Super Duplex Steel S32750 Sheets & Plates

Super Duplex Steel S32750 Sheets & Plates Supplier in Mumbai, India - ASTM A240 UNS S32750

Nicorex Alloys is an ISO 9001/ISO 14001-certified supplier of Super Duplex S32750 sheets and plates based in Mumbai, India. UNS S32750 (Werkstoff 1.4410, EN X2CrNiMoN 25-7-4), also known as SAF 2507, is a high-performance flat product manufactured to ASTM A240 / ASME SA240.

A balanced 50/50 austenite-ferrite microstructure with 25% Cr, 4% Mo, 7% Ni, and 0.27% N delivers a PREN ≥ 40 (typical ~42) and a critical pitting temperature (CPT) of ~65°C in 1M NaCl. Our Super Duplex Grade F53, as per ASTM A182, has a minimum yield strength of 550 MPa and a tensile strength of 800 MPa. Our material meets the requirements of NACE MR0175 and is ferromagnetic with a density of 7800 kg/m³. Our material maintains its strength properties up to a melting point of 1350°C and has a maximum hardness of 32 HRC.

We supply Super Duplex S32750 sheets and plates in a wide size range for demanding seawater and high-pressure applications. Sheets are 0.5-6 mm thick and plates 6-80 mm, with widths from 1000 to 2500 mm and lengths up to 6000 mm. Available forms include hot rolled plate, cold rolled sheet, strip, coil, chequered and perforated plate, plus clad plate to ASTM A264. Material is solution annealed and pickled for optimal corrosion resistance and mechanical properties. Standard finishes are No.1, 2B, 2D, and BA. Each delivery includes EN 10204 3.1 MTC, PMI testing, and full traceability.

Super Duplex S32750 Sheet & Plate Specifications

Key specifications for Super Duplex S32750 sheets and plates are provided below, including applicable standards, thickness ranges, available widths, material condition, surface finishes and hardness limits.

Standard	ASTM A240 / ASME SA240
Sheet Thickness	0.5 – 6.0 mm
Plate Thickness	6.0 – 80 mm
Width	1000, 1250, 1500, 2000, 2500 mm
Condition	Solution Annealed & Pickled
Finish	No.1 (HR), 2B, 2D, BA
Hardness	≤310 HB / 32 HRC

Chemical Composition of Super Duplex S32750 Sheet & Plate

The chemical composition of Super Duplex S32750 sheet and plate (as per ASTM A240) has more chromium, nickel, molybdenum and nitrogen, which improves its overall performance.

Element	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Nitrogen (N)	Carbon (C)	Manganese (Mn)	Sulphur (S)	Iron (Fe)
S32750 (wt%)	24.0 – 26.0	6.0 – 8.0	3.0 – 5.0	0.24 – 0.32	0.030 max	1.20 max	0.020 max	Balance

Higher Cr (25% vs 22%), Mo (4% vs 3%), and N (0.27% vs 0.18%) push S32750 above PREN 40. PREN = %Cr + 3.3×%Mo + 16×%N. Typical: 25 + 3.3×4.0 + 16×0.27 = 42.5. Nitrogen strengthens austenite for strong HAZ toughness in thick plate welds.

Mechanical Properties of ASTM A240 Super Duplex S32750 Sheet & Plate

The mechanical properties of ASTM A240 Super Duplex S32750 sheet and plate demonstrate exceptional strength and toughness.

Property	Yield 0.2% Offset	Tensile Strength	Elongation	Hardness (max)	Impact, Charpy RT
ASTM A240 Min	550 MPa (80 ksi)	800 MPa (116 ksi)	15%	310 HB	–
Typical	620 MPa	870 MPa	25%	–	162 ft-lbs

Yield at 550 MPa allows a thinner plate in pressure vessels, cutting weight on offshore equipment. Impact holds to –50°C (140 ft-lbs at –40°F, 110 ft-lbs at –76°F).

Super Duplex S32750 Sheet & Plate Equivalent Grades

Super Duplex S32750 is internationally recognised under multiple equivalent standards and designations, including UNS S32750.

Standard	UNS	EN	Werkstoff
Designation	S32750	X2CrNiMoN 25-7-4	1.4410

Physical Properties of Super Duplex S32750 Sheets & Plates

The physical properties of Super Duplex S32750 sheets and plates highlight their strong structural stability and thermal performance.

Property	Density	Melting Point	Elastic Modulus	Thermal Conductivity	Thermal Expansion (20–100°C)	Magnetic
Value	7800 kg/m³ (0.28 lb/in³)	~1350°C (2462°F)	200 GPa	17 W/m·K	13.0 µm/m/°C	Yes (ferromagnetic, ~50% ferrite)

This steel expands less with heat (13.0 vs 16.0 µm/m/°C for 316L), making large welded plates stay flat and suffer less distortion.

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Available Forms of Super Duplex S32750 Sheet & Plate

S32750 flat products from Nicorex Alloys:

Super Duplex S32750 Hot Rolled Plate

Super Duplex S32750 Cold Rolled Sheet

Super Duplex S32750 Strip & Coil

Super Duplex S32750 Chequered Plate

Super Duplex S32750 Perforated Sheet

Super Duplex S32750 Clad Plate

Corrosion Resistance of Super Duplex S32750 Sheet & Plate

S32750 plates resist pitting up to ~65°C in 1M NaCl and crevice corrosion to ~35°C in 10% FeCl₃, about twice Duplex 2205. They show excellent chloride stress corrosion cracking resistance. In dilute H₂SO₄ + chloride, Alloy 2507 beats 904L. The grade is NACE MR0175 compliant.

Note: S32750 is susceptible to hydrogen embrittlement due to the ferritic phase. This limits H₂ storage and cathodic protection use unless hardness is per NACE MR0175.

Hot Working, Cold Forming & Heat Treatment of Super Duplex S32750

Hot form at 1020-1230°C. Solution anneal at ≥1100°C + rapid water quench. Cold forming needs higher forces than Duplex 2205, an intermediate anneal for severe work. Weld by GTAW, SMAW, or SAW using Zeron 100X matching filler (Cu + W). ERNiCrMo-14 for dissimilar joints. Ar + N₂ shielding. Interpass ≤100°C. No preheat or PWHT. ASTM A923 testing is recommended post-weld.

Industries using Super Duplex S32750 Sheet & Plate

Following are some of the industries where Super Duplex S32750 Sheet &Plate are applicable

Offshore Oil & Gas: Subsea manifold housings, Xmas tree parts, separator vessels. CPT ~65°C handles seawater.
Desalination: High-pressure RO vessels, evaporator shells, brine heaters. Handles >20,000 ppm chloride.
Chemical Processing: Reactors, heat exchangers for dilute HCl and H₂SO₄ + Cl⁻.
Pulp & Paper: ClO₂ bleaching equipment, acid recovery vessels.
Power (FGD): Scrubber shells, absorber towers in chloride flue gas condensate.

How to order Super Duplex S32750 Sheet & Plate

Provide the requirements mentioned below to order:

Product Form - Sheet / Plate / Coil / Strip / Chequered / Perforated / Clad
Specification - ASTM A240 UNS S32750
Thickness - Thickness (mm) and tolerance
Width × Length - Width × Length (mm)
Quantity - kg, MT, pieces
Condition - Solution Annealed + Pickled
Surface Finish - No.1, 2B, BA, PVC-coated
Edge - Mill / Slit
Testing - MTC per EN 10204/3.1, PMI, ASTM A923, Charpy impact at -46°C, UT per SA578, NACE
Packaging - Export crates, moisture barriers, Norsok MDS D56 if required
Delivery - Ex-works Mumbai / FOB / CIF

Frequently Asked Questions

What is the price of Super Duplex S32750 sheet and plate per kg in India?

In India, Super Duplex S32750 sheet and plate typically cost ₹500-1,200 per kg. European-origin material is about 30-50% costlier and usually 40-60% more expensive than Duplex 2205.

What ASTM standard covers Super Duplex S32750 sheet and plate?

Super Duplex S32750 sheets and plates are covered by ASTM A240 / ASME SA240, while forgings use ASTM A182 F53.

What is the PREN of Super Duplex S32750?

The PREN of Super Duplex S32750 is at least 40, typically about 42.5, which is roughly 20% higher than Duplex 2205 (PREN around 35).

Can Super Duplex S32750 plate withstand seawater?

Yes, Super Duplex S32750 plate can safely handle seawater. Its high CPT (~65°C) and excellent resistance to pitting, crevice corrosion and biofouling make it suitable.

What is the maximum service temperature for S32750 plate?

The safe service temperature range for S32750 plate is -50°C to +300°C. Above 300°C, harmful phases form and make the material brittle.