Corrosion resistant alloy weldments in carbon steel structures and pipelines to accommodate high axial plastic strains
First Claim
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1. A method of constructing a pipeline for transporting hydrocarbons, comprising:
- developing a strain-based design for the pipeline based on predicted loads on the pipeline;
predicting global plastic strains on the pipeline based on the strain-based design;
selecting a tubing material having primarily ferritic properties and a weld material having primarily austenitic properties to form a weld joint based on the predicted global plastic strains;
providing two sections of tubing made of the tubing material;
joining the two sections of tubing with the weld material to form the weld joint; and
using the weld joint and the two sections of tubing to transport hydrocarbons.
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Abstract
A method and apparatus for joining materials having primarily ferritic properties is described. The method includes joining the ferritic materials using a welding process and a weld material having a primarily austenitic microstructure. The resulting weldment enhances the properties of yield ratio, uniform elongation, toughness and tearing resistance thereby producing superior strain capacity. High strain capacity produces a structure that accommodates high axial loading. The weldment can also accommodate larger than conventional weld flaws while maintaining sufficient strength, tearing resistance, and fracture toughness under high axial loading.
97 Citations
43 Claims
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1. A method of constructing a pipeline for transporting hydrocarbons, comprising:
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developing a strain-based design for the pipeline based on predicted loads on the pipeline; predicting global plastic strains on the pipeline based on the strain-based design; selecting a tubing material having primarily ferritic properties and a weld material having primarily austenitic properties to form a weld joint based on the predicted global plastic strains; providing two sections of tubing made of the tubing material; joining the two sections of tubing with the weld material to form the weld joint; and using the weld joint and the two sections of tubing to transport hydrocarbons. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 20, 21, 22, 23, 24)
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13. A method of forming a weld joint between tubular sections, comprising:
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developing a strain-based design based on predicted loads on the weld joint; selecting a tubing material for the tubular sections having primarily ferritic properties and a weld material having primarily austenitic properties and a yield strength to tensile strength ratio that is less than 0.75 to form the weld joint based on the predicted loads of the strain-based design; and joining ends of the tubular sections with a welding process using the primarily austenitic weld material. - View Dependent Claims (14, 15, 16, 17, 18, 19, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for designing a strain-based pipeline for transporting hydrocarbons, comprising:
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developing a strain-based design for the pipeline based on predicted loads on the pipeline; predicting global plastic strains on the pipeline based on the strain-based design; selecting a tubing material having primarily ferritic properties and a weld material having primarily austenitic properties to form a weld joint based on the predicted global plastic strains; and joining two sections of tubing comprising the tubing material with the weld material to form the weld joint and form at least a portion of the strain-based pipeline. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification