Advanced Steel Metallurgy: Plate, Pipe & Tube
Program Organizers: Chirag Mahimkar, Big River Steel; Justin Raines, SSAB Americas; Kip Findley, Colorado School of Mines; Alla Sergueeva, NanoSteel Company Inc; Daniel Branagan, The NanoSteel Co
Monday 2:00 PM
November 2, 2020
Room: Virtual Meeting Room 39
Location: MS&T Virtual
2:00 PM Cancelled
Parametric study of cold wire tandem submerged arc welding of heavy gauge X70 linepipe steel: Tailin Ren1; Hani Henein1; J Barry Wiskel1; Douglas Ivey1; Mohsen Mohammadijoo2; Robert Lazor3; 1University of Alberta; 2EVRAZ Inc. NA; 3TC Energy Corporation
Cold wire tandem submerged arc welding (CWTSAW) has been developed to improve the productivity (i.e., deposition rate and travel speed) of heavy gauge pipe welding and to control the weld and heat-affected zone (HAZ) geometry and mechanical properties. A series of CWTSAW trials were conducted on thick-wall API X70 steel plates to investigate the effect of cold wire feed speed (CWFS), heat input (HI) and bevel design (BD) on the resulting geometry (e.g., height of reinforcement area (HRA), bead toe angle (BTA) and coarse grain heat-affected zone (CGHAZ)) and micro-hardness of the weld and HAZ. The weld geometry parameters, prior austenite grain size (PAG) and fraction of martensite-austenite (MA) phase were measured using optical microscopy (OM). Vickers micro-hardness measurement were taken of the weld metal and across the HAZ. The geometry and hardness measurements were statistically correlated with the welding parameters using the Taguchi methodology. The results showed that the weld bevel design (BD) was the dominant factor influencing the HRA, CGHAZ area and BTA. Cold wire feed speed (CWFS) and heat input (HI) had a strong influence on the weld metal hardness and both the PAG and MA fraction in the CGHAZ.
2:20 PM Cancelled
A Predictive Tool to Aid the Design, Heat Treatment and Qualification of Pipeline Fittings: Fateh Fazeli1; Robert Cicoria2; James Saragosa1; Cindy Guan3; 1CanmetMATERIALS; 2McMaster University; 3TC Energy
Operators and regulators have identified instances where pipeline fittings failed to meet the specified properties. Substandard properties stem mainly from improper steel chemistries and inadequate heat treatment practices. As such, it is crucial to have a thorough understanding of the interplay between steel composition, production parameters, and final properties. A thermal-microstructure-strength software code has been developed that can be used as a predictive tool to aid the design, manufacturing and qualification of pipeline fittings. The software has been calibrated with plant-specific equipment data by temperature survey of different quench tanks and reheating furnaces with various load configurations. Further, key material data such as prior austenite grain growth kinetics, CCT diagram and tempering response have been determined and modelled for several fittings steels. The code was used to simulate the results of FAI (first article inspection) for several fittings geometries and grades and to generate microstructure, hardness and strength maps.