Blind Flange ASTM B171 C70600 ASME B16.5 Manufacturer – CuNi 90/10 Flange Supplier
We are a leading manufacturer and exporter of ASTM B171 C70600 Blind Flanges, engineered for marine, offshore, and corrosion-resistant applications. Our ASME B16.5-compliant blind flanges made from Copper-Nickel 90/10 alloy (UNS C70600) are available in Class 150 to Class 600 pressure ratings.
What Is ASTM B171 C70600 Blind Flange?
A Blind Flange is a solid flange with no bore, used to seal the end of a piping system or a pressure vessel nozzle.
ASTM B171 C70600 refers to Copper-Nickel 90/10 (CuNi), an alloy composed of approximately 90% copper and 10% nickel, with excellent resistance to seawater corrosion, biofouling, and erosion. It is commonly used in marine and saltwater piping systems.
ASTM B171 This specification establishes the requirements for copper-alloy plate, sheet, and circles cut from plate and sheet for pressure vessels, condensers, and heat exchangers.
Download ASTM B171-24 standard Latest edition
ASME B16.5 defines the dimensions, tolerances, and pressure ratings for flanges from ½” to 24”.
C70600 Blind Flange Specifications
- Product: Blind Flange
- Material: ASTM B171 UNS C70600 (CuNi 90/10)
- Standard: ASME B16.5
- Pressure Class: Class 150, 300, 600
- Size Range: ½” – 24” (DN15 – DN600)
- Facing Options: RF (Raised Face), FF (Flat Face),
- Manufacturing Method: Forged or plate-cut with full machining
Chemical Composition of C70600 (CuNi 90/10)
| Element | Cu | Ni | Fe | Mn | Zn | Pb | Others |
|---|---|---|---|---|---|---|---|
| % | Rem | 9.0–11.0 | 1.0–1.8 | 1.0 max | 1.0 max | 0.05 max | ≤0.5 |
C70600 Blind Flange Dimension
- Unit : mm
| Pipe | Dimension | Bolt | Remark | ||||
|---|---|---|---|---|---|---|---|
| N/D | O/D | D | C | d | H | N | |
| 1/2″ | 21.3 | 90.0 | 11.2 | 60.3 | 15.9 | 4 | |
| 3/4″ | 26.7 | 100.0 | 12.7 | 69.9 | 15.9 | 4 | |
| 1″ | 33.4 | 110.0 | 14.0 | 79.4 | 15.9 | 4 | |
| 1 1/2″ | 48.3 | 125.0 | 17.5 | 98.4 | 15.9 | 4 | |
| 2″ | 60.3 | 150.0 | 19.0 | 120.7 | 19.1 | 4 | |
| 3″ | 88.9 | 190.0 | 23.9 | 152.4 | 19.1 | 4 | |
| 4″ | 114.3 | 230.0 | 23.9 | 190.5 | 19.1 | 8 | |
| 6″ | 168.3 | 280.0 | 25.4 | 241.3 | 22.3 | 8 | |
| 8″ | 219.1 | 345.0 | 28.6 | 298.5 | 22.3 | 8 | |
| 10″ | 273.0 | 405.0 | 30.2 | 362.0 | 25.4 | 12 | |
| 12″ | 323.8 | 485.0 | 31.8 | 431.8 | 25.4 | 12 | |
| 14″ | 355.6 | 535.0 | 35.0 | 476.3 | 28.6 | 12 | |
| 16″ | 406.4 | 595.0 | 36.0 | 539.8 | 28.6 | 16 | |
| 18″ | 457.2 | 635.0 | 39.7 | 577.9 | 31.8 | 16 | |
| 20″ | 508.0 | 700.0 | 42.9 | 635.0 | 31.8 | 20 | |
| 24″ | 610.0 | 815.0 | 47.7 | 749.3 | 35.0 | 20 | |
- Unit : mm
| Pipe | Dimension | Bolt | Remark | ||||
|---|---|---|---|---|---|---|---|
| N/D | O/D | D | C | d | H | N | |
| 1/2″ | 21.3 | 95.0 | 14.3 | 66.7 | 15.9 | 4 | |
| 3/4″ | 26.7 | 115.0 | 15.9 | 82.6 | 19.1 | 4 | |
| 1″ | 33.4 | 125.0 | 17.5 | 88.9 | 19.1 | 4 | |
| 1 1/2″ | 48.3 | 155.0 | 20.7 | 114.3 | 22.3 | 4 | |
| 2″ | 60.3 | 165.0 | 22.3 | 127.0 | 19.1 | 8 | |
| 3″ | 88.9 | 210.0 | 28.6 | 168.3 | 22.3 | 8 | |
| 4″ | 114.3 | 255.0 | 31.8 | 200.0 | 22.3 | 8 | |
| 6″ | 168.3 | 320.0 | 36.6 | 269.9 | 22.3 | 12 | |
| 8″ | 219.1 | 380.0 | 41.3 | 330.2 | 25.4 | 12 | |
| 10″ | 273.0 | 445.0 | 47.7 | 387.4 | 28.6 | 16 | |
| 12″ | 323.8 | 520.0 | 50.8 | 450.8 | 31.8 | 16 | |
| 14″ | 355.6 | 585.0 | 54.0 | 514.4 | 31.8 | 20 | |
| 16″ | 406.4 | 650.0 | 57.2 | 571.5 | 35.0 | 20 | |
| 18″ | 457.2 | 710.0 | 60.4 | 628.6 | 35.0 | 24 | |
| 20″ | 508.0 | 775.0 | 63.5 | 685.8 | 35.0 | 24 | |
| 24″ | 610.0 | 915.0 | 69.9 | 812.8 | 41.3 | 24 | |
*NOTE :1. Dimension Per ASME B16.5
2. Process : Rolled Plate
Available Standards
- ASME B16.5 – Pipe Flanges and Flanged Fittings
- ASME B16.47 – Large Diameter Flanges
- EN 1092-1 – European Flange Standard
- DIN 86029 / 86030 – Copper Nickel Flanges
Related Products
- ASTM B171 C70600 Slip On Flange
- ASTM B171 C70600 Weld Neck Flange
- ASTM B171 C70600 Socket Weld Flange
- Copper Nickel 90/10 Pipes
- Cuni Pipe fittings
Order Example
Product: ASTM B171 C70600 Blind Flange
Type: ASME B16.5, Class 150, Raised Face
Size: 6” (DN150)
Quantity: 20 pcs
Material Certification: EN 10204 3.1
