Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASTM A105 Carbon Steel Flanges—Core Pressure-Bearing Solution for High-Pressure Pipeline Systems
Introduction:
Crafted through rigorous forging processes, A105 flanges are engineered for high-pressure, high-temperature applications in petroleum, chemical, and power industries. With 485 MPa tensile strength, -29°C to 425°C temperature resilience, and NACE compliance, they redefine reliability standards for pipeline connections.
Visualizing Technical Advantages
1. Material Performance
High Strength & Toughness:
Normalizing treatment (A105N) refines grain structure, delivering tensile strength ≥485 MPa, hardness ≤187 HB, and elongation ≥22%—far exceeding the fatigue life of cast steel flanges.
Corrosion Resistance Guarantee:
Passes HIC (Hydrogen-Induced Cracking) and SSC (Sulfide Stress Corrosion) tests, compliant with ISO 15156/NACE MR0175, ensuring reliability in sulfur-rich oil/gas environments.
2. Precision Manufacturing
Closed-Die Forging Technology:
Utilizes precision molds to align grain flow with flange contours, eliminating porosity and segregation while boosting pressure capacity by 30%.
Full CNC Machining:
Sealing surface roughness ≤Ra 3.2 μm, bolt hole positioning accuracy ±0.05 mm, guaranteeing zero-leak sealing.
3. Lightweight Design
Weighs only 70% of equivalent cast steel flanges, reducing installation effort and logistics costs—ideal for aerial or confined workspaces.
Quality Assurance: Certifications & Inspections
Dual International Certifications:
Compliant with ASME B16.5 (US), EN1092-1 (EU), and HG/T20615 (CN), covering PN6–PN100/Class 150–2500 pressure ratings.
End-to-End Quality Control:
Spectrometry (composition) → Ultrasonic testing (defects) → Hardness test (HB 140–180)
Documentation:
Includes EN 10204 3.1 material certificates and third-party test reports if required.
Carbon Steel Flange Tpyes
| A105 Carbon Steel Flange Types | Size | |
| Carbon Steel Slip-On Flanges | Carbon Steel Weld Neck Flanges | 1/2″ – 48″ |
| Carbon Steel Threaded Flanges | Carbon Steel Socket Weld Flanges | |
| Carbon Steel Plate Flanges | Carbon Steel Reducing Flanges | |
| Carbon Steel Lap Joint Flanges | Carbon Steel Blind Flanges | |
| Carbon Steel Square Flanges | Carbon Steel Ring Type Joint Flanges | |
| Carbon Steel Forged Flanges | Carbon Steel Orifice Flanges | |
Typical chemical composition of ASTM A105 carbon steel (in weight %)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35 max |
| Manganese (Mn) | 0.60–1.05 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.040 max |
| Silicon (Si) | 0.10–0.35 |
| Copper (Cu) | 0.40 max (if specified) |
| Nickel (Ni) | 0.40 max (if specified) |
| Chromium (Cr) | 0.30 max (if specified) |
| Molybdenum (Mo) | 0.12 max (if specified) |
| Vanadium (V) | 0.08 max (if specified) |
Note: The elements like Cu, Ni, Cr, Mo, and V are considered residual elements unless specified by supplementary requirements (e.g., S5, S6).
ASTM A105 —— Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 485 MPa (70 ksi) min |
| Yield Strength (0.2% offset) | 250 MPa (36 ksi) min |
| Elongation in 50 mm (2 in.) | 22% min |
| Reduction of Area | 30% min |
| Hardness (Brinell) | 187 HB max (or ~91 HRB max) |
Applications of A105 Low Carbon Steel Blind Flange
| Industry | Typical Scenarios | Customer Benefits |
|---|---|---|
| Oil & Gas | Wellheads, oil pipelines | Resists sulfur corrosion, prevents hydrogen embrittlement, extends maintenance cycles 3x |
| Chemical/Pharma | Reactor piping, acid/alkali transport | Withstands pH 2–12 erosion, ensures medium purity |
| Power/Shipbuilding | Boiler feedwater, ship ballast pipes | -29°C low-temperature toughness, resists water hammer vibration |
