High Pressure Corrosion Resistant 1.4439 Stainless Steel Lap Joint Flange EN1092

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Product Specification


High Light	High Pressure Lap Joint Flange ，Corrosion Resistant Stainless Steel Flange ，1.4439 Stainless Steel EN1092 Flange

X2CrNiMoN17-13-5 EN 10028-7 1.4439 High Pressure Stainless EN1092 Flange

Material Overview

Steel grade 1.4439 is a high-alloy austenitic stainless steel specifically engineered for applications requiring exceptional corrosion resistance in demanding environments such as seawater, chemical processing, and offshore installations.

Chemical Composition

Typical chemical composition of 1.4439 (in weight percent, approximate):

Element	Content (%)
Carbon (C)	≤ 0.03
Silicon (Si)	≤ 1.0
Manganese (Mn)	≤ 2.0
Phosphorus (P)	≤ 0.035
Sulfur (S)	≤ 0.015
Chromium (Cr)	19.0 – 21.0
Nickel (Ni)	24.0 – 26.0
Molybdenum (Mo)	4.0 – 5.0
Nitrogen (N)	0.10 – 0.20
Iron (Fe)	Balance

Alloy Benefits

High Chromium (≈20%): Forms a stable, protective chromium oxide film providing strong general corrosion resistance
High Nickel (≈25%): Stabilizes the austenitic structure, improves toughness and resistance to stress-corrosion cracking
High Molybdenum (4–5%): Greatly improves resistance to pitting and crevice corrosion in chloride-containing environments
Added Nitrogen (0.10–0.20%): Increases strength without sacrificing ductility and further boosts pitting resistance

Application Scope

1.4439 is specified when standard 316/316L stainless steel provides insufficient corrosion resistance. This material is ideal for aggressive media, desalination plants, offshore structures, and chemical processing equipment where superior performance is required.

Important: For design and certification purposes, always verify the exact composition range in the relevant standard or the mill's material certificate, as minor limits may vary between standards and producers.

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