ASTM A182 F22 Weld Neck Flange WNRF ASME B16.5 Blind Flange

ASTM A182 F22 Weld Neck Flange – Alloy Steel WN Flange Manufacturer & Supplier

ASTM A182 F22 Weld Neck Flange is a high-temperature alloy steel flange made from Chrome-Moly Alloy Steel (2.25% Cr – 1% Mo). F22 weld neck flanges are engineered for elevated-temperature and high-pressure service, offering excellent resistance to creep, oxidation, and thermal stress. They are widely used in refineries, petrochemical plants, boilers, heat exchangers, and power generation systems.

Manufactured according to ASME B16.5 / B16.47, F22 weld neck flanges feature a long tapered hub that ensures smooth stress distribution and reliable welded connections.

A182 F22 is a low-alloy steel that contains 2.25% chromium,ASTM A182 F22 alloy steel is a very deephardening, heat treatable alloy steel that contains nominally .12% Carbon, with 2.25% Chromium and 1.0% Molybdenum as the primary hardening elements. The popularity of ASTM A182 F22 alloy steel stems from its improved weldability over 4130 while maintaining good strength and excellent impact properties deeper into the product. Hardness levels up to 22 HRC are approved to NACE MR0175.

Grade	UNS Number	Typical Composition	Description / Use Case
F22	K21590	2.25% Cr – 1% Mo	Common in high-pressure steam and hydrogen services

ASTM A182 F22 Flange Specifications

Material Grade: ASTM A182 / ASME SA182 F22 (Class 1 / Class 3)
Manufacturing Type: Forged Alloy Steel
Flange Type: Weld Neck (WN),Blind Flange (BL),Slip on Flange(SO)
Standards: ASME B16.5, ASME B16.47 Series A/B, MSS SP-44
Pressure Ratings: Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
Size Range: 1/2″ – 48″
Face Type: RF (Raised Face), RTJ (Ring Type Joint)
Heat Treatment: Normalized & Tempered

Composition of ASTM A182 F22

Grade/Identification Symbol

UNS Designation

Composition, %

Carbon

Manganese

Phosphorus

Sulfur

Silicon

Nickel

Chromium

Molybdenum

Niobium

Titanium

Other Elements

F 22

K21590

0.05–0.15

0.30–0.60

0.04

0.5

…

2.00–2.50

0.87–1.13

…

Class 1

F 22

K21590

0.05–0.15

0.30–0.60

0.04

0.5

…

2.00–2.50

0.87–1.13

…

Class 3

Mechanical Property of ASTM A182 F22

Grade Symbol	Tensile Strength, min, ksi [MPa]	Yield Strength, min, ksi [MPa]<sup>B</sup>	Elongation in 2 in. [50 mm] or 4D, min, %	Reduction of Area, min, %	Brinell Hardness Number, HBW, unless otherwise indicated
F 22 Class 1	60 [415]	30 [205]	20	35	170 max

Heat Treatment of ASTM A182 F22 Flanges

Heat Treatment: Requires normalizing + tempering (typically 900–960°C normalizing, 690–730°C tempering).

Why Choose Our ASTM A182 F22 Weld Neck Flanges

Precision-forged for excellent strength and material integrity
Manufactured to ASME, ASTM, and ISO standards
100% PMI, UT, and dimension inspection
Available in RF / RTJ designs
Fast delivery for project-based and bulk orders
EN 10204 3.1 Mill Test Certificates provided

Order example of ASTM A182 F22 Flanges

Product: ASTM A182 F22 Weld Neck Flange
Type: WN Flange, Raised Face (RF)
Standard: ASME B16.5
Material Grade: F22, Class 2 (Cr-Mo Alloy Steel)
Pressure Rating: Class 600
Size: 6″ (DN150)
Schedule: SCH 80
Facing: RF (Raised Face)
Bore: According to ASME B16.5 / customer drawing
Heat Treatment: Normalized & Tempered
Certificates: EN 10204 3.1
Quantity: 24 PCS
Packing: Plywood cases with anti-rust oil; marking as per MSS-SP25

ASTM A182 F22 Weld Neck Flange WNRF ASME B16.5 Blind Flange