Outokumpu 1.4318
Type X2CrNiN18-7 stainless steel: EN 1.4318, AISI 301LN, low carbon, high nitrogen
Applications
- Generally used for structural parts where high strength and toughness are needed beside a corrosion resistance similar to grade 1.4301 / AISI 304.
- When hardened by cold working (surface finish 2H or TR), the strength and corrosion resistance of this steel grade steel is utilized in structural applications, like in transportation vehicles.
- The combination between ductility and toughness is excellent even at low temperatures.
Welding
- Weldability is good. The thermal expansion is 1,5-times larger compared with carbon steels.
- Chromium and nickel contents of the filler metal have to match or to be higher than the composition of the base metal, e.g. type 19-9.
- Cleaning the weld seam has a significant importance for corrosion resistance. Pickling is recommended.
Forming and machining
- Work hardening is pronounced due to high work hardening rate and formation of martensite in the range of larger deformations.
- Formability is good, thus forces needed and the elastic return is bigger compared with carbon steels and even when compared with grade 1.4301 / AISI 304.
- Because of high ductility and work hardening it is recommended to use sharp cutting tools and an effective cooling and adequate feed of tool when machined.
Corrosion resistance
- Corrosion resistance is comparable to grade 1.4301 / AISI 304.
- Resistance to atmospheric corrosion is adequate for several applications. Special attention should be paid on surface finish and regular cleaning procedures in marine and industrial environments.
- In chloride containing solutions pitting and crevice corrosion is possible depending on various parameters like chloride concentration, temperature, pH value, redox potential, crevice geometry and others.
- When the temperature of chloride containing solutions exceeds 50°C and the construction is loaded, stress corrosion cracking is possible.
- The best material performance is reached usually with the help of adequate design, correct post-weld treatment and regular cleaning during use (if applicable).
Allgemeine Eigenschaften
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Technical Datasheet (English)
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