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Quality ASTM A789 Duplex Stainless Steel Precision Pipe For Heat Exchangers Instrumentation Lines factory
Quality ASTM A789 Duplex Stainless Steel Precision Pipe For Heat Exchangers Instrumentation Lines factory

ASTM A789 Duplex Stainless Steel Precision Pipe For Heat Exchangers Instrumentation Lines

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
Tags

Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

Duplex Stainless Steel Precision Pipe
Product Summary
ASTM A789 Duplex Tubes Duplex Tube for Heat Exchangers and Instrumentation Lines

Product Details

Highlight:

Duplex Stainless Steel Precision Pipe

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ASTM A789 Stainless Steel Precision Pipe
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

ASTM A789 duplex tube is a standard specification for seamless and welded duplex stainless steel tubes intended for general corrosion-resistant and high-strength applications. Duplex stainless steel offers a balanced austenitic-ferritic microstructure (approximately 50% austenite / 50% ferrite), delivering approximately twice the yield strength of common austenitic grades like 304 or 316, combined with excellent resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion.

These tubes are widely used in heat exchangers, condensers, instrumentation lines, hydraulic systems, process piping, and oil & gas exploration, where both strength and corrosion resistance are critical.

Key Features
Feature Description
Standard ASTM A789 / ASME SA789
Construction Types Seamless and longitudinally welded
Microstructure Austenitic + Ferritic (≈50/50 dual-phase)
Yield Strength 400 – 550 MPa (depending on grade)
PREN 25 – 42 (depending on grade)
Corrosion Resistance Excellent against SCC, pitting, and crevice corrosion
Temperature Range -50°F to 600°F (-46°C to 316°C)
Magnetic Yes
Weldability Good with proper procedures
Available Grades
Grade UNS Type Yield Strength (min) PREN Key Application
2304 S32304 Lean Duplex ≥400 MPa ~25 Cost-effective alternative to 304/316
2205 S32205 / S31803 Standard Duplex ≥450 MPa ≥35 Most widely used: heat exchangers, process lines
2507 S32750 Super Duplex ≥550 MPa ≥42 Extreme environments; subsea, high chloride
S32760 S32760 Super Duplex (Z100) ≥550 MPa ≥40 Offshore, seawater, sour service
Equivalent Designations
Grade ASTM UNS EN JIS
2304 S32304 1.4362 SUS329J3L
2205 S32205 / S31803 1.4462 SUS329J3L
2507 S32750 1.4410 SUS329J4L
S32760 S32760 1.4501 —
Seamless vs. Welded Tube Comparison
Feature Seamless Tube Welded Tube
Construction No weld seam Longitudinal weld
Pressure Rating Higher Slightly lower
Cost Higher Lower (10-20% less)
Lead Time Longer Shorter
Size Availability Limited in large diameters More flexible
Weld Integrity N/A 100% NDT tested
Best For High pressure, sour service, critical applications General service, heat exchangers, cost-sensitive projects
Corrosion Resistance Highlights
Corrosion Type 2205 Performance 2507 Performance
Pitting / Crevice Excellent (PREN ≥35) Very High (PREN ≥42)
Stress Corrosion Cracking Highly resistant Very highly resistant
General Corrosion Superior to 316L Superior to 2205
Seawater Resistance Good Excellent
H₂S Sour Service NACE MR0175 compliant NACE MR0175 compliant
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