Super Duplex Steel S32950 (F52) Round Bar
- Home
- Round Bar
- Super Duplex Round Bar
- Super Duplex Steel S32950 (F52) Round Bar
Super Duplex Steel S32950 (F52) Round Bar Supplier in India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified dealer and supplier of Super Duplex stainless steel bar and rod products, operating from Mumbai, India. We supply S32950 round bars manufactured to ASTM A276 and ASTM A479 / ASME SA276 and SA479 standards. UNS S32950 also called F52 round bar and traded under the name 7-Mo Plus.
This alloy contains 26-29% chromium, 3.5-5.2% nickel, 1.0-2.5% molybdenum, and 0.15-0.35% nitrogen. This nickel-lean composition works excellently in terms of chloride resistance at a lower cost. F52 round bars contain remarkable mechanical properties that let you save weight in structural designs. Its Minimum yield strength reaches 485 MPa (70 ksi), minimum tensile strength hits 690 MPa (100 ksi), and the PREN falls in the 34-38 range, giving this grade strong pitting and crevice corrosion performance in seawater and chloride-bearing process streams. Such round bars are used in structures that require more durability.
Diameters range from 6 mm to 300 mm in round, hex, flat, square, bright, and forged bar forms, with lengths from 1 to 6 metres.S32950 bars are manufactured according to several international standards, including ASTM A182 and ASTM A276/A479. These round bars are widely utilised in industrial sectors such as oil and gas, petrochemical processing, and marine engineering due to their superior yield strength.
Super Duplex Stainless Steel UNS S32950 Bar and Rod Specifications
S32950 bar from Nicorex Alloys is supplied according to the following standards and size configurations.
| Standards | ASTM A276, A479, ASME SA276, SA479 |
|---|---|
| Forging Grade | ASTM A182 F52 |
| Diameter Range | 6 mm – 300 mm |
| Length | 1 – 6 metres, custom cut |
| Forms | Round, Hex, Flat, Square, Bright, Black, Forged, Hollow |
| Finish | Hot Rolled, Cold Drawn, Centreless Ground, Peeled |
| Condition | Solution Annealed |
Chemical Composition of SDSS UNS S32950 Round Bar
The S32950 chemical composition per ASTM A276 features a higher chromium range (26-29%) than most Super Duplex grades, with controlled nitrogen for phase stability.
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|
| Percentage (%) | 0.030 max | 2.00 max | 0.60 max | 0.035 max | 0.010 max | 26.0–29.0 | 3.50–5.20 | 1.00–2.50 | 0.15–0.35 | Balance |
S32950 uses a nickel-lean approach with elevated chromium and nitrogen to hold a 50:50 austenite-ferrite balance. This cuts raw material cost versus S32750 while keeping chloride resistance above standard Duplex 2205 in most media.
Mechanical Properties of Super Duplex UNS S32950 (F52) Bar
The S32950 mechanical properties below apply to bars in solution annealed conditions as per ASTM A276. This grade delivers higher yield and tensile strength than austenitic grades while providing better ductility than martensitic steels.
| Property | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) | Reduction of Area (min) |
|---|---|---|---|---|---|
| Value | 690 | 485 | 15 | 293 | 45 |
| Unit | MPa (100 ksi) | MPa (70 ksi) | % | HBW (31 HRC) | % |
The 45% minimum reduction of area shows strong ductility for a Super Duplex grade, beneficial for cold forming and machining on bar stock.
Super Duplex Steel S32950 Equivalent Grades
S32950 has fewer international equivalents than widely used Super Duplex grades, as it fills a niche between standard and Super Duplex performance tiers.
| Standard / System | UNS | DIN | Werkstoff Number |
|---|---|---|---|
| Designation | S32950 | X10CrNiMoCuN25-6-3 | 1.4410 |
No widely recognised Werkstoff Nr. or EN equivalent exists. Specify by UNS designation S32950 for international procurement.
Physical Properties of Super Duplex Steel S32950 Bar
Physical properties of S32950 bar stock are relevant for machining, thermal design, and weight estimation.
| Property | Density | Melting Range | Thermal Conductivity (20°C) | Specific Heat | Electrical Resistivity | Thermal Expansion (20–100°C) | Elastic Modulus |
|---|---|---|---|---|---|---|---|
| Value | 7.83 | 1350–1425 | 15.0 | 475 | 0.80 | 12.8 × 10⁻⁶ | 200 |
| Unit | g/cm³ | °C | W/m·K | J/kg·K | µΩ·m | /°C | GPa |
Premium Industrial Materials
Get Super Duplex S32950 Bars
at Competitive Prices
ISO Certified
Custom Sizes
Fast Delivery
Available Forms of Super Duplex Steel UNS S32950 Bar
Nicorex Alloys stocks S32950 bar in the following forms for machining, fabrication, and structural use.
SDSS S32950 Round Bar
Super Duplex UNS S32950 Bright Bar
UNS S32950 Hex Bar
S32950 Super Duplex Flat Bar
SDSS UNS S32950 Rod.
UNS S32950 Forged Bar
Super Duplex S32950 Hollow Bar
S32950 Rectangular Bar
Industries and Applications for Super Duplex S32950 Bar and Rod
The high-chromium, nickel-lean composition of S32950 positions this bar grade as a cost-effective alternative to full Super Duplex in moderately aggressive environments.
- Pump shafts, agitators, valve stems, and reactor internals in chloride-bearing and mixed-acid streams. The 26–29% Cr content resists organic acids (formic, acetic) and dilute inorganic acids where 2205 lacks pitting resistance but S32750 cost is not justified.
- Platform pipework, manifold bodies, subsea risers, and ballast water components. S32950 bar provides the PREN and SCC resistance needed for seawater-exposed service. For sour service (H₂S), verify compliance with NACE MR0175 / ISO 15156-3.
- Propeller shafts, hull fittings, valve bodies, and structural fasteners. The combination of 690 MPa tensile and seawater corrosion resistance at a density of 7.83 g/cm³ delivers weight savings over austenitic alternatives in naval construction.
- High-pressure reverse osmosis frames, brine handling shafts, and evaporator components. The PREN of ~37 suits the high-chloride, elevated-temperature conditions of desalination service.
- FGD equipment shafts, condenser bolting, and cooling water piping components. Duplex strength allows thinner cross-sections for reduced weight in large piping systems.
How to Order UNS S32950 Round Bar and Rod from Nicorex Alloys
Provide the following information to order:
- Bar Form - Round Bar, Hex Bar, Flat Bar
- Diameter - Diameter × Length in mm or inches
- Material Grade - Super Duplex S32950 / UNS S32950 / F52
- Standard - ASTM A479 / ASME SA479
- Surface Finish - Black, Bright, Polished, Centreless Ground, Peeled
- Condition - Solution Annealed / Solution Treated & Precipitation Hardened
- Tolerance - h9, h11 or as per requirement
- Quantity - number of pieces, kg, or MT
- Additional Requirements - NACE MR0175 compliance, HIC/SSC testing, specific heat numbers, offshore / subsea service
- Documentation - MTC 3.1 per EN 10204, PMI report, third-party inspection certificate
- Packaging - Standard wooden box / export-grade sea-worthy packing / ISPM 15 compliant
- Delivery Destination - Domestic / international
Contact Nicorex Alloys for stock check, pricing, and delivery schedule, Custom sizes available on request.
Frequently Asked Questions
What is the Price of S32950 Round Bar per kg in India?
In India, the price of S32950 round bars is usually between ₹650 and ₹1,200 per kg. S32950 costs less than Super Duplex S32750 because it has less nickel and molybdenum. Prices vary depending on the size, finish, and any extra charges for the alloy.
What Is 7-Mo Plus Stainless Steel?
7-Mo Plus is the trade name assigned by Carpenter Technology Corporation for UNS S32950. It corresponds to ASTM A276/A479 UNS S32950 and A182 F52 for forgings.
What is the Maximum Operating Temperature for S32950 Bar?
The S32950 round bar works best when the temperature is below 300°C (572°F). When the temperature goes above this, the risk of embrittlement and sigma phase precipitation goes up. This makes the material less tough and more likely to corrode.
What are the Advantages of S32950 Over Austenitic 316L?
S32950 is thinner and lighter than S32950 because it has about twice the yield strength (485 MPa vs. 205 MPa). It also holds up better against chloride stress corrosion cracking. S32950 has a lot more chromium (26–29% vs. 16–18%), which makes it much less likely to pit.
Can S32950 Bar be Machined on Standard CNC Equipment?
Yes. S32950 is machinable on standard CNC lathes and mills with carbide tooling. Machinability rates at ~60% of free-machining steel (AISI 1212). Reduce cutting speeds 30–40% versus 316L and use flood coolant to manage work hardening.