Name: ASTM A182 F51 Flange UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange
Brand: Yuhong Group Co.,Ltd
SKU: ASTM A182 F51 Duplex Steel WNRF Flange
Price: 150000 USD
Availability: InStock

Yuhong Holding Group Co.,LTD

English

Home

Products

About Us

Factory Tour

Quality Control

Company News

Home Products Steel Flange

ASTM A182 F51 Flange UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange

Product Details:

Place of Origin:	CHINA
Brand Name:	YUHONG
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:	ASTM A182 F51 Duplex Steel WNRF Flange

Payment & Shipping Terms:

Minimum Order Quantity:	1PC
Packaging Details:	Ply-wooden Case/Pallet
Delivery Time:	7 DAYS
Payment Terms:	L/C,T/T

Contact Now

All Products

Stainless Steel Seamless Pipe (350)

Stainless Steel Seamless Tube (345)

Duplex Stainless Steel Pipe (137)

Duplex Stainless Steel Tube (39)

Needle Tube (172)

Fin Tube (748)

Heat Exchanger (41)

Heat Exchanger Tube (478)

Heat Exchanger Tube Bundle (55)

Heat Exchanger Tubesheet (130)

Heat Exchanger Baffle (39)

Air Cooler (14)

Pressure Vessel (4)

Stainless Steel Welded Pipe (62)

Stainless Steel Welded Tube (134)

Nickel Alloy Pipe (276)

Nickel Alloy Tube (109)

Copper Alloy Tube (258)

Alloy Steel Tube (223)

Titanium Tube (22)

Bright Annealed Tube (166)

Boiler Tube (163)

Steel Fitting (880)

Steel Flange (682)

Others (412)

Cladding Parts (9)

Detailed Product Description

Product Name:	Duplex Steel Flange	Dimension:	ASME B16.5, ASME B16.47, ASME B16.48
Standard:	ASTM A182 / ASME SA182	Material:	F51, UNS S31803
O.D.:	1/2" To 48"	Class:	150#, 300#, 400#, 600#, 900#, 1500#, 2500#
Flange Face:	FF, RF, RTJ
High Light:	ASTM A182 F51 Duplex Steel Flange, Duplex S31803 Weld Neck Flange WNRF

ASTM A182 F51 / UNS S31803 Duplex Steel Weld Neck Flange ASME B16.5 Forged WNRF Flange

ASTM A182 F51 UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange is a high-strength, corrosion-resistant pipe connecting component manufactured via the forging process. It features a long, tapered hub (weld neck) that transitions smoothly into the pipe wall, a raised face (RF) sealing surface, and is designed to be butt-welded to the end of a piping system. It is specifically produced to meet the material requirements of ASTM A182 Grade F51 (which corresponds to UNS S31803), a standard specification for forged or rolled duplex stainless steel.

ASTM A182 F51 / UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange

C	Mn	Si	P	S	Cr	Mo	Ni	N	Fe
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

ASTM A182 F51 / UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange

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

Other Types of Duplex Steel Flange

Duplex 2205 Flanges	EN TYPE	DIN
WN – Welding Neck	EN-TYPE 11	DIN 2631
		DIN 2632
		DIN 2633
		DIN 2634
		DIN 2635
BL – Blind	EN-TYPE 05	DIN 2527
SO – Slip On	EN-TYPE 01/12
LJ – Lap Joint	EN-TYPE 02/04	DIN 2641
		DIN 2642
		DIN 2655
		DIN 2656
LWN – Long Welding Neck / Integral	EN-TYPE 21
Welding Collars	EN-TYPE 32/34
Super Duplex 2507 Flat Flange for Welding		DIN 2573
Super Duplex 2507 Flat Flange for Welding		DIN 2576
SW – Socket Weld	EN-TYPE 14
THR – Threaded	EN-TYPE 13	DIN 2566
Super Duplex 2507 Lap Joint Short Stub End		DIN 2673

Dimensional & Pressure Standards
While the material is controlled by ASTM A182, the dimensions and pressure ratings are controlled by separate piping codes:

ASME B16.5: Covers WN flanges from NPS ½" up to NPS 24" for Classes 150, 300, 600, 900, 1500, and 2500.
ASME B16.47: Covers larger flanges (NPS 26" to 60") in Series A (MSS SP-44) or Series B (API 605).
Bore Schedule: The weld neck flange's inside diameter (bore) must match the pipe's schedule (e.g., Sch 40, Sch 80, Sch 160, or XXS) to ensure a seamless butt-weld connection.

Application
Due to its high strength and exceptional resistance to chloride pitting and stress corrosion cracking, this specific flange is widely used in:

Offshore Oil & Gas: Subsea manifolds, topside piping, and riser systems.
Chemical Processing: Heat exchangers and piping handling acetic, formic, and phosphoric acids.
Pulp & Paper Industry: Digester blow lines and recovery boilers.
Desalination Plants: High-pressure seawater reverse osmosis (SWRO) piping.
FGD (Flue Gas Desulfurization): Systems in coal-fired power plants.

ASTM A182 F51 Flange UNS S31803 Duplex Steel Weld Neck Flange Forged WNRF Flange