ISSN 2594-5327
77º Congresso Anual da ABM - Internacional — vol. 77, num.77 (2024)
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FOR HIGH-CAPACITY NATURAL GAS TRANSMISSION PIPELINES, BESIDES HAVING HIGH YIELD AND TENSILE STRENGTH, THE STEELS MUST PRESENT HIGH TOUGHNESS AND HIGH CAPACITY TO ARREST ANY CRACK, PROVIDING SAFETY TO THE PIPELINE DURING ITS ENTIRE LIFE. THE OBJECTIVE OF THIS PAPER IS TO PRESENT THE CHARACTERIZATION OF THE GIRTH WELD HAZ OF SAMPLES FROM CHEYENNE PLAINS PIPE, AN API X80 STEEL WITH EXCELLENT COMBINATION OF HIGH STRENGTH WITH TOUGHNESS. SPECIAL ATTENTION WAS GIVEN TO THE MA PHASE AT HAZ OF A GIRTH WELD MADE USING GMAW PROCESS. THIS STEEL ADOPTED THE MODERN ALLOY DESIGN WITH CARBON CONTENT BELOW 0.05%, THAT ALLOWS TO USE UP TO 0.08% TO 0.10%NB. IT WAS CONCLUDED THAT THE HIGH TOUGHNESS OF THE GIRTH WELD IS THE COMBINATION OF THIS MODERN ALLOY DESIGN WITH GMAW WELDING PROCESSES, A LOW HEAT INPUT WELDING PROCESS, RESULTING IN: - FINE PRIOR AUSTENITIC GRAINS AT HAZ, WITH LESS THAN 1.5% OF MA PHASE AND A MAXIMUM EQUIVALENT DIAMETER OF 2.5µM, THAT WAS FORMED DURING WELDING COOLING OR AT HEATING CYCLE DURING MULTI WELDING PASSES. - FAST COOLING AT WELDING CYCLE DUE TO THE LOW HEAT INPUT, PROMOTING THE FORMATION OF LOW TEMPERATURE BAINITE. NIOBIUM IN SOLUTION CAN HELP PROMOTE THE FORMATION OF LOW TEMPERATURE BAINITE AS WELL. PREVENTING EXCESSIVE AUSTENITIC GRAIN GROWTH DURING WELD THERMAL CYCLE, LOW MA PHASE FRACTION AND LOW TEMPERATURE BAINITE ARE THE BASIS FOR MAINTAINING HIGH TOUGHNESS AT HAZ OF GIRTH WELD.
FOR HIGH-CAPACITY NATURAL GAS TRANSMISSION PIPELINES, BESIDES HAVING HIGH YIELD AND TENSILE STRENGTH, THE STEELS MUST PRESENT HIGH TOUGHNESS AND HIGH CAPACITY TO ARREST ANY CRACK, PROVIDING SAFETY TO THE PIPELINE DURING ITS ENTIRE LIFE. THE OBJECTIVE OF THIS PAPER IS TO PRESENT THE CHARACTERIZATION OF THE GIRTH WELD HAZ OF SAMPLES FROM CHEYENNE PLAINS PIPE, AN API X80 STEEL WITH EXCELLENT COMBINATION OF HIGH STRENGTH WITH TOUGHNESS. SPECIAL ATTENTION WAS GIVEN TO THE MA PHASE AT HAZ OF A GIRTH WELD MADE USING GMAW PROCESS. THIS STEEL ADOPTED THE MODERN ALLOY DESIGN WITH CARBON CONTENT BELOW 0.05%, THAT ALLOWS TO USE UP TO 0.08% TO 0.10%NB. IT WAS CONCLUDED THAT THE HIGH TOUGHNESS OF THE GIRTH WELD IS THE COMBINATION OF THIS MODERN ALLOY DESIGN WITH GMAW WELDING PROCESSES, A LOW HEAT INPUT WELDING PROCESS, RESULTING IN: - FINE PRIOR AUSTENITIC GRAINS AT HAZ, WITH LESS THAN 1.5% OF MA PHASE AND A MAXIMUM EQUIVALENT DIAMETER OF 2.5µM, THAT WAS FORMED DURING WELDING COOLING OR AT HEATING CYCLE DURING MULTI WELDING PASSES. - FAST COOLING AT WELDING CYCLE DUE TO THE LOW HEAT INPUT, PROMOTING THE FORMATION OF LOW TEMPERATURE BAINITE. NIOBIUM IN SOLUTION CAN HELP PROMOTE THE FORMATION OF LOW TEMPERATURE BAINITE AS WELL. PREVENTING EXCESSIVE AUSTENITIC GRAIN GROWTH DURING WELD THERMAL CYCLE, LOW MA PHASE FRACTION AND LOW TEMPERATURE BAINITE ARE THE BASIS FOR MAINTAINING HIGH TOUGHNESS AT HAZ OF GIRTH WELD.
Palavras-chave
Niobium, Microalloyed steels, pipeline steel, girth weld, Toughness, MA phase
Niobium; Microalloyed steels; Pipeline steel; Girth weld.
Como citar
NOGUEIRA, MARCOS ALEXANDRE STUART;
HADDAD, PAULO DE TARSO;
KIZU, TARO;
ENDO, SHIGERU.
MODERN PIPELINE STEEL ALLOY DESIGN PREVENTING FROM MA PHASE
,
p. 617-627.
In: 77º Congresso Anual da ABM - Internacional,
São Paulo, Brasil,
2024.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-40550
