ASTM A105N WNRF Carbon Steel Flange | ASME B16.5
ASTM A105 weld neck flanges, supplied in the normalized condition (A105N), are forged carbon steel flanges designed for high-pressure and high-temperature piping systems.
Manufactured in accordance with ASME B16.5, Weld Neck Raised Face (WNRF) flanges provide excellent structural integrity, smooth stress transition, and reliable sealing performance.
ASTM A105N WNRF flanges are among the most widely used carbon steel flanges in oil & gas, petrochemical, power generation, and industrial piping applications.
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What Is ASTM A105 / A105N?
ASTM A105 is a standard specification covering forged carbon steel piping components for ambient and high-temperature service.
The suffix “N” indicates the material is supplied in the normalized condition, which improves:
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Grain structure uniformity
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Mechanical strength and toughness
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Consistency and reliability in pressure service
For pressure-rated flanges, ASTM A105N is the industry-standard requirement.
ASTM A105 is one of the most common forging grade used for high-temperature service,
Weld Neck Raised Face (WNRF) Design
Weld neck flanges feature a long tapered hub that is butt-welded to the pipe, providing:
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Smooth stress distribution
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Excellent fatigue resistance
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Superior performance under pressure and temperature fluctuations
The raised face (RF) sealing surface is compatible with standard spiral wound and soft gaskets, making WNRF flanges suitable for most pressure piping systems.
Dimensions & Standards
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Material Standard: ASTM A105 / ASME SA105
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Heat Treatment: Normalized (A105N)
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Flange Standard: ASME B16.5
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Facing: WNRF (Raised Face)
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Pressure Classes:
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Class 150
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Class 300
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Class 600
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Class 900
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Class 1500
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Class 2500
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Size Range: 1/2″ – 24″
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Manufacturing Process: Forged
ASTM A105 This specification covers standards for forged carbon steel piping components, that is, flanges, fittings, valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions
ASTM A105 Equivalent grade
CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS
| QUALITY | EUROPE | GERMANY | FRANCE | SPAIN | G.B. | USA | |
|---|---|---|---|---|---|---|---|
| EN | DIN | W.n. | AFNOR | UNE | B.S. | AISI/SAE | |
| ASTM A105 | ~S355JR | ||||||
A105 CHEMICAL COMPOSITION % (ASTM A105)
| STEEL DESIGNATION | CHEMICAL COMPOSITION | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SYMBOLIC | C max |
Si | Mn | P max |
S max |
Cu max |
Ni max |
Cr max |
Mo max |
V max |
Nb max |
Cu + Ni + Cr + Mo max |
Cr + Mo max |
| ASTM A105 | 0,35 | 0,10 ÷ 0,35 | 0,60 ÷ 1,05 | 0,035 | 0,040 | 0,40 | 0,40 | 0,30 | 0,12 | 0,08 | 0,02 | 1,00 | 0,32 |
| STEEL QUALITY | TENSILE TESTING | ||||
|---|---|---|---|---|---|
| UNIFIED TENSILE STRENGTH R |
DEVIATION FROM PROPORTIONALITY Rp 0,2 min |
ELONGATION A min |
C min |
HB max |
|
| N/mm2 | N/mm2 | % | % | ||
| ASTM A105 | 485 | 250 | 22 | 30 | 187 |
ASTM A105 VS ASTM A105N ？
A105N is the A105 material with Normalized.
A105 Flange 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.
A105 Flange Hardness requirement NACE MR0175
A105 Flange should be with a Brinell hardness not exceed than 187 according to NACE MR0175
How to order the A105 Flanges,
Example#1,ASTM A105 Weld Neck Flange,Raise Face, 3 Inch, 150 LB
Example#2,ASTM A105N Weld Neck Flange,Raise Face, 8 Inch, 150 LB
