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NV-F690 ultrahigh strength ship plate steel and manufacture method thereof

A NV-F690, ultra-high-strength technology, applied in the field of NV-F690 ultra-high-strength ship plate steel and its preparation, can solve the problems of not meeting the Charpy impact energy standard at -60°C, achieve improved mechanical properties, and simplify production Process, the effect of improving production efficiency

Active Publication Date: 2012-07-11
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

[0007] The invention patent with the publication number CN101418418A (application number 200710094178.7) proposes a method for manufacturing a low-crack-sensitive steel plate with a yield strength of 690 MPa, with a maximum thickness of 60 mm, but only guarantees the impact energy at -20 °C, which cannot meet the requirements of NV-F690 steel plate Required Charpy impact energy standard at -60°C

Method used

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  • NV-F690 ultrahigh strength ship plate steel and manufacture method thereof
  • NV-F690 ultrahigh strength ship plate steel and manufacture method thereof
  • NV-F690 ultrahigh strength ship plate steel and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The NV-F690 ultra-high-strength ship plate steel involved in this example has a thickness of 20mm, and its components and their weight percentages are: C 0.04%, Si 0.27%, Mn 0.60%, P 0.006%, S 0.005%, Nb 0.02%, Ti 0.015%, Cu 1.10%, Ni 0.86%, Cr 0.65%, Mo 0.26%, Al 0.024%, and the balance of Fe and unavoidable impurity elements.

[0036] The preparation process of NV-F690 ultra-high strength ship plate steel involved in this embodiment is as follows:

[0037] Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, smelt in a 150kg vacuum induction furnace and pour into ingots, forging into billets with specifications of 115mm×115mm×240mm;

[0038] Heat the billet to 1180°C and keep it warm for 2 hours;

[0039] The starting temperature of the rough rolling of the billet in the first stage is 1120°C, the total reduction ratio is 36%, the starting temperature of the second stage finish rolling is 850°C, the total reduc...

Embodiment 2

[0044] The NV-F690 ultra-high-strength ship plate steel involved in this example has a thickness of 32mm, and its components and their weight percentages are: C 0.04%, Si 0.24%, Mn 0.84%, P 0.007%, S 0.004%, Nb 0.04%, Ti 0.009%, Cu 1.15%, Ni 1.94%, Cr 0.50%, Mo 0.51%, Al 0.03%, and the balance of Fe and unavoidable impurity elements.

[0045] The preparation process of NV-F690 ultra-high strength ship plate steel involved in this embodiment is as follows:

[0046] Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, smelt in a 150kg vacuum induction furnace and pour into ingots, forging into billets with specifications of 140mm×140mm×210mm;

[0047] Heat the billet to 1180°C and keep it warm for 2 hours;

[0048] The starting temperature of the rough rolling of the steel plate in the first stage is 1120°C, the total reduction ratio is 47%, the starting temperature of the second stage finish rolling is 890°C, the total r...

Embodiment 3

[0055] The NV-F690 ultra-high-strength ship plate steel involved in this example has a thickness of 20mm, and its components and their weight percentages are: C 0.04%, Si 0.24%, Mn 0.91%, P 0.007%, S 0.004%, Nb 0.04%, Ti 0.015%, Cu 1.27%, Ni 1.79%, Cr 0.50%, Mo 0.51%, Al 0.03%, and the balance of Fe and unavoidable impurity elements.

[0056] The preparation process of NV-F690 ultra-high strength ship plate steel involved in this embodiment is as follows:

[0057] Prepare smelting raw materials according to the chemical composition of the above-mentioned ship plate steel, smelt in a 150kg vacuum induction furnace and pour into ingots, and process them into blanks with specifications of 115mm×115mm×240mm;

[0058] Heat the billet to 1180°C and keep it warm for 2 hours;

[0059] The starting temperature of the rough rolling of the steel plate in the first stage is 1120°C, the total reduction ratio is 36%, the starting temperature of the second stage finish rolling is 850°C, the...

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Abstract

The invention relates to NV-F690 ultrahigh strength ship plate steel and a manufacture method thereof. The ship plate steel takes Fe as the substrate, and comprises the following components (wt%): 0.03-0.05% of C, 0.10-0.35% of Si, 0.50-1.60% of Mn, 0.02-0.05% of Nb, 0.009-0.02% of Ti, 1.00-1.70% of Cu, less than or equal to 0.70% of Cr, 0.8-2.0% of Ni, 0.01-0.04% of Al, 0.1-0.6% of Mo, less than or equal to 0.020% of P, less than or equal to 0.010% of S and impurities. The method is as follows: sequentially carrying out heating, insulating, hot rolling, cooling and heat treatment on continuously cast blooms with the same components as the above-mentioned ship plate to form the finished ship plate steel. The ship plate steel obtained according to the invention has yield strength of more than 690MPa and good low temperature impact toughness, and is suitable for applications in the manufacture field of ships and offshore oil platforms.

Description

technical field [0001] The invention relates to a ship plate steel and a preparation method thereof, in particular to NV-F690 ultra-high-strength ship plate steel with excellent low-temperature toughness and a yield strength level of 690MPa and a preparation method thereof. Background technique [0002] With the enlargement of ships and the development of deep-sea oil and gas fields, the demand for lightweight and high-carrying capacity construction has increased, which provides a broad application prospect for the application of high-strength hull structural steel. At present, the mechanical properties meet the standard of Det Norske Veritas (DNV) NV-F690 (room temperature yield strength R p0.2 ≥690MPa, tensile strength R m ≥770MPa, Elongation A 5 ≥14%, Charpy impact energy at -60℃ v E-60 ≥ 46J, as shown in Table 1), the commercial manufacturing process of high-grade large-thickness (20-50mm) steel plates has not been reported in China. [0003] For example, the inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/50C22C38/58C21D8/02
Inventor 程丙贵刘东升罗咪朱浩
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE