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THOR115(11CrMoVNb) may replace Grade 91

Attention:     Issuing time:2019-10-08 17:02
In April 2015, ALSTOM introduced the application of new material THOR115 (11CrMoVNb) to the ASME specification case, which was jointly developed by Japan, Romania and Italy. The main feature is that the oxidation resistance is better than Grade 91, and the mechanical properties are equivalent to Grade 91.
Compared with Grade 91, THOR115 (11CrMoVNb) increases the content of Cr, decreases the content of W and CO, improves the ductility and weldability of the material, and reduces the cost of the material. The application provides data of six furnace numbers for steel plate and steel pipe in two product forms, including chemical composition, heat treatment conditions, tensile, impact, durable strength, creep rate, density, linear expansion rate, elastic modulus and thermal conductivity at different temperatures. The application data also provide a comparison of the experimental results of high temperature oxidation of TH0R115 with those of T91, 12CR and TP347.

THOR115 provides these advantages:
Increased steam oxidation resistance (working at above 600°C)
Long term stability based on modified microstructure
Superior creep behavior than grade 91.


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