Alloy B2
Alloy B2 Seamless pipe 6m*4in. for Poland Client
Alloy B2 Fabrication and Heat treatment:
Welding Alloy B2 can be performed by TIG, MIG as well as coated electrode. Dissmilar metal welding alloy b2 to alloy b3 is possible using AWS ERNiMo-10 for GTAW and GMAW operations and ENiMo-10 for SMAW welding. The work piece should be thoroughly cleaned with acetone or other suitable cleaners to insure that all contaminants and markings are removed. Grinding prior to welding can be performed with a clean alumina-wheel that has not been previously used on any iron-based materials. There is no need for pre or post heat treatment processes unless the work piece has been formed by any means. A full solution anneal before welding is required on pieces that have been formed. Cold-formed pieces must be shot-peened before annealing.
Hot working should be performed in a temperature range between 1700℉ to 2250℉ with heavy deformation performed toward the upper end of the range. Reheating of the work piece may be necessary. A full solution anneal should be performed on all hot-worked pieces and any cold-worked pieces with more than 15% deformation followed by a water quench.
Solution annealing of Alloy b2 is performed at 1950℉ for 10 minutes at temperature followed by a water quench. Subject material should be charged into a hot furnace and monitored closely for accurate time at temperature. Contact thermocouples are preferred.
Resistance of Corrosion for Alloy B2:
The high molybdenum content in Alloy b2 gives the alloy excellent resistance to hydrochloric acid over a wide range of concentrations and temperatures.
B2 also shows good resistance to hydrogen chloride, sulfuric acid and phosphoric acids and has excellent resistant to pitting and stress corrosion cracking in the heat-affected zone. Uniform corrosion rates in various environments is very similar compared to the other Ni-Mo alloys such as B3. The presence of any oxidizing media, even in trace amounts, will significantly increase corrosion. B2 should not be used in oxidizing media, as these alloys show little to no resistance in such environments.
