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Boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and preparation method thereof

A technology of high hardenability and marine steel, which is applied in the field of material processing, can solve difficult problems such as performance uniformity and hardenability, and achieve the effects of cost control, inhibition of nucleation and growth, and improvement of hardenability

Active Publication Date: 2022-02-25
YANSHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of various factors such as chemical composition, process and structure, it is often difficult to obtain ideal performance uniformity and hardenability for high-strength and tough marine engineering steels.

Method used

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  • Boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and preparation method thereof
  • Boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and preparation method thereof
  • Boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A boron-free medium-nickel high-strength high-hardenability marine steel thick plate provided in this example has the following chemical composition and mass percentage: C: 0.088%; Si: 0.24%; Mn: 0.73%; Ni: 1.98% ; Cr: 0.61%; Mo: 0.35%; V: 0.09%; N: 0.0063%; Al: 0.024%; Cu: 0.32%;

[0045] The production method of this embodiment includes smelting, continuous casting, hot rolling and heat treatment processes.

[0046] 1. Smelting process: Carry out vacuum induction smelting and electroslag remelting according to the components and their contents in Example 1, control the nickel content in the converter, and cast into slabs;

[0047] 2. Hot rolling process: put the continuous casting slab obtained through the smelting and continuous casting process in the heating furnace, heat and keep it uniform, the temperature is 1280 ℃, and the thickness of the slab is 300mm; the two-stage differential temperature rolling process is adopted to start The temperature of the billet is ...

Embodiment 2

[0051] A boron-free, low-nickel, high-strength, high-hardenability marine steel thick plate provided in this example has the following chemical composition and mass percentage: C: 0.096%; Si: 0.28%; Mn: 0.73%; Ni: 1.55% ; Cr: 0.77%; Mo: 0.35%; V: 0.15%; N: 0.0079%; Al: 0.026%; Cu: 0.37%;

[0052] The production method of this embodiment includes smelting, continuous casting, hot rolling, and heat treatment processes.

[0053] 1. Smelting process: Carry out vacuum induction smelting and electroslag remelting according to the components and their contents in Example 2, control the nickel content in the converter, and cast into slabs;

[0054] 2. Hot rolling process: the continuous casting slab obtained through smelting and continuous casting process is placed in the heating furnace, heated and kept uniform, the temperature is 1250 ℃, and the thickness of the slab is 180mm; the two-stage differential temperature rolling process is adopted, and the The temperature of the billet i...

Embodiment 3

[0058] A boron-free, low-nickel, high-strength, high-hardenability marine steel thick plate provided in this example has the following chemical composition and mass percentage: C: 0.094%; Si: 0.32%; Mn: 0.80%; Ni: 1.67 %; Cr: 0.78%; Mo: 0.38%; V: 0.17%; N: 0.0092%; Al: 0.029%; Cu: 0.35%;

[0059] The production method of this embodiment includes smelting, continuous casting, hot rolling, and heat treatment processes.

[0060] 1. Smelting process: Carry out vacuum induction smelting and electroslag remelting according to the components and their contents in Example 3, control the nickel content in the converter, and cast into slabs;

[0061] 2. Hot rolling process: the continuous casting slab obtained through the smelting and continuous casting process is placed in a heating furnace, heated and kept uniform, the temperature is 1270°C, and the thickness of the slab is 250mm; a two-stage differential temperature rolling process is adopted to start The temperature of the billet i...

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Abstract

The invention provides a boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and a preparation method thereof. The boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate comprises the following chemical components in percentage by mass: 0.07-0.11% of C, 0.15-0.35% of Si, 0.50-0.90% of Mn, 1.50-2.00% of Ni, 0.60-0.90% of Cr, 0.20-0.40% of Mo, 0.09-0.18% of V, 0.006-0.010% of N, 0.02-0.03% of Al, 0.3-0.5% of Cu and the balance of iron and inevitable impurities. The marine steel thick plate produced by the invention has the advantages of high strength, high hardenability, good low-temperature impact toughness, uniform structure property and the like, the yield strength of the marine steel thick plate is greater than 1000MPa, the elongation is greater than 16%, the percentage reduction of area is greater than 40%, the impact energy at -20 DEG C is greater than 70J, the impact energy at -80 DEG C is greater than 40J, and the marine steel thick plate is suitable for a marine environment. No boron element is added into the steel, so that the risk of steel brittleness caused by addition of B can be reduced. The nickel element is added, so that the cost of the steel can be effectively controlled while the low-temperature performance of the steel is effectively improved.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a boron-free medium-low-nickel high-strength high-hardenability marine steel thick plate and a preparation method thereof. Background technique [0002] Offshore engineering steel (hereinafter referred to as "offshore steel") is mainly used in the fields of offshore platforms, marine energy equipment, submarine oil and gas pipelines, oil and gas storage and transportation, and military ship manufacturing. The harsh marine environment requires marine steel to have high strength, high toughness, excellent fatigue resistance, lamellar tear resistance, seawater corrosion resistance and good welding performance. With the rapid development of shipbuilding and offshore oil industry, high quality, large size, easy welding and long service life have become the main direction of marine steel development. [0003] The uniformity of microstructure and performance is the most imp...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C33/04C21D8/02C21D11/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/42C22C38/06C22C38/001C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D11/00
Inventor 吕知清陈振业齐建军傅万堂龙杰张朋王薇张恒
Owner YANSHAN UNIV
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