ASTM A105 is the standard specification covering forged carbon steel piping components for ambient- and higher-temperature service in pressure systems. It can be readily manufactured to flanges, fittings, valves, and other piping components in accordance with dimensional standards such as MSS, ASME, API, EN/BS, DIN, NOSOK specifications, etc. A105 forgings are limited to a maximum weight of 4540 kg [10000 lb]. As stated in our quality manual, welding repair of defects in ASTM A105 flanges or fittings is absolutely prohibited by Metals-Piping(although it is permissible by the standard).

 1. Chemical Composition Requirements

Chemical Composition of ASTM A105
Elements	Composition, %
Carbon [C]	≤0.35
Manganese [Mn]	0.60-1.05
Phosphorus [P]	≤0.35
Sulfur [S]	≤0.40
Silicon [Si]	0.10-0.35
Copper [Cu]	≤0.40
Nickel [Ni]	≤0.40
Chromium [Cr]	≤0.30
Molybdenum [Mo]	≤0.12
Vanadium [V]	≤0.08

*The sum of Cu, Ni, Cr, Mo and V shall not exceed 1.00%.
*The sum of Cr and Mo shall not exceed 0.32%.
*The carbon equivalent CE=[C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15] shall be no greater than 0.47.

2. Mechanical Properties of ASTM A105

Tensile Strength min.		Yield Strength min.		Elongation min.	Reduction of Area, min.	Hardness
MPa	ksi	MPa	ksi	%	%	HBW
485	70	250	36	22	30	137-187

3. Heat Treatment of ASTM A105

Heat treatment is not a mandatory requirement of ASTM A105 piping components. However, there are some exceptions: ASME B16.5 flanges Class 400, 900, 1500, 2500; Flanges of special design where the design pressure at the design temperature exceeds the pressure-temperature ratings of Class 300; Flanges of special design where the design pressure or temperature are not known; Forged fittings or valve parts which are over 4″ and Class 300.

The typical heat treatment conducted for A105 forgings includes annealing(A), normalizing(A), normalizing and tempering(NT), quenching and tempering(QT). Especially, normalizing at approximate 950°C for 2.5 hours is often required by many clients to eliminate possible internal stress in the forgings. These materials are usually marked as “ASTM A105N”.

4. Product Forms and Standards

Product Form	Standards
Forged Flanges	ASME B16.5, ASME B16.47, MSS SP 44, EN 1092-1, NORSOK L-005, BS 4504, ASME B16.48, ASME B16.36
Forged Fittings	ASME B16.11, BS 3799, MSS SP 83, MSS SP 95, MSS SP 97, GB/T14383, GB/T14626
Valve & Valve Parts	ASME B16.34, API 600, API 602
Boiler & Pressure Vessel	ASME Section IX

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