ASTM A350 LF2 Flanges,ASME B16.5,A350 LF2 Weld neck flange,A350 LF2 Low temperature Service Flanges
We are a professional manufacturer of steel forged flange in China,ASTM-A-350-LF2 Flange ,A350 LF2 Weld Neck Flange,A350 LF2 Blind flange,A350 LF2 Slip on Flange,A350 LF2 Flange NACE MR 0175 .
As a experienced A350 LF2 Flange manufacturer,we are producing high quality ASTM A350 LF2 LTCS Flange, A350 LTCS LF2 Pipe Flanges
ASTM A350 LF2 is a low-temperature carbon steel material widely recognized for its exceptional toughness, impact strength, and corrosion resistance in cryogenic and low-temperature applications. As part of the ASTM A350 specification, LF2 is specifically designed for use in environments where temperatures can drop below -50°F (-45°C), making it suitable for industries such as oil and gas, petrochemical, chemical processing, and power generation.ASTM A350 LF2 is a low-temperature carbon steel material widely recognized for its exceptional toughness, impact strength, and corrosion resistance in cryogenic and low-temperature applications. As part of the ASTM A350 specification, LF2 is specifically designed for use in environments where temperatures can drop below -50°F (-45°C), making it suitable for industries such as oil and gas, petrochemical, chemical processing, and power generation.
ASTM A350 LF2 flange is usually used for a general low temperature enviorement,it can withstand continuous service down to -46°C [-50°F],and A350 LF2 Flanges (low-temperature carbon steel) is used in the pipeline to match ASTM A333 Grade 6 pipes and A420 WL6 Pipe fittings.
Learn more about A350M Standard
ASTMA350-A350M-18
Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components
ASTM A350 LF2 Flanges are manufactured to corresponding ASME or API dimensional standards. The forgings may be made from ingots, blooms, billets, slabs or bars through hot-forging process. The steel shall be fully killed and fine-grain. ASTM A350 covers several grades and classes: Grade LF1, Grade LF2, Grade LF3, Grade LF5, Grade LF6, Grade LF9, Grade LF787; and Class 1, Class 2, Class 3.
ASTM A350 LF2 Flange composition
| STEEL DESIGNATION | CHEMICAL COMPOSITION | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SYMBOLIC | C max |
Mn | Si | P max |
S max |
Cr max |
Mo max |
Cu max |
Ni max |
V max |
Nb max |
| ASTM A350 – LF2 | 0,30 | 0,60 -1,35 | 0,15- 0,30 | 0,035 | 0,040 | 0,30 | 0,12 | 0,40 | 0,40 | 0,08 | 0,02 |
ASTM A350 LF2 CE Requirement
The sum of Cu, Ni, Cr, V, and Mo shall not exceed 1.00% on heat analysis. The sum of Cr and Mo shall not exceed 0.32% on heat analysis. By agreement, the limit for Nb may be increased up to 0.05 % on heat analysis and 0.06 % on product analysis. The carbon equivalent CE = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. For both Class 1 and Class 2 of ASTM A350 LF2, if the maximum thickness of the work piece is less than or equal to 2″, the CE shall not exceed 0.47; if the the maximum thickness of the work piece is greater than 2″, the CE shall not exceed 0.48.
ASTM A350 LF2 MECHANICAL CHARACTERISTICS
| 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 | |
| QUALITY | HEAT TREATMENT | SURFACE |
|---|---|---|
| ASTM A350 – LF2 | Normalised | rolled peeled h13 forged turned |
ASTM A350 Grade LF2 Flange manufacturing process
Forging Temperature for this material should be 900 – 1200oC
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.
ASTM A350 Grade LF2 Flange 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
Normalising – Heat to 860 – 920°C for a time commensurate with ruling section, Air cool (If Required)
Hardening – Heat to 890 – 960oC for a time commensurate with ruling section and quench in Water.
Tempering – Re-heat to 590oC 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 LF2 Flange Hardness requirement
the hardness to be 197 HB maximum and this meets the requirements for carbon steel forgings in NACE MR0175/ISO 15156-2.
ASTM A350 LF2 Flanges Weldability
A350 LF2 flanges is readily weldable by any technique
A350 LF2 Flange with Charpy V-Notch Impact Test,comply with NACE MR 0175 requirement
Charpy V-notch impact test is required for ASTM A350 LF2 Flange to determine the notch toughness of the work piece. The Charpy V-notch impact test shall be conducted in accordance with ASTM A370 or ASTM A1058. Standard test specimens shall be prepared first, the cross section of which shall be 10 mm x 10 mm. Three pieces of test specimens of each heat lot shall be prepared. Generally, theminimum applicable temperaturefor Class 1 of ASTM A350 LF2 is -46°C [-50°F], while it is 0°C [-18°F] for Class 2 of ASTM A350 LF2. The minimum applicable temperatures are also the standard impact test temperatures for standard-size specimens.
| Grade & Class | Eavmin. ft*lbf [J] |
Eeamin. ft*lbf [J] |
|---|---|---|
| LF2 Class 1 | 15 [20] | 12 [16] |
| LF2 Class 2 | 20 [27] | 15 [20] |
*Eav: minimum average impact energy required for each set of 3 specimens; *Eea: minimum impact energy for each specimen.
We also provide ASTM A105 & ASTM A350-LF2 Flanges DUAL CERTIFIED.
- A105 and A350-LF2 are standard specifications for forged carbon steel piping components. A105 for ambient and higher-temperature service; A350-LF2 for low-temperature service with Charpy V-Notch impact energy testing. Components include
- flanges, various fittings and valves.
ASTM A350 LF2 Flange product specificiations:
- Product Name: RF WN FLANGE SCH STD ASTM A350 LF2 /RTJ WN FLANGE ASTM A350 LF2
- Size:2in/4in/6inch/8in/10in/12in/16in/18in/20in/24in/28in/30in/32in
- Bore: STD/SCH80/SCH XS/SCH160
- Class: 150/300/600/900/1500 lbs
- Face: Raised face/Ring joint RTJ
- Material: Low temperature steel ASTM A350 LF2 CL1 & ASTM A350 LF2 CL1
- standard:ASME B16.5 ASME B16.47 A series /B series
How to order our A350 LF2 Flanges?
Example#1,ASTM A350 LF2 WN RF Flange,NACE 300# SCH.STD DN300(12″)
Example#2, ASTM A350 LF2 CL 1 BLIND FLANGE, NACE,RF CL150, 12 INCH
FlgWN, A350LF2, CL2500, RTJ, 16IN 2.375W, B16, Flange – Weld Neck Carbon Steel Per ASTM A350 Grade LF2 ASME Class 2500 Ring Type Joint 2.375 Inch
6IN FlgBlnd, A350LF2, CL2500, RTJ, B16.5, Flange – Blind Carbon Steel Per ASTM A350 Grade LF2 ASME Class 2500 Ring Type Joint Per ASME B16.5 Material Shall Meet the Requirements of NACE MR0175 Marked per MSS SP 25
