PSI - Issue 42

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Tadeu Messias Donizete Borba et al. / Procedia Structural Integrity 42 (2022) 276–283 Tadeu Messias Donizete Borba / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 1. Chemical composition, EBSD and mechanical properties results of API X80MO. Chemical composition (% w/w) C Mn Si P 0.06 1.71 0.26 <0.010 S N Nb+V+Ti <0.001 <0.0045 0.049 Mo+Ni Cu+Cr Ceq a Pcm b 0,50 0,35 0.42 0.19 EBSD Frequency misorientation angle(°) ≤5° ≤15° >15° >45° 32% 61% 39% 27% Effective ferritic grain size 2.1±0.2µm (misorientation angle≥15°) Mechanical properties Yp c UTS d 569 ± 10 MPa 671 ± 10 MPa El e ChV f 59 ± 1 % 349 ± 9 J a Ceq = C + Mn/6 + (Ni + Cu)/15 + (Cr + Mo + V)/5; b Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B c Yp: yield strength; d UTS: ultimate tensile strength; e El: elongation f ChV: Charpy impact energy (-30 °C) Table 2. Typical all weld metal chemical compositions and mechanical properties - FCAW and SAW processes (without dilution, information from ESAB catalogue(2018)). FCAW FCAW – ESAB Classification Wire Diameter Dual Shield 55 AWS A5.29:E91T1-Ni1M 1.2 mm Chemical compositions - FCAW – As Welded C Si Mn Ni 0.05 0.41 1.45 0.95 Mechanical Properties – FCAW - AsWelded Yp a UTS b El c ChV d (-40 °C) CTOD (-10 °C) 604 MPa 663 MPa 27% 106 J 0.78 mm SAW SAW - ESAB Classification Wire Diameter OK Autrod 13.40 & OK Flux 10.62 AWS A5.23 F10A8-EG-F3 and AWS A5.23 F9P8-EG-F3 4.0 mm Chemical compositions - SAW - AsWelded C Si Mn Ni 0.07 0.26 1.50 0.90 Mechanical Properties - SAW – As Welded Yp a UTS b El c ChV d (-40°C) CTOD (-10 °C) 610 MPa 690 MPa 24% 80 J --- a Yp: yield strength; b UTS: ultimate tensile strength; c El: elongation d ChV: Charpy impact energy (-40 °C)

Table 3. Welding parameters used and groove configuration (nominal values). FCAW Conditions

Groove Geometry

Current (A)

Voltage (V)

Welding Speed (mm/min)

Heat Input (kJ/mm)

230

350

0.82

N° Layers

N° Pass

Position

Polarity

Flat

CC+

Gas / Flow rate (l/min): C25 / 18 SAW Conditions