What is Monel 400 tubing used for?

Monel 400 tubing is specified for seawater heat-exchanger and condenser bundles, naval feedwater heaters, HF acid alkylation tube bundles, brackish-water condensers and chemical process service where austenitic stainless and copper alloys fail. ASTM B163 covers condenser and heat-exchanger tube; ASTM B165 covers seamless pipe and general-purpose tube. Both standards reference UNS N04400 with chemistry per ASTM B127.

Is Monel 400 tube seamless or welded?

ASTM B163 and B165 both permit seamless and welded Monel 400 tube. Cold-drawn seamless is the default for heat-exchanger bundles below NPS 2; welded with cold-finished after weld is supplied for larger OD and where wall uniformity is less critical. The MTC declares the route. For sour service and HF alkylation, specify seamless explicitly.

What is the difference between ASTM B163 and B165 Monel 400 tube?

ASTM B163 is the condenser and heat-exchanger tube specification: cold-drawn small-diameter tube with eddy-current testing per the standard, intended for shell-and-tube bundles. ASTM B165 is the seamless pipe and tube specification: covers a wider OD and wall envelope including pipe schedules, hydrostatic test per the standard, intended for general process and structural piping. Both apply to UNS N04400. Order to B163 for tube-bundle service; order to B165 for pipe and general tube.

Does Monel 400 tube need NACE MR0175 certification?

Monel 400 (UNS N04400) is listed in NACE MR0175 / ISO 15156-3 for sour service in the annealed and cold-worked stress-relieved conditions at a hardness ceiling of 35 HRC. Tube ordered to ASTM B163 or B165 in the annealed condition clears the NACE hardness gate by design. For an H2S service order, specify NACE MR0175 / ISO 15156-3 on the purchase order; TorqBolt issues EN 10204 type 3.2 MTC with the NACE compliance statement.

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Tube Monel 400 — UNS N04400 selon ASTM B165 / B725

Le tube Monel 400 (UNS N04400) est le tube nickel-cuivre de référence pour le service à l'acide fluorhydrique (HF), l'eau de mer chaude, les conduites de saumure et les lignes chimiques réductrices. TorqBolt fournit selon ASTM B165 (sans soudure), B725 (soudé) et B775 (avec CND) en tailles NPS 1/8" à 24", planches 5 à XXS.

Composition chimique

Élément	Plage (% en poids)
Nickel (Ni)	63 min
Copper (Cu)	28 - 34
Iron (Fe)	2.5 max
Manganese (Mn)	2.0 max
Silicon (Si)	0.50 max
Carbon (C)	0.30 max

Propriétés mécaniques

Propriété	Valeur (min)
Tensile / Zugfestigkeit / Carico rottura / Résistance traction	70 ksi / 485 MPa
0.2% yield	28 ksi / 195 MPa
Elongation	35%
Hardness HRB	60-80

Applications

Alkylation HF (raffinerie)
Eau de mer chaude / saumure
Acide sulfurique < 80%
Évaporateurs de soude caustique
Lignes d'échangeurs marins

Normes

ASTM B165
ASTM B725
ASTM B775
ASME SB-165 / SB-725
NACE MR0103

Questions fréquentes

Devis en 24h avec certification EN 10204 3.1 ou 3.2.

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Tube Monel 400 — UNS N04400 selon ASTM B165 / B725

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