high strength technology, applied in the direction of temperature control, metal rolling, etc., can solve the problems of failure to meet the performance index of ship plate steel, increase the difficulty of control, increase the difficulty of manufacturing, etc., achieve good welding performance, improve Mechanical properties, easy-to-manipulate effects

Active Publication Date: 2010-07-21
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention patent with the publication number CN101289728A proposes a high-strength and high-toughness steel plate with low yield ratio and high heat input welding. The yield strength exceeds 500 MPa, but the composition design is relatively complicated. The content of Mo is 0.10-0.40%. Low-temperature impact toughness The performance test results are limited to the condition of -40°C, which does not reach the performance index of F-grade (impact toughness at ...

Method used

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  • Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof
  • Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof
  • Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 The thickness of the medium and thick ship plate steel with ultra-high strength and low temperature impact toughness involved in this example is 32mm, and the components and weight percentages contained therein are: C 0.05%, Si 0.24%, Mn 1.60%, P0 .012%, S 0.0028 / %, Nb 0.076%, Ti 0.016%, Cu 0.31%, Ni 0.25%, Cr 0.25%, Mo 0.2%, Al 0.042% and the balance Fe and inevitable impurity elements.

[0049] The medium-thickness ship plate steel of this embodiment is prepared through the following process:

[0050] Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, smelt and cast them to form ingots with a thickness of 150mm;

[0051] Heat the ingot to 1250℃ for 2h;

[0052] The ingot is rolled in two stages, in which the opening temperature of rough rolling in the first stage is 1050℃, and the total reduction ratio is 50-60%; the opening temperature of finishing rolling in the second stage is 820℃; the total reduction ra...

Embodiment 2

[0054] Example 2 The specification and composition of the medium and thick ship plate steel with ultra-high strength and low temperature impact toughness involved in this embodiment are the same as those in Example 1, but the preparation process of the medium and thick ship plate steel is:

[0055] Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, smelt and cast them to form a continuous casting billet with a thickness of 150mm;

[0056] Heat the continuous casting slab to 1150℃ for 2h;

[0057] The continuous casting billet is rolled in two stages, in which the opening temperature of the rough rolling in the first stage is 1080°C, and the thickness to be heated is 90mm; the opening temperature of the second stage finishing rolling is 920°C; the total reduction rate is 64%.

[0058] The rolled steel plate enters laminar flow cooling for water cooling, the opening cooling temperature is 780℃, the final cooling temperature is 40...

Embodiment 3

[0059] Example 3 The thickness of the medium and thick ship plate steel with ultra-high strength and low temperature impact toughness involved in this example is 18mm, and the components and weight percentages contained therein are: C 0.05%, Si 0.22%, Mn 1.64%, P0 .01%, S 0.0020 / %, Nb 0.06%, Ti 0.013%, Cu 0.15%, Cr 0.25%, Ni 0.17%, Mo 0.1%, Al 0.04% and the balance Fe and unavoidable impurity elements.

[0060] The medium-thickness ship plate steel of this embodiment can be prepared through the following process:

[0061] According to the chemical composition of the above-mentioned ship plate steel, smelting raw materials are prepared, smelted and poured. The implementation material is taken from an industrial continuous casting billet, 160mm high, 150mm wide and 250mm long.

[0062] Heat the implementation blank to 1250°C for 2h;

[0063] The implementation billet is rolled in two stages, in which the opening temperature of the rough rolling in the first stage is 1100°C, the thickne...

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Abstract

The invention relates to medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and a manufacturing method thereof. The ship plate steel comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.15 to 0.35 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.04 to 0.08 percent of Nb, 0.10 to 0.20 percent of TiO, 0.20 to 0.50 percent of Cu, less than or equal to 0.30 percent of Cr, 0.20 to 0.50 percent of Ni, 0.02 to 0.05 percent of Al, 0.1 to 0.3 percent of Mo and the balance of Fe and impurities. A process comprises the following steps of: performing heating, heat insulation, two-stage rolling and cooling treatment on a precast continuous casting in sequence to manufacture finished product ship plate steel. The ship plate steel has simple component design, high comprehensive mechanical performance and high welding performance; and the preparation process is simple and easy to manipulate.

Description

Technical field [0001] The invention relates to a special steel plate and a preparation process thereof, in particular to an ultra-high-strength medium-thick ship plate steel with excellent low-temperature toughness and a 550MPa yield strength and a manufacturing method thereof. Background technique [0002] Ship plate steel is one of the main special plate varieties for wide and heavy plates. my country is a big country in the shipbuilding industry and has a huge demand for ship sheet steel. According to relevant statistics, my country's shipbuilding industry completed 30 million tons last year and actually consumed 12 million tons of shipbuilding steel plates. With the rapid development of my country's shipbuilding industry, the shipbuilding industry is also increasingly large-scale and light-weight. Therefore, general-strength ship plates can no longer meet the needs of the hull, and the application proportion of high-strength, high-quality grade E and F-class ship plates is ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/16B21B1/30B21B37/74
Inventor 李庆亮张怀征刘东升
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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