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1.4550 steel is an austenitic stainless steel grade, better known under the AISI/EN designation X6CrNiNb18-10. This grade is very similar to 1.4301/AISI 304, but is stabilized with niobium for enhanced performance characteristics.
Chemical Composition
Element
Content (Weight %)
Carbon (C)
≤ 0.08%
Silicon (Si)
≤ 1.0%
Manganese (Mn)
≤ 2.0%
Phosphorus (P)
≤ 0.045%
Sulfur (S)
≤ 0.015%
Chromium (Cr)
17.0 – 19.0%
Nickel (Ni)
9.0 – 12.0%
Niobium (Nb)
Stabilized with Nb; typically 0.2 – 1.0% (Nb ≥ 10 × C, up to ~1%)
Nitrogen (N)
≤ 0.10%
Iron (Fe)
Balance (remainder)
Key Characteristics
Austenitic stainless steel with excellent corrosion resistance, comparable to 304 grade
Niobium-stabilized to prevent chromium carbide precipitation at grain boundaries
Enhanced resistance to intergranular corrosion, particularly after welding or exposure to sensitization temperatures (450–850 °C)
Typical Applications
Chemical and petrochemical industry components
Pipeline systems and pressure vessels
Welded structures requiring superior corrosion resistance and weldability
Note: Minor variations in chemical composition limits may occur depending on the specific standard (e.g., EN 10088) or material certificate. Always verify exact specifications against the relevant datasheet or mill test certificate for your application requirements.
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
Best Alloy Engineering Alloy Pipe as s a reference point for excellence in the manufacture and distribution of fittings, piping, bends, forged flanges , clad products and specialties for the upstream, midstream and downstream sectors of oil & gas, thermal and nuclear power generation.
The C...
