A kind of 500mpa wear-resistant and impact-resistant fracture steel and its preparation process
A preparation process and impact-resistant technology, applied in the field of steel materials, can solve the problems that are not conducive to improving the safety of large-scale heavy oil tankers, low steel toughness, long production process, etc., to improve the safe use performance of the hull, improve wear resistance, easy-to-use effects
Active Publication Date: 2020-02-18
武汉钢铁有限公司
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Problems solved by technology
The invention adjusts the chemical composition of the steel plate, combined with appropriate smelting, heating, rolling, heat treatment and other process technologies, the steel plate produced has excellent mechanical properties and significantly improved corrosion resistance; but the toughness of this steel is relatively low, which is not conducive to improving The safety of large-scale heavy-duty oil tankers, container ships, and icebreakers traveling in polar alpine waters, and the production methods of steel plates include smelting + continuous casting, electroslag remelting, heating, rolling, hydrogen expansion, quenching, and tempering processes, and the production process is long. expensive
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Embodiment 1～8
[0039] The chemical composition of the 500MPa wear-resistant and impact-resistant fracture steel described in Examples 1 to 8 is shown in Table 1, and the process parameters are shown in Table 2; the specific preparation method includes the following steps:
[0040] 1) Carry out desulfurization of molten iron, and control S≤0.001% in molten iron;
[0041] 2) Carry out converter smelting, and control molten steel C: 0.041~0.106%, P≤0.010%;
[0042] 3) Conventional continuous casting and heating of the slab, the heating temperature is controlled at 1205-1290°C;
[0043] 4) Carry out segmental rolling, the starting temperature of rough rolling is 1085-1198°C, and the number of rough rolling passes is controlled not higher than 5 passes; the starting temperature of finish rolling is controlled not higher than 988°C, and the finish rolling temperature is controlled at 810~875℃, the number of finishing rolling passes is not higher than 5 passes, and the cumulative reduction rate of...
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Abstract
The invention discloses 500MPa-grade wear-resisting anti-impact-breaking steel including, by mass, 0.041-0.106% of C, 0.10-0.45% of Si, 0.82-1.85% of Mn, not more than 0.010% of P, not more than 0.004% of S, 0.045-0.095% of Als, 0.030-0.060% of Nb, 0.038-0.060% of V, 0.030-0.105% of Ti, 1.35-2.61% of Ni, 0.31-0.80% of Mo, 0.30-0.60% of Cr, and one or two of Zr and Re. The steel has high strength,anti-impact-breaking effect and wear resistance and is especially suitable for extreme environment, such as arctic ice zone, for improving safe application performance of ship body. The preparation process is simple and low-cost and is suitable for promotion and application.
Description
technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a 500MPa-grade wear-resistant impact-resistant fracture steel and a preparation process thereof. Background technique [0002] The ocean is rich in resources. The opening of the Arctic waterway has saved a lot of ocean transportation resources for all countries, and promoted the development of new concept ships such as Arctic shuttle tankers, icebreakers, and icebreaker container ships. Requirements: On the one hand, these ship steels are required to have high strength and excellent toughness, especially impact fracture resistance (such as NDT performance); on the other hand, the long-term contact between the hull and the ice surface also requires the steel to have certain wear resistance performance. [0003] China Invention Patent Application No. CN201210067794.4 discloses an extra-thick, high-strength, excellent low-temperature toughness steel pla...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C33/04C21C5/28C21C1/02C21D8/02
CPCC21C1/02C21C5/28C21D8/0205C22C33/04C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 张开广陈颜堂范巍郭斌童明伟
Owner 武汉钢铁有限公司