Get a Quote

Sanicro® 28 Flanges Supplier: UNS N08028 / EN 1.4563, ASME B16.5 & EN 1092-1 Dimensions

Sanicro 28 Flanges for Phosphoric Acid, Sulphuric Acid and Chloride Service

Sanicro 28 flanges are made from UNS N08028 / EN 1.4563, a 27Cr-31Ni-3.5Mo-Cu austenitic alloy. The material is not covered by ASTM A182 or B462, so flanges are forged or machined from 1.4563 bar (EN 10088-3 / EN 10272) to ASME B16.5, B16.47 or EN 1092-1 dimensions, and the pressure rating is confirmed by your design.

Dinesh Tube India supplies Sanicro 28 weld neck, slip-on, socket weld, blind, lap joint, threaded and orifice flanges from Mumbai, with EN 10204 3.1 mill test certificates and third-party inspection on request.


Table of Contents


What Is Sanicro 28 and Why Is It Used?

Sanicro 28 is a high-alloy, extra-low-carbon austenitic stainless alloy with about 27% chromium, 31% nickel, 3.5% molybdenum and 1% copper. It was developed for wet-process phosphoric acid plants and is used for sulphuric acid (especially 40–70% deaerated and above 85%), acids contaminated with chlorides or fluorides, and chloride-bearing cooling water. It resists pitting, crevice corrosion, stress corrosion cracking and intergranular corrosion. In seawater, super duplex grades such as SAF 2507 are more resistant, so the grade should be chosen for the actual process medium.

Long exposure in roughly the 600–1000 °C range can precipitate intermetallic phases and reduce toughness, so the material is used in the solution-annealed condition and is not intended for long-term high-temperature service.

Sanicro 28 UNS N08028 flanges

What Are the Sanicro 28 Equivalent Grades?

Common nameUNSEN / W.NrEN nameSSAFNORISO
Sanicro 28 / Alloy 28N080281.4563X1NiCrMoCu31-27-42584Z1NCDU31-27-034563-080-28-I

These designations cover the same alloy, but each standard has its own limits; name the standard you need on the order. There is no direct JIS equivalent. Sanicro® is a trademark of Alleima. Dinesh Tube India is an independent supplier and is not affiliated with the trademark owner.

Sanicro 28 Chemical Composition (%)

BasisCSiMnPSCrNiMoCuN
Nominal≤ 0.020————27313.51.0—
EN 1.4563 limits≤ 0.020≤ 0.70≤ 2.00≤ 0.030≤ 0.01026.0 – 28.030.0 – 32.03.0 – 4.00.70 – 1.50≤ 0.11

Iron is the balance. ASTM limits for UNS N08028 (for example ASTM B668 for pipe) differ slightly; check the standard named in your order.

Which Material Specification Are Sanicro 28 Flanges Made To?

RouteMaterial standardNotes
Forged or machined from barEN 10088-3 / EN 10272, grade 1.4563Usual route; bar is supplied solution annealed
Purchaser’s specificationProject or licensor specification for UNS N08028State chemistry, properties and tests required
Not applicableASTM A182 / B462These forging specifications do not list UNS N08028

Mating pipe is usually ASTM B668 / EN 10216-5 seamless; see our Sanicro 28 pipes and pipe fittings.

Which Flange Types and Dimension Standards Are Available?

Flange typeDimension standardSizes
Weld neck, slip-on, blind, threaded, lap jointASME B16.5½" – 24"
Socket weldASME B16.5½" – 3"
Large-diameter weld neck and blindASME B16.47 Series A or B26" – 48" on request
Orifice flangesASME B16.361" – 24"
Spectacle blinds, spacers and spadesASME B16.48On request
Metric flangesEN 1092-1, PN6 – PN63DN15 – DN600
Sanicro 28 Weld Neck Flanges

Sanicro 28 Weld Neck Flanges

Butt-welded to pipe; bore matched to the pipe schedule.
Sanicro 28 Slip-On Flanges

Sanicro 28 Slip-On Flanges

Fillet-welded inside and outside for lower-pressure lines.

Sanicro 28 Socket Weld Flanges

Sanicro 28 Socket Weld Flanges

For small-bore lines up to 3".
Sanicro 28 Blind Flanges

Sanicro 28 Blind Flanges

To close pipe ends, nozzles and vessel openings.

Sanicro 28 Lap Joint Flanges

Sanicro 28 Lap Joint Flanges

Used with a stub end; the stub end carries the wetted surface.
Sanicro 28 Orifice Flanges

Sanicro 28 Orifice Flanges

To ASME B16.36 with pressure tappings for flow measurement.

How Is the Pressure Class and Rating Set?

  •   Dimensions: flanges are made to the dimensions of the class or PN you order (Class 150 – 2500, or PN6 – PN63).
  •   Rating: UNS N08028 is not a listed material in ASME B16.5, so the B16.5 pressure-temperature tables do not assign it a rating. Your piping or vessel designer confirms the allowable pressure and temperature for the class chosen.
  •   Weld neck bore: state the pipe schedule or bore so the hub matches the mating pipe.
  •   Marking: each flange is marked with material, heat number, size and class or PN for traceability.

Which Facing, Bolting and Gaskets Should You Specify?

ItemOptionsNotes
FacingRaised face (RF), flat face (FF), ring type joint (RTJ); tongue-and-groove or male-female on requestRF is the default; FF to mate with non-metallic or cast flanges
Face finishSerrated (stock) finish for spiral-wound and soft gaskets; smooth finish on requestState the Ra range if your gasket supplier specifies one
BoltingSpecified by the purchaser, for example ASTM A193 B8M Class 2 or A320 boltingSelect bolting for the service temperature and the external environment
GasketsSpiral-wound, PTFE-based or ring joint gaskets compatible with the process fluidRing joint gaskets must be softer than the flange groove

Sanicro 28 Mechanical Properties

Product standardTensileYield (0.2%) minElongation min
EN 10088-3 bar, 1.4563 (solution annealed)500 – 750 MPa220 MPa35%
ASTM B668 pipe and tube (for comparison)500 MPa (73 ksi) min214 MPa (31 ksi)40%

Actual values are reported on the mill test certificate. Physical properties: density about 8.0 g/cm³.

Which Tests and Certification Apply?

  •   Standard: chemical analysis and tensile test per the material standard, dimensional and visual inspection to the dimension standard.
  •   On request: positive material identification (PMI), hardness, ASTM A262 Practice C (Huey) intergranular corrosion test, ultrasonic or dye-penetrant examination.
  •   Documents: EN 10204 3.1 mill test certificate as standard; 3.2 certificate or third-party inspection by your nominated agency on request. See our quality and inspection process.

Sanicro 28 Flange Specification

Material

UNS N08028 / EN 1.4563 (bar to EN 10088-3 / EN 10272, or purchaser’s spec)

Dimensions

ASME B16.5, B16.47 A / B, B16.36, B16.48; EN 1092-1

Size

½" – 24" (B16.5); 26" – 48" (B16.47) on request

Class / PN

Class 150 – 2500; PN6 – PN63 (rating confirmed by design)

Types

WN, SO, SW, BL, LJ, threaded, orifice, spectacle blind

Facing

RF, FF, RTJ; T&G and M&F on request

Condition

Solution annealed, machined

Certification

EN 10204 3.1; 3.2 / third-party inspection on request
Sanicro 28 flange specification

How to Order Sanicro 28 Flanges: RFQ Example

A complete enquiry lets us quote in one round. Replace the values with your own.

ItemExample
MaterialUNS N08028 / EN 1.4563 (Sanicro 28), forged bar to EN 10272
Type, size, classWeld neck, 4" Class 150, raised face, ASME B16.5
BoreTo suit 4" Sch 10S pipe (ASTM B668)
Quantity12 nos
TestsPMI on each piece; ASTM A262 Practice C if required
DocumentsEN 10204 3.1; third-party inspection if required
DeliveryDestination port or site and required date

Send your Sanicro 28 flange RFQ in this format to kamlesh@dineshtube-india.com, call or WhatsApp +91 83559 10913, or send an enquiry.

Where Are Sanicro 28 Flanges Used?

  •   Wet-process phosphoric acid plants: evaporators, heat exchangers and piping
  •   Sulphuric acid piping and heat exchangers
  •   Fertiliser plants handling fluoride-bearing gases
  •   Heat exchangers on chloride-bearing cooling water
  •   Piping for corrosive oil and gas in treatment facilities

Other Sanicro 28 products: pipes, tubes, pipe fittings and sheets and plates. For other acid-service grades see Alloy 20 flanges and SMO 254 flanges.

Sanicro 28 Flanges: FAQs

What is the equivalent of Sanicro 28?

Sanicro 28 is UNS N08028, EN 1.4563 (X1NiCrMoCu31-27-4), Swedish SS 2584 and AFNOR Z1NCDU31-27-03. It is often called Alloy 28. These designations describe the same alloy family, but each standard has its own limits, so the order should name the standard you need.

What is the chemical composition of Sanicro 28?

Nominally about 27% chromium, 31% nickel, 3.5% molybdenum and 1% copper with very low carbon (0.020% max), balance iron. EN 1.4563 limits are Cr 26.0–28.0, Ni 30.0–32.0, Mo 3.0–4.0 and Cu 0.70–1.50%.

Which material specification are Sanicro 28 flanges made to?

ASTM A182 and ASTM B462 do not cover UNS N08028. Sanicro 28 flanges are normally forged or machined from bar to EN 10088-3 / EN 10272 grade 1.4563, or made to the purchaser’s own material specification, with dimensions to ASME B16.5, B16.47 or EN 1092-1.

Does ASME B16.5 give a pressure rating for Sanicro 28 flanges?

UNS N08028 is not a listed material in ASME B16.5, so the standard’s pressure-temperature tables do not assign it a rating. The flange can be made to B16.5 dimensions for a chosen class, but the allowable pressure and temperature must be confirmed by the purchaser’s piping or vessel design.

What is the difference between Sanicro 28 and 904L?

Sanicro 28 has more chromium (about 27% against 20%) and nickel (31% against 25%) than 904L (UNS N08904). It performs better in wet-process phosphoric acid, chloride-contaminated sulphuric acid and other strong acids. They are different grades and are not interchangeable without approval.

Which filler metal is used to weld Sanicro 28 flanges?

TIG (GTAW) is the preferred method. The matching filler is Sanicro 28 / AWS A5.9 ER383 wire, or E383 covered electrodes for manual metal-arc welding. Follow your qualified welding procedure.

What should a Sanicro 28 flange enquiry include?

Give the material (UNS N08028 / EN 1.4563 and the material standard), flange type, size, class or PN, facing, bore or schedule for weld neck and socket weld flanges, quantity, tests (PMI, ASTM A262 Practice C if required), documents (EN 10204 3.1, 3.2 or third-party inspection) and the delivery date.

Export Destinations for Sanicro 28 Flanges

We supply Sanicro 28 flanges from Mumbai within India and export to fabricators, EPC contractors and plants in the Middle East, Africa, Asia, Europe and the Americas. Tell us your destination port when you enquire.