Analysis of the Influence of Welding Parameters on Microstructures and Mechanical Properties of Welding Joints of an API X70Q Steel Tube for the Sour Service Application

Paula, Mariana Pessoa Medeiros de; Modenesi, Paulo José; Trindade, Vicente Braz

doi:10.1590/0104-9224/SI2302.06

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Artigos Técnicos • Soldag. insp. 23 (2) • Apr-Jun 2018 • https://doi.org/10.1590/0104-9224/SI2302.06 copy

Analysis of the Influence of Welding Parameters on Microstructures and Mechanical Properties of Welding Joints of an API X70Q Steel Tube for the Sour Service Application

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The X70 steel is a material that has a good relation between mechanical strength and toughness, being very used in conduction and transport of oil and gas. With the objective to evaluate the weldability, the microstructural and mechanical characteristics were evaluated along the cross section of joints obtained by GTAW (root) and GMAW (filling) processes of API 5L X70QS seamless steel pipes. The pipe segments machined in J bevel, welded with circumferential rotation to maintain flat welding position with three different heat inputs. Test specimens for tensile tests, Vickers hardness, Charpy impact and chemical analysis, besides metallographic characterization was made for base material and welded joints. The grade X70QS obtained and welded with different heat inputs showed excellent mechanical behavior and particularly low HAZ hardness.

Key-words:
seamless pipe; steel API 5L X70QS; GMAW; GTAW; heat imput

%	C	Mn	Si	P	S	Cu	B	Cr+Mo	Nb+V+Ti	CE_IIW	CE_PCM
Mínimo	0,05	1,35	0,25	-	-	-	-	-	-	0,344	0,168
Máximo	0,08	1,42	0,35	0,010	0,03	0,04	0,005	0,20	0,07	0,373	0,191

		Processo	Consumível	Ø (mm)	Corrente (A)	Tensão (V)	Aporte (kJ/mm)
APT-B	1° passe raiz	GTAW	ER70S-3	2,4	104 ± 4	10,5 ± 0,50	1,12
	2° ao 4° passe de raiz	GTAW	ER70S-3	2,4 e 3,2	151 ± 1	11,5 ± 0,50	1,68±0,25
	Enchimento	GMAW	ER80S-D2	1,2	190 ± 13	23,5 ± 1,50	0,68±0,02
	Acabamento	GMAW	ER80S-D2	1,2	190 ± 10	22,5 ± 0,50	0,69±0,03
APT-M	1° passe raiz	GTAW	ER70S-3	2,4	110 ± 8	10,5 ± 0,50	1,02
	2° ao 4° passe de raiz	GTAW	ER70S-3	2,4 e 3,2	158 ± 13	12,5 ± 0,50	1,95±0,04
	Enchimento	GMAW	ER80S-D2	1,2	187 ± 15	25,0 ± 1,00	1,03±0,10
	Acabamento	GMAW	ER80S-D2	1,2	196 ± 15	24,5 ± 0,50	0,92±0,02
APT-A	1° passe raiz	GTAW	ER70S-3	2,4	95 ± 5	10,5 ± 0,50	1,13
	2° ao 4° passe de raiz	GTAW	ER70S-3	2,4 e 3,2	175 ± 25	11,5 ± 0,50	1,70±0,22
	Enchimento	GMAW	ER80S-D2	1,2	290 ± 10	26,5 ± 0,50	1,41±0,02
	Acabamento	GMAW	ER80S-D2	1,2	290 ± 10	26,5 ± 0,50	1,40±0,01

%	C	Si		Mn		Cr		Ni	Mo		Cu
APT-B	0,083	0,621		1,627		0,088		0,043	0,432		0,118
APT-M	0,083	0,630		1,651		0,089		0,044	0,433		0,123
APT-A	0,083	0,643		1,651		0,083		0,040	0,382		0,113
%	P		S		B		V	CE_IIW		CE_PCM
APT-B	0,012		0,0118		0,0004		0,006	0,421		0,207
APT-M	0,012		0,0119		0,0003		0,006	0,401		0,197
APT-A	0,013		0,0119		0,0004		0,006	0,401		0,201

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[1] E-mails: marianapessoa200@hotmail.com (MPMP), modenesi@demet.ufmg.br (PJM), vicentebraz@yahoo.com.br (VBT)