Datasheet updated

2024-01-11 10:29
(supersedes all previous editions)

Sanicro® 28 is a high-alloy multi-purpose austenitic stainless steel for service in highly corrosive conditions. The grade is characterized by:

  • Very high corrosion resistance in strong acids
  • Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
  • High resistance to pitting and crevice corrosion
  • Good weldability


  • UNS: N08028
  • EN Number: 1.4563
  • EN Name: X 1 NiCrMoCu 31-27-4
  • W.Nr.: 1.4563


Product standard
EN 10088-3, EN 10272
Status according to EN 10 204 3.1

Chemical composition (nominal)

Chemical composition (nominal) %
C Si Mn P S Cr Ni Mo Cu
≤0.020 ≤0.6 ≤2.0 ≤0.025 ≤0.010 27 31 3.5 1.0

Mechanical properties

Bar steel is tested in delivery condition.

The following figures apply to material in the solution annealed and quenched condition.

At 20°C (68°F)

Metric units, Bar
Proof strength Tensile strength Elong. HB
Rp0.2a) Rm Ab)
MPa MPa %
≥220 500-750c) ≥35 ≤220
Imperial units, Bar
Proof strength Tensile strength Elong. Hardness
Rp0.2a) Rm Ab) Rockwell C
ksi ksi %
≥32 72-108 ≥35 14

1 MPa = 1 N/mm2
a) Rp0.2 corresponds to 0.2% offset yield strength.
b) Based on L0 = 5.65√S0 , where L0 is the original gauge length and S0the original cross-section area.
c) For sizes below 50 mm/2" Rm min. 800 MPa.

Impact strength

Due to its austenitic microstructure, Sanicro® 28 has very good impact strength both at room temperature
and at cryogenic temperatures.

Tests have demonstrated that the steel fulfils the requirements according to the European standards prEN 13445-2 (UFPV-2)
(min.60J (44ft-lb) at-270oC (-455 oF)) and EN10272 (min. 60J (44ft-lb)at-196oC (-320oF).


The weldability of Sanicro® 28 is good. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.

For Sanicro® 28, heat-input of <1.0 kJ/mm and interpass temperature of <150°C (300°F) are recommended. A string bead welding technique should be used.

Recommended filler metals

TIG/GTAW or MIG/GMAW welding

ISO 14343 S 27 31 4 Cu L/AWS A5.9 ER383 (e.g. Exaton 27.31.4.LCu)

MMA/SMAW welding

ISO 3581 E 27 31 4 Cu L R/AWS A5.4 E383-16 (e.g. Exaton 27.31.4.LCuR)

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.

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