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Core Chemical Composition (wt%) - Compliant with American Standard ASTM A789 S32205 & S31803 Standard
The duplex structure (Ferrite + Austenite) is determined by precise chemical composition control, which endows the pipe with both corrosion resistance and high strength. The specific composition is as follows:
Stabilizes austenite, improves strength and corrosion resistance
Iron
Fe
Remainder
Matrix element, forms ferrite-austenite duplex structure
Mechanical Performance Testing
Testing Item
Unit
ASTM A789 Requirement
Our Test Result
Testing Method
Tensile Strength
MPa
≥ 620
630 - 680
ASTM E8/E8M
Yield Strength (0.2% Offset)
MPa
≥ 450
460 - 510
ASTM E8/E8M
Elongation (in 50mm)
%
≥ 25
26 - 30
ASTM E8/E8M
Hardness (Brinell)
HB
≤ 290
260 - 280
ASTM E10
Impact Toughness (at 20°C)
J
≥ 100
110 - 130
ASTM E23
Corrosion Resistance Testing
Testing Item
Testing Standard
Testing Condition
Test Result
Pitting Corrosion Test
ASTM G48
6% FeCl3 Solution, 50°C, 24h
No pitting, corrosion rate ≤ 0.01mm/a
Intergranular Corrosion Test
ASTM A262 Practice A
Boiling 65% HNO3 Solution, 48h
No intergranular corrosion, qualified
Crevice Corrosion Test
ASTM G150
Seawater Simulation Solution, 60°C, 72h
No crevice corrosion
Superior Advantages
Excellent Strength & Toughness Balance: Duplex structure (ferrite + austenite) combines the high strength of ferrite and the good toughness of austenite, tensile strength (630-680MPa) is 1.3-1.5 times that of austenitic stainless steel (such as TP316L), reducing pipe wall thickness and overall project cost.
Outstanding Corrosion Resistance: High Cr, Mo, N content endows excellent resistance to pitting, crevice corrosion, intergranular corrosion and general corrosion, superior to 304/304L and comparable to TP316L; especially suitable for chloride-rich environments (seawater, chemical media with high chloride content).
Good Weldability & Formability: Compliant with ASTM A789 standard, reasonable chemical composition control ensures good weldability; can be welded by TIG/MIG/MMA processes, no easy formation of harmful phases after welding; excellent cold/hot formability, suitable for bending, flanging, expanding and other secondary processing.
Low Cost-Effectiveness: Compared with austenitic stainless steel (TP316L), it has higher strength, can reduce the use of materials (thinner wall thickness) under the same pressure requirements, and the comprehensive cost is 10%-20% lower; long service life, reducing maintenance and replacement costs.
Good High-Temperature & Low-Temperature Performance: Maintains stable mechanical properties and corrosion resistance at continuous high temperatures up to 300°C; good low-temperature toughness, no brittle fracture at -40°C, adaptable to extreme temperature working environments.
Strict Quality Control & Traceability: 100% seamless production, all products undergo strict performance testing (mechanical, corrosion, microstructure, etc.); each batch is accompanied by Mill Test Certificate (MTC), EN 10204 3.1/3.2 certificate available, full traceability of product quality.
Compliant with American Standard & International Standards: Fully compliant with American Standard ASTM A789, compatible with ISO, CE, PED, RoHS certifications, can be exported to Europe, America, Southeast Asia, the Middle East and other regions, no quality barriers in the global market, especially suitable for American standard-oriented projects.
Non-Magnetic & Sanitary Optional: Weak magnetic property, suitable for application scenarios requiring non-magnetic (electronic equipment, precision instruments); optional food-grade polished surface (2B/No.4), non-toxic, no heavy metal leaching, meets GMP/3A sanitary standards.
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
