Yuhong Group Co.,Ltd
| Payment Terms | L/C,T/T |
| Supply Ability | According to Clients' requirements |
| Delivery Time | Depend on quantity |
| Packaging Details | Ply-wooden Case /Iron Case |
| Product Name | Duplex Steel Forged Weldneck Flange |
| Specification & Material | ASTM A182 F51 |
| Process | Forged |
| Type | Weldneck(WN) |
| Sealing Surface | RF/FF/RTJ |
| Pressure | Class150/300/600/900/1500/2500 |
| Application | Offshore & Marine Engineering / Oil & Gas / Chemical & Petrochemical |
| Testing | UT, PT, MT, PMI |
| Brand Name | YUHONG |
| Model Number | ASTM A182 F51 |
| Certification | API , ABS, DNV, GL , LR, NK |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C,T/T | Supply Ability | According to Clients' requirements |
| Delivery Time | Depend on quantity | Packaging Details | Ply-wooden Case /Iron Case |
| Product Name | Duplex Steel Forged Weldneck Flange | Specification & Material | ASTM A182 F51 |
| Process | Forged | Type | Weldneck(WN) |
| Sealing Surface | RF/FF/RTJ | Pressure | Class150/300/600/900/1500/2500 |
| Application | Offshore & Marine Engineering / Oil & Gas / Chemical & Petrochemical | Testing | UT, PT, MT, PMI |
| Brand Name | YUHONG | Model Number | ASTM A182 F51 |
| Certification | API , ABS, DNV, GL , LR, NK | Place of Origin | China |
| High Light | ASTM A182 F51 S31803 flange ，Forged Weldneck Flange ，B16.5 Weldneck Flange | ||
ASTM A182 F51 S31803 Duplex Steel Forged Weldneck Flange 150#-2500# B16.5
This product is a Weld Neck Flange forged and solution-annealed from Duplex Stainless Steel alloy ASTM A182 Grade F51 (UNS S31803), which contains 22% chromium, 5% nickel, 3% molybdenum, and nitrogen. Its dual-phase microstructure (approximately 50% ferrite and 50% austenite) provides an outstanding combination of properties: approximately double the yield strength of standard austenitic stainless steels (e.g., 316L), along with excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion, as well as good weldability and toughness.
The tapered hub of the weld neck design ensures facilitating superior stress distribution and making it ideal for high-pressure and high-cycle duty under demanding conditions. Due to its high strength, superior corrosion resistance, and cost-effectiveness, this flange is the preferred solution for critical piping connections in industries such as Oil & Gas (particularly offshore and sour service), Chemical & Petrochemical Processing, Seawater Desalination & Cooling Systems, Pulp & Paper Bleaching Plants, and Flue Gas Desulfurization (FGD) Systems, where handling chloride-containing, acidic, or corrosive media is required.
| GRADE |
STANDARD |
WERKSTOFF NR. |
UNS |
|---|---|---|---|
| F51 |
Duplex 31803 |
1.4462 |
S31803 |
Chemical & Mechanical Properties
|
C |
Cr | Mn |
Si |
P | S | Ni | N | Mo | Fe |
| 0-0.03 | 21.00-23.00 | ≤2.00 | ≤1.00 | 0-0.03 | 0-0.02 | 4.50-6.50 | 0.08-0.20 | 2.50-3.50 | Balance |
Mechanical Properties
| Tensile Strength | Yield Strength (0.2% offset) | Elongation in 2 in. or 50 mm | Hardness |
| ≥ 620 MPa | ≥ 450 MPa | ≥ 25% | ≤ 290HB |
Key Adventages
Key Applications
Stainless steel flanges Test Certificates
Material Testing
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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