4"FLANGE, BL, FF, CL150LB ASME B16.5, THICKNESS 80S,Steel CNC Machining Double Blind Flange,ASTM A350 LF1
Grades of ASTM A350 Carbon Steel Flanges
ASTM A350 LF1 Flange
The ASTM A350 Grade LF1 Flange is a material specification for carbon and low alloy steel forgings that calls for notch toughness testing on piping components. Forged flanges, fittings, valves, and other forged and machined parts are included. Chemical structure, mechanical properties, and impact tests for notch durability are all covered in this specification.
ASTM A350 LF2 Flange
The ASTM A350 LF2 is a forged carbon/low-alloy steel grade of forged flanges, forged fittings, and forged valves that are intended for low-temperature operation and must pass notch durability inspection. The LF2 steels are divided into two classes: Class 1 and Class 2.
ASTM A350 LF3 Flange
Flanges made to ASTM A350 LF3 requirements can withstand temperatures as low as 150 degrees Fahrenheit (LF3.) These ASTM A350 LF3 Flanges are primarily used in high-energy/high-temperature channeling applications. All ASTM A350 LF3 Flanges are available with either a raised face or a flat face. At ambient temperature, the working pressure for a B16.5 ASTM A350 LF3 Flange is approximately 2.4 times the Flange Class.
ASTM A350 LF1 LF2 LF3 Carbon Steel Flanges Chemical Composition
Element | Weight % |
Carbon | 0.08 – 0.15 |
Silicon | 0.15 – 0.50 |
Manganese | 0.30 – 0.60 |
Phosphorus | 0.025 max * |
Sulfur | 0.025 max * |
Molybdenum | 0.90 – 1.10 |
Chromium | 2.00 – 2.50 |
Nickel | 0.5 max |
ASTM A350 LF1 LF2 LF3 Carbon Steel Flanges Mechanical Properties
Property | Values |
Ultimate Tensile Strength * | 95 min Ksi (655 Mpa) |
0.2 % Yield Strength * | 75 min Ksi (517 Mpa) |
Elongation * | 17 % min |
Reduction of Area * | 35 % min |
Charpy Impact Toughness | 42 mean/ 33 min J at –18o C |
Hardness | 197 – 237 BHN (75 Ksi min) |
Specifications | ASTM A350 LF2 / ASME SA350 |
Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
Size Range | 1/2″ (15 NB) to 48″ (1200NB) DN10~DN5000, as per Customer Requirements |
Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
Surface | pickling, annealing, bright, sandblast, hairline |
Type | Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 WNRF Flanges, Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 Blind Flanges, Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 Threaded Flanges, Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 Slip On Flanges, Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 Blind Flanges, Carbon Steel A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 Lap Joint Flanges |
Connection type | Raised Face, Flat Face, Ring Type Joint, Lap-Joint Face, Large Male-Female, Small Male-Female, Large Tongue, Groove, Small Tongue, Groove. |
Test Certificates | EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc |
ASTM A350 LF1 LF2 LF3 Carbon Steel Flanges Dimensions
Nominal Pipe Size | Flanges Inside Diameter (ID) (inch) | Flanges Outside Diameter (OD) (inches) |
Class 150 | Class 300 | Class 400 | Class 600 | Class 900 |
1/2 | 0.84 | 1.875 | 2.125 | 2.125 | 2.125 | 2.50 |
3/4 | 1.06 | 2.25 | 2.625 | 2.625 | 2.625 | 2.75 |
1 | 1.31 | 2.625 | 2.875 | 2.875 | 2.875 | 3.125 |
1 1/4 | 1.66 | 3 | 3.25 | 3.25 | 3.25 | 3.50 |
1 1/2 | 1.91 | 3.375 | 3.75 | 3.75 | 3.75 | 3.875 |
2 | 2.38 | 4.125 | 4.375 | 4.375 | 4.375 | 5.625 |
2 1/2 | 2.88 | 4.875 | 5.125 | 5.125 | 5.125 | 6.50 |
3 | 3.50 | 5.375 | 5.875 | 5.875 | 5.875 | 6.625 |
4 | 4.50 | 6.875 | 7.125 | 7.00 | 7.625 | 8.125 |
5 | 5.56 | 7.75 | 8.50 | 8.375 | 9.50 | 9.75 |
6 | 6.62 | 8.75 | 9.875 | 9.75 | 10.50 | 11.375 |
8 | 8.62 | 11 | 12.125 | 12.00 | 12.625 | 14.125 |
10 | 10.75 | 13.375 | 14.25 | 14.125 | 15.75 | 17.125 |
12 | 12.75 | 16.125 | 16.625 | 16.50 | 18.00 | 19.625 |
ASTM A350 LF1 LF2 LF3 Carbon Steel Flanges Related Types
ASTM A350 LF1 LF2 LF3 Carbon Steel Flanges Types
Product | Size |
A350 LF1, LF2, LF3 LTCS Slip-On Flanges | A350 LF1, LF2, LF3 LTCS Threaded Flanges | 1/2″ – 48″ Raised Face or Flat Face |
A350 LF1, LF2, LF3 LTCS Blind Flanges | A350 LF1, LF2, LF3 LTCS Reducing Flanges |
A350 LF1, LF2, LF3 LTCS Lap Joint Flanges | A350 LF1, LF2, LF3 LTCS Plate Flanges |
A350 LF1, LF2, LF3 LTCS Weld Neck Flanges | A350 LF1, LF2, LF3 LTCS Socket Weld Flanges |


Related Products

FAQ
1.How can I get the price? |
-We usually quote within 24 hours after we get your inquiry(Except weekend and holidays). -If you are very urgent to get the price, please email us or contact us in other ways so that we can offer you a quote. |
2. Can I buy samples placing orders? |
-Yes.Please feel free to contact us. |
3.What is your lead time? |
-It depends on the order quantity and the season you place the order. -Usually we can ship within 7-15 days for small quantity, and about 30 days for large quantity. |
4.What is your payment term? |
-T/T,Western Union,MoneyGram,and Paypal.This is negotiable. |
5.What is the shipping method? |
-It could be shipped by sea,by air or by express(EMS,UPS,DHL,TNT,FEDEX and ect). Please confirm with us before placing orders. |
6.How do you make our business long-term and good relationship? |
-1. We keep good quality and competitive price to ensure our customers benefit ; -2. We respect every customer as our friend and we sincerely do business and make friends with them,no matter where they come from. |