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 manufactured forging part follows by this standard is 10000 bounds (4540kg). The larger forgings can according by the standard A 266/A266M. This specification do not covers tube sheets and hollow cylindrical forgings for pressure vessel shells .
This specification does not covers raw material which round bar and seamless tubular produced piping components.
Specification Format of SA105N Flange
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Material:
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Corbon steel:ASTM A105/105N;A694 F42-F70;A350LF1/LF2;
Stainless steel:ASTM A182 F304/ 304L;F316/316L;F321;F51;
Alloy steel:ASTM A182 F11/F12/F22;
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Pressure:
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150# 300# 600# 900# 1500# 2500#
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Surface preparation:
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Anti-rust black paint, anti-rust varnish, transparent anti-rust oil, hot galvanized, sandblasting.
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FF RF MFM TG RJ
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Packing detail
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Free fumigation wooden cases, trays can be according to customer requirements for special packaging
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Product delivery time
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20days for bulk, 7-10 working days for inventory.
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Minimum Order Quantity
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According to customer's requirement
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Application Range
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It is widely used in petroleum, chemical industry, nuclear power plant, food manufacturing, construction, shipbuilding,
papermaking, medicine and other industries.
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Chemical Composition of ASTM A105 Material
The chemical composition of ASTM A105 carbon steel ensures a balance between strength, weldability, and corrosion resistance. The typical chemical composition is as follows:
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Element
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Composition (%)
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Carbon (C)
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≤ 0.35
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Manganese (Mn)
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0.60 – 1.05
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Phosphorus (P)
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≤ 0.035
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Sulfur (S)
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≤ 0.040
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Silicon (Si)
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0.10 – 0.35
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Copper (Cu)
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≤ 0.40
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Nickel (Ni)
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≤ 0.40
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Chromium (Cr)
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≤ 0.30
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Molybdenum (Mo)
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≤ 0.12
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Vanadium (V)
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≤ 0.08
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These elements provide the necessary mechanical strength and machinability for high-pressure applications.
Mechanical Properties of ASTM A105 Flange
ASTM A105 flanges are valued for their excellent mechanical performance under pressure and high-temperature environments. The mechanical properties are defined as:
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Property
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Value
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Tensile Strength
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≥ 485 MPa (70 ksi)
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Yield Strength
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≥ 250 MPa (36 ksi)
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Elongation
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≥ 22%
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Hardness
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≤ 187 HB (Brinell Hardness)
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Heat Treatment
No heat treatment is required except for flanges above 300 lbs class, special design flanges with unknown design pressure or design temperature, and flanges above 4 inches NPS and above 300 lbs class. If heat treatment is required, annealing, normalizing, normalizing and tempering, normalizing, quenching and tempering, etc. should be used.
ASTM Standards:
A266/A266M Specification for Carbon Steel Forgings for Pressure Vessel Components.
A675/A675M Specification for Carbon Steel Bars, Hot-Rolled, Special Quality and Mechanical Properties.
A696 Specification for Carbon Steel Bars, Hot-Rolled or Cold-Worked, Special Quality, for Pressure Piping Components.
A788/A788M Specification for Steel Forgings, General Requirements.
A961/961M General Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications.
FAQ – ASTM A105 Flange
1. What is ASTM A105 flange used for?
It is used in pressure systems at ambient and high temperatures, commonly in oil & gas, power, and petrochemical industries.
2. What does A105N mean?
A105N means the material has been normalized—heat-treated to improve strength and grain structure.
3. Is A105 suitable for low temperatures?
No, it is not recommended for low-temperature service. Use ASTM A350 LF2 instead.
4. What flange types are available in A105?
Weld Neck, Slip-On, Blind, Socket Weld, Threaded, and Lap Joint.
5. What are the common pressure classes?
Class 150, 300, 600, 900, 1500, and 2500 per ASME B16.5.
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