ASTM A182 F1 Weld Neck Flange – ASME B16.5 WNRF

ASTM A182 F1 Weld Neck Flange is a forged low-alloy steel flange containing approximately 0.5% molybdenum, designed for pressure piping and elevated-temperature service.

F1 has the UNS designation K12822 and is commonly supplied as WNRF (Weld Neck Raised Face) or RTJ flange according to ASME B16.5. Typical applications include refinery, petrochemical, power generation and high-temperature process piping.

Quick Specification

Item	Specification
Product	Weld Neck Flange
Material	ASTM A182 F1
UNS	K12822
Material Type	Carbon-Molybdenum Low-Alloy Steel
Dimensional Standard	ASME B16.5
Size Scope	NPS 1/2–24
Pressure Class	150 / 300 / 400 / 600 / 900 / 1500; Class 2500 up to NPS 12
Facing	RF / RTJ / FF as applicable
Common Type	WNRF / WNRTJ
Bore	To suit specified pipe Schedule
Certification	EN 10204 3.1 when specified
Additional Inspection	PMI, MT, UT, hardness or third-party inspection when specified

What Is ASTM A182 F1?

ASTM A182 F1 is a molybdenum-alloy steel grade for forged piping components such as flanges, fittings and valve parts used in pressure systems.

Unlike Cr-Mo grades such as F11 or F22, F1 does not rely on significant chromium alloying. Its principal alloy addition is molybdenum.

Typical F1 applications require a combination of:

Elevated-temperature strength
Good weldability
Pressure-service capability
Forged component reliability

ASTM A182 F1 vs 16Mo3 / 1.5415

ASTM A182 F1 and European 16Mo3 / 1.5415 are sometimes compared because both are molybdenum-alloy steels used in elevated-temperature pressure applications.

However, they are not directly equivalent grades.

Item	ASTM A182 F1	16Mo3 / 1.5415
Standard System	ASTM	EN
Product Type	Forged piping components	Pressure-purpose steel products
Mo	0.44–0.65%	0.25–0.35%
C	≤ 0.28%	Approx. 0.12–0.20%
Relationship	Technically Comparable	Not Directly Equivalent

For procurement, F1 should not be replaced by 16Mo3 unless the substitution has been technically reviewed and approved by the purchaser or project engineer.

ASTM A182 F1 Chemical Composition

Element	Requirement
Carbon, C	≤ 0.28%
Manganese, Mn	0.60–0.90%
Silicon, Si	0.15–0.35%
Phosphorus, P	≤ 0.045%
Sulfur, S	≤ 0.045%
Molybdenum, Mo	0.44–0.65%

Actual heat chemistry should be verified against the Material Test Certificate (MTC) and the ASTM edition specified in the purchase order.

Mechanical Properties

Typical minimum ASTM A182 F1 requirements include:

Property	Requirement
Tensile Strength	≥ 485 MPa
Yield Strength	≥ 275 MPa
Elongation	≥ 20%
Reduction of Area	≥ 30%
Brinell Hardness	143–192 HBW

ASME B16.5 Weld Neck Flange

ASME B16.5 covers pipe flanges from NPS 1/2 through NPS 24.

For weld neck flanges, the pipe Schedule should normally be stated because the flange bore and welding end must match the connected pipe.

Common facing options include:

WNRF – Weld Neck Raised Face
WNRTJ – Weld Neck Ring Type Joint
Flat Face where applicable

For sizes above NPS 24, large-diameter flanges may fall under ASME B16.47, subject to the required size, Class and design.

Testing and Inspection

Standard material verification should be distinguished from additional project requirements.

Typical verification includes:

Chemical composition
Mechanical properties
Heat-treatment condition
Dimensional inspection
Visual inspection
Material traceability

Additional requirements may include:

PMI
Magnetic Particle Testing – MT
Ultrasonic Testing – UT
Hardness testing
EN 10204 3.1 / 3.2
Third-party inspection

Additional NDT or certification requirements should be clearly stated in the RFQ.

Applications

ASTM A182 F1 Weld Neck Flanges are used in:

Refineries
Petrochemical plants
Power generation
Boiler and steam systems
High-temperature process piping
Pressure piping systems
Industrial process equipment

Final material selection should follow the applicable piping material specification and design conditions.

How to Order ASTM A182 F1 Weld Neck Flange

A complete RFQ should include:

Size + Pressure Class + Facing + Pipe Schedule + Material + Standard + Quantity + Certification

Example:

WELD NECK FLANGE, NPS 8, CLASS 600, RF, SCH 80, ASME B16.5, ASTM A182 F1 / UNS K12822, EN 10204 3.1, QTY: 24 PCS

For project supply, also specify any NDT, hardness, coating, third-party inspection or additional documentation requirements.

Frequently Asked Questions

What is ASTM A182 F1 material?

ASTM A182 F1 is a carbon-molybdenum low-alloy steel forging grade identified by UNS K12822 and used for pressure piping components.

Is ASTM A182 F1 the same as 16Mo3?

No. F1 and 16Mo3 are technically comparable in some elevated-temperature applications but are not directly equivalent grades.

Their chemical compositions and product standards are different.

What is UNS K12822?

K12822 is the UNS designation associated with ASTM A182 Grade F1.

Does an F1 weld neck flange require pipe Schedule?

Yes, the connected pipe Schedule should normally be specified because the weld neck flange bore and welding end must match the pipe wall thickness and bore.

What standard covers ASTM A182 F1 weld neck flange dimensions?

For NPS 1/2–24, the main dimensional flange standard is ASME B16.5.

Large-diameter flanges above NPS 24 may be covered by ASME B16.47, depending on the required design.

ASTM A182 F1 Weld Neck Flange Supplier

We supply ASTM A182 F1 Weld Neck Flanges for refinery, petrochemical, power generation and industrial piping projects.

We work with qualified flange manufacturers and can support project requirements including EN 10204 3.1 certification, PMI, NDT, hardness testing and third-party inspection when specified.

Send us your NPS, pressure Class, facing, pipe Schedule, quantity and project specification for technical review and quotation.

ASTM A182 Grade F1 Weld Neck Flange 16Mo3 WNRF Flange Blind ASME B16.5

Published by ADMIN on