ASTM A105N Slip-On Raised Face Flange | ASME B16.5
Carbon Steel A105N SORF Flange
ASTM A105N slip-on raised face flanges (SORF) are forged carbon steel flanges designed for easy pipe alignment and cost-effective installation in pressure piping systems.
Manufactured to ASME B16.5, these flanges slip over the pipe and are welded on both the inside and outside, providing adequate strength for low to medium pressure applications.
Supplied in the normalized condition (A105N), these slip-on flanges offer improved mechanical consistency and reliability for pressure service.
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What Is ASTM A105 Slip On Flange?
ASTM A105 Slip On Flange is a forged carbon steel flange used in piping systems for connecting pipes, valves, pumps and pressure equipment.
Unlike weld neck flanges, slip-on flanges are installed by fitting over the pipe and welding on both sides.
Main features include:
- Easy pipe alignment
- Lower installation cost
- Simple fabrication process
- Suitable for many industrial piping systems
- Compatible with RF gasket sealing systems
ASTM A105 slip-on flanges are commonly selected where installation efficiency and economical fabrication are important.
ASTM A105 vs ASTM A105N Slip On Flange
ASTM A105 and ASTM A105N refer to the same base carbon steel forging specification, while A105N indicates normalized heat treatment condition.
| Item | ASTM A105 | ASTM A105N |
| Material | Forged Carbon Steel | Forged Carbon Steel |
| Standard | ASTM A105 | ASTM A105 |
| Heat Treatment | According to specification requirements | Normalized condition |
| Mechanical Consistency | Standard forging properties | Improved consistency after normalization |
| Common Application | General pressure piping | Higher reliability pressure service |
For projects requiring normalized carbon steel flange properties, ASTM A105N Slip On Flanges are commonly selected.
Slip-On Raised Face (SORF) Design
Slip-on flanges are designed to slide over the pipe and are fillet welded on both sides.
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Easy alignment during installation
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Lower cost compared with weld neck flanges
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Suitable for moderate pressure and temperature
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Raised face (RF) sealing surface compatible with spiral wound and soft gaskets
ASTM A105N SORF flanges are commonly selected where installation efficiency and economy are priorities.
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
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: SORF (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 Specification
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 |
Frequently Asked Questions
What is ASTM A105 Slip On Flange?
ASTM A105 Slip On Flange is a forged carbon steel flange designed for pressure piping systems and manufactured according to ASTM A105 material requirements.
What is ASTM A105N Slip On Flange?
ASTM A105N Slip On Flange is an ASTM A105 carbon steel slip-on flange supplied in normalized condition for improved mechanical consistency.
What does SORF mean in flange?
SORF means Slip On Raised Face Flange. It describes a slip-on flange with a raised face sealing surface.
What standard is used for ASTM A105 Slip On Flange?
ASTM A105 defines the forged carbon steel material, while ASME B16.5 defines flange dimensions, pressure classes and facing requirements.
Are ASTM A105 Slip On Flanges available with EN 10204 3.1 certificate?
Yes. EN 10204 3.1 material certificates and inspection documents can be supplied according to project requirements.
What sizes are available for A105 Slip On Flanges?
ASTM A105 Slip On Flanges are commonly supplied from 1/2″ to 24″ according to ASME B16.5. Larger sizes can be manufactured according to project requirements.
ASTM A105N Slip-On Raised Face Flange | ASME B16.5
ASTM A105N Slip on Flange
ASTM A105N slip-on raised face flanges manufactured to ASME B16.5 provide a cost-effective and reliable solution for pressure piping systems.
With normalized material condition, easy installation, and broad pressure class coverage, A105N SORF flanges are widely used in industrial and energy projects worldwide.
