Alloy 28 Schedule Pipe & Tube

Corrosion Resistant Alloys > Alloys > 28CR > Alloy 28 Schedule Pipe & Tube

Alloy 28 Nickel Pipe & Tube

UNS N08028 / W.Nr. 1.4563

COMMON TRADE NAMES: Sanicro® 28, SAF® 28, Nic28, NiCro 31/27

Alloy 28 is a highly alloyed austenitic stainless steel intended for highly corrosive environments. It is resistant to strong acids, pitting corrosion, crevice corrosion, and stress corrosion cracking. Alloy 28 is commonly referred to by the tradename Sanicro® 28, 28 Chrome, and the universal designation of UNS N08028.

Characteristics

Corrosion graphic

Corrosion Resistance

Alloy 28 has excellent resistance to strong acids, including phosphoric, hydrochloric, nitric, formic, and sulfuric acids. Its resistance to pitting and corrosion resistance makes it suitable for seawater piping and heat exchangers.
Service Temperature

Elevated Temperature Resistance

Alloy 28 should not be exposed to temperatures exceeding 1100°F (593°C) for prolonged periods as this may result in embrittlement.
Mechanical Properties

Mechanical Properties

In the annealed condition, Alloy 28 has a minimum yield strength of 32 ksi. However, it may also be provided in the cold-worked condition with yield strength exceeding 125 ksi. It maintains excellent toughness at cryogenic temperatures.
heat treatment logo

Heat Treatment

Alloy 28 cannot be strengthened by heat treating. Annealing is performed at 2000°F - 2100°F (1093°C - 1149°C), followed by rapid cooling.
Workability

Workability

Alloy 28 can be cold formed. However, it has a moderately high work hardening rate, so intermediate anneals may be required. Annealing is also recommended subsequent to hot forming or cold forming in order to achieve optimal stress corrosion resistance.

Applications

Alloy 28 is used for heat exchangers in severely corrosive conditions high in chlorides, such as marine applications and oil and gas production. CRA offers specialty alloy 28 seamless pipe & tube for use in multiple industries and applications, including:

  • Oil & Gas
  • Chemical Processing
  • Marine
  • Nuclear

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Chemical Composition

CCrNiFeMnSiMoCuPS
≤ 0.0326 - 2829.5 - 32.5BAL≤ 2.5≤ 13 - 40.6 - 1.4≤ 0.03≤ 0.03
(mass %)

Specifications

ASTM B668, ASME SB668

Specified Mechanical Properties in Annealed Condition

Per ASTM B668

Tensile StrengthYield StrengthElongation
minimum, ksiminimum, ksiminimum, %
733140
*Higher strength properties can be provided in the cold hardened condition.

Typical Physical Properties

  70°F200°F400°F600°F800°F
Densitylbs/in30.29----
Thermal ExpansionX10-6/°F-88.599
Elastic Modulus103 ksi28.327.626.325.123.8
Poisson Ratio-0.3----
Thermal ConductivityBtu-in/h·ft2·°F6684102114132
Specific HeatBtu/lb·°F0.110.120.120.120.13
Yield Strengthksi3128232219
Tensile Strengthksi7374645753

Manufacturing Process

PROCESSDESCRIPTION
Steel MakingElectric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe MakingConventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat TreatmentCannot be hardened by heat treatment. May be provided in the annealed or cold hardened condition.

Product Availability

CRA offers this alloy in:
Seamless Pipe & Tube

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