G-TECH 25.35.4CNb

Designed to complement heat-resistant cast alloys with 0.4%C-25%Cr-35%Ni-Nb, these consumables also cater to micro-alloyed variants with Ti for enhanced creep resistance. They extend their applicability to Nb-free alloys and leaner high-carbon Cr-Ni alloys like HK40, HT40, and IN519, where overmatching weld metal is typically acceptable. Notably, Alloy HP40Nb exhibits resistance to sigma phase embrittlement, and its composition, featuring eutectic and secondary carbides, ensures remarkable hot strength and creep resistance within the common service temperature range of 900-1100°C. The elevated levels of Cr and Ni contribute to robust resistance against oxidation and carburization. Primary applications revolve around pyrolysis coils and reformer tubes essential for ethylene production in the petrochemical sector. Remarkably, these consumables generally do not necessitate preheating.