Yuhong Group Co.,Ltd
| Payment Terms | L/C,T/T |
| Supply Ability | According to customer's request |
| Delivery Time | Depend on the quantity |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | ASTM A789 UNS S31803 Duplex Steel Tube |
| Specification | ASTM A789 |
| Grade | UNS S31803 |
| O.D. | 1/2”to 8" |
| W.T. | AW/MW |
| Type | Seamless Or Welded |
| End | Plain End, Beveled End |
| Application | Heat Exchanger, Oil And Gas, Boiler, Reactor |
| Brand Name | YUHONG |
| Model Number | ASTM A789 UNS S31803 1.4462 |
| Certification | ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C,T/T | Supply Ability | According to customer's request |
| Delivery Time | Depend on the quantity | Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | ASTM A789 UNS S31803 Duplex Steel Tube | Specification | ASTM A789 |
| Grade | UNS S31803 | O.D. | 1/2”to 8" |
| W.T. | AW/MW | Type | Seamless Or Welded |
| End | Plain End, Beveled End | Application | Heat Exchanger, Oil And Gas, Boiler, Reactor |
| Brand Name | YUHONG | Model Number | ASTM A789 UNS S31803 1.4462 |
| Certification | ABS, LR, GL, DNV, NK, TS, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 | Place of Origin | China |
| High Light | ASTM A789 duplex stainless steel tube ，UNS S31803 seamless steel tube ，welded duplex stainless steel tube | ||
ASTM A789 UNS S31803 1.4462 Seamless and Welded Duplex Stainless Steel Tube
ASTM A789 UNS S31803 (1.4462) Seamless and Welded Duplex Stainless Steel Tube is a high-performance corrosion-resistant steel tube designed for demanding industrial applications. It is manufactured from duplex stainless steel (austenitic-ferritic structure), offering excellent strength, pitting resistance, and stress corrosion cracking resistance. This product is available in both seamless and welded forms, with a controlled averange/ minimum wall thickness to ensure structural integrity under high-pressure and harsh environments. It is widely used in oil & gas, chemical processing, desalination, and marine engineering.
1.Chemical & Mechanical Properties
| ASTM A789 UNS S31803 Chemical Composition (%) | ||||||||
| C | Mn | P | S | Si | Cr | Ni | Mo | N |
| ≤ 0.030% | ≤ 2.00% | ≤ 0.030% | ≤ 0.020% | ≤ 1.00% | 21.0 - 23.0% | 4.5 - 6.5% | 2.5 - 3.5% | 0.08 - 0.20% |
Mechanical Properties
| Property | Standard Value |
|---|---|
| Tensile Strength | 620 - 795 MPa |
| Yield Strength (0.2% offset) | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness (Brinell) | ≤ 32 HRC |
| (-46°C) Charpy V-notch (-46°C) | ≥40 J |
Key Mechanical Characteristics
2. Key Adventages
High strength properties: Yield strength (≥450MPa) is twice that of 304 stainless steel, with tensile strength (620-795MPa) significantly exceeding conventional austenitic grades.
Weight reduction: Allows 20-30% material savings compared to standard stainless steels at equivalent pressure ratings.
Dual protection: Synergistic effect of Cr(21-23%)+Mo(2.5-3.5%)+N(0.08-0.20%)
Specialized resistance: Chloride stress corrosion cracking, pitting/crevice corrosion (PREN≥35), acid media
Lower lifecycle cost: 40-60% savings vs nickel alloys, 2-3x service life vs 316L
Easy installation: Excellent weldability (no PWHT required), CTE similar to carbon steel (13.5×10⁻⁶/℃)
Wide temperature range: Stable performance from -50℃ to 300℃
Dual-phase benefits: Ferrite phase for strength + Austenite phase for toughness
3. Key Applications
Selection Guidance
Order information:
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Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
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...
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