ASTM A350 LF2 CL1 Weld Neck Flanges Raise Face(RF）ASME B16.5
ASTM A350 (ASME SA350) is the standard specification for carbon steel and low alloy steel forged flanges and flanged fittings for low temperature services.
ASTM A350 LF2 is one of the most popular grade for the forgings,flanges,fittings specially used for low temperature environment.
There are 2 grades in ASTM A350 LF2 material grade.ASTM A350 LF2 CL1 &ASTM A350 LF2 CL2.
Class 1 and Class 2 of ASTM A350/ ASME SA-350 grade LF2 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 difference between Class 1 and Class 2 in accordance with ASME SA 350 for LF2 is Charpy impact requirements
for LF2 Cl.1 – the minimum Charpy impact is 15 ft-lbs @-50 deg F
for LF2 Cl.2 – the minimum Charpy impact is 20 ft-lbs @0 deg F
ASTM A350 Grade LF2 Class 1 is a steel grade for carbon and low alloy steel forgings, requiring notch toughness testing for piping components. This includes forged flanges, fittings, valves and similar forged and machined parts. This specification covers requirements such as chemical composition, mechanical properties and impact test for notch toughness.
We supply high quality of ASTM A350 Grade LF2 Class 1 Flanges according to ASME B16.5 ASME B16.47 EN 1092-1
Carbon Steel ASTM A350 LF2 Flanges Chemical Composition:
| C% | Mn% | P% | Si% | Ni% | S% | Cr% |
| 0.30 max | 0.6/1.35 | .035 max | .15/.30 | 0.40 max | .040 max | 0.30 max |
MECHANICAL CHARACTERISTICS (ASTM A350M-07)
| STEEL | ||||||
| SYMBOLIC | NUMERIC | Re min | Rm | A min | Z min | Kv -46°C cl.1 |
| N/mm2 | % | % | J | |||
| ASTM A350 – LF2 | 250 | 485 ÷ 655 |
22 | 30 | 27 | |
A350 LF2 Cl1 Weld neck Flanges or welding neck flange is well recognised for its long-tapered hub, which provides mechanical strength (useful to resist ‘dishing’ and ‘bowing’). Welding neck flanges are high integrity flanges and are available in all sizes, all common face types (flat, raised, RTJ), and all classes
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
