ASTM A105 Flange Specification

ASTM A105 Flange Specification

ASTM A105/A105M ASME B16.5 Flanges Manuafacturer

The ASTM A105 flange specification is a complete technical reference for carbon steel forged flanges used in ambient and high-temperature pressure service. ASTM A105 flanges are widely applied in oil & gas, petrochemical, power generation, refineries, and industrial piping systems where reliable strength, weldability, and quality control are required.

This page provides a PDF datasheet including flange types, size range, chemical composition, mechanical properties, hardness, heat treatment, testing requirements, and applications.

👉 Download: ASTM A105 Flange Specification PDF

What Is ASTM A105?

ASTM A105 / A105M is a standard specification for forged carbon steel components for pressure systems, including:

  • Flanges

  • Valves

  • Fittings

  • Similar pressure-containing parts

The standard defines chemical composition, mechanical properties, hardness limits, heat treatment, and testing to ensure safe performance under pressure.

Note: For low-temperature service, ASTM A350 LF grades are typically used instead of ASTM A105.

ASTM A105 Flange Types

The ASTM A105 flange specification  covers common flange designs including:

  • Weld Neck Flange (WN)

  • Slip On Flange (SO)

  • Blind Flange (BL)

  • Socket Weld Flange (SW)

  • Threaded Flange (TH)

  • Lap Joint Flange (LJ)

Size Range & Pressure Class

  • Nominal Pipe Size (NPS): 1/2″ – 60″

  • Pressure Class: Class 150 / 300 / 600 / 900 / 1500 / 2500

  • Facing: RF / RTJ / FF (as specified)

Standards & Dimensions

  • Material Standard: ASTM A105 / A105M

  • Flange Dimensions: ASME B16.5 and ASME B16.47 Series A & B

  • General Requirements: ASTM A961

  • Certification: EN 10204 3.1 / 3.2 (optional)

Technical Requirements of ASTM A105 specification

Chemical Composition (ASTM A105)

The PDF includes ASTM A105 chemical limits for key elements such as C, Mn, Si, P, S and alloy residuals.

STEEL DESIGNATION CHEMICAL COMPOSITION
SYMBOLIC C
max		 Si Mn P
max		 S
max		 Cu
max		 Ni
max		 Cr
max		 Mo
max		 V
max		 Nb
max		 Cu + Ni + Cr + Mo
max		 Cr + Mo
max
ASTM A105 0,35 0,10- 0,35 0,60- 1,05 0,035 0,040 0,40 0,40 0,30 0,12 0,08 0,02 1,00 0,32

Mechanical Properties (Room Temperature)

Includes tensile strength, yield strength, and elongation requirements for ASTM A105 forged material.

STEEL QUALITY TENSILE TESTING
UNIFIED TENSILE STRENGTH
R		 DEVIATION FROM PROPORTIONALITY
Rp 0,2 min		 ELONGATION
A min		 C
min		 HB
max
N/mm2 N/mm2 % %
ASTM A105 485 250 22 30 187

Hardness Requirement

  • Maximum Hardness: ≤ 187 HB
    Hardness control helps ensure good weldability and resistance to cracking.

Heat Treatment

ASTM A105 flanges may be supplied as:

  • As-forged

  • Normalized

  • Normalized & tempered (if required)

Testing & Inspection Requirements

The ASTM A105 flange specification PDF includes standard quality control requirements such as:

  • Chemical analysis

  • Tensile test

  • Hardness test

  • Dimensional inspection

  • Visual inspection

  • Optional NDT (UT / MT) upon request

  • MTC documentation with EN 10204 3.1 / 3.2 (optional)

Typical Applications

ASTM A105 forged carbon steel flanges are widely used in:

  • Oil & gas pipelines

  • Petrochemical and chemical plants

  • Power generation facilities

  • Refineries

  • Pressure vessels and industrial piping systems

Download ASTM A105 Flange Specification PDF

This ASTM A105 flange specification PDF is designed for engineering and procurement use, including RFQ, tenders, EPC documentation, and project approval.

📄 Download the ASTM A105 Flange Specification PDF

📄 Download the ASTM A105 standard Specification PDF

📄 Download the ASME SA105 Specification PDF

The ASTM A105 flange specification PDF provides a complete overview of flange types, size range, standards, hardness, testing requirements, and applications for carbon steel forged flanges.
For pricing, drawings, and fast delivery, download the ASTM A105 PDF and contact a reliable carbon steel flange supplier today.

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