A105 Carbon Steel Flanges
ASTM A105 Carbon Steel Flanges – Technical Specifications & Supplier Guide
1. Overview of ASTM A105 Flanges
ASTM A105 is a forged carbon steel specification for flanges, fittings, and valves used in high-pressure/temperature piping systems. Key characteristics:
Material Type: Medium-carbon steel (0.35% max carbon)
Applications: Oil & gas, petrochemical, power plants, waterworks
Standards Compliance: ASME B16.5, B16.47, API 6A, MSS SP-44
2. Product Specifications
| Parameter | Details |
|---|---|
| Pressure Classes | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Size Range | ½" to 60" (NPS) |
| Flange Types | Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ) |
| Face Types | Raised Face (RF), Flat Face (FF), Ring-Type Joint (RTJ) |
| Temperature Range | -29°C to 425°C (higher temps require derating) |
| Surface Finish | Black, galvanized, or anti-rust coated |
3. Mechanical & Chemical Properties
Chemical Composition (%) (ASTM A105 Requirements):
| C | Mn | P | S | Si | Cu | Ni | Cr | Mo | V |
|---|---|---|---|---|---|---|---|---|---|
| ≤0.35 | 0.6–1.05 | ≤0.035 | ≤0.04 | 0.10–0.35 | ≤0.4 | ≤0.4 | ≤0.3 | ≤0.12 | ≤0.08 |
Mechanical Properties:
Tensile Strength: ≥485 MPa (70 ksi)
Yield Strength: ≥250 MPa (36 ksi)
Hardness: ≤187 HB (annealed condition)
4. Manufacturing Process
Forging: Hot forging for grain structure refinement
Machining: CNC precision drilling/boring
Heat Treatment: Normalizing for stress relief
Testing: Hydrostatic, PMI, UT/RT (optional)
Surface Treatment: Shot blasting, coating
5. Quality Certifications
Material Traceability: MTC 3.1 with heat number
Testing Standards:
NDE: Ultrasonic (ASTM A388), Liquid Penetrant (ASTM E165)
Dimensional: ASME B16.5 tolerances
Certifications: ISO 9001, PED 2014/68/EU, API 6A
6. Advantages of ASTM A105 Flanges
✔ High Strength-to-Weight Ratio – Suitable for heavy-duty applications
✔ Weldability – Compatible with common welding techniques (SMAW, GTAW)
✔ Cost-Effective – Lower lifecycle cost vs. stainless steel
✔ Versatility – Works with carbon steel, stainless, and alloy piping
7. Price Considerations
Price Range: 5–5–500 per unit (varies by size/class)
Bulk Discounts: Available for orders >50 pieces
Lead Time: 15–30 days for standard sizes
8. When to Choose ASTM A105 Flanges?
Recommended For:
Steam, water, oil, and gas services
Non-corrosive environments (for corrosive media, consider A105N or stainless)
Avoid For:
Cryogenic temps (<-29°C) – Use ASTM A350 LF2 instead
Highly corrosive fluids – Switch to SS316 or duplex
9. Trusted ASTM A105 Flange Suppliers
Top Manufacturers:
SSM (China) – High-volume OEM supplier
Procurement Tips:
Request mill test certificates (MTC)
Verify heat treatment reports
Check dimensional compliance with ASME B16.5
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① Flange type/size ② Pressure class ③ Quantity ④ Surface treatment
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