Product Description
ASTM A350 LF2 LOW TEMPERATURE CARBON STEEL PIPE FLANGES
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The A350 LF2 material is often referred to as Low Temp Carbon Steel Fittings or Flanges.
A350 LF2 is a carbon steel fitting material, very similar to A105, that is used in general industrial applications and can withstand continuous service down to -46F. This material is supplied in a normalized condition and then Charpy V-Notch tested at -50F.
The Charpy testing is used to reveal a materials natural ductile to brittle transition as temperature decreases. A test sample is brought down to temperature, notched and then struck by a pendulum device. The device measures the amount of energy absorbed by the material until failure occurs
A350 LF2 Flange Types
Raised Face Welding neck flanges
Raised Face slip on flanges
Raised Face socket welding flanges
Raised Face threaded flanges
Raised Face blind flanges
Raised Face slip on flanges
Raised Face plate flanges
Long weld neck flanges
Orifice flanges and
Raised Face lap joint
A350 LF2 Flange Specification
ASME B16.5, ASME B16.47
A350 LF2 Flange Ratings
150#, 300#, 400#, 600#, 900#, 1500#, 2500#
A350 LF2 Flange Dimensions
A350 LF2 Flange Weight
Forging
Forging Temperature for this material should be 900 – 1200 °C
Soak times should be kept to a minimum to avoid heavy scaling, but sufficient time should be given to allow centre
to achieve furnace temperature.
After forging pieces should be allowed to cool in still air.
Heat Treatment
Normalizing– Heat to 860 – 920°C for a time commensurate with ruling section, Air cool (If Required)
Hardening– Heat to 890 – 960 °C for a time commensurate with ruling section and quench in Water.
Tempering– Re-heat to 590 °C Minimum as required, dependent on final required properties.Hold for a time
commensurate with the ruling section and cool in still in air.
Machining
ASTM A350 LF2 has good to very good machinability, dependent on condition, and operations such as sawing,
turning,broaching, milling etc can be accomplished satisfactorily using standard machine tool manufacturers
recommended speeds and feeds.
Welding
ASTM A350 LF2 is readily weldable by any technique
A350 LF2 Flange Chemical Composition
Carbon
<0.30%
Silicon
0.15 – 0.30%
Manganese
0.60 – 1.35%
Phosphorous
<0.035%
Sulphur
<0.040%
Chromium
<0.30 %
Molybdenum
<0.12%
Copper
<0.40%
Niobium
<0.02%
Vanadium
<0.08%
A350 LF2 Flange Mechanical Property Requirements
Tensile Strength
Mpa
Yield (0.2%)
MpA
Elongation
%
Reduction of Area
%
Charpy
J
-46°C
Hardness HB
485-655
(70-95KSi)
>250
(36KSi)
>22
>30
>20
<197HB
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