Application Segments

Oil & Gas/CPI

Melting Route


Product Description

BÖHLER L825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing. The nickel content of BÖHLER L825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content provide resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes the alloy resistant to intergranular attack after exposure in the temperature range which would typically sensitize un-stabilized stainless steels. The material is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions. The fabrication of BÖHLER L825 is typical of nickel-base alloys, with material readily formable and weldable by a variety of techniques BÖHLER L825 shows good toughness, even under continuous operation, at both room and elevated temperatures, up to approximately 550 °C (1.020 °F) and is suitable for pressure vessels with wall temperatures up to 538 °C (1,000 °F).

Property Features

Iron-Nickel alloy with high amounts of chromium and additions of Molybdenum, copper and titanium. Excellent corrosions resistance in oxidising and non-oxidising media as well as excellent resistance towards pitting, crevice and stress corrosion cracking in chloride containing environments.

Technical Specifications

Material Numbers

Alloy 825 2.4858 NiCr21Mo N08825


B425 NACE MR0103 / ISO 17945 NACE MR0175 / ISO 15156

Chemical Composition

Chemical composition (average %)
max. 0.05 max. 0.5 max. 1.0 max. 0.03 19.5 to 23.5 2.5 to 3.5 38.0 to 46.0 1.5 to 3.0 0.6 to 1.2 max. 0.2 min. 22.0

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