Alloy 400 Pipes

Alloy 400 pipes (broadly recognized under the classic trade designation Monel 400® and classified under the universal standard UNS N04400) represent a premier metallurgical solution for these extreme environments. This single-phase, solid-solution nickel-copper binary alloy balances exceptional mechanical toughness with structural integrity across an expansive temperature range. HT PIPE is a nickel alloy 400 pipe supplier with 15+ export experience. Contact us for more information and quotes for free!

Product Forms

Bar & Rod

Plate & Sheet

Coil & Strip

Pipe & Tube

Fitting: Flange, Tee, Elbow, Reducer etc.

Forging: Ring, Shaft, Circle, Block etc.

Nickel Copper Alloy 400 Specifications

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Chemical composition

Corrosion Resistance Characteristics

The primary driver for procuring Alloy 400 pipes over high-grade stainless steels is its specialized performance in reducing chemical environments and halide exposures.

Chloride Stress Corrosion Cracking (SCC) Immunity

Chloride-induced SCC is a catastrophic failure mechanism for 300-series stainless steels in coastal settings and saline processing loops. Because Alloy 400 features a base chemistry containing more than 63% nickel, it is essentially immune to chloride stress corrosion cracking, reducing sudden structural line breaks.

Hydrofluoric and Sulfuric Acid Processing

Alloy 400 is one of the very few industrial structural metals capable of handling un-aerated hydrofluoric acid across all concentrations up to the boiling point. It establishes a remarkably predictable, low corrosion rate in non-oxidizing sulfuric, hydrochloric, and phosphoric acid arrays.

Critical Operational Limit: Alloy 400 pipes should not be deployed in strongly oxidizing environments, such as nitric acid systems or environments containing wet chlorine gas, ferric chlorides, or nitric acid mixtures. High concentrations of oxidizing salts rapidly accelerate surface pitting.

The Marine Flow Advantage

Standard copper-based marine piping alloys degrade quickly under the shear stresses of rapidly moving seawater, which strips away their protective oxide layers. Alloy 400 maintains a steady, predictable material loss rate of less than 0.03mm per year under high-velocity flow conditions. It resists cavitation, pitting, and crevice leaching in brackish and deep-sea environments.

Seamless Pipe: ASTM B165 / ASME SB165

These pipes are manufactured via hot extrusion followed by intensive cold drawing or pilgering to achieve exact wall dimensions.

Application Scope: Used in critical high-pressure processing lines, sour crude wells, hydrocarbon cracking plants, and heat exchanger feed loops.

Benefits: Absolute structural uniformity with no heat-affected zone (HAZ) variances or joint-efficiency reductions.

Welded Pipe: ASTM B725 / ASME SB725

Constructed by rolling flat-annealed alloy sheets and applying automatic gas-tungsten arc welding (GTAW) or plasma arc welding (PAW) methodologies.

Application Scope: Low-pressure wastewater lines, marine ballast transport systems, and large-diameter utility distribution networks.

Benefits: Offers a highly cost-efficient approach for large nominal pipe sizes (NPS) where heavy wall thickness is not a design priority.

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