Sanicro 28 Pipes Supplier – ASTM B668 UNS N08028 (Alloy 28)
ASC LLP supplies Sanicro 28 pipes and tubes – the high-alloy austenitic stainless steel also known as Alloy 28, UNS N08028 and W.Nr. 1.4563. We supply seamless ASTM B668 / ASME SB668 Sanicro 28 pipes for phosphoric and sulphuric acid plants, oil & gas production, seawater cooling and other highly corrosive service, with mill test certificates and export packing.
What is Sanicro 28?
Sanicro 28 is a high-alloy austenitic stainless steel containing about 27% chromium, 31% nickel, 3.5% molybdenum and 1% copper. This combination gives it excellent resistance to strong acids, pitting, crevice corrosion and chloride stress corrosion cracking – far beyond standard 316L and better than 904L in many acid environments. Its pitting resistance equivalent number (PREN) is about 39.
Sanicro® 28 is a trade name of Alleima (formerly Sandvik). The same grade is produced by other mills as Alloy 28 / UNS N08028 to ASTM B668, and all material we supply is certified to that specification.
Key Features of Sanicro 28 Pipes
- Acid resistance: excellent in phosphoric acid (including wet-process acid with fluorides and chlorides) and sulphuric acid.
- Pitting and crevice resistance: high chromium and molybdenum (PREN ≈ 39) resist attack in chloride-bearing water.
- Stress corrosion cracking resistance: the high nickel content gives very good resistance to chloride SCC.
- Sour-service approved: listed in NACE MR0175 / ISO 15156 for oil and gas equipment.
- Code approved: accepted for ASME Boiler and Pressure Vessel Code construction.
- Good weldability and formability: fully austenitic structure, welded with matching-composition filler.
Applications of Sanicro 28 Pipes
- Phosphoric acid plants: evaporator tubes, heat exchangers and process piping in wet-process acid production.
- Sulphuric acid service: piping and heat exchangers handling contaminated or hot sulphuric acid.
- Oil & gas: production tubing, casing and flowlines in sour (H₂S / CO₂ / chloride) wells.
- Seawater & cooling water: heat-exchanger tubes and pipework in chloride-rich cooling systems.
- Chemical & petrochemical: equipment handling fluoride-bearing and mixed-acid media.
- Power generation: condensers and tubing in aggressive cooling-water environments.
Types of Sanicro 28 Pipes & Tubes We Supply
- ASTM B668 Sanicro 28 Seamless Pipes – NPS schedule pipe for process piping.
- Sanicro 28 Seamless Tubes – OD × wall tubes for heat exchangers, condensers and evaporators.
- Sanicro 28 OCTG Tubing – cold-worked high-strength tubing for sour oil and gas wells (on request).
- Alloy 28 Welded Pipes – available on request for large diameters and lower-pressure service.
- Cut lengths & fabricated spools – cut to size to your drawing.
Sanicro 28 Pipe Size & Schedule Chart
| Parameter | Range |
| Pipe size (NPS) | 1/2″ to 12″ NB (larger on request) |
| Tube OD | 6 mm to 114.3 mm |
| Schedules | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Dimensional standard | ASME B36.19M / ASME B36.10M |
| Length | Single random, double random, cut length |
| Ends | Plain end, bevelled end |
| Finish | Bright annealed, annealed & pickled |
Mechanical Properties of UNS N08028 (Sanicro 28) Pipes
| Property | ASTM B668 Minimum (annealed) |
| Tensile Strength | 500 MPa (73 ksi) |
| Yield Strength (0.2% offset) | 214 MPa (31 ksi) |
| Elongation in 2″ (50 mm) | 40% |
Cold-worked Sanicro 28 tubing for oil & gas wells is supplied in much higher strength grades (for example 110 or 125 ksi yield) to customer or mill specifications.
Specifications of Sanicro 28 Pipes
| Specification | Details |
| Material standard | ASTM B668 / ASME SB668 (seamless pipe & tube) |
| European standard | EN 10216-5 (X1NiCrMoCu31-27-4, 1.4563) |
| Grade | Sanicro 28 / Alloy 28 / UNS N08028 / W.Nr. 1.4563 |
| Sour-service | NACE MR0175 / ISO 15156, NACE MR0103 |
| Condition | Solution annealed; cold-worked (OCTG) on request |
| Testing | Hydrostatic or eddy-current, PMI, IGC on request |
| Test certificate | EN 10204 3.1; 3.2 / third-party inspection on request |
Sanicro 28 Equivalent Grades
| Standard | Designation |
| Trade name | Sanicro® 28, Alloy 28 |
| UNS | N08028 |
| Werkstoff Nr. (DIN) | 1.4563 |
| EN | X1NiCrMoCu31-27-4 |
| ISO | 4563-080-28-I |
| Swedish standard | SS 2584 |
Sanicro 28 Chemical Composition (ASTM B668, UNS N08028)
| Element | Composition (%) |
| Nickel (Ni) | 29.5 – 32.5 |
| Chromium (Cr) | 26.0 – 28.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Copper (Cu) | 0.6 – 1.4 |
| Manganese (Mn) | 2.5 max |
| Silicon (Si) | 1.0 max |
| Carbon (C) | 0.030 max |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.030 max |
| Iron (Fe) | Balance |
Nominal Sanicro 28 analysis: Cr 27, Ni 31, Mo 3.5, Cu 1.0, C ≤ 0.020.
Physical Properties of Sanicro 28
| Property | Value (approx., at 20 °C) |
| Density | 8.0 g/cm³ |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 11 – 12 W/m·K |
| Specific Heat | 450 – 500 J/kg·K |
| Thermal Expansion (20–100 °C) | about 15 µm/m·K |
| Structure | Fully austenitic, non-magnetic |
Sanicro 28 vs 904L vs Alloy 20
| Property | Sanicro 28 (N08028) | 904L (N08904) | Alloy 20 (N08020) |
| Ni % (approx.) | 31 | 25 | 35 |
| Cr % (approx.) | 27 | 20 | 20 |
| Mo % (approx.) | 3.5 | 4.5 | 2.5 |
| Cu % (approx.) | 1 | 1.5 | 3.5 |
| PREN (approx.) | 39 | 35 | 28 |
| Best suited for | Phosphoric acid, sour wells, chlorides | Sulphuric acid, general chemical | Sulphuric acid |
Sanicro 28’s higher chromium gives it the best pitting resistance of the three and the strongest performance in phosphoric acid containing chlorides and fluorides. See our Alloy 20 plates.
Why Buy Sanicro 28 Pipes from ASC LLP?
ASC LLP has more than 30 years of experience supplying high-alloy pipes and tubes to process plants in India and overseas.
- Certified material: pipes supplied to ASTM B668 / ASME SB668 with EN 10204 3.1 mill test certificates.
- Full testing: hydrostatic / eddy-current, PMI and, on request, third-party inspection.
- Complete package: Sanicro 28 pipes, tubes and Sanicro 28 plates from one source.
- Cut-to-size & export-ready: cut lengths and seaworthy packing for worldwide delivery.
Related: Sanicro 28 Plates · Alloy 20 Plates · Alloy 31 (UNS N08031) Round Bars · Nickel & Nickel Alloys
Frequently Asked Questions – Sanicro 28 Pipes
What is Sanicro 28 equivalent to?
Sanicro 28 is equivalent to Alloy 28, UNS N08028, W.Nr. 1.4563 and EN X1NiCrMoCu31-27-4. Seamless pipe and tube are covered by ASTM B668 / ASME SB668 and EN 10216-5.
What is the chemical composition of Sanicro 28?
Per ASTM B668: nickel 29.5–32.5%, chromium 26–28%, molybdenum 3–4%, copper 0.6–1.4%, carbon 0.030% max, with iron as balance. The nominal Sanicro 28 analysis is 27Cr-31Ni-3.5Mo-1Cu.
Is Sanicro 28 a nickel alloy or a stainless steel?
It is a high-alloy austenitic stainless steel. Although it contains about 31% nickel, iron is still the main element, which is why its UNS number is in the N08xxx iron-nickel range.
What is the difference between Sanicro 28 and 904L?
Sanicro 28 has more chromium (27% vs 20%) and nickel (31% vs 25%), giving higher pitting resistance (PREN about 39 vs 35) and better resistance to phosphoric acid and chloride stress corrosion cracking. 904L is lower cost and often chosen for sulphuric acid service.
Is Sanicro 28 suitable for sour service?
Yes. UNS N08028 is listed in NACE MR0175 / ISO 15156, and cold-worked Sanicro 28 tubing is widely used for production tubing in sour oil and gas wells.
What is the density of Sanicro 28?
The density of Sanicro 28 is about 8.0 g/cm³.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
