ASTM A105 Carbon Steel Forged Blind Flange

ASTM A105 blind flange is manufactured from high-strength carbon steel forgings, processed by strict forging and heat treatment, and finished with precision machining.

ASTM A105 Blind Flange Manufaturer

SSM fabrique ASTM A105 blind flanges using high-quality forged carbon steel. These flanges are designed to provide reliable sealing and closure for pipelines and equipment in demanding applications. They are widely used in oil & gas, petrochemical, chemical processing, marine, and power generation industries.

Specifications of ASTM A105 Blind Flanges:

  • Gamme de tailles : 1/2″ to 48″ (DN15 to DN1200)
  • Pressions nominales : Class 150 to Class 2500
  • Facing Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
  • Normes : ASME B16.5, ASME B16.47 Series A/B, MSS SP-44
  • Matériel: ASTM A105 Carbon Steel Forging
  • Types : Blind Flanges with RF/FF/RTJ Facing, Custom Machined Options
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Carbon Steel Forgings (A105 / A105N) SSM Can Supply

SSM can also supply ASTM A105 blind flanges according to ASME / ANSI / MSS (American standards), European / International standards, and Oil & Gas industry standards as detailed below:

1. ASME / ANSI / MSS (American Standards)

  • ASME B16.5 – Steel pipe flanges, small diameter (1/2″–24″).
  • ASME B16.47 Series A/B – Steel pipe flanges, large diameter (26″–60″).
  • MSS SP-44 – Large-diameter steel flanges (later incorporated into B16.47 Series A).
  • API 6A – Flanges for oil and gas wellhead equipment.
  • ANSI B16.25 – Butt-welding end preparation (applicable to blind flange welding ends).
  • ANSI B16.36 – Flanges with tapped holes (instrument connections).
  • ANSI B16.48 – Line blanks (Spectacle Blind flanges).
  • MSS SP-25 – Standard marking system for flanges and fittings.

2. European / International Standards

  • EN 1092-1 – European standard for steel flanges, PN2.5–PN400.
  • ISO 7005-1 – International Organization for Standardization flange standard, equivalent to EN 1092.
  • DIN 2527 – German standard for blind flanges.
  • BS 4504 – British flange standard (gradually replaced by EN 1092).

3. Oil & Gas Industry Standards

  • NORSOK L-005 – Norwegian petroleum industry standard, commonly used in offshore platforms.
  • DNV-OS-F101 – DNV offshore pipeline standard, including flange selection requirements.
  • API 6D / ISO 14313 – Pipeline valves and fittings standards, covering flange connections.
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Advantages & Disadvantages of A105 Blind Flange

Avantages

  • Removable and reusable, convenient for maintenance.
  • More flexible than welded end caps, suitable for temporary closure.
  • High strength, suitable for high-pressure service.
  • Relatively simple to manufacture, cost-effective.

Inconvénients

  • Heavy (especially for large diameter and high class ratings).
  • Carbon steel A105 has poor toughness at low temperatures (not recommended below –20 °C).
  • Requires gasket + bolts; sealing reliability depends on proper installation.

A105 Blind Flange Application

  • Oil & Gas Pipelines: Temporary isolation, pressure testing.
  • Chemical Pipelines: Safety isolation in corrosive or hazardous media.
  • Power, Shipbuilding, Metallurgy: During maintenance or for standby pipelines.
  • Storage Tanks / Pressure Vessels: Seal unused nozzles or connections.
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Fournisseur unique de brides aveugles A105 pour tous vos besoins

SSM has significant product advantages in manufacturing A105 Blind Flanges. Whether it’s quality or price, we will meet your needs.

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ASTM A105 Blind Flange – Manufacturing & Quality Control Details

Carbon Steel Forgings (A105 / A105N)

  • ASTM A105: Standard specification for carbon steel forgings for piping components, suitable for ambient and high-temperature service.
  • ASTM A105N: Indicates the forging has been normalized (heat treated), which refines the grain structure and improves impact toughness, making it more reliable under fluctuating loads and higher pressure conditions.
  • The material is carefully selected from certified steel mills to ensure consistent chemistry, mechanical properties, and traceability.

ASTM A105 Blind Flange Manufacturing Process

  • Forging: Raw billets are heated and hot forged into rough flange blanks, ensuring directional grain flow for enhanced strength and resistance to stress.
  • Traitement thermique:
  • Normalizing (N): Heated to above the transformation temperature and air-cooled to refine grain size.
  • Normalizing + Tempering: Further improves toughness, ductility, and dimensional stability.
  • Usinage: CNC lathes and precision milling machines are used to achieve final dimensions, facing types (RF/FF/RTJ), and surface finish per ASME standards.
  • Traitement de surface: Flanges may be shot-blasted, anti-rust oiled, or coated (black oxide, galvanization, epoxy painting) depending on customer requirements.

ASTM A105 Blind Flange Inspection & Testing Items

  • Chemical Analysis: Ensures conformity to ASTM A105 composition (C, Mn, Si, S, P, etc.) using spectrometers or wet chemistry.
  • Mechanical Testing:
  • Tensile Test (yield strength, tensile strength, elongation).
  • Impact Test (Charpy V-notch at specified temperature, when required).
  • Hardness Test (Brinell, Rockwell, or Vickers depending on spec).
  • Dimensional & Tolerance Checks: Measured with calibrated gauges per ASME B16.5 / B16.47.
  • Surface Quality: Visual inspection for cracks, laps, pits, and machining finish; magnetic particle or dye penetrant testing may be performed on critical areas.
  • Pressure Testing: Hydrostatic or pneumatic test to confirm sealing reliability, especially for high-pressure classes (900–2500).
  • Nondestructive Testing (optional/customer request): Ultrasonic testing (UT) for internal flaws, Radiographic testing (RT) for weld repairs.

FAQ

Both seal the pipeline, but blind flanges are detachable and reusable, while welded end caps are permanent.

A105N means normalized A105 (heat-treated), giving finer grain structure and better toughness.

Not ideal for continuous low-temperature (< –20 °C). Materials like A350 LF2 are recommended instead.

It depends on the pressure class (Class 150 ~ 2500). For example, Class 2500 can exceed 400 bar.

  • By pipe size (NPS)

  • By pressure class (150–2500)

  • By service temperature (use A105 for ambient/high-temperature; switch to low-temperature steels when needed)

  • By facing type (RF, RTJ, FF)

With over 30 years of experience, SINO SPECIAL METAL (SSM) is a trusted manufacturer and supplier of ASTM A105 blind flanges:

  • Production Capability: Specializes in carbon steel forged blind flanges (ASTM A105 / A105N), fully compliant with ASME / MSS standards.
  • Prix compétitifs : Direct factory supply with cost-effective solutions for large-volume orders.
  • Quality Assurance: 100% PMI material testing, strict dimensional accuracy, and EN 10204 3.1/3.2 MTC certification available.
  • Fast Delivery: Standard sizes in stock; customized blind flanges delivered within 15–30 days.
  • Comprehensive Service: Third-party inspection, export-standard packaging, and worldwide delivery.

Choose SSM for reliable, high-quality ASTM A105 blind flanges – we look forward to being your trusted partner!

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RTJ flange is a high-integrity sealing flange using a metal ring gasket, ideal for high-pressure and high-temperature oil & gas

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