HP40Nb

The consumables of the HP40Nb series are specifically designed for welding high-temperature resistant alloys. These include cast alloys with a chemical composition of 0.4%C-25%Cr-35%Ni-Nb, and microalloys enhanced with Ti to improve creep resistance. They are also compatible with Nb-free alloys and low Cr-Ni but high carbon variants, such as HK40, HT40, and IN519, where an overfeed of the weld metal is generally considered acceptable. HP40Nb offers remarkable resistance to sigma phase embrittlement. The integration of eutectic and secondary carbides ensures exceptional thermal and creep strength, effectively operating within the service temperature range of 900°C to 1100°C. High levels of Cr and Ni ensure excellent resistance to both oxidation and carburization. Main applications include pyrolysis coils and reformer tubes used in the production of ethylene in the petrochemical industry. Generally, the use of this material does not require 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)