ASTM A182 GR. F51 Blind Flange,SA182 F51 BLRF Flange, Blind RTJ Flange,A182 F51 Bridas duplex stainless steel
The ASTM A182 Gr F51 Blind Flange, also known as SA182 F51 Duplex Stainless Steel Blind Flange, is manufactured in accordance with ASME B16.5 standards and is widely used in high-pressure and corrosive service applications. This blind flange is produced from Duplex Stainless Steel F51 (UNS S31803), offering excellent strength, corrosion resistance, and long-term reliability.
Product Description
ASTM A182 F51 Blind Flanges are designed to close the end of piping systems, valves, or pressure vessel openings. Compared with standard austenitic stainless steel flanges, Duplex F51 Blind Flanges provide higher yield strength and improved resistance to stress corrosion cracking, making them ideal for demanding environments.
We are a professional manufacturer of ASTM A182 F51 Blind flange in China.duplex stainless stainless steel A182 Duplex F51/F53/F44/F55/F60
ASTM A182 F51 is a forged duplex stainless steel grade corresponding to UNS S31803 (commonly known as Duplex 2205).
F51 is widely used for flanges, fittings, and forged components in offshore oil & gas, chemical process, desalination, and marine applications.
Standards : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
ASTM A182 GR. F51 Blind Flange, ASTM A182 GR. F51 Flange,SA182 F51 Flange, A182 F51 Bridas duplex stainless steel
China ASTM A182 F51 Blind Flange ,ASME /ANSI B16.5, B16.47 BLIND FLANGES SPECIFICATION
Technical Data Sheet of A182 F51 Bridas S31803 ,ASTM A182 F51 Flange,
ASTM A182 F51 Flange Chemical Composition Limits |
|||||||||
| Weight% | C | Mn | P | S | Si | Cr | Ni | Mo | N |
| Duplex A182 F51 Flange | 0.03 max | 2.0 max | 0.03 max | 0.02 max | 1 max | 21-23 | 4.5-6.5 | 2.5-3.5 | 0.80-0.20 |
ASTM A182 F51 Flange Duplex Stainless Steel combines improved resistance to stress corrosion cracking, pitting, crevice corrosion and high strength. Due to it’s chemical composition A182 F51 duplex stainless steel resists chloride environments and sulphide stress corrosion.
ASTM A182 F51 Flange Mechanical Properties
| GRADE | ASTM A182 F51 |
| Tensile strength | 620 min |
| Yield strength | 450 min |
| Elongation% | 25 min |
| Reduction of area% | 45 min |
ASTM A182 F51 Heat Treatment Requirement
Anneal – Heat to 1020 – 1120oC ensuring sufficient time is allowed for the centre to achieve furnace temperature and hold for a time commensurate with the ruling section, followed by water quenching
ASTM A182 F51 Flange hardness Requirement
ASTM A182 F51 flange should be with maxinum 290HB Brinell hardness
Our production scope:
ASTM/ASME/ANSIB16.5, B16.47, ASME/ANSIB16.48 flange
slip on flange, Weld Neck Flange Threaded Flange Blind Flange
Dimensions : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges etc.
Standards : ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Size : 1/8″ NB TO 48″NB.
Flange Face Type : Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
BS : BS4504 , BS4504, BS1560, BS10
Test Certificates: Manufacturer Test Certificate as per EN 10204 / 3.1
DIMENSIONAL TOLERANCES OF BLIND FLANGES ASME/ANSI B16.5
| Outside Diameter ≤ 24 = 1.6 mm | > 24 = ± 3.2 mm |
Inside Diameter not applicable |
| Diameter of Contact Face 1.6 mm Raised Face = ± 0.8 mm 6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm |
Outside Diameter of Hub ≤ 12 = + 2.4 mm / – 1.6 mm | ≥ 14 = ± 3.2 mm |
| Diameter of Counterbore not applicable |
Drilling Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm Eccentricity of Bolt Circle with Respect to Facing ≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max. |
| Thickness ≤ 18 = + 3.2 mm / – 0 | ≥ 20 = + 4.8 mm / – 0 |
Length thru Hub ≤ 18 = + 3.2 mm / – 0.8 mm | ≥ 20 = + 4.8 mm / – 1.6 mm |
How to order our ASTM A182 F51 Blind Flanges?
ASTM A182 F51 Blind Flanges,Raise Face,12IN FLANGE BLRF SCH-40S ASME B16.5 900#
ASTM A182 F51 FLANGE Blind SCH-40S ASME B16.5 3/4 IN 900# RTJ
Example Specification for Quotation
Product: Blind Flange
Standard: ASTM A182 / ASME SA182
Grade: F51 (Duplex 2205 / UNS S31803)
Type: Blind
Size: 6” Class 300
Facing: RF (Raised Face)
Heat Treatment: Solution Annealed & Water Quenched
Certification: EN 10204 Type 3.1
ASTM A182 F51 Blind Flange is a duplex stainless steel flange used to seal the end of a piping system or pressure vessel opening.
It is made from UNS S31803 / Duplex 2205 material, which combines the high strength of ferritic stainless steel with the excellent corrosion resistance of austenitic stainless steel.
These flanges are widely used in offshore, chemical, petrochemical, oil & gas, desalination, and marine environments, especially where chloride stress corrosion cracking and pitting resistance are critical.
