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Steel grade 1.4541 is a stabilized austenitic stainless steel, better known by its EN designation X6CrNiTi18-10 and closely equivalent to AISI 321. This material is commonly specified for flanges, pipes, fittings, and components exposed to elevated temperatures where resistance to intergranular corrosion is critical.
Typical Chemical Composition for 1.4541 Flanges
For flanges manufactured from 1.4541 steel, the typical chemical composition (in weight percent, % by mass) is:
Element
Composition Range
Carbon (C)
≤ 0.08
Silicon (Si)
≤ 1.0
Manganese (Mn)
≤ 2.0
Phosphorus (P)
≤ 0.045
Sulfur (S)
≤ 0.015 (up to 0.03 max depending on standard)
Chromium (Cr)
17.0 – 19.0
Nickel (Ni)
9.0 – 12.0
Titanium (Ti)
≥ 5 × C and typically 0.3 – 0.7 (often quoted 0.30 – 0.80)
Nitrogen (N)
≤ 0.10
Iron (Fe)
Balance (remainder)
Key Material Characteristics
Austenitic stainless steel: The chromium (17–19%) and nickel (9–12%) levels place 1.4541 in the 18/10 austenitic stainless family, similar to 304/304L, but with titanium stabilization.
Titanium stabilized: The addition of titanium (at least 5 times the carbon content) is critical. It binds carbon to form titanium carbides, which prevents chromium carbide precipitation at grain boundaries and enhances resistance to intergranular corrosion, particularly after welding or exposure to temperatures around 500–800°C.
Controlled carbon content: While carbon is controlled (≤ 0.08%), the primary corrosion resistance mechanism in the heat-affected zone is titanium stabilization rather than the extra-low carbon approach used in "L" grades.
Standard Designations and Specifications
EN Designation: X6CrNiTi18-10
EN Numeric: 1.4541
Approximate Equivalent: AISI 321
Flanges in 1.4541 are commonly manufactured according to EN 1092-1, ASME/ANSI B16.5, and other relevant standards. The chemical composition is governed by material standards such as EN 10088 for stainless steels.
Practical Application Note
Exact composition limits may vary slightly depending on the specific product standard (plate, bar, forging, etc.) and manufacturing source. For precise flange specifications, always refer to:
The material standard specified in the flange documentation (e.g., EN 10088, ASTM A182 F321)
The mill test certificate (MTC) / material certificate (e.g., EN 10204 3.1), which provides the actual measured composition for that production heat
The composition range provided serves as a reliable general reference for "1.4541 steel" in flange applications.
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...
