The customer send inquiry about ASME B16.5 blind flanges in material of ASTM A350 LF2 & A182 F316L , and with addtional requirement of drill a center hole in NPT. After replying them with quotation,they didn’t have any comment on it during the first several weeks .
However, they kept asking me some question about orders which is not ours, like: I consulted other suppliers about ASTM A350 LF2 Blind Flanges ,why couldn’t they offer me quotation….Because we also manufacture the items they have question with, I confirmed these questions with our factory and solved their queries.In the end, I get several purchase orders from this value customer.
Purchase Order List
| Short Description of Goods | Quantity | Unit |
| Blind Flange, ASTM A350 GR.LF2,RF,CL900,DN200,1/2IN NPT Flanges | 2 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,CL300,DN40,1/2IN NPT Flanges | 1 | PCS |
| Blind Flange. ASTM A350 LF2,RF,LT,CL300,DN50,1IN NPT Flanges | 4 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN40,3/4IN NPT Flanges | 1 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL150,DN40,1/2IN NPT Flanges | 1 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL1500,DN40,1IN NPT Flanges | 1 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN50,1/2IN NPT Flanges | 3 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL600,DN50,1/2IN NPT Flanges | 2 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL300,DN50,2IN NPT Flanges | 1 | PCS |
| Blind Flange, ASTM A350 LF2,RF,CL300/600,1/2IN NPT,DN15 Flanges | 3 | PCS |
| Blind Flange, ASTM A350 LF2,RF,CL300,1/2IN NPT,DN150 Flanges | 1 | PCS |
| Blind Flange, ASTM A350 GR.LF2,RF,LT,CL900,DN200 Flanges | 2 | PCS |
| Blind Flange, ASTM A 182 F316/316L,RF,CL300,DN20 Flanges | 4 | PCS |
| TOTAL | 26 | PCS |
Summary: As you can see, the items of this order are all ASTM A350 LF2 blind pipe flanges and ASTM A182 F316 blind flanges,here are their detailed specification of manufacturing.
ASTM A350 GRADE LF2 Flanges Properties
The ASTM A350 LF2 flanges is a forged carbon/ low-alloy steel forged flanges, this material is also for forged fittings and valves intended primarily for low-temperature service and requiring notch toughness testing.
Chemical Composition %
| C | Mn | P | S | Si | Ni | Cr | Mo | Cu | Nb | V |
| ≤ 0.30 | 0.60~1.35 | ≤ 0.035 | ≤ 0.040 | 0.15~0.30 | ≤ 0.40 | ≤ 0.30 | ≤ 0.12 | ≤ 0.40 | ≤ 0.02 | ≤ 0.08 |
Mechanical Properties
| Tensile Strength, ksi [MPa] | Yield strength, ksi [MPa], min. | ELr, min. % | ELs, min. % | ELc, min. % | Reduction of Area, min. % | Hardness, max. HBW |
| 70-95 [485–655] | 36 [250] | 22 | 30 | 48t + 15 | 30 | 197 |
ASTM A182 F316 /F316L ASME B16.5 Flanges Properties
Stainless steel grade 316/316L is the most commonly used austenitic stainless steel in the chemical process industry. The addition of molybdenum increases general corrosion resistance, improves chloride pitting resistance and strengthens the alloy in high temperature service. Through the controlled addition of nitrogen it is common for 316/316L to meet the mechanical properties of 316 straight grade, while maintaining a low carbon content.Flanges in material A350 LF2 is better than it is in A182 F316/316L in every term.
Chemical Composition %
| Ni | Cr | Mo | Mn | Si | C | S | P | N | Fe | |
| MIN | 10.0 | 16.0 | 2.0 | – | – | – | – | – | – | – |
| MAX | 14.0 | 18.0 | 3.0 | 2.0 | 0.75 | 0.03 | 0.03 | 0.045 | 0.1 | Balance |
Physical Properties
Density: 0.285 lb/inch3
Poisson’s Ratio: 0.3
Electrical Resistivity: 445 Ohm-circ mil/ft
| Temperature, °F | Coefficient* of Thermal Expansion, in/in°F x 10-6 | Thermal Conductivity Btu • ft/ft2 • hr • °F | Modulus of Elasticity Dynamic, psi x 106 |
| 70 | – | 7.8 | 29 |
| 212 | 9.2 | – | – |
| 932 | 10.1 | – | – |
| 1832 | 10.8 | – | – |
Mechanical Properties
| Ultimate Tensile Strength, ksi | 0.2% Yield Strength, ksi | Elongation, % | Hardness MAX, Brinell |
| 75 | 30 | 40 | 217 |
We are manufacture of all kinds of ANSI / ASME B16.5 flanges (Blind, Socket Weld, Slip On, Weld Neck, Threaded, Ring Type Joint).
Specification of ASME B16.5 Flanges
| Sealing Face | RF, FF, FTJ |
| Size Range | 1/2” – 48” / DN15 – DN1200 |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500lb |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
Service and quality are always our goal for customers.
