YUHONG HOLDING GROUP CO., LTD
| Payment Terms | L/C,T/T |
| Supply Ability | Accdording to customer's request |
| Delivery Time | Depends on quantity |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | Duplex Stainless 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 | ASME SB163 MONEL 400 (UNS N04400) |
| 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 | Accdording to customer's request |
| Delivery Time | Depends on quantity | Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap |
| Product Name | Duplex Stainless 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 | ASME SB163 MONEL 400 (UNS N04400) |
| 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 heat exchanger 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
| Tensile Strength | Yield Strength (0.2% offset) | Elongation | Hardness (Brinell) | (-46°C) Charpy V-notch (-46°C) |
| 620 - 795 MPa | ≥ 450 MPa | ≥ 25% | ≤ 32 HRC | ≥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
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Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
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