A105 Low Carbon Steel Blind Flange, Forged And Normalized, ASME B16.5 / EN1092-1, Used In Oil And Gas Pipeline

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

Typical chemical composition of ASTM A105 carbon steel (in weight %)

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

Applications of A105 Low Carbon Steel Blind Flange