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
Standards
-
UNS: N08028 -
EN Number: 1.4563 -
EN Name: X 1 NiCrMoCu 31-27-4 -
W.Nr.: 1.4563
Standards
Product standard
EN 10088-3, EN 10272
Certificates
Status according to EN 10 204 3.1
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)
| Proof strength | Tensile strength | Elong. | HB |
|---|---|---|---|
| Rp0.2a) | Rm | Ab) | |
| MPa | MPa | % | |
| ≥220 | 500-750c) | ≥35 | ≤220 |
| Proof strength | Tensile strength | Elong. | Hardness |
|---|---|---|---|
| Rp0.2a) | Rm | Ab) | Rockwell C |
| ksi | ksi | % | |
| approx. | |||
| ≥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, Sandvik 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).
Welding
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)