Use & Application
For welding higher strength steel structures where PWHT is impracticable so that welds must possess an appropriate degree of toughness and crack resistance. The addition of about 1%Ni promotes microstructural refinement, with improved tolerance to procedural variations compared to plain CMn weld metal. Nickel also increases atmospheric weathering resistance and improves electrochemical balance between weld and base metal, thus minimizing preferential weld area corrosion in marine environments. For offshore oilfield sour service, a maximum of 1.0%Ni is commonly required (NACE MR0175). Also recommended where design requirements specify toughness testing of higher strength low alloy steel welds down to –50°C e.g. **offshore construction, pipelines and pressure vessels**. Preheat will dependent on the grade and thickness of the base material.
Alloy type
Low alloy steel alloyed with nominally 1%Ni for improved toughness. Actual Ni content is kept below 1% to ensure conformance with NACE MR0175.
Microstructure
In the as-welded condition the microstructure is ferritic with a component of acicular ferrite for optimum toughness.
Materials to be welded

Low temperature applications, fine-grained steels that contain 1 % Nickel.
EN W.Nr.: S460N (1.8901), S355N (1.0545), S460NL (1.8903), S460QL (1.8906).
ASTM: A333 & A334 gr. 6, A350 gr. LF2 & LF5, A352 gr. LCB & LCC (cast), A572 gr.50.
API: 5L X65.

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