NACE MR0175 RTJ Weld Neck A105 flanges are specialized components designed for "sour service" in oil and gas production. While A105 is a standard carbon steel, NACE compliance requires strict control over hardness (typically max 22 HRC) and chemical composition to prevent Sulfide Stress Cracking (SSC). The Ring Type Joint (RTJ) face provides a high-integrity metal-to-metal seal, making these flanges ideal for high-pressure pipelines carrying corrosive hydrogen sulfide (H2S) in upstream environments.
Technical attributes
Standard: ASME B16.5
Compliance: NACE MR0175 / ISO 15156
Material Grade: ASTM A105 (NACE)
Flange Type: Weld Neck (WN)
Facing Type: Ring Type Joint (RTJ)
Pressure Class: 600# to 2500#
Hardness Limit: Max 22 HRC (237 HBW)
Manufacturing: Forged and Machined
Heat Treatment: Normalized (Required)
Carbon Equivalent: Max 0.43% typically
Groove Finish: 63 RMS (1.6 Ra) Max
Size Range: NPS 1/2 to NPS 24
Yield Strength: Min 250 MPa
Tensile Strength: Min 485 MPa
Sealing Interface: Metal-to-Metal Ring
Service Environment: Sour Service (H2S)
Certification: EN 10204 3.1
Bolt Hole Pattern: Standard ASME B16.5
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
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