Structural steel for polar ice-breaking transport ship and its manufacturing method

Abstract

The invention discloses structural steel for a polar-region icebreaking transport ship and a preparation method of the structural steel. The structural steel is characterized by comprising the following chemical ingredients by weight percent: 0.11-0.25% of carbon, 0.61-1.25% of silicon, 0.10-0.39% of manganese, less than or equal to 0.008% of phosphorus, less than or equal to 0.001% of sulfur, 0.35-0.89% of chromium, 0.11-0.20% of titanium, less than or equal to 0.003% of nitrogen, and the balance of iron and inevitable impurities. The yield strength of the structural steel is more than or equal to 500 MPa, the cold brittleness transition temperature is lower than or equal to minus 70 DEG C, the comprehensive performances of the constructed polar-region icebreaking transport ship are excellent, the voyage is shortened, the safety is high, the defects in the prior art that a low temperature ship cannot break ice and the icebreaking ship does not have the capability of transporting large cargos are overcome, and the structural steel is of great significance for the domestic ocean shipping in the north pole.

Description

technical field [0001] The invention belongs to the field of high-strength steel manufacturing for ships, and in particular relates to a structural steel for polar ice-breaking transport ships and a manufacturing method. Background technique [0002] The Antarctic and Arctic regions are rich in resources, and low-temperature ships are needed to mine and transport these resources. The ocean voyage from my country to Northwest Europe and North American countries via the Arctic waterway is about 15 days shorter than the voyage via the Gulf of Aden. Moreover, it is safer to transport liquefied natural gas through the Arctic low-temperature waterway than the equatorial seaway, and the benefits are significant. In addition to the low ambient temperature, ships in polar waterways are also affected by the impact of ice blocks, waves, and hurricane damage. Therefore, steel for ship structure is required to have high strength with yield strength ≥ 500MPa and low temperature toughness...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of steel for the polar ice-breaking transport ship structure and its manufacturing method, which overcomes the defects in the prior art that the low-temperature ship cannot break the ice, and the ice-breaking ship does not have the capacity to transport large cargo

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