If your project needs material with high mechanical strength, plus great resistance to pitting, crevice corrosion and stress corrosion cracking (SCC), our UNS S32950 super duplex round bar is the perfect choice.

It has a PRE value over 40, performing much better than regular duplex grades like 2205, especially in chlorine-rich corrosive environments.

Unlike common austenitic stainless steel, UNS S32950 offers nearly double the yield strength. This helps clients cut down structural weight significantly.

It's widely used for offshore platforms, chemical processing vessels, marine projects and high-pressure seawater systems.

Product Details

Key Features & Advantages

Our Super Duplex UNS S32950 Round Bars comply with ASTM A276, A479, and ASME SA479 standards. The balanced duplex microstructure (approximately 50% ferrite / 50% austenite) provides the following verified characteristics:

High Yield Strength (≥ 550 MPa / 80 ksi): Reduces material weight without compromising design integrity.
Critical Pitting Temperature (CPT) > 60°C: Resists localized attack in warm chloride solutions, including seawater and brine.
Low Carbon Content (≤ 0.03%): Minimizes intergranular carbide precipitation during welding or thermal processing.
Alloy Composition (Key Elements): Chromium (28–29%), Nickel (3.5–5.2%), Molybdenum (1.0–2.0%), Nitrogen (0.2–0.3%).

Applications

Super Duplex Steel UNS S32950 Round Bar is widely applied in:

Marine Engineering: Propeller shafts, rudder stocks, seawater pump shafts.
Chemical Tankers: Cargo pump shafts, valve stems in chlorinated media.
Desalination Plants: High-pressure piping components and structural supports.
Flue Gas Desulfurization (FGD): Fan shafts and agitator shafts in wet scrubber environments.
Hydrocarbon Processing: Heat exchanger tie rods, expansion joint bolts.

Product Specifications & Technical Data

General Information

Item	Details
Product Name	Super Duplex Steel UNS S32950 Round Rod / Super Duplex Steel UNS S32950 Round Bar
Standard	ASTM A276, ASTM A479, EN 10272
Material Type	Super Duplex Stainless Steel
Form	Round Rod / Round Bar
Diameter	6 mm – 450 mm
Length	1 m – 6 m (custom lengths available)
Tensile Strength	≥ 750 MPa
Yield Strength (0.2% Offset)	≥ 550 MPa
Elongation	≥ 25%
Hardness (HB)	≤ 310
Surface Finish	Black, Pickled, Polished, Turned
Delivery Condition	Hot Rolled, Forged, Cold Drawn, Machined

Chemical Composition (%)

Element	Content
Chromium (Cr)	24.0 – 26.0
Nickel (Ni)	6.0 – 8.0
Molybdenum (Mo)	2.5 – 3.5
Nitrogen (N)	0.20 – 0.30
Manganese (Mn)	≤ 1.20
Silicon (Si)	≤ 1.00
Carbon (C)	≤ 0.03
Phosphorus (P)	≤ 0.03
Sulfur (S)	≤ 0.02
Iron (Fe)	Balance

Why Choose Our Super Duplex S32950 Round Bars?

Many suppliers offer duplex products, but few maintain consistent quality across Super Duplex Steel UNS S32950 Round Bars with full dimensional precision. Here is how we address real-world engineering needs:

1. Proven Resistance in Sour Service

For oil & gas extraction with H₂S and CO₂ present, our round bars resist sulfide stress corrosion cracking (SSCC) per NACE MR0175/ISO 15156-3. This makes them a reliable choice for downhole tooling and subsea manifolds.

2. Precision Tolerances for Machining

Each bar is centerless ground or peeled, offering tight diameter tolerances (h9/h11). Whether you need turned, ground, or polished finishes for shafts or fasteners, our material minimizes post-processing waste.

3. Full Traceability & Testing

We provide:

Intergranular corrosion test (ASTM A262 Practice E).
Ferrite content measurement (per ASTM E562).
Ultrasonic (UT) or eddy current examination on request.

Quality Assurance & Certification

We maintain stock of Super Duplex S32950 Round Bars in diameters ranging from 6 mm to 350 mm, in random lengths of 3–6 meters or cut-to-size. Every shipment includes:

EN 10204 3.1 mill certificate with actual chemistry and tensile results.
NACE MR0175 certification for sour service grades.
Positive material identification (PMI) verification prior to dispatch.
Third-party inspection allowance (SGS, TÜV, BV, or Lloyds).

Our facility is ISO 9001:2015 certified, with documented quality procedures from melt to final dispatch. No subbed-out processing-full in-house control.

FAQ

Q: What is the delivery status of UNS S32950 round bar? Do you support cutting to length?

A: The standard delivery status is solution annealing+water quenching (certified by ASTM A276/A479), and the surface can be selected from pickling, peeling or bright grinding. We support cutting to length, and the diameter from 6mm to 350mm can be cut according to the length you need, and the ends are deburred and marked by code spraying, without your secondary processing.

Q: Can you provide small batch samples or trial orders?

A: Sure. We support minimum order quantity as low as 1 piece (specific diameter range).

Q: Do you have stock?

A: Yes. Common diameters from 10 mm to 200 mm ship within 24–48 hours.

Q: What is the PRE value of UNS S32950?

A: Typical 38–40. Good for chloride environments like seawater and brine.