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Use of anisotropy to increase strain capacity performance of pipelines

IP.com Disclosure Number: IPCOM000202170D
Publication Date: 2010-Dec-07
Document File: 1 page(s) / 31K

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Abstract

Techniques aimed at improving strain capacity of pipelines through introduction of anisotropy in the steel material are discussed

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Abstract

Techniques aimed at improving strain capacity of pipelines through introduction of anisotropy in the steel material are discussed

Use of anisotropy to increase strain capacity performance of pipelines

Technical Memorandum, 18 June 2010

High strength steels allow reduction of pipeline section, but exhibit poor strain capacity. As a result, the use of high strength steels in regions governed by strain based design is particularly challenging. A series of techniques aimed at introducing anisotropy in the steel in order to obtain a material with both high strength capacity in the hoop direction and high strain capacity in the axial direction.

Description of techniques

Technique 1: Alter structure during solidification

a) Alter chemistry to promote formation of plate or needle-like inclusions (e.g. borides, nitrides, intermetallic phases) that would be aligned during the rolling process and create a bias in the grain growth or phase transformation, or to provide oriented barriers to deformation.

b) Control grain growth through the use of thermal gradients during slab solidification that would tailor plate anisotropy through a preferred crystallographic orientation.

c) Orientation of the grains through the use of a magnetic field.

Technique 2: Introduce texture in the steel by changing the orientation of the material grains during rolling process.

Technique 3: Make use of strain hardening during the cold expansion phase of the U-O-E process.

Plastic deformation of the pipe can be controlled as to incr...