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Steel for low temperature and high tenacity structure use and its production method

A technology for structural steel and manufacturing methods, which is applied in the field of structural steel, can solve problems such as high cost and complicated processing technology, and achieve the effects of increasing manufacturing cost, reducing production cost, and shortening the manufacturing cycle

Inactive Publication Date: 2006-10-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

In short, the composition and processing technology of the existing low-temperature high-toughness structural steel are complex and costly

Method used

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  • Steel for low temperature and high tenacity structure use and its production method
  • Steel for low temperature and high tenacity structure use and its production method

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Experimental program
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Embodiment Construction

[0037] Examples see figure 1 ,Table 2.

[0038] The steel type designed by the present invention does not need to add elements such as above precious Ni, Cr or Mo, only needs to slightly increase very cheap Si (extremely cheap. Solid solution strengthening, reduces bainite transformation point, and makes bainite C The curve moves to the right, inhibits the decomposition of supercooled austenite, increases the volume fraction of retained austenite and stabilizes austenite, promotes the formation of carbon-rich austenite film between ferrite in bainite, and improves toughness), Mn (Cheap. Strongly reduce bainite point, weakly reduce martensite point, improve hardenability and strength) and trace amounts of Nb and Ti (Nb and Ti are microalloying elements, which can control the growth of grains by precipitation Large, improve strength) and other elements and a certain controlled rolling and controlled cooling process (TMCP), can meet the requirements of better strength and toughn...

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Abstract

The invention provides a low-temperature high ductility constructional steel, wherein the chemical constituents include (by weight percent): C 0.04-0.08, Si 0.60-0.80, Mn 1.65-2.15, Nb 0.055-0.075, Ti 0.010-0.020, AlT 0.025-0.045, P<=0.012, S<=0.003, O<=0.0015, N 0.008-0.012, balancing Fe and unavoidable foreign substance. The preparation method comprises the steps of smelting, refining, casting, billet reheating, rolling, fast cooling, and finishing.

Description

technical field [0001] The invention belongs to the field of structural steel, in particular to a low-temperature high-toughness structural steel and a manufacturing method thereof. Background technique [0002] As the demand for long-distance transportation such as petroleum gas and natural gas continues to increase, the manufacture of liquefaction devices and storage equipment requires more and more low-temperature-resistant, high-strength, and high-toughness steels. In addition to high strength (yield strength ≥ 390MPa), it must also have good low temperature toughness. According to general standards, the designed operating temperature is lower than -110°C, even reaching -165°C. [0003] Table 1 is the contrast of the present invention with the specific regulations of the Det Norske Veritas (DNV) ship classification specification to low temperature and ultra-low temperature ductile steel mechanical properties and design working temperature (not including NV9Ni steel, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D6/00C21D7/13
Inventor 王巍
Owner BAOSHAN IRON & STEEL CO LTD
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