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Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof

A technology of carbon bainite steel and seawater resistance, which is applied in temperature control and other directions, can solve the problems of high preparation cost and poor comprehensive performance of seawater corrosion-resistant steel, and achieve low raw material cost, excellent mechanical properties and weldability, The effect of simple production process

Active Publication Date: 2010-11-10
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of poor comprehensive performance and high preparation cost of the existing seawater corrosion-resistant steel, the present invention provides a seawater corrosion-resistant ultra-low carbon bainite steel and a preparation method thereof

Method used

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  • Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof
  • Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof
  • Seawater corrosion resistant ultra-low carbon bainite steel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Composition by weight percentage is C 0.03%, Mn 1.17%, S 0.005%, Si 0.27%, P 0.048%, Ni 0.15%, Cu 0.3%, Nb 0.038%, Mo 0.21%, B 0.0038%, Al 0.078%, Cr 0.06%, the balance is Fe, and the structure is bainite.

[0032] The above-mentioned low-carbon bainitic steel has a yield strength of 540MPa, a tensile strength of 690MPa, an elongation after fracture of 32%, a reduction of area of ​​69.4%, a longitudinal impact absorption energy of 140.1J at room temperature, and a longitudinal impact absorption energy of -40°C of 127.8J. .

[0033] The welding cold crack sensitivity coefficient of the above-mentioned low carbon bainite steel is 0.15, and the weather resistance index is 6.29-6.95.

[0034]The preparation method is as follows: smelt molten steel according to the above composition and cast it into ingot, raise the temperature of the ingot to 1200°C for soaking for 3 hours, and then carry out two-stage rolling, among which, the rough rolling in the austenite recrystallizat...

Embodiment 2

[0039] Composition by weight percentage is C 0.03%, Mn 1.14%, S 0.005%, Si 0.28%, P 0.09%, Ni 0.15%, Cu0.3%, Nb 0.036%, Mo 0.22%, B 0.0038%, Al 0.067%, Cr 0.06%, the balance is Fe, and the structure is bainite.

[0040] The above-mentioned low-carbon bainitic steel has a yield strength of 575 MPa, a tensile strength of 720 MPa, an elongation after fracture of 32.8%, a reduction of area of ​​70.0%, a room temperature longitudinal impact absorption energy of 134.6J, and a longitudinal impact absorption energy of -40°C of 97.8 J.

[0041] The welding cold crack sensitivity coefficient of the above-mentioned low carbon bainite steel is 0.15, and the weather resistance index is 6.95.

[0042] The preparation method is as follows: smelt molten steel according to the above composition and cast it into ingot, raise the temperature of the ingot to 1230°C for soaking for 2.5 hours, and then carry out two-stage rolling. ℃, the finishing temperature of rough rolling is 1000℃, and the cu...

Embodiment 3

[0045] Composition by weight percentage is C 0.02%, Mn 1.05%, S 0.004%, Si 0.40%, P 0.08%, Ni 0.05%, Cu0.4%, Nb 0.03%, Mo 0.31%, B 0.0022%, Al 0.071%, Cr 0.05%, the balance is Fe, and the structure is bainite.

[0046] The above-mentioned low-carbon bainite steel has a yield strength of 563MPa, a tensile strength of 705MPa, an elongation after fracture of 32.5%, a reduction of area of ​​73%, a longitudinal impact absorption energy of 131J at room temperature, and a longitudinal impact absorption energy of -40°C of 101.3J.

[0047] The above-mentioned low-carbon bainite steel has a welding cold crack sensitivity coefficient of 0.13 and a weather resistance index of 6.56.

[0048] The preparation method is as follows: smelt molten steel according to the above composition and cast it into ingot, raise the temperature of the ingot to 1220°C for soaking for 2 hours, and then carry out two-stage rolling, among which, the rough rolling in the austenite recrystallization zone starts a...

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Abstract

The invention discloses seawater corrosion resistant ultra-low carbon bainite steel and a preparation method thereof. The bainite steel comprises the following components in percentage by weight: 0.02 to 0.05 percent of C, 1.0 to 1.5 percent of Mn, less than 0.006 percent of S, 0.24 to 0.40 percent of Si, 0.04 to 0.09 percent of P, 0.05 to 0.2 percent of Ni, 0.3 to 0.5 percent of Cu, 0.03 to 0.04 percent of Nb, 0.2 to 0.4 percent of Mo, 0.002 to 0.005 percent of B, less than 0.08 percent of Al, less than or equal to 0.06 percent of Cr and the balance of Fe; and the tissue is granular bainite. The preparation method comprises the following steps of: smelting molten steel with vacuum and casting the molten steel to form ingots, roughly rolling the ingots in an austenite recrystallization area after soaking treatment, then finely rolling the ingots in an austenite non-recrystallization area, cooling the rolled ingots to between 450 and 500 DEG C with water after rolling, and cooling the rolled ingots in the air to room temperature. The seawater corrosion resistant ultra-low carbon bainite steel has good comprehensive mechanical property, low raw material cost, simple production process and good seawater corrosion resistance based on excellent mechanical property and welding property.

Description

technical field [0001] The invention relates to corrosion-resistant steel and a preparation method thereof, in particular to a seawater corrosion-resistant ultra-low carbon bainite steel and a preparation method thereof. Background technique [0002] With the development of the sea and coastal economy, it is required for steel structures to have high strength, high and low temperature toughness, high weldability and other excellent comprehensive properties for cross-sea bridges, ships, offshore oil drilling platforms and other fields. Ultra-low carbon bainite Steel is an ideal material capable of meeting such mechanical performance requirements. However, the application environment of these steel structures is long-term exposure to the coastal atmosphere or seawater containing chloride ions. The erosion of corrosive media seriously threatens the safety and service life of the steel structures. Usually, painting or cathodic protection measures are taken to prevent them. Haza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/12B21B37/74
Inventor 崔文芳张思勋董杰刘春明任海鹏王慧玉韩文习
Owner NORTHEASTERN UNIV
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