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  • A350 LF3 Flanges

Name:A350 LF3 Flanges
Specificaiton:ASTM A350
Size::1/2" to 60"
Rating:150Lb to 2500Lb
Steel Grade:A350 LF3
Seal Face:RF, RTJ, FF
Delivery term:FOB, CNF, CIF and EXW
Payment Term:TT or LC At sight
Loading Port:XINGANG
Deliver mode:By Sea, By Air and By Land
Packing:Standard seaworthy/airworthy packing
Standard:ANSI, JIS, BS, EN, DIN

Product Description

A350 LF3 Flanges

The A350 LF3 material is often referred to as  Low Temp Carbon Steel Fittings or Flanges.                                                       

A350 LF3 is a carbon steel fitting material, that is used in general industrial applications and can withstand continuous service down to -140F.  This material is supplied in a normalized condition and then Charpy V-Notch tested at -150F.

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 LF3 Flange Types

Raised Face Weld neck flanges, Raised Face slip on flanges, Raised Face socket welding flanges, Raised Face threaded flanges, Raised Face blind flanges, Raised Face slip on plate flanges, long weld neck flanges, orifice flanges, and raised face lap joint flanges, etc.

A350 LF3 Flange Specification

ASME B16.5, ASME B16.47

A350 LF3 Flange Ratings

150#, 300#, 400#, 600#, 900#, 1500#, 2500#

A350 LF3 Flange Dimensions

A350 LF3 Flange Weight


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.


ASTM A350 LF3 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.


ASTM A350 LF3 is readily weldable by any technique

A350 LF3 Flange Chemical Composition




0.20  0.35%








<0.30 %










A350 LF3 Flange Mechanical Property Requirements

Tensile Strength

Yield (0.2%)


Reduction of Area


Hardness HB








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