Super Duplex Steel Products Manufacturer & Supplier in India

Q: Can Super Duplex steel be used in low-temperature environments?

Yes, Super Duplex stainless steel has good toughness at sub-zero temperatures. However, it is generally restricted to temperatures above -50°C to minimize the risk of brittle fracture.

Q: Is Super Duplex harder to weld than standard stainless steel?

Super Duplex stainless steel requires specific welding procedures and suitable filler materials to maintain the ideal 50/50 austenite-ferrite microstructure. With proper technical expertise, it is highly weldable.

Super Duplex Steel Products Manufacturer & Supplier in India

Super Duplex Stainless Steel Products are designed to provide superior strength, excellent corrosion resistance and excellent performance under extreme environments. Super duplex steel is a hi-tech austenitic-ferritic iron-chromium-nickel alloy containing molybdenum and high-resistance rates against stress corrosion cracking are much higher than those of typical austenitic stainless steel.

Solitaire Overseas is a reputed manufacturer and supplier of Super Duplex Steel Products in India where we have a complete line of products such as Super Duplex Steel Pipes and Tubes, Super Duplex Steel Flanges and Super Duplex Steel Fittings. We produce our products, which meet international standards and are supplied in such grades as UNS S32750, UNS S32760, and UNS S32950 to fulfill the strict industrial demands.

Super Duplex Steel is highly corrosive resistant and has outstanding mechanical strength, thereby making them ideal in onshore and offshore oil and gas that require resistance to pitting, crevice corrosion and chloride induced stress corrosion cracking. One of the applications of Super Duplex pipeline supplies is in aggressive environments which guarantees them long service life and low maintenance costs.

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Super Duplex Steel Specifications

Item	Specification
Common Grades	UNS S32750 (2507), UNS S32760, UNS S32950
Equivalent Standards	ASTM A182 F53 / F55, DIN 1.4410 / 1.4501
Product Standards	ASTM A790 (Pipes), ASTM A789 (Tubes), ASTM A240 (Plates/Sheets), ASTM A182 (Flanges/Forgings), ASTM A276 / A479 (Bars), ASTM A815 (Buttweld Fittings), EN 10088-3
Dimensional References	ASME B36.19M, ASME B16.5, ASME B16.47, ASME B16.9, ASME B16.11
Finishes / Condition	Hot Rolled, Cold Drawn, Pickled & Passivated, Polished, Solution Annealed
Documentation	EN 10204 3.1 / 3.2 MTC, PMI Reports, Heat Charts
Testing (Optional)	ASTM A923, ASTM G48 Method A, UT / ET, Hydrostatic Testing
Tolerances	As per ASTM / ASME / EN standards; tight tolerances & cut lengths on request

Super Duplex Steel Chemical Composition

Element	C	Mn	Si	P	S	Cr	Ni	Mo	N
UNS S32750	≤0.03	≤1.20	≤0.80	≤0.035	≤0.020	24.0–26.0	6.0–8.0	3.0–5.0	0.24–0.32
UNS S32760	≤0.03	≤1.00	≤1.00	≤0.030	≤0.010	24.0–26.0	6.0–8.0	3.0–4.0	0.25–0.35
UNS S32950	≤0.03	≤1.50	≤1.00	≤0.035	≤0.020	26.0–29.0	4.5–6.5	2.5–4.0	0.15–0.30

Super Duplex Steel Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness
UNS S32750 (2507)	≥800	≥550	≥15	≤32 HRC
UNS S32760	≥750	≥550	≥15	≤32 HRC
UNS S32950	≥760	≥550	≥15	≤32 HRC

Super Duplex Steel Products Applications

Super Duplex steel is the preferred material for environments where standard duplex or stainless steel fails:

Desalination Plants: High-pressure RO piping and seawater handling.
Oil & Gas: Subsea manifolds, flowlines, and heat exchangers.
Marine Engineering: Propeller shafts, rudders, and seals.
Chemical Processing: Handling of highly corrosive organic and inorganic acids

Frequently Asked Questions About Super Duplex Steel Products

What is the main difference between Duplex and Super Duplex?

Super Duplex contains higher levels of Chromium, Molybdenum, and Nitrogen, resulting in a Pitting Resistance Equivalent Number (PREN) greater than 40. This makes it significantly more resistant to pitting and crevice corrosion than standard Duplex.

Can Super Duplex steel be used in low-temperature environments?

Yes, Super Duplex has good toughness at sub-zero temperatures, although it is generally restricted to temperatures above $-50^\circ\text{C}$ to avoid the risk of brittle fracture.

Is Super Duplex harder to weld than standard Stainless Steel?

It requires specific welding procedures and filler materials to maintain the 50/50 austenite-ferrite balance, but it is highly weldable with the correct technical expertise.