Seawater corrosion-resistant steel and manufacturing method thereof

A manufacturing method and seawater-resistant technology, applied in the field of corrosion-resistant steel and its manufacturing

Active Publication Date: 2020-06-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the technical solution disclosed in this patent document, it involves the use of Cr-Al combination to achieve seawater corrosion resistance. However, the highest yield strength level involved in this technical solution is only 390MPa

Method used

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  • Seawater corrosion-resistant steel and manufacturing method thereof
  • Seawater corrosion-resistant steel and manufacturing method thereof
  • Seawater corrosion-resistant steel and manufacturing method thereof

Examples

Experimental program
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Embodiment 1-6

[0052] Table 1 lists the mass percentage (wt%) of each chemical element in the seawater corrosion-resistant steel of Examples 1-6. Table 1. (wt%, the balance is Fe and other inevitable impurity elements except P, S and N)

[0053]

[0054]

[0055] As can be seen from Table 1, compared with the prior art, each embodiment of this case does not adopt the Cu-Cr-Mo composition system in the prior art, and there is no higher content of P, S, C and Si. The design of Cr-Al-Mo composition system is adopted, and the corrosion resistance of seawater is improved through the addition of Cr and Al alloy elements, and the occurrence of pitting corrosion is suppressed by adding Mo, and the high content of Cr is eliminated to inhibit corrosion in seawater environment. "Reverse" effect, thereby further improving seawater corrosion resistance.

[0056] The manufacturing method of the seawater corrosion-resistant steel of embodiment 1-6 adopts the following steps to make:

[0057] (1) Smel...

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Abstract

The invention discloses seawater corrosion-resistant steel. The seawater corrosion-resistant steel comprises the following chemical elements in percent by mass: 0.03-0.05% of C, 0.04-0.08% of Si, 0.8-1.2% of Mn, 0.1-0.2% of Cu, 2.5-5.5% of Cr, 0.05-0.15% of Ni, 0.15-0.35% of Mo, 1.5-3.5% of Al, 0.01-0.02% of Ti, 0.0015-0.003% of Ca and the balance Fe and other inevitable impurities. In addition, the invention further discloses a manufacturing method of the seawater corrosion-resistant steel. The manufacturing method comprises the following steps of (1) smelting and casting; (2) reheating: reheating a casting blank to 1200-1260 DEG C; (3) rough rolling; (4) finish rolling; (5) coiling; and (6) carrying out cooling on the casting blank to room temperature. The seawater corrosion-resistant steel has good seawater corrosion resistance and excellent mechanical properties.

Description

technical field [0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a corrosion-resistant steel grade and a manufacturing method thereof. Background technique [0002] Corrosion-resistant steel is based on ordinary carbon steel by selectively adding appropriate Cu, P, Cr, Ni, Mo, Al, Ca, Mg, Sb and other alloying elements to improve its corrosion resistance. According to the use environment, it can be divided into atmospheric corrosion-resistant steel, seawater corrosion-resistant steel and acid-resistant steel, among which atmospheric corrosion-resistant steel is also called weathering steel. Corrosion-resistant steel can effectively prolong the service life of steel structures, thereby reducing the cost of use and the pressure on the environment, so it is widely used in many fields. [0003] However, in the prior art, corrosion-resistant steels are mainly focused on atmospheric corrosion resistance, and little is known about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/002C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D8/02C22C33/08C21D2211/002C21D2211/005
Inventor 温东辉宋凤明杨阿娜王炜李自刚周庆军缪乐德
Owner BAOSHAN IRON & STEEL CO LTD
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