A/SA105 Forgings Specification
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.
Mechanical Properties
| Tensile | 70 ksi, min |
| Yield, note A | 36 ksi, min |
| Elongation in 2in, Basic minimum for wall 5/16″ and over, strip test | 30% |
| Hardness | 187 HBW max |
| Note A – Determined by either the 0.2% offset method or the 0.5% extension-under-load method. Other test methods available as listed in A105. | |
Chemical Composition
| Element | Composition %, Note C |
|---|---|
| Carbon | .35 max |
| Manganese | .60-1.05 |
| Phosphorus | .035 max |
| Sulfur | .040 max |
| Silicon | .10-35 |
| Copper | .40 max, note A |
| Nickel | .40 max, note A |
| Chromium | .30 max, note A,B |
| Molybdenum | .12 max, note A,B |
| Vanadium | .08 max, note A |
| Note A – The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00% Note B – The sum of chromium and molybdenum shall not exceed .32% Note C – for each reduction of 0.01% below the specified carbon maximum (.35%), an increase of .06% manganese above the specified maximum (1.05%) will be permitted up to a maximum of 1.65% |
|
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.
Reference Documents
- A266/A266M Specification for Carbon Steel Forgings for Pressure Vessel Components
- A675/A675M Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties
- A696 Specification for Steel Bars, Carbon, Hot-Wrought or Cold-Finished, Special Quality, for Pressure Piping Components
- A788/A788M Specification for Steel Forgings, General Requirements
- A961/A961M Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications
- MSS Standard – SP 44 Standard for Steel Pipe Line Flanges
- B16.5 Dimensional Standards for Steel Pipe Flanges and Flanged Fittings
- B16.9 Wrought Steel Buttwelding Fittings
- B16.11 Forged Steel Fittings, Socket Weld, and Threaded
- B16.34 Valves-Flanged, Threaded and Welding End
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* This information is provided for quick references. Always consult applicable ASME, ASTM and Manufacture’s standards.