ASTM A350 LF3 Low Temperaturer Steel Pipe Flanges

Zhongji Pipe Industry Is A Premier Suppleir For Your ASTM A350 LF3 Pipe Flanges Needs.

The A350 LF3 (3.5% nickel steel) material is often referred to as Low Temp Steel Fittings or Flanges.                                                       

A350 LF3 is a nickel alloy steel fittings 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 

ASTM A350 LF3 Pipe 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
• Raised face lap joint flanges, etc.

ASTM A350 LF3 Pipe Flange Specification

ASME B16.5, ASME B16.47

ASTM A350 LF3 Pipe Flange Ratings

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

ASTM A350 LF3 Pipe Flange Dimensions

ASTM A350 LF3 Pipe Flange Weight

3.5% Nickel Steel 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. 

3.5% Nickel Steel 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.

3.5% Nickel Steel Machining

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.

3.5% Nickel Steel Welding

ASTM A350 LF3 is readily weldable by any technique

ASTM A350 LF3 Pipe Flange Chemical Composition

Carbon	<0.20%
Silicon	0.20 – 0.35%
Manganese	<0.90%
Phosphorous	<0.035%
Sulphur	<0.040%
Chromium	<0.30 %
Molybdenum	<0.12%
Copper	<0.40%
Niobium	<0.02%
Vanadium	<0.03%

 

ASTM A350 LF3 Pipe Flange Mechanical Property Requirements

Tensile Strength Mpa	Yield (0.2%) MpA	Elongation %	Reduction of Area %	Charpy J -101°C	Hardness HB
485-655 (70-95KSi)	>260 (36KSi)	>22	>35	>20	<197HB

 

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