Cross-Weld Creep Properties of Advanced 9% Cr Steels

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Back to Core Research Programme AMorph – 4D Printing for Field Morphing Structures Automation of Composite and Hybrid Joining Process Coaxial Wire Additive Manufacturing Processes and In-Line Monitoring Tools Development of Coded Excitation Technique for Non-Metallic Pipes Inspection Development of Digital Twin technology as a demonstrator for real-time integrity assessment of crack growth in tensile specimens Development of Friction Stir Welding (FSW) for Hydrogen Fuel Storage Tanks Development of Leak-Before-Break Hydrogen Storage Composite Pressure Vessels With Polymeric Liner Establishing Assessment Methods for Determining Safe Service Limits of High-Temperature Materials in Extreme Environments Fracture toughness in aggressive environments: effect of crack monitoring techniques on test results In-process detection and non-destructive testing of electron beam weld imperfections Internal Bore Coatings for Applications in Corrosion and Hydrogen Environment Joining of Additively Manufactured Materials Long term behaviour of polymeric liner materials/coatings in hydrogen service Techniques for High Temperature Ultrasonic Inspection of Arc Welding Ultimate Leverage Fund

Project Code: 0902-06

Objectives

Demonstrate that some of the newer welding technologies yield benefits in terms of increased productivity and improved cross-weld creep performance, compared with existing welding processes for 9%Cr steels.

By means of cross-weld creep testing, to demonstrate that new high Cr steels show little or no diminution of creep strength in the HAZ.

Project Outline

A programme of evaluation of the effects of welding process (the new variant technologies) on existing grade 91 steel and of the new emerging steels will be carried out, and their productivity compared. Butt welds will be deposited in each of the steels, and weld metal mechanical properties, including cross-weld creep rupture testing will be carried out.

The detailed metallurgical investigation will be carried out to gain an understanding of the microstructural changes occurring in the HAZ, and the reasons for the anticipated good HAZ creep rupture strength.

Relevant Industry Sectors

Power, Oil, Gas and Chemicals

Technical and Economic Benefits

Confidence in one or more improved alternatives to grade 91 steels that are currently widely used, but which require constant monitoring and often weldment repair well within the design life.

Carrying out welding, toughness, creep and hot corrosion tests will help demonstrate our facilities to the international community, and may lead to collaborative or single client work.

An increased understanding of the productivity and weld quality implications of using the new welding process, with an anticipated improvement in productivity and weld quality.

Industrial Member Report

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Review of Type IV Cracking in 9-12%Cr Creep Strength Enhanced Ferritic Steels