Thick steel plate for low temperature use and capable of being welded in superhigh energy and its production process

A manufacturing method and technology of line energy, applied in welding medium, manufacturing tools, temperature control, etc., can solve problems affecting the manufacturing efficiency and application range of steel structures, unstable low temperature toughness of thick steel plates, and thick plates that cannot withstand ultra-high line energy welding, etc. question

Active Publication Date: 2007-10-03
BAOSHAN IRON & STEEL CO LTD
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  • Claims
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Problems solved by technology

[0005] However, the C/Mn of the above-mentioned thick steel plates used in the world is generally low, generally above 0.05, and there is no special composite Al, Ti, B, N microalloying treatment, which is reflected in the absence of Al, Ti, B, The quantitative relationship between N makes the low-temperature toughness

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  • Thick steel plate for low temperature use and capable of being welded in superhigh energy and its production process
  • Thick steel plate for low temperature use and capable of being welded in superhigh energy and its production process

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Example Embodiment

[0056] See Table 1 to Table 3 for specific examples.

[0057]

[0058] * Kawasaki Steel

[0059]

[0060]

[0061] * Kawasaki Steel

[0062] In the embodiment of the present invention, the alloying of precious elements such as Ni, Cr, Mo, Cu, etc. is removed, especially the alloying of Ni is removed, and the TMCP process is optimized. While obtaining uniform and excellent low-temperature toughness of the base material steel plate, the ultra-large wire The low temperature toughness of HAZ during energy welding is also excellent. This can not only reduce the manufacturing cost and shorten the production cycle, but also reduce the difficulty of production organization [The steel plate with high content of Ni, Cu, and Mo has poor surface quality of continuous casting slabs, and generally requires offline surface cleaning, sometimes even Need to carry out surface color penetration inspection (the so-called PT inspection) and warm cutting, etc., resulting i...

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Abstract

The thick steel plate for low temperature use and capable of being welded in superhigh energy has the material comprising C 0.030-0.050 wt%, Si not more than 0.2 wt%, Mn 1.50-1.80 wt%, P not more than 0.01 wt%, S not more than 0.002 wt%, Nb 0.010-0.020 wt%, Als 0.040-0.060 wt%, Ti 0.008-0.012 wt%, N not more than 0.0035 wt%, Ca 0.001-0.005 wt%, B 0.001-0.003 wt%, and Fe and inevitable impurity for the rest, with Pcm not more than 0.18 wt%. The present invention has low alloy steel as basis, properly raised Als content, C/Mn ratio of 0.020-0.050, Ti-B microalloying, Ca or REM treatment, Ti/N ratio of 3.0-3.5, optimized TMCP treatment, microscopic structure comprising small amount of ferrite and diffused bainite crystal of average crystal grain size below 15 micron, excellent mechanical performance and welding performance, and is especially suitable for being used as high strength ship deck, low temperature pressure container, offshore platform, etc.

Description

technical field [0001] The invention relates to a thick steel plate with a yield strength ≥ 415 MPa in a low C-high Mn-high Als-Ti-B alloy system that can be welded with super large heat input and a manufacturing method thereof. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridges, pressure vessels, building structures, automobile industry, railway transportation and machinery manufacturing . The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are the most important properties of low-carbon (high-strength) low-alloy steel, which are ultimately determined by the finished steel state of the microstructure. With the continuous development of science and tech...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02C21D11/00B23K35/22B21B37/56B21B37/74B22D11/16
Inventor 刘自成施青
Owner BAOSHAN IRON & STEEL CO LTD
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