ASTM A182 F51 F53 F55 F44 Duplex Stainless Steel Flange

​​GNEE provides ASTM A182 F51, F53, F55, and F44 duplex stainless steel flanges, manufactured from advanced duplex and super duplex stainless steel alloys (including 2205, 2507, and S32760 grades).​​ These flanges are available in ​​customized sizes (DN15–DN600 or 1/2"–24"), pressure ratings (Class 150–2500), face types (RF, RTJ, etc.), and bolt hole configurations compliant with ASME B16.5/B16.47 standards​​. ​​Critical dimensions-including flange thickness (tolerance ±1.6mm), outer diameter (tolerance ±2.4mm), and bolt hole spacing (tolerance ±0.8mm)-are precisely controlled​​, and ​​each flange undergoes rigorous quality control, including ultrasonic testing (UT) for internal defect detection, magnetic particle testing (MT) or penetrant testing (PT) for surface defect evaluation, and material certification (MTC) verifying chemical composition, mechanical properties, and corrosion resistance​​.

UNS-S31803-Duplex-spectacle-blind-flange-asme-b16-48
1. Type of flanges:
ASTM A182 F51 F53 F55 F44  WN Flange
ASTM A182 F51 F53 F55 F44  SW Flange
ASTM A182 F51 F53 F55 F44  BL Flange
ASTM A182 F51 F53 F55 F44  SO Flange
ASTM A182 F51 F53 F55 F44 TH Flange
ASTM A182 F51 F53 F55 F44  LJ Flange
ASTM A182 F51 F53 F55 F44  LWN Flange

 

Specifications

Duplex Steel S31803 Pipe Flanges Specifications
Specifications	ASTM A182 / ASME SA182
Size	1/8″ NB TO 24″ NB
Standards	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.
Standard	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61

 

Duplex Steel S31803 / S32205 Pipe Flanges Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N	Fe
S31803	0.030 max	2.00 max	1.00 max	0.030 max	0.020 max	22.0 – 23.0	3.0 – 3.5	4.50 – 6.50	0.14 – 0.20	63.72 min
S32205	0.030 max	2.00 max	1.00 max	0.030 max	0.020 max	21.0 – 23.0	2.50 – 3.50	4.50 – 6.50	0.8 – 0.20	63.54 min

 

Duplex Steel S31803 / S32205 Plate Flanges Mechanical Properties

Grades	Density (g/cm 3)	Density (lb/in 3)	Melting Point (°C)	Melting Point (°F)
S31803 / S32205	7.805	0.285	1420 – 1465	2588 – 2669

 

Equivalent Grades for S31803 / S32205 Duplex Steel Industrial Pipe Flanges

STANDARD	WERKSTOFF NR.	UNS
Duplex 2205	1.4462	S31803 / S32205

 

Super Duplex Steel S32750 Pipe Flanges Specifications
Specifications	ASTM A182 / ASME SA182
Size	1/8″ NB TO 24″ NB
Standards	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.
Standard	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades	S32750 / S32760 / S32950

 

Super Duplex Steel S32750 / S32760 Pipe Flanges Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	N	Fe
S32750	0.030 max	1.20 max	0.80 max	0.035 max	0.020 max	24.00 – 26.00	3.00 – 5.00	6.00 – 8.00	0.24 – 0.32	58.095 min
S32760	0.05 max	1.00 max	1.00 max	0.030 max	0.010 max	24.00 – 26.00	3.00 – 4.00	6.00 – 8.00	0.20 – 0.30	57.61 min

 

Super Duplex Steel S32750 / S32760 Plate Flanges Mechanical Properties

Grades	Density (g/cm 3)	Density (lb/in 3)	Melting Point (°C)	Melting Point (°F)
S32750 / S32760	7.8	0.281	1350	2460

 

Equivalent Grades for S32750 / S32760 Super Duplex Steel Industrial Pipe Flanges

STANDARD	WERKSTOFF NR.	UNS
Super Duplex 2507	1.4410	S32750 / S32760

 

What is the difference between ASTM A182 F53 and F55?

Another difference between ASTM A182 F53 and F55 is the tensile strength. The tensile strength of ASTM A182 F53 is 860 MPa, while the tensile strength of ASTM A182 F55 is 930 MPa. This means that ASTM A182 F55 has a higher tensile strength than ASTM A182 F53.

 

Certificate Required
EN 10204 Type 3.1 as standard
EN 10204 Type 3.2 (if third-party inspection required)
Includes: Chemical, Mechanical, Heat Treatment, NDT, and PMI records