Seamless Super Duplex Steel UNS S32950 Pipe

UNS S32950|1.4655|S32950 Seamless Super Duplex Steel Pipe

UNS S32950 seamless super duplex stainless steel pipe for selected chloride-bearing, marine, heat-exchanger and chemical process service. Supply to ASTM A790 / ASME SA790 requirements is reviewed by dimensions, heat treatment, testing, fluid chemistry and project documentation.

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What Is UNS S32950 Seamless Pipe?

UNS S32950 Seamless Super Duplex Pipe Overview

UNS S32950 seamless pipe (super duplex stainless steel grade S32950) is a super duplex stainless steel pipe designed for high mechanical strength and resistance to pitting, crevice corrosion and chloride-induced stress-corrosion cracking. Seamless construction is commonly selected where pressure integrity and uniform wall structure are important.

Product item	Technical information
Product	UNS S32950 seamless super duplex stainless steel pipe
Alternative designation	super duplex stainless steel grade S32950
Primary standards	ASTM A790 / ASME SA790; project requirements subject to review
Key alloy feature	Higher chromium with nickel, molybdenum and nitrogen; grade selection should be based on the specified service environment
Typical service	Industrial chloride systems, marine equipment, heat exchangers and chemical process piping
Supply basis	Grade, OD, wall thickness, length or schedule, heat treatment and inspection requirements

Chemical Composition of UNS S32950

Values below are an engineering reference. Contractual limits must follow the governing standard, edition and purchase order.

Grade	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu / W
S32950	≤0.03	≤2.00	≤0.035	≤0.010	≤0.60	3.50–5.20	26.00–29.00	1.00–2.50	0.15–0.35	Project specification

Mechanical Property Reference

	Tensile strength	Yield strength	Elongation	Hardness
Reference value	≥795 MPa	≥550 MPa	≥25%	≤290 HBW
Procurement note	Indicative product data; verify acceptance values against the applicable standard and MTC.	Confirm the required product condition and wall thickness.	Test requirements depend on the governing specification.	Use the ordered standard and project limits.

Manufacturing, Testing and Documentation

Item	Available scope
Manufacturing route	Hot piercing or extrusion, cold drawing/pilgering where required, solution annealing, straightening and finishing
Dimensional control	OD, wall thickness, length, straightness and surface inspection against the purchase specification
Integrity testing	Hydrostatic or nondestructive electric testing; UT or eddy-current testing when specified and applicable
Documents	Material Test Certificate, chemical and mechanical results, dimensional report and additional inspection records as ordered
Optional verification	PMI, corrosion testing and third-party inspection subject to technical and contractual review

Typical Applications

Industry	Typical equipment or service	Selection focus
Chemical processing	Process piping and heat-transfer equipment	Strength and corrosion resistance
Marine systems	Seawater and brackish-water piping	Resistance in chloride-bearing media
Heat exchangers	Pressure-bearing process circuits	High strength and dimensional control
Industrial water	High-pressure chloride service	Grade-specific corrosion performance

Super Duplex Grade Comparison

Grade	Key distinction	Typical selection focus
S32550	Copper-bearing Ferralium 255	Acidic chemical and seawater duties
S32750	Widely specified Alloy 2507 / F53	Offshore, desalination and chloride service
S32760	Tungsten- and copper-alloyed F55	Severe offshore and erosive service
S32950	Higher chromium, leaner molybdenum range	Selected industrial chloride environments

Information Required for a Quotation

Requirement	Information to specify
Material	UNS S32950 and governing standard
Dimensions	OD × wall thickness × length or NPS × schedule
Quantity	Number of pieces or total weight
Condition	Heat treatment, surface finish, ends and packing
Inspection	MTC, NDT, PMI, corrosion testing or third-party inspection
Logistics	Destination and required delivery date

Frequently Asked Questions

What is UNS S32950 seamless pipe?

UNS S32950 is a high-chromium super duplex stainless steel grade used for high-strength piping in selected chloride-bearing, marine and chemical process environments. Suitability must be checked against temperature, fluid chemistry and the governing design code.

Which standard is commonly specified?

ASTM A790 / ASME SA790 is commonly used for seamless and welded ferritic-austenitic stainless steel pipe. State the exact edition, dimensions and supplementary requirements in the purchase order.

What information is needed for quotation?

Send the grade, standard, OD, wall thickness, length, quantity, delivery condition, inspection requirements and destination for technical review.

See the complete Super Duplex Stainless Steel Seamless Pipe range. Final availability, testing scope and compliance are subject to formal review of the standard, drawing and purchase order.

Ready to Request a Quotation?

Send your UNS S32950 Seamless Pipe enquiry with grade, applicable ASTM/ASME standard and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.

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