COMMON TRADE NAMES: Alloy 28, 28Cr, Sanicro 28™, SAF 28®, VM® 28, Nic28, NiCro 31/27
28 Chrome, or Alloy 28, is a cold hardened 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.
28 Chrome is used in severely corrosive conditions high in chlorides, such as marine applications and oil and gas production. In upstream oil and gas, 28 Chrome’s increased resistance to the effects of H2S relative to stainless steels allows its use as downhole tubular components, packers, and other subsurface equipment in sour wells with high-pressure and high-temperature (HPHT) conditions and Acid Gas Injection (AGI) wells. CRA offers specialty alloy 28 Chrome seamless pipe & tube for use in multiple industries and applications, including:
C | Cr | Ni | Fe | Mn | Si | Mo | Cu | P | S |
---|---|---|---|---|---|---|---|---|---|
≤ 0.03 | 26 - 28 | 29.5 - 32.5 | BAL | ≤ 2.5 | ≤ 1 | 3 - 4 | 0.6 - 1.4 | ≤ 0.03 | ≤ 0.03 |
API 5CRA / ISO 13680 Group 3 Category 27-31-4
Grade | Yield Strength ksi | Tensile Strength ksi | Elongation % | Hardness HRC | NACE MR0175/ISO 15156 H2S Sour Service Limits |
||
min | max | min | min | max | |||
110 | 110 | 140 | 115 | 11 | 33 | Table A.14 Type 4c | No limit ≤ 270°F, Refer to table for temperatures up to 450°F |
125 | 125 | 150 | 130 | 10 | 35 | ||
140 | 140 | 160 | 145 | 9 | 38 | 140 Grade not recommended for sour service |
Tensile Strength | Yield Strength | Elongation |
minimum, ksi | minimum, ksi | minimum, % |
73 | 31 | 40 |
70°F | 200°F | 400°F | 600°F | 800°F | ||
---|---|---|---|---|---|---|
Density | lbs/in3 | 0.29 | - | - | - | - |
Thermal Expansion | X10-6/°F | - | 8 | 8.5 | 9 | 9 |
Elastic Modulus | 103 ksi | 28.3 | 27.6 | 26.3 | 25.1 | 23.8 |
Poisson Ratio | - | 0.3 | - | - | - | - |
Thermal Conductivity | Btu-in/h·ft2·°F | 66 | 84 | 102 | 114 | 132 |
Specific Heat | Btu/lb·°F | 0.11 | 0.12 | 0.12 | 0.12 | 0.13 |
Yield Strength | ksi | 31 | 28 | 23 | 22 | 19 |
Tensile Strength | ksi | 73 | 74 | 64 | 57 | 53 |
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. |
MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
MAX WALL THICKNESS: 1.925”
LENGTHS: Up to 70′ (840”)
END FINISH: Plain end, Premium threads, & API threads
Standard & Non-Standard Sizes Available.
Manufactured Material Available as Quickly as 1 Week.
Non-Standard Mill Quantities Accommodated
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