The influence of Mn and Cr on the formation of surface oxides and their entrapment during electric resistance welding of Si containing low carbon steels was studied using thermodynamic calculations and experimental investigation of the microstructure of the different oxide inclusions within welds on electric resistance welding-fabricated pipes. The process of oxidation during the welding process, its dependence on oxygen content, temperature of oxidation and the composition of ferrite within the parent steel were analysed. It was shown that the most important influence on the type of oxide inclusions formed during welding is the Mn/Si ratio, while Cr has an indirect influence via carbide formation, which increases the relative content of Mn in ferrite.
BucklandB.: ‘An introduction into the production and specification of steel pipe’, Piledriver, 2005, Q1, 20–26.
2.
WatanabeS., OdeF., KanoN., YokoyamaE. and HiranoY.: ‘Recent progress in techniques of manufacturing small diameter electric resistance weld tubes’4, ‘Kawasaki Steel Technical Report’, 84–96; 1981.
3.
BabuS. S., DavidS. A., VitekJ. M., MundraK. and DebRoyT.: ‘Development of macro- and microstructures of carbon–manganese low alloy steel welds: inclusion formation’, Mater. Sci. Technol., 1995, 11, 186–199. doi: 10.1179/mst.1995.11.2.186
4.
GrongO., SiewertT. A., MartinsG. P. and OlsonD. L.: ‘A model for the silicon–manganese deoxidation of steel weld metals’, Metall. Trans. A, 1986, A17, 1797–1807. doi: 10.1007/BF02817277
5.
HsiehK. C., BabuS. S., VitekJ. M. and DavidS. A.: ‘Calculation of inclusion formation in low-alloy-steel welds’, Mater. Sci. Eng. A, 1996, A215, 84–91. doi: 10.1016/0921-5093(96)10370-1
6.
RamirezJ. E.: ‘Characterization of high-strength steel weld metals: chemical composition, microstructure, and nonmetallic inclusions, Weld’, Res., 2008, 87, (3), 65–75.
7.
BhadeshiaH. K. D. H. and SvenssonL. E.: ‘Mathematical modelling of weld phenomena’, (ed. CerjakH. and EasterlingK. E.., 109–178; 1993, London, The Institute of Materials.
8.
DaviesR. H., DinsdaleA. T., GisbyJ. A., RobinsonJ. A. J. and MartinS. M.: ‘MTDATA—thermodynamic and phase equilibrium software from the National Physical Laboratory’, Calphad, 2002, 26, 229–271. doi: 10.1016/S0364-5916(02)00036-6
9.
SellebyM.: ‘An assessment of the Fe–O–Si system’, Metall. Mater. Trans. B, 1997, 28B, 563. doi: 10.1007/s11663-997-0029-z
10.
KjellqvistL. and SellebyM.: ‘Thermodynamic assessment of the Cr–Mn–O system’, J. Alloys Compd., 2010, 507, 84–92. doi: 10.1016/j.jallcom.2010.04.252
11.
BuntingE. N.: ‘Phase equilibria in the system Cr2O3–SiO2’, Bur. Stand. J. Res., 1930, 5, (2), 325–327. doi: 10.6028/jres.005.021
12.
EguchiM., UchidaR. and ChibaM.: ‘Study of the fixing of chromium with iron–silicate slag (I) phase equilibria of the FeO–Cr2O3–SiO2 system in contact with metallic iron’, Bull. Res. Inst. Miner. Dressing Metall., Tohoku Univ., 1977, 33, (1), 24–30.
13.
ChenS., JakE. and HayesP. C.: ‘Effect of Al2O3 and Cr2O3 on liquidus temperatures in the cristobalite and tridymite primary phase fields of the MgO–“FeO”–SiO2 system in equilibrium with metallic iron’, ISIJ Int., 2005, 45, (6), 798–806. doi: 10.2355/isijinternational.45.798
14.
BesmannT. M., KulkarniN. S. and SpearK. E.: ‘Thermochemical analysis and modeling of the Al2O3–Cr2O3, Cr2O3–SiO2, and Al2O3–Cr2O3–SiO2 systems relevant to refractories’, J. Am. Ceram. Soc., 2006, 89, (2), 638–644. doi: 10.1111/j.1551-2916.2005.00719.x
15.
KondratievA., JakE. and HayesP. C.: ‘Predicting slag viscosities in metallurgical systems’, JOM, 2002, 54, 41–45. doi: 10.1007/BF02709749
WrightS., ZhangL., SunS. and JahanshahiS.: ‘Viscosity of a CaO–MgO–Al2O3–SiO2 melt containing spinel particles at 1646 K’, Metall. Mater. Trans. B, 2000, 31B, 97–104. doi: 10.1007/s11663-000-0134-8
