# Sanicro 28 Forgings, UNS N08028 / EN 1.4563

Source: https://steelforgepieces.com/Stainless-Steel/Sanicro-28.html
Manufacturer: Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory
Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Phone: +86-189-2135-9659 | Email: sales@steelforgepieces.com
Updated: October 2026

## Summary

Sanicro 28 is a high-alloy austenitic stainless steel, UNS N08028 and EN 1.4563
(X1NiCrMoCu31-27-4), with a nominal 27% Cr, 31% Ni, 3.5% Mo and 1% Cu, carbon
capped at 0.020%. It was developed for wet-process phosphoric acid plant and also
handles sulphuric, hydrochloric, hydrofluoric, formic and nitric acids,
chloride-bearing seawater and caustic soda.

Jiangyin Jiangnan Metal Co., Ltd. forges this grade to customer drawing as
seamless rolled rings, flanges, round bars, discs, sleeves, bushings, shafts,
tube sheets and valve bodies. Material is ESR melted, solution annealed at
1100-1160 C with water quench, ultrasonically tested to ASTM A388 or EN 10228-3,
and supplied with EN 10204 3.1 or third-party 3.2 certificates.

## Quick data

| Item | Value |
|---|---|
| UNS | N08028 |
| EN number / W.Nr. | 1.4563 |
| EN name | X1NiCrMoCu31-27-4 |
| DIN | X1NiCrMoCuN 31 27 4 |
| ISO | 4563-080-28-I |
| SS (Sweden) | 2584 |
| AFNOR | Z1NCDU31-27-03 |
| Other trade names | Sanicro 28, Alloy 28, Incoloy 28 |
| Density | 8.0 g/cm3 |
| PREN | about 38 to 39 |
| Solution anneal | 1100-1160 C, 10-30 min, water quench |
| Max service temperature | 600 C (1110 F) |

## Chemical composition, nominal, weight %

| Element | Nominal or limit |
|---|---|
| C | 0.020 max |
| Cr | 27 |
| Ni | 31 |
| Mo | 3.5 |
| Cu | 1.0 |
| Mn | 2.0 max |
| Si | 0.6 max |
| P | 0.025 max |
| S | 0.010 max |
| Fe | balance |

Nominal values from the Alleima Sanicro 28 bar datasheet. ASTM B668 purchase
bands are wider: Ni 30.0-34.0, Cr 26.0-28.0, Mo 3.0-4.0, Cu 0.6-1.4, C 0.030 max.

## Mechanical properties, solution annealed and quenched, 20 C

Bar, EN 10272 / EN 10088-3 basis:

| Property | Value |
|---|---|
| Rp0.2 | 220 MPa (32 ksi) min |
| Rm | 500-750 MPa (72-108 ksi) |
| Elongation A | 35% min |
| Hardness | 220 HB max |

Tube, pipe, plate and sheet, ASTM B668 / EN 10216-5 basis:

| Property | t up to 20 mm | t over 20 mm |
|---|---|---|
| Rp0.2 | 220 MPa (32 ksi) min | 200 MPa (29 ksi) min |
| Rp1.0 | 250 MPa (36 ksi) min | 230 MPa (33 ksi) min |
| Rm | 550-750 MPa (80-109 ksi) | 550-750 MPa (80-109 ksi) |
| Elongation A | 40% min | 40% min |
| Hardness | 90 HRB max | 90 HRB max |

Elevated temperature minimum values, t up to 20 mm:

| Temp C | Rp0.2 MPa | Rp1.0 MPa | Rm MPa |
|---|---|---|---|
| 100 | 190 | 220 | 510 |
| 200 | 160 | 190 | 440 |
| 300 | 150 | 180 | 390 |
| 400 | 135 | 165 | 370 |
| 500 | 120 | 150 | 350 |
| 550 | 115 | 145 | 340 |

Impact toughness: 60 J (44 ft-lb) min at -270 C to EN 13445-2 (UFPV-2), and
60 J (44 ft-lb) min at -196 C to EN 10216-5 and EN 10272.

## Physical properties

| Property | Value |
|---|---|
| Density | 8.0 g/cm3 (0.29 lb/in3) |
| Relative magnetic permeability | about 1.003, non-magnetic |
| Thermal conductivity, 20 C | 10 W/(m C) |
| Specific heat, 20 C | 460 J/(kg C) |
| Electrical resistivity, 20 C | 0.99 micro-ohm m |
| Mean thermal expansion, 30-300 C | 16 x 10-6 /C |

## Standards and approvals

| Product form | Standards |
|---|---|
| Seamless tube and pipe | ASTM B668, EN 10216-5, SEW 400, SS 14 25 84, NFA 49-217 |
| Plate, sheet and strip | ASTM B709, EN 10088-2, SS 14 25 84 |
| Bar and forging stock | EN 10088-3, EN 10272, SS 14 25 84 |
| Fittings | ASTM A403, chemistry and mechanicals to ASTM B668 |

Approvals: ASME Boiler and Pressure Vessel Code Section I (Code Case 1325-18),
Section III and Section VIII Division 1; VdTUV Werkstoffblatt 483;
NACE MR0103; NACE MR0175 / ISO 15156.

Note on specifying forgings: ASTM B668 covers seamless tube and pipe, so it is
not on its own the correct call-out for a forged ring, flange or disc. Use
EN 10272 or EN 10088-3 for forged bar, rings and discs, or ASTM A403 for
fittings with chemistry and mechanicals to B668.

## Corrosion performance

Phosphoric acid: the most widely used metallic material for evaporator tubes in
wet-process phosphoric acid plant, with service lives over ten years. In
contaminated 95% superphosphoric acid at 200 C over 20 days the corrosion rate
was 0.03 mm/year, against 0.10 mm/year for Alloy 904L and 0.23 mm/year for
UNS N08020.

Sulphuric acid: suitable for piping and heat exchangers, particularly 40-70%
deaerated acid and above 85%. Resistance in concentrated 98% acid is roughly
equal to Alloy C. In chloride-contaminated sulphuric acid above about 20%
concentration it performs better than super-duplex SAF 2507.

Other media: more resistant to hydrochloric acid than lower Cr-Mo stainless
steels; very good in hydrofluoric and hydrofluosilicic acid; far better than
316L and better than 904L in formic acid; below 0.15 mm/year in the ASTM A262
Practice C Huey test; considerably better than 304 and 316 in sodium hydroxide.

Pitting, crevice and SCC: critical pitting temperature in synthetic seawater is
higher than Alloy 904L and Alloy 825. In ASTM G48 Method B crevice testing it
outperformed Alloy 825. In boiling 43% NaOH plus 6.7% NaCl at 142 C for 500
hours it showed no cracking while Alloy 800 and Alloy 904L cracked. It also
resists SCC in combined H2S and chloride environments.

Intergranular corrosion: per ASTM G28, at least 30 minutes in the critical
600-700 C band without intergranular attack, longer than any normal weld cycle.

Limitations: in seawater specifically, super-duplex SAF 2507 is more resistant
than Sanicro 28. Avoid prolonged exposure above 600 C because of intermetallic
phase embrittlement.

## Heat treatment

Solution annealing at 1100-1160 C (2010-2120 F), hold 10 to 30 minutes, water
quench. Forged rings, discs and heavy shafts should always be water quenched.

## Forging route used for this grade

EAF melting, AOD or VOD refining, ESR remelting, controlled-temperature open-die
forging or ring rolling with sufficient reduction through the full section,
solution annealing and water quench, machining, then inspection.

## Machining and welding

Machining: reduce cutting speed by about 50 to 55% compared with Sanmac 316/316L
when turning with coated cemented carbide tooling. Reduce feed only slightly.

Welding: TIG/GTAW preferred, then MIG/GMAW and MMA/SMAW. Heat input below
1.0 kJ/mm, interpass temperature below 150 C, stringer bead technique.
Fillers: ISO 14343 S 27 31 4 Cu L / AWS A5.9 ER383 for TIG and MIG;
ISO 3581 E 27 31 4 Cu L R / AWS A5.4 E383-16 for MMA. No preheat required.

## Forged product forms available

Seamless rolled rings, flanges, round bars, discs and disks, sleeves, bushings,
shafts, eccentric shafts, tube sheets, forged tubes and hollows, valve bodies,
valve seat rings, valve stems, valve blocks, nozzles, gears, spindles, forged
blocks, rolls and wheels. Rough forged, proof machined or finish machined to
drawing. Single pieces and small batches accepted.

## Applications

Fertiliser and phosphoric acid plant, chemical and petrochemical processing,
sour oil and gas service, offshore and subsea equipment, pressure vessels and
shell and tube heat exchangers, nuclear power, valves, pulp and paper,
pharmaceutical and biochemical processing.

## Testing and certificates

Spectrometer chemical analysis with heat traceability, tensile and hardness
testing, Charpy impact testing on request, ultrasonic testing to EN 10228-3,
SEP 1921 or ASTM A388, PMI, dye penetrant examination, intergranular corrosion
testing to ASTM A262 Practice C or ASTM G28, dimensional inspection.
Certificates to EN 10204 3.1 as standard, or EN 10204 3.2 witnessed by TUV, BV,
SGS or Lloyd's.

## Pricing

Quoted per enquiry, based on drawing, weight, tolerance and certificate level.
No list price is published. Send a drawing or dimensions to
sales@steelforgepieces.com.

## Contact

Jiangyin Jiangnan Metal Co., Ltd.
No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
Phone, WhatsApp and WeChat: +86-189-2135-9659
Email: sales@steelforgepieces.com

Sanicro is a trademark of Alleima. Incoloy is a trademark of Special Metals.
Used here only to identify the grade. Technical data referenced from published
Alleima material datasheets for Sanicro 28 bar and seamless tube and pipe.