CARBON STEEL FORGED FLANGE , ASTM A105 FLANGE
A Carbon Steel Forged Flange is a specialized connector produced through the forging process, which involves heating carbon steel and shaping it using compressive forces. Unlike casting, forging refines the grain structure of the metal, resulting in superior mechanical properties, higher impact strength, and better fatigue resistance. These flanges are designed to join pipes, valves, pumps, and other equipment to form a pipeline system.
Key Features & Benefits
1.Superior Material Integrity: The forging process eliminates internal voids and gas pockets, ensuring a dense, uniform structure capable of withstanding extreme stresses.
2.High Pressure & Temperature Tolerance: Typically manufactured from grades like ASTM A105, these flanges are built to handle the rigors of high-temperature service.
3.Precision Machining: Each flange features a finely machined sealing surface (Raised Face, Flat Face, or Ring Joint) to ensure a leak-proof connection.
4.Protective Coatings: To combat carbon steel’s natural enemy—corrosion—these flanges are often finished with black oil, yellow paint, or hot-dip galvanization.
Technical Specification
Forged Flange Types
Chemical composition of ASTM A105N Flange
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Copper (Cu) | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition (%) | 0.35 max | 0.60 - 1.05 | 0.035 max | 0.040 max | 0.10 - 0.35 | 0.40 max | 0.40 max | 0.30 max | 0.12 max | 0.08 max |
Mechanical properties of A105N Flange
| Item | Requirement | MTC Check (Buyer Acceptance) |
|---|---|---|
| Tensile strength | ≥ 485 MPa (70,000 psi) | UTS recorded and meets minimum |
| Yield strength | ≥ 250 MPa (36,000 psi) | YS recorded and meets minimum |
| Elongation | Per ASTM A105/A105N requirements (specimen basis) | Specimen type/thickness basis stated on report |
| Hardness | Per ASTM A105/A105N limit (when required) |
Hardness value recorded and within limit |
Frequently Asked Questions (FAQ)
1. What is the difference between Forged and Cast flanges?
Forged flanges are made by hammering or pressing heated steel, which creates a continuous grain flow. Cast flanges are made by pouring molten metal into a mold. Forged flanges are significantly stronger and less prone to cracking under high pressure.
2. Does a Carbon Steel Forged Flange rust?
Yes, carbon steel is susceptible to oxidation. However, this is easily managed with industrial coatings like anti-rust oil, epoxy painting, or zinc plating (galvanizing).
3. What is the most common grade for these flanges?
ASTM A105 is the most widely used carbon steel grade for forged piping components in ambient and higher-temperature service.
Kasugai Group supply pipe fittings,steel pipes and flanges products for 100 years,If you want to know more about our piping products,please email us:zhangying@kasugai-group.co.jp
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.