ASTM A105 Specification for Flange,forged fittings.
ASTM A105 is a standard material specification for forged carbon steel piping components including bolts, nuts, studs and other fasteners to standard or custom dimensions, for use in ambient and higher temperature service in pressure systems.
A105 Specifications
Scope
ASTM A105 and ASME SA105 covers seamless forged carbon steel piping components for use in pressure systems at ambient and high-temperature service.
Flanges, fittings, valves and various other parts ordered to customer dimension or to industry standards such as MSS, ASME and API specification are included in the scope.
Forgings to this specification are limited to 10,000 lbs.
Welding
These components can be welded. Welding procedures must comply with ASME Boiler and Pressure Vessel Code Section IX.
Heat Treatment
Heat treatment is not a mandatory requirement except for flanges above Class 300, flanges of special design where the design pressure or design temperature are not known and for items over 4” NPS and above Class 300. When heat treatment is required, annealing, normalizing, normalize and temper, normalize and quench and tempering shall be the applied methods.
Forging
This alloy is forged at between 1,700 degrees Fahrenheit and 2,200 degrees Fahrenheit, followed by quenching and tempering.
Chemical Composition
| Element | Composition, % |
|---|---|
| Carbon | 0.35 max |
| Manganese | 0.60 – 1.05 |
| Phosphorus | 0.035 max |
| Sulfur | 0.040 max |
| Silicon | 0.10 – 0.35 |
| Copper | 0.40 max [Note B] |
| Nickel | 0.40 max [Note B] |
| Chromium | 0.30 max [Note B, C] |
| Molybdenum | 0.12 max [Note B, C] |
| Vanadium | 0.08 max |
Notes
A : For each reduction of 0.01 % below the specified carbon maximum (0.35 %), an increase of 0.06 % manganese above the specified maximum (1.05 %) will be permitted up to a maximum of 1.65 %. B : The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00 %.
C : The sum of chromium and molybdenum shall not exceed 0.32 %.
Mechanical Properties
| Property | Value | |
|---|---|---|
| Tensile Strength, min, ksi | 70.00 | |
| Yield Strength, min, ksi [Note A] | 36.00 | |
| Elongation in 2 inch. | Round Specimen | 22.00 |
| Strip Specimen 5/16″ and Over | 30.00 | |
| Strip Specimen, Smaller sizes | See next table | |
| Reduction of Area, min, % [Note B] | 30.00 | |
| Hardness, HWB, max | 187 | |
Hydro-static Test
Hydro-static Test shall be conducted by the forging manufacture only when Supplemental S57 of ASTM A961 is specified.