What steel grade is equivalent to 1.4563?

1.4563 (Alloy 28 / UNS N08028) is a high‑nickel super‑austenitic corrosion‑resistant alloy. Thanks to balanced Cr‑Ni‑Mo‑Cu alloying system, it performs well in both oxidizing and reducing acid‑chloride mixed environments, outperforming conventional austenitic steels and many duplex grades in phosphoric‑sulfuric acid service.

It offers good resistance to pitting, crevice corrosion and chloride‑induced stress‑corrosion cracking. Welding can be carried out with matching nickel‑base filler metals; no post‑weld heat‑treatment is needed for qualified welding procedures.

 

Equivalent Grades of 1.4563 stainless steel

Standard	Grade
EN European	1.4563 / X1NiCrMoCu31‑27‑4
ASTM / UNS	Alloy 28 / UNS N08028
Chinese GB	00Cr27Ni31Mo3Cu (near equivalent)

Available forms: seamless & welded tubes, plates, sheets, round bars, forgings, flanges, fittings.

 

Chemical Composition (mass fraction %, EN 10088‑3) of 1.4563 stainless steel

Element	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N
Content	≤0.020	≤0.70	≤2.00	≤0.030	≤0.010	26.0‑28.0	30.0‑32.0	3.0‑4.0	0.7‑1.5	≤0.10

Ultra‑low carbon minimizes intergranular‑corrosion risk after welding. Copper improves resistance to reducing acids such as sulfuric and phosphoric acid; chromium‑molybdenum delivers good pitting‑crevice corrosion resistance in chloride‑containing media. PREN ≈32‑36.

 

Mechanical Properties of 1.4563 stainless steel

Property	Value
Tensile Strength Rm	≥650 MPa
0.2% Offset Yield Strength Rp0.2	≥250 MPa
Elongation A	≥40 %
Brinell Hardness HBW	≤215

Not hardenable by heat treatment; strength improvement only via cold working. Solution‑annealing range: 1100‑1160 ℃, rapid water‑cooling required.

 

Physical Properties (20 ℃) of 1.4563 stainless steel

Item	Parameter
Density	8.00 g/cm³
Modulus of Elasticity	195 GPa
Coefficient of Linear Expansion	15.8×10⁻⁶ /℃ (20‑100℃)
Thermal Conductivity	12.0 W/(m·K)
Specific Heat Capacity	450 J/(kg·℃)
Melting range	1350‑1370 ℃
Microstructure	fully austenitic, non‑magnetic
Max continuous service temperature	≤450 ℃

1.4563 stainless steel provides exceptional pitting and crevice corrosion resistance. With a PREN value greater than 40, the material delivers superior anti-corrosion performance under aggressive chloride conditions, such as hot seawater and concentrated brine solutions.

 

Can 1.4563 stainless steel resist stress corrosion cracking in corrosive environments?

Yes. 1.4563 stainless steel possesses excellent stress corrosion cracking (SCC) resistance. It remains stable under tensile stress and harsh corrosive conditions, where ordinary austenitic stainless steels are prone to failure.

 

What are the processing performances of 1.4563 stainless steel in welding and forming?

1.4563 stainless steel features good weldability and formability. It can be welded with conventional welding techniques. Meanwhile, it maintains excellent ductility, supporting various cold forming and shaping processes.

1.hemical & fertilizer industry

Wet‑process phosphoric acid evaporators, concentrators, heat exchangers and sulfuric‑acid process piping for media containing sulfuric acid, phosphoric acid, fluorides and chlorides. It is a proven material for phosphoric‑acid production unitsAlleima.

2.Flue‑gas desulfurization (FGD)

Power‑plant scrubbers, ductwork and chimney liners against highly corrosive flue‑gas environments.

3. Oil‑gas & marine engineering

Sour‑service downhole tubing, well‑head components, seawater heat‑exchangers and desalination process piping for brine and H₂S‑containing mediaAlleima.

4.Pulp & paper industry

Bleaching‑stage equipment and digester liquor recovery systems for corrosive bleaching media.

5.Hydrometallurgy

Leaching tanks, electrolytic equipment and process piping for corrosive ore‑slurry service.

6.Pharmaceutical & fine‑chemical sector

High‑purity reactors and process piping for corrosive cleaning media.

How does 1.4563 compare to 254 SMo (1.4547)?
Both are super austenitic grades, but 1.4563  contains higher chromium and nickel levels, giving it better overall corrosion resistance, especially in mixed acid-chloride environments. It also offers slightly higher mechanical strength.1.4563 is often chosen for more severe corrosive applications where both pitting resistance and general corrosion resistance are critical.

 

What are the welding considerations for1.4563 stainless steel?
Welding 1.4563 requires careful control to maintain corrosion resistance. Recommended practices include using matching or over-alloyed filler metals (such as Alloy 625 or higher-grade austenitic fillers), controlling heat input to avoid excessive intermetallic phase formation, and ensuring proper shielding to prevent nitrogen loss. Post-weld cleaning is essential to preserve corrosion resistance in the weld zone.