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

A carbon bainitic steel, seawater-resistant technology, applied in temperature control and other directions, can solve the problems of high preparation cost and poor comprehensive performance of seawater-resistant steel, and achieve low raw material cost, excellent mechanical properties and weldability, Simple production process

Active Publication Date: 2011-12-07
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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] The ingredients are 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 yield strength of the aforementioned low-carbon bainite steel is 540MPa, the tensile strength is 690MPa, the elongation after fracture is 32%, the reduction of area is 69.4%, the room temperature longitudinal impact energy is 140.1J, and the -40℃ longitudinal impact energy is 127.8J. .

[0033] The aforementioned low carbon bainite steel has a welding cold crack sensitivity coefficient of 0.15 and a weather resistance index of 6.29 to 6.95.

[0034] The preparation method is as follows: smelt molten steel according to the above composition and pour it into an ingot, heat the ingot to 1200°C for 3 hours and perform two-stage rolling after soaking, and the rough rolling opening temperature in the austenite recrystallization zone is 1100°C , The final rolling temperature of roug...

Embodiment 2

[0039] The ingredients are C 0.03%, Mn 1.14%, S 0.005%, Si 0.28%, P 0.09%, Ni 0.15%, Cu 0.3%, Nb 0.036%, Mo 0.22%, B 0.0038%, Al 0.067% by weight, Cr 0.06%, the balance is Fe, and the structure is bainite.

[0040] The yield strength of the aforementioned low-carbon bainite steel is 575MPa, the tensile strength is 720 MPa, the elongation after fracture is 32.8%, the reduction of area is 70.0%, the room temperature longitudinal impact energy is 134.6J, and the -40℃ longitudinal impact energy is 97.8 J.

[0041] The aforementioned low-carbon bainite steel has a welding cold crack sensitivity coefficient of 0.15 and a weather resistance index of 6.95.

[0042] The preparation method is as follows: smelt molten steel according to the above composition and pour it into ingots, heat the ingots to 1230℃ soaking for 2.5 hours and then carry out two-stage rolling. Among them, the rough rolling opening temperature in the austenite recrystallization zone is 1130 ℃, the finishing temperature o...

Embodiment 3

[0045] The components are C 0.02%, Mn 1.05%, S 0.004%, Si 0.40%, P 0.08%, Ni 0.05%, Cu 0.4%, Nb 0.03%, Mo 0.31%, B 0.0022%, Al 0.071% by weight percentage, Cr 0.05%, the balance is Fe, and the structure is bainite.

[0046] The yield strength of the low-carbon bainitic steel is 563MPa, the tensile strength is 705MPa, the elongation after fracture is 32.5%, the reduction of area is 73%, the room temperature longitudinal impact energy is 131J, and the -40°C longitudinal impact energy is 101.3J.

[0047] The aforementioned 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: smelting molten steel according to the above composition and pouring into an ingot, heating the ingot to 1220℃ soaking for 2h, and then performing two-stage rolling. Among them, the rough rolling opening temperature in the austenite recrystallization zone is 1110℃ , The final rolling temperature of rough rolling...

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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 0.04percent 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 belongs 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 offshore and coastal economy, steel structures used in cross-sea bridges, ships, offshore oil drilling platforms and other fields require excellent comprehensive properties such as high strength, high and low temperature toughness, high weldability, and ultra-low carbon bainite. Steel is an ideal material that can meet this demand for mechanical properties. However, the application environment of these steel structures is long-term exposure to the coastal atmosphere or seawater containing chloride ions. The corrosion of corrosive media makes the safety and service life of steel structures seriously threatened. Painting or cathodic protection measures are usually taken to prevent them. The harm of sea water or...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING