Alloy 400 Nickel Pipe

UNS N04400 / W.Nr. 2.4360

COMMON TRADE NAMES: Monel® 400, Nickel-Copper

Alloy 400 is a nickel-copper alloy exhibiting excellent corrosion resistance in seawater, marine atmospheres, organic acids, and other aggressive media. Alloy 400 exhibits outstanding corrosion resistance, high strength, and toughness over a wide range of temperatures. It is a solid solution strengthened alloy with a nominal chemical composition of 66% nickel, 31% copper, and additions of iron and manganese. It is referred to by the tradename Monel® 400 and the universal designation UNS N04400.

Characteristics

Corrosion Resistance

Alloy 400 exhibits outstanding corrosion resistance in seawater, reducing acids, non-oxidizing salts, alkalis, high-temperature steam, and other media. It is one of the few alloys that can withstand unaerated hydrofluoric acid and is virtually immune to chloride stress corrosion cracking. However, it is not suitable for oxidizing acids and salts.

Mechanical Properties

Alloy 400 can be provided in the lower strength, annealed condition, or strengthened through the pilger process. Alloy 400 maintains excellent toughness even in the higher strength conditions and does not become brittle at temperatures down to ¬320°F (-196°C).

Heat Treatment

While Alloy 400 cannot be strengthened by heat treating, annealing or stress relieving are commonly used after hot working or cold working operations to restore ductility and corrosion resistance.

Applications

Applications for Alloy 400 are found in many different market segments, including oil & gas, chemical processing, marine, piping, heat exchangers, transportation, agriculture, and aerospace. CRA offers specialty alloy 400 seamless pipe & tube for use in multiple industries in a wide range of critical applications, including:

Oil & Gas
Chemical Processing
Marine
Transportation
Agriculture
Aerospace
Piping

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Chemical Composition

C	Fe	Mn	Si	Cu	S	Al	Ni + Co
≤ 0.3	≤ 2.5	≤ 2	≤ 0.5	28 - 34	≤ 0.024	≤ 0.5	63 - 70

(mass %)

Specifications

ASTM B163, ASTM B165, ASME SB163, ASME SB165, AMS 4574, MIL-T 1368

Specified Mechanical Properties in Annealed Condition

Per ASTM B163 / ASTM B165, ASME SB163 / ASME SB165, AMS 4574, MIL-T 1368

Tensile Strength	Yield Strength	Elongation
minimum, ksi	minimum, ksi	minimum, %
70	28	35

*Higher strength properties can be provided in the cold hardened condition.

Typical Physical & Mechanical Properties in Annealed Condition

		70°F	200°F	400°F	600°F	800°F
Density	lbs/in³	0.318	-	-	-	-
Thermal Expansion	X10^-6/°F	-	7.7	8.6	8.8	8.9
Elastic Modulus	10³ ksi	26	-	-	-	-
Poisson Ratio	-	0.32	-	-	-	-
Thermal Conductivity	Btu-in/h·ft² ·°F	151	167	193	215	238
Specific Heat	Btu/lb·°F	0.102	0.105	0.11	0.114	-
Yield Strength	ksi	28	22	20	19	19
Tensile Strength	ksi	70	61	57	55	54

Manufacturing Process

PROCESS	DESCRIPTION
Steel Making	Electric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe Making	Conventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat Treatment	Cannot be hardened by heat treatment. May be provided in the annealed or cold hardened condition.

Schedule Pipe

Manufacturing Capabilities

CRA offers this alloy in:
Seamless Pipe

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
THICKNESS: Up to 1.925”
LENGTHS: Up to 70′

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated