HP40Nb

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.

Consumables to match 0.4%C-25%Cr-35%Ni-Nb heat resistant cast alloys.

In the as-welded condition the weld metal consists of austenite with eutectic and secondary carbide.

Also suitable for high carbon 18%Cr-37%Ni-Nb alloys e.g.W.-Nr 1.4849.
EN W.Nr.: 1.4857 (G-X40NiCrSi 35 25), 1.4853 (X 40 NiCrNb 35-25).
ASTM: A297 HP40Cb, A297 HP, A297 HP40.
PROPRIETARY: Paralloy H39W (Doncasters Paralloy), Lloyds T64 (LBA), MO-RE® 10, 10-MA (Duraloy), Thermalloy 64 (Duraloy), Manaurite® 36X, 36XM (Manoir Industries), Pyrotherm G25/35Nb, NbTZ (Pose Marre), Centralloy® 4852, 4852 Micro (Schmidt + Clemens), E2535Nb, E2535Nb-MA (Engemasa), Paralloy H39 (Doncasters Paralloy), Lloyds T63 (LBA), HR33 (Cronite).