MMA electrode – 2¼Cr-1Mo deposit which meets specific requirements for improved temper embrittlement resistance after prolonged service at 400-600°C. Relevant trace elements (P, Sn, As, Sb) are controlled to ensure low Bruscato (X) and Watanabe (J) factors.
Applications
These consumables are designed for prolonged elevated temperature service up to 600°C. The main areas of application are associated with a steam-generating power plant, eg piping, turbine castings, steam chests, valve bodies and boiler superheaters. Some of the consumables will also find service in refineries where they are used for corrosion resistance to sulphur-bearing crude oil at 250-450°C. Some of the consumables will also find applications in the chemical and petrochemical industries where they are used for resistance to hydrogen attack in the fabrication of hydrocrackers, coal liquefaction plant and NH3 pressure vessels operating at up to 450°C. In the as-welded condition, the consumables also provide a useful source of 300HV hardness weld deposit for build-up or hard surfacing to resist metal-to-metal wear, heavy impact and the repair of P20 mould steel.
Specification
AWS A5.5: E9018-B3 H4
BS EN ISO 3580-A: E CrMo2 B 3 2
BS EN ISO 3580-B: E 6216-2C1M