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Welded structural bainitic high-strength steel with a yield strength of 1100mpa and its preparation method

A yield strength, welded structure technology, applied in temperature control, manufacturing tools, metal rolling, etc., can solve the problems of prolonging production cycle, increasing energy consumption, increasing investment in production line equipment, etc., to achieve short production cycle and less physical damage , good strength and toughness matching effect

Active Publication Date: 2021-01-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the off-line quenching process of the prior art not only prolongs the production cycle and increases energy consumption, but also requires additional quenching equipment and increased investment in production line equipment

Method used

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  • Welded structural bainitic high-strength steel with a yield strength of 1100mpa and its preparation method
  • Welded structural bainitic high-strength steel with a yield strength of 1100mpa and its preparation method
  • Welded structural bainitic high-strength steel with a yield strength of 1100mpa and its preparation method

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Embodiment Construction

[0037] Embodiments of the present invention will be described in detail below in conjunction with specific examples.

[0038] According to the weight percentage of chemical composition 0.05~0.09%C, 0.35~0.65%Si, 0.6~1.2%Mn, 0.04~0.10%Nb, 1.5~2.5%Cu, 0.5~0.8%Al, 2.5~4.0%Ni, 0~0.025% %Ti, the balance is Fe and unavoidable impurities, and the carbon equivalent meets the requirements of C+Mn / 6+(Ni+Cu) / 15+(Cr+Mo+V) / 5≤0.65% to smelt molten steel and obtain casting Blank. See Table 1 for the actual components by weight of the slab.

[0039] Table 1 Specific examples of the present invention Slab chemical composition weight percentage (wt.%)

[0040]

[0041] The steel plate preparation technology of embodiment sees figure 1 . The cast slab with the composition shown in Table 1 was heated to 1200°C in a heating furnace, kept for 2 hours, and then controlled rolling and controlled cooling. Among them, the rough rolling temperature is 1150 ~ 1000 ℃, the total reduction rate of r...

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Abstract

The invention discloses welding structure bainite high-strength steel with yield strength of 1100MPa and a preparation method thereof. The welding structure bainite high-strength steel is prepared from the following chemical components in percentage by weight: 0.05-0.09% of C, 0.35-0.65% of Si, 0.6-1.2% of Mn, 0.04-0.10% of Nb, 1.5-2.5% of Cu, 0.5-0.8% of Al, 2.5-4.0% of Ni, 0-0.025% of Ti, and the balance Fe and unavoidable impurities. The preparation method comprises billet smelting, controlled rolling and controlled cooling, and ageing heat treatment. According to the technical scheme, thecarbon content is low, chromium, molybdenum and boron alloy elements do not need to be added, excellent weldability is achieved, and off-line quenching is avoided.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy technology and steel rolling technology, and relates to an easy-weldable bainitic high-strength steel prepared without adding chromium, nickel, and boron alloy elements with low carbon content and without offline quenching, and specifically relates to a yield strength of 1100 MPa grade Bainitic high-strength steel with welded structure and its preparation method. Background technique [0002] Under the urgent need of high-strength construction machinery and deep-sea marine equipment, both at home and abroad attach great importance to the development and application of high-strength steel and ultra-high-strength steel. Because improving the strength of steel can not only increase the load capacity of components and improve safety performance, but also reduce its own quality, which meets the development requirements of energy saving and environmental protection. Among them, high-strength st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D6/00C21D8/02C21D9/00B21B1/02B21B37/74
CPCB21B1/026B21B37/74B21B2001/028B21B2201/06B21B2261/20C21D6/001C21D6/005C21D6/008C21D8/0221C21D9/0081C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 利成宁邸新杰段然王东坡
Owner TIANJIN UNIV