Alloy 400 Tubing

Alloy 400 Tubing

Alloy 400 Tubing

Alloy 400 Tubing

This nickel-copper chemistry features a high intensity single-phase solid solution metallurgical structure. Alloy 400 has greater corrosion resistance than nickel under reducing conditions and is more resistant than copper under oxidizing conditions. Due to its performance, this grade has been widely used in applications requiring strong resistance to corrosive environments featuring acids, alkalies, and high temperature steam. It is all but immune to the stress corrosion cracking (SCC) induced by chlorides and most freshwater conditions.

Considered a very tough material as measured by impact testing, alloy 400 tubing has excellent mechanical properties in sub-zero conditions. Even when the alloy is cooled to the temperature of liquid hydrogen, it does not undergo a ductile-to-brittle transformation. On the warmer side of the temperature range, alloy 400 performs well in temperatures up to 1000° F.

Product Specifications

ASTM B163, B165 / ASME SB163 / NACE MR0175

Size Range

Outside Diameter (OD)

Wall Thickness

.125”–1.000”

.035″–.065″

Cold finished and bright annealed tube.

Chemical Requirements

Alloy 400 (UNS N04400)
Composition %

Ni
Nickel

Cu
Copper

Fe

Iron

Mn
Manganese

C

Carbon

Si
Silicon

S
Sulfur

63.0 min

28.0–34.0

2.5 max

2.0 max

0.3 max

0.5 max

0.024 max

Chemical Requirements

Alloy 400 (UNS N04400)
Composition %

Ni

Cu

Fe

Mn

C

Si

S

63.0 min

28.0–34.0

2.5 max

2.0 max

0.3 max

0.5 max

0.024 max

Dimensional Tolerances

OD

OD Tolerance

Wall Tolerance

.094"–.1875" excl

+.003”/-.000”

± 10%

.1875"–.500" excl

+.004”/-.000”

± 10%

.500”–1.250” incl

+.005”/-.000”

± 10%

Mechanical Properties

Yield Strength:

28 ksi min

Tensile Strength:

70 ksi min

Elongation (min 2"):

35%

Fabrication

Alloy 400 can be satisfactorily fabricated, welded, and joined by standard methodologies and rates of production. Usually, subsequent thermal treatment to effect re-balancing of the alloy is not required. Contact PAC Stainless for detailed fabrication and welding information.

Industry Applications

Aerospace
Used in aerospace applications, alloy 400's high nickel content makes it an excellent choice for aircraft hydraulics and exhaust systems.
Chemical Process
With a high melting point and toughness under the harshest conditions, alloy 400 is used in the chemical process industry in boiler feeders and heat exchangers in high temperatures or in the presence of hydrofluoric acid.
Fabrication
With a superior corrosion resistance in seawater, alloy 400 is preferred in the fabrication of seawater heat exchangers and waste water treatment evaporators.
Marine
Due to its mechanical properties and outstanding performance in seawater, alloy 400 is often used on ships in heat exchangers, seawater cooling systems, and discharge tubing.
Oil & Gas
Alloy 400 is used in sour service in oil and gas production where the tubing is not susceptible to stress corrosion cracking or localized corrosion.
Power Generation
Alloy 400 can handle a wide range of parameters when dealing with chemical exposure, temperature, immersion, impingement and siding abrasion in the removal of sulfur from flue gas. See power generation for more information.
Pulp & Paper
The high nickel and copper content of alloy 400 makes it a popular choice for digesters and bleach plants in the pulp and paper industry because the tubing can resist high temperatures, corrosive liquors, and natural compounds in wood chips.