LTCS ASTM A350 LF2 Flanges A350 LF2 CL1 Slip On Flange RF ASME B16.5

We are a professional manufacturer and exporter of ASTM A350 LF2 Flanges A350 LF2 CL1 Slip On Flange RF ASME B16.5 in China.

Slip-on flanges, also known as ‘plate flanges’,it may have a hub or without hub, This type of flange is usually connected to a pipe by one or two fillet welds (one outside the flange and one inside the flange)

Slip-on flanges mainly used for fluids at low pressure or with little risk of leakage.

A350 LF2 CL1 Slip On Flange RF ASME B16.5

ASTM-A-350LF2 is one of the most common forged carbon/ low-alloy steel grade for forged flanges, forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing.

ASTM A350 / ASME SA-350 grade LF2 Class 1 & Class 2, Both of them  have the same chemical composition and mechanical properties. Even the allowable stresses of Class 1 and Class 2 in ASME Codes are the same. The main characteristic that distinguishes Class 1 from Class 2 is its minimum applicable temperature. The minimum applicable temperatures are -50°F [-46°C] for LF2 Class 1 and -0°F [-18°C] for LF2 Class 2, respectively. The minimum applicable temperature is also the standard Charpy V-notch impact test temperature.

So generally ASME SA-350 grade LF2 CL2 can be used even lower temperature than ASME SA-350 grade LF2 CL1 grade.

ASTM A350 LF2 Chemical Composition

C Mn P Si S
0.03 0.6-1.35 0.035 0.15-0.3 0.04

ASTM A350 LF2 Mechanical Properties

Tensile Strength Yield Strength Elongation
485 – 655 (Mpa) 250 Min (Mpa) 22  (%)

ASTM A350 Grade LF2 Heat treatment condition,

ASTM A350 Grade LF2 is a general Carbon steel usually supplied in the Normalised, Normalised and Tempered or Quench and Tempered condition.

ASTM A350 Grade LF2 Charpy V-Notch Energy Requirements for Standard Size [10 by 10 mm] Specimens

Minimum Impact Energy Required for Average of Each Set of Three Specimens, ft-lbf [J] Minimum Impact Energy Permitted for One Specimen only of a Set, ft-lbf [J]
LF2 Class 1 15 [20] 12 [16]
LF2 Class 2 20 [27] 15 [20]

Standard Impact Test Temperature for Standard Size [10 by 10 mm] Specimens

Grade Test Temperature, °F [°C]
LF2 Class 1 −50 [−46]
LF2 Class 2 −0 [−18]

 

ASTM A350 LF2 Cl1 Flanges specification
ASME B16.5  ASME B16.47  Slip On flange. 

Size: 1/2″/1“/2″/3″/4″/5″/6″/8″10″/12″/14″/16″/18″/20″/24″/28″/30″/32″/36″/48″

Thichkness:Sch40,Sch Std,Sch 80.SchXS,SchXXS,Sch100.Sch160

Class 150, 300, 400, 600, 900, 1500 and 2500

Flange Face:Raise Face.Flat Face,Ring joint

Material:ASTM A350 LF2