Standard Scope
ASTM A105 covers forged carbon steel flange and piping components for ambient and higher-temperature service in pressure systems. It also includes pipe fittings, valves, and similar parts.
The maximum weight of a manufactured forging part according to this standard is 10,000 lbs (4540 kg). Larger forgings can be produced in accordance with A266/A266M.
This specification does not cover tube sheets and hollow cylindrical forgings for pressure vessel shells. It also does not cover raw materials such as round bars and seamless tubular products used to produce piping components.
Referenced Documents
ASTM Standards
| Standard | Description |
|---|---|
| A266/A266M | Carbon steel forgings for pressure vessel components |
| A675/A675M | Hot-rolled carbon steel bars (special quality) |
| A696 | Carbon steel bars for pressure piping components |
| A788/A788M | General requirements for steel forgings |
| A961/A961M | General requirements for flanges, fittings, valves |
MSS Standard
- SP44 – Steel pipeline flanges
ASME Standards
- B16.5 – Steel pipe flanges and flanged fittings
- B16.9 – Butt-welding fittings
- B16.10 – Face-to-face valve dimensions
- B16.11 – Forged steel fittings
- B16.34 – Valves (flanged, threaded, welded)
- B16.47 – Large diameter flanges
- ASME Boiler and Pressure Vessel Code
Terminology
For definitions of terms used in this specification, refer to A961/A961M.
Ordering Information
Refer to specification A961/A961M.
General Requirements
In case of conflict between this specification and A961/A961M, this specification shall prevail.
Heat Treatment
Heat treatment is not required except for:
- Flanges above Class 300
- Special design flanges
- Items above 4″ NPS and Class 300
Applicable methods include: annealing, normalizing, normalizing & tempering, and quenching & tempering.
Welding
Components may be welded. Welding procedures must comply with ASME Boiler and Pressure Vessel Code Section IX.
Forging
ASTM A105 carbon steel can be forged at temperatures ranging from 2200°F to 1700°F, followed by quenching & tempering or normalizing.
Annealing
Forged parts are cooled below 1000°F, then reheated to between 1550°F and 1700°F, followed by slow furnace cooling.
Hydrostatic Test
Hydrostatic testing shall be conducted by the forging manufacturer only when Supplemental Requirement S57 of ASTM A961 is specified.