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ASTM A350 LF3 Flanges

HomeASTM A350 LF3 Flanges

ASTM A350 LF3 Flanges | LF3 Low Temperature Flanges | ASTM A350 LF3 Forged Steel Flanges | ASTM A350 LF3 Weld Neck & Blind Flanges | ASTM A350 LF3 Slip On & Socket Weld Flanges

Table of Content

What are ASTM A350 LF3 Flanges?

It is for ‘Low Temperature’ that A350  ASTM  LF3 Flanges are manufactured. They are produced as per ASTM A350 specification, specifically Grade LF3. More importantly, they have been engineered with ‘Precision’ for pressure-retaining components.  Usually, they perform exceptionally well in moderate to low-temperature environments.

More importantly, at Jay Steel Corporation, a leading  ASTM A350 LF3 Flanges Manufacturer in India  we offer you Premium Quality  A350 LF3 Flanges at affordable ASTM A350 LF3 Flanges Price in India

ASTM A350 LF3 Flanges Specifications Table

  • Standard : ASTM A350 / ASME SA350
  • Grade : LF3
  • Material Type : Nickel Alloy Low-Temperature Carbon Steel
  • Manufacturing Process : Forged
  • Product Forms : Weld Neck, Slip-On, Blind, Threaded, Socket Weld, Lap Joint
  • Dimensional Standards : ASME B16.5, ASME B16.47 Series A & B
  • Size Range : NPS ½″ to 24″ (ASME B16.5), Larger sizes as per ASME B16.47
  • Pressure Class : 150, 300, 400, 600, 900, 1500, 2500
  • Flange Facing : RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint)
  • Heat Treatment : Normalized, Normalized & Tempered, Quenched & Tempered
  • Service Application : Low-temperature and cryogenic services
  • Impact Testing : Mandatory as per Class 1 / Class 2
  • Certification : EN 10204 3.1 / 3.2

Chemical Features of ASTM A350 LF3 Flanges

Element Composition (% Max)
Carbon (C) 0.20
Manganese (Mn) 0.40 – 1.05
Phosphorus (P) 0.035
Sulfur (S) 0.040
Silicon (Si) 0.15 – 0.35
Nickel (Ni) 3.3 – 3.7
Chromium (Cr) 0.30
Molybdenum (Mo) 0.12
Copper (Cu) 0.40
Iron (Fe) Balance

Mechanical Properties of ASTM A350 LF3 Flanges

Property Requirement
Tensile Strength 450 – 620 MPa
Yield Strength (0.2% Offset) ≥ 240 MPa
Elongation ≥ 22%
Reduction of Area ≥ 35%
Impact Test Temperature –101°C (–150°F)
Charpy V-Notch Impact Energy ≥ 20 J (minimum)
Hardness ≤ 187 HB

Types of A350 LF3 Flanges

There are several types of A350 LF3 Flanges and they are given below:

ASTM A350 LF3 Cl.2 Socket Weld Flange
ASTM A350 GR LF3 SORF Flanges
ASTM A350 GR LF3 WNRF Flange
SA350 LF3 BLRF Flanges
ASTM A350 Grade Lf3 Slip On Flange
ASTM A350 Grade LF3 Flange

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Equivalent Grades of ASTM A350 LF3 Flanges

Standard / Country Equivalent Grade
ASTM / ASME A350 / SA 350 Grade LF3
EN (Europe) P245GH
DIN (Germany) 1.0566
BS (British) BS 1503-660-490
JIS (Japan) SF490A
ISO P245GH

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Industrial Applications of ASTM A350 LF3 Flanges

It is because of the toughness exhibited by  LF3 Flanges ASTM A350 that they are used in a wide range of industries as applications. They are given below: 

Application Industries
  • Petrochemical Industry
  • Oil & Gas Indstry
  • Cryogenic & Low-Temperature Applications
  • Power Generation Industry
  • Marine & Offshore Engineering
  • Water Treatment & Industrial Utilities
  • Chemical Processing Industry

Why Choose Jay Steel Corporation ?

There are several reasons why you need to choose  Jay Steel Corporation when you look to buy  ASTM A350 LF3 Flanges and other products. They are as given below: 

  • Provision of Comprehensive Product Range & Expertise
  • Following Quality Assurance & Standards Compliance
  • Strong Manufacturing Capability
  • Offering Customized Solutions at competitive pricing

FAQs

What is ASTM A350 LF3 Carbon Steel Flange used for?

Typically, ASTM A350 LF3 Flanges are mainly used in low-temperature pressure service applications. Specifically, for those requiring high strength, toughness, and impact resistance.

What types of ASTM A350 LF3 Flanges are available?

 There are several types of ASTM A350 LF3 Flanges available. They are given below: 

  •   Slip-On Flanges 
  • Blind Flanges
  • Socket Weld Flanges
  • Threaded Flanges
  • Lap Joint (Loose) Flanges 
  • Long Weld Neck Flanges
  • Spectacle Blind Flanges
  • Reducing Flanges
  • Orifice Flanges 
  • Ring Type Joint (RTJ), Tongue & Groove (T&G), Male/Female Facings 

How is ASTM A350 LF3 different from ASTM A350 LF2 flanges?

The differences between ASTM A350 LF3  and ASTM A350 LF2 flanges are given in the table below:

Feature A350 LF2 A350 LF3
Type / purpose Low-temperature carbon/low-alloy steel for forgings (general low-temp service). Low-temperature nickel alloy steel for more severe cryogenic service.
Carbon (max) 0.30 wt% (typical). 0.20 wt% (lower C for improved toughness).
Nickel (Ni) Trace → up to ~0.40 wt% (not a nickel alloy). 3.3–3.7 wt% Ni (primary differentiator).
Manganese (Mn) ~0.60–1.35 wt%. ~0.90 wt% (typical upper range lower than LF2’s top end).
Other notable elements Si ~0.15–0.30; Cr, Mo, Cu very low/trace. Small Cr (≤0.30), Mo ≤0.12, Cu ≤0.40; may include Nb, V trace.
Notch-toughness / low-temperature rating Specified for low-temperature impact testing (commonly Charpy at −46°C / −50°C class requirements depending on class). Suitable for general low-temp service. Rated for much lower temperatures (commonly cited to −101°C / −150°F in practice) — used where superior cryogenic toughness is required.
Mechanical properties (typical) Similar tensile/yield ranges required by A350 for LF grades — manufacturers publish specific tensile & yield; LF2 commonly used in Class 1/2 forgings. Comparable tensile / yield ranges but with tighter control on composition and toughness because of Ni content. (See vendor spec tables for exact numbers.)
Heat treatment / classes Available in Class 1 / Class 2 (A350 classes). Heat treatments: normalized, quenched & tempered, or precipitation heat treatment per ASTM A350. Same classes/heat-treatment options, but material chemistry (Ni) targets higher low-temp toughness.
Weldability Good weldability (low C, standard practices). Good weldability but welding procedure should account for alloying (Ni) — standard procedures suffice for typical flange fabrication.
Typical applications Low-temperature piping, valves, fittings, flanges for oil & gas, power, process plants where temperatures are low but not extreme cryogenic. Cryogenic service, very low-temperature systems, pipelines or equipment requiring enhanced notch toughness at very low temps.
Common equivalents / notes Often used as the low-temperature alternative to A105/WCB where Charpy testing required. Chosen over LF2 when service temperature or toughness demands exceed LF2 capability; sometimes specified by temperature limit (e.g., ≤ −101°C).

What are the pressure ratings and sizes available for A350 LF3 Flanges?

The details of the pressure ratings and sizes for ASTM A350 LF3 Flanges are available in the table below:

Flange Standard Pressure Class / Rating Nominal Pipe Size (NPS) Range
ASME B16.5 Class 150 ½” – 24″
  Class 300 ½” – 24″
  Class 400 ½” – 24″
  Class 600 ½” – 24″
  Class 900 ½” – 24″
  Class 1500 ½” – 24″
  Class 2500 ½” – 24″
ASME B16.47 Series A Class 150 26″ – 60″
  Class 300 26″ – 60″
  Class 400 26″ – 60″
  Class 600 26″ – 60″
  Class 900 26″ – 60″
ASME B16.47 Series B Class 75 26″ – 60″
  Class 150 26″ – 60″
  Class 300 26″ – 60″
  Class 400 26″ – 60″
  Class 600 26″ – 60″
JIS / PN (Optional) JIS 5K, 10K, 16K, 20K, 30K, 40K, 63K DN 15 – DN 1500

How can I verify the quality and certification of ASTM A350 LF3 Flanges?

There are several stages that are involved in the quality and certification of A350 LF3 Flanges  ASTM. They are given below: 

  • Check the Mill Test Certificate (MTC) / Material Certificate
  • Verify Physical and Chemical Test Reports
  • Confirm Heat Number Traceability
  • Inspect Manufacturer’s Quality System
  • Look for Third-Party Inspection (TPI)
  • Physical Inspection Upon Delivery
  • Supplier Reputation and Documentation
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