ASTM A350 Lf2 Flanges

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ASTM A350 Lf2 Flanges Specification

Application
Oil & Gas, Petrochemical, Power Plants, Marine, Chemical Industry

Dimension (L*W*H)
As per ASME/ANSI B16.5, B16.47 or Customized

Purity
99%

Feature
High Strength, Accurate Dimension, Corrosion Resistant

Grade
LF2

Product Type
Industrial Flange

Material
Carbon Steel

Standard
ASTM A350 Lf2

Shape
Round

Surface
Rust Proof Oil Coated

Connection
Welded/Threaded/Bolted

Technics
Forged

Pressure
Class 150 to 2500

Size
1/2 Inch to 48 Inch

Color
Silver / Grey

About ASTM A350 Lf2 Flanges

What Are Specification ASTM A350 Lf2 Flanges?

ASME B16.5 size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Standards	ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flanges.
Standard UNI	6Bar 10Bar 16Bar 25Bar 40Bar
Standard JIS	5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
Standard ANSI	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Standard DIN	6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
Flange supporting material	Gasket, Ring Joint, Flange Bolts

Chemical Composition Of ASTM A350 Lf2 Flanges?

ELEMENT	COMPOSITION, %
Carbon	0.35 max
Manganese	0.60-1.05
Phosphorus	0.035 max
Sulfur	0.040 max
Silicon	0.10-0.35
Copper	0.40 max (1)
Nickel	0.40 max (1)
Chromium	0.30 max (1-2)
Molybdenum	0.12 max (1-2)
Vanadium	0.08 max

Mechanical Properties Of ASTM A350 Lf2 Flanges?

Mechanical Properties	Requirements
Tensile strength,min,psi [MPa]	70000 [485]
Yield strength,min,psi [MPa]	36000 [250]
Elongation, min, %	30
Reductionofarea,min,%	30
Hardness,HB,max	187

Versatile Face Types & Connections

ASTM A350 LF2 flanges offer flexibility with face options like Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ), adaptable to varied piping requirements. Their end connections include butt weld, socket weld, and threaded, ensuring compatibility with diverse installation methods. This adaptability makes them a great fit for rigorous industrial environments.

Manufactured to Strict Standards

Conforming to ASME B16.5, B16.47, and API 6A, LF2 flanges guarantee quality and spec compliance for global applications. Each flange undergoes impact (Charpy V-Notch) testing at -46C, with tensile and yield strengths of 485 MPa and 250 MPa minimum. The use of forged carbon steel ensures high strength and durability in challenging conditions.

Reliable Performance Across Temperatures

With a temperature range of -46C to 345C, these flanges deliver consistent strength and resilience, even in sub-zero environments. Their corrosion-resistant, oil-coated surfaces provide long-lasting reliability. This makes LF2 flanges a preferred choice in industries where temperature fluctuations demand stable mechanical properties.

FAQs of ASTM A350 Lf2 Flanges:

Q: How are ASTM A350 LF2 flanges tested for low-temperature applications?

A: These flanges undergo a Charpy V-Notch impact test at -46C, ensuring they provide reliable toughness and resistance to brittle fracture in low-temperature service environments.

Q: What types of face finishes are available for LF2 flanges and when should each be used?

A: LF2 flanges come in Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ) finishes. RF is ideal for high-pressure environments, FF is used for lower pressure or cast iron equipment, and RTJ is preferred for high-pressure, leak-tight service.

Q: Where can ASTM A350 LF2 flanges be applied?

A: These flanges are commonly used in oil & gas, petrochemical, power plants, marine, and chemical industries where robust mechanical performance and corrosion resistance are essential.

Q: What is the manufacturing process for ASTM A350 LF2 flanges?

A: LF2 flanges are typically produced using forging techniques, followed by precision machining to attain accurate dimensions and meet ASME/ANSI B16.5, B16.47 standards.

Q: How do the strength and hardness specifications benefit LF2 flange users?

A: With a minimum tensile strength of 485 MPa and hardness up to 163 HB, these flanges ensure high durability, safety, and longevity under demanding conditions.

Q: What is the standard packaging for ASTM A350 LF2 flanges?

A: Flanges are usually packed in wooden cases or pallets, but packaging can be customized as per customer requirements to ensure safe transport and storage.

Q: Why are oil-coated surfaces important for LF2 flanges?

A: The rust-proof oil coating protects the carbon steel from corrosion during storage and transit, maintaining the flanges integrity until installation.

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