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Ultra-high strength dual phase steels with excellent cryogenic temperature toughness

A temperature range, steel plate technology, applied in the field of ultra-high strength, weldable, low alloy, dual-phase steel plate, can solve hydrogen-induced cracking and other problems

Inactive Publication Date: 2001-08-01
EXXONMOBIL UPSTREAM RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem encountered with standard commercial HSLA steels is hydrogen induced cracking at the HAZ, especially when welding with low heat input

Method used

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  • Ultra-high strength dual phase steels with excellent cryogenic temperature toughness
  • Ultra-high strength dual phase steels with excellent cryogenic temperature toughness
  • Ultra-high strength dual phase steels with excellent cryogenic temperature toughness

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Embodiment Construction

[0019] The present invention relates to the development of a new type of HSLA steel meeting the above requirements by producing a dual phase structure with ultrafine grains. Such a two-phase composite microstructure is preferably composed of a soft ferrite phase and a high-strength second phase in the form of fine-grained lath martensite, fine-grained lower bainite bodies, or their mixtures. The basis of the present invention is to produce intrinsic toughening and microstructure toughening through a new combination of chemical composition and treatment method of steel, so as to reduce DBTT and improve toughness under the condition of high tensile strength. Intrinsic toughening is achieved by a proper balance of important alloying elements in the steel, which is described in detail in this specification. Toughening of the microstructure occurs by achieving a very fine equivalent grain size and producing a very finely dispersed reinforcing phase while reducing the equivalent gr...

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Abstract

An ultra-high strength, weldable, low alloy, dual phase steel with excellent cryogenic temperature toughness in the base plate and in the heat affected zone (HAZ) when welded, having a tensile strength greater than 830 MPa (120 Ksi) and a microstructure comprising a ferrite phase (14) and a second phase of predominantly fine grain lath martensite and fine grain lower bainite (16), is prepared by heating a steel slab comprising iron and specified weight percentages of some or all of the additives, carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon, niobium, vanadium, titanium, aluminum and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; further reducing the plate in one or more passes in a temperature range below the austenite recrystallization temperature and above the Ar3 transformation temperature; finish rolling the plate between the Ar3 transformation temperature and the Arl transformation temperature; quenching the finish rolled plate to a suitable Quench Stop Temperature (QST); and stopping the quenching.

Description

field of invention [0001] The present invention relates to ultra high strength, weldable, low alloy, dual phase steel plates having excellent low temperature toughness in both the base plate and the heat affected zone (HAZ) when welded. Furthermore, the present invention relates to a method for producing the steel sheet. Background of the invention [0002] A number of terms are defined in the description that follows. For convenience, a glossary is given directly in front of the claims. [0003] Frequently, it is desirable to store and transport pressurized volatile fluids at cryogenic temperatures, ie, temperatures below about -40°C (-40°F). For example, pressurized liquefied liquids need to be stored and transported at pressures ranging from about 1035 kPa (150 psia) to 7590 kPa (1100 psia) and at temperatures ranging from about -123°C (-190°F) to -62°C (-80°F). Containers for natural gas (PLNG). There is also a need for containers that safely and economically store a...

Claims

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Application Information

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IPC IPC(8): C21D1/02C21D1/19C21D8/02C22C38/00C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/58
CPCC22C38/14C21D2211/008C22C38/06C21D8/0226C21D1/19C22C38/12C22C38/04C21D2211/005C22C38/08C22C38/001C21D2211/002C21D1/02C21D8/02
Inventor 具滋荣N-R·V·班加鲁
Owner EXXONMOBIL UPSTREAM RES CO
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