Super Duplex Stainless Steel Tube – 6.320" OD x 3.700" ID | 25CR | Seamless | 125 ksi Yield Strength | SS503S21 Compliant
Product Overview
The 6.320" OD x 3.700" ID seamless stainless steel tube, crafted from 25 Chrome Super Duplex (25Cr) and manufactured to SS503 specification with S21 supplement, delivers maximum strength and corrosion resistance. Its solution annealed and cold worked condition enhances fatigue life and structural integrity, making it ideal for aggressive service conditions including offshore platforms, high-pressure lines, and sour gas applications.
Key Features, Benefits & Advantages
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25Cr Super Duplex Stainless Steel
Combines high strength with superior resistance to chloride stress corrosion cracking and pitting.
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High Yield Strength – 125 ksi (861 MPa)
Exceeds typical stainless steel performance, reducing material weight while maintaining structural integrity.
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Seamless Tube Construction
Eliminates weld seam failure risk and improves integrity in dynamic or pressurized environments.
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Thick Wall – 1.31 in (33.27 mm)
Engineered for high-pressure containment and demanding cyclic loading conditions.
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SA-CW (Solution Annealed & Cold Worked)
Delivers exceptional toughness and hardness uniformity throughout the wall cross-section.
Technical Specifications
|
Parameter |
Value |
|
SKU / Item Number |
2969469 |
|
Material |
Stainless Steel – 25 Chrome Super Duplex |
|
Material Grade |
25Cr |
|
Specification |
SS503 |
|
Supplement |
S21 |
|
Condition |
Solution Annealed & Cold Worked (SA-CW) |
|
Outside Diameter (OD) |
6.320 in (160.528 mm) |
|
Inside Diameter (ID) |
3.700 in (93.98 mm) |
|
Wall Thickness |
1.31 in (33.274 mm) |
|
Yield Strength |
125 ksi (861.84 MPa) |
|
Weight per Unit Length |
70.094 lbs/ft (104.31 kg/m) |
|
Construction |
Seamless Tube |
|
Lifecycle Status |
Released |
|
Unit of Measure |
Inches |
Equipment Compatibility & Cross-Reference
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Ideal for Use In:
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Offshore risers and topside process systems
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HPHT (High Pressure High Temperature) injection and flowback systems
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Hydraulic tubing bundles in subsea trees and control systems
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Sour gas pipelines and downhole chemical injection lines
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Cross-Reference Designation:
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Legacy/Primary Part Number: 2969469
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Description: Tube, 6.320 OD x 3.700 ID, 25Cr SA-CW, SS503S21
Application & Industry Use
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Target Applications:
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HPHT tubing systems
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Sour service environments (H₂S, CO₂)
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Offshore production and midstream handling
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Pump-down and injection assemblies
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Industry Segments:
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Offshore & Subsea (TLPs, FPSOs)
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Upstream Production (Wellsite flowlines)
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Midstream Gathering (Condensate transfer)
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Petrochemicals & Specialty Fluids
Certifications & Compliance
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✅ Material Spec: SS503 with Supplement S21
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✅ Heat Treatment: Fully Solution Annealed and Cold Worked
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✅ Pressure Integrity: Seamless tubing structure eliminates weld seam issues
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✅ Corrosion Resistance: Suitable for high-chloride and sour gas service
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✅ Lifecycle Status: Actively Released
Ordering & Procurement Details
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Standard Lengths: Stock and cut-to-length options available
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Availability: Stocked at select strategic warehouse hubs
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MOQ: 1 tube or by footage – bulk quantity discounts available
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Shipping: Crate packed; custom packaging upon request
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Payment Terms: Net 30 / Net 60 available
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Certifications Provided: Full MTR with 25Cr content verification
Frequently Asked Questions (FAQ)
Q1: Can this tube be used in NACE MR0175 applications?
A: Yes. 25Cr Super Duplex is widely accepted in sour service, but final NACE compliance should be verified per project MDS.
Q2: Is welding this material recommended?
A: Special care must be taken with welding Super Duplex; consult AWS D1.6 or project-specific WPS/PQRs.
Q3: What’s the chloride threshold?
A: This tube tolerates up to ~1000 ppm Cl⁻ at ambient temp without pitting; always verify against environment conditions.
Q4: Can I get this tube with a different wall thickness?
A: Yes, multiple wall schedules and OD/ID combinations available on request.
Q5: Are third-party inspections supported?
A: Absolutely. We support BV, SGS, ABS, and DNV inspection and witnessing as required.
Call To Action (CTA)
🔍 Request a Quote for 25Cr Seamless Tube – SS503S21 Certified
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