Forging ASTM A350 Grade LF2 Class 1 Flanges Since 2012 Charpy Tested At −46°C • NPS ½″–60″ • Class 150–2500 PED 2014/68/EU Compliant, Shipping To 15+ Nations

ASTM A350 LF2 Flanges

ASTM A350 LF2 Flanges Summary

GradeLF2 Class 1 – Low Temperature Carbon Steel
Governing StandardASTM A350 / A350M, ASME SA-350
Size RangeNPS ½″ to 24″ per ASME B16.5
Large DiameterNPS 26″ to 60″ per ASME B16.47 A & B
Pressure Class150, 300, 400, 600, 900, 1500, 2500
Delivery ConditionNormalized, Normalized & Tempered, Q&T
Key Alloying ElementsManganese, Silicon, Residual Nickel
Forms AvailableWeld Neck, Slip On, Blind, Threaded, Lap Joint
Facing TypesRF, FF, RTJ, Tongue & Groove, Male & Female
MTC CertificateEN 10204 3.1 and 3.2
OriginIndian, Mill-Traceable
Delivery TimeEx-Stock: 24–72 Hrs • Forged-To-Order: 3–5 Wks
−46°C Rated
Charpy V-Notch Tested
Impact energy values printed on every LF2 flange certificate
Forged In-House
Ring Rolled & Machined
Open-die forging through final facing under one roof
½″ to 60″
B16.5 & B16.47 Range
Small bore through large diameter Series A and B covered
CRN & PVoC Ready
Export Compliance Desk
Canada, Kenya and South Africa paperwork prepared upfront
Bore To Drawing
Schedule-Matched ID
Weld neck bores cut to your pipe schedule before dispatch
astm a350 lf2 flanges

 

0 · at glance

Mortec At A Glance

Established

Since 2012 • 15+ yrs experience

Manufacturing Units

2 in-house units • Taloja & Mazgaon

Stockyard Area

8,850+ sq.ft • Ready-stock inventory

Certifications

ISO 9001:2015, PED • GST, IEC & MSME

Clientele

100+ clients • India & export markets

Export Reach

15+ countries • Europe, GCC & APAC

Testing Offered

Mechanical, chemical & NDT • MTC EN 10204 3.1 & 3.2

Shipment Documents

Invoice, Packing List • COO, COI, MTC, BL & Lab Report

High Toughness SA 350 Lf2 Cl 1 Flanges Manufacturer in India for Low Temperature Service

Cold-service lines fail at the joint, not the pipe. We forge ASTM A350 LF2 flanges in our shop. Every heat is impact tested at −46°C before dispatch. Weld neck, slip on and blind ship within 72 hours.

Class 150 through 2500 sits ready in stock. NPS ½″ to 24″ covers most project lines. Large diameter B16.47 Series A and B forged to order. Send size, class and facing for same-day pricing.

01 · Specification

ASTM A350 LF2 Flanges Specification

Buy straight from the forging floor – impact test report and original MTC pack travel with every crate.

ASTM A350 LF2 Flanges Specification  

ASME SA 350 LF2 Plate Flange Certifications

  • ISO 9001:2015 Quality System
  • PED 2014/68/EU On Request

ASME SA 350 LF2 Class 1 Flanges Third-Party Inspection

  • TUV, SGS, BV, Lloyd’s Register
  • Client Or Consultant Witness Welcome

LTCS A350 LF2 Threaded Flange Sour Service

  • NACE MR0175 / ISO 15156 On Request
  • Hardness Survey Recorded Per Piece

ASME SA 350 LF2 Plate Flange Surface Protection Options

  • Rust Preventive Oil Or Black Paint
  • Yellow Chromate Or Epoxy Coating

A350 Gr LF2 Class 1 Weld Neck Flange Marking & Traceability

  • Hard Stamped Per MSS SP-25
  • Heat Number Tied To Test Report

ASTM A350 LF2 Slip On Flange Bolting & Gasket Pairing

  • ASTM A320 Gr L7 Studs, A194 Gr 4 / 7 Nuts
  • Spiral Wound Or RTJ Rings Supplied Together
02 · Codes We Follow

A350 LF2 Slip On Flange Manufacturing Standards

Every forging is gauged against these dimensional and material codes before it leaves the inspection bay.

ASTM A350 / A350M
ASME B16.5
ASME B16.47 A & B
ASME B16.36
ASME B16.48
ASME B16.20
MSS SP-44
MSS SP-25

ASTM A350 LF2 Flanges Manufacturer In India - Skip the broker

Your drawing goes straight to our press, not to a broker’s inbox.

Request Quote Now
03 · Product Range

A350 LF2 Flange Types

Nine forged patterns held or produced in house, each machined to the same LF2 heat and test file.

A350 Gr LF2 Class 1 Weld Neck Flange

A350 Gr LF2 Class 1 Weld Neck Flange

Long Tapered Hub • Bore To Schedule
  • First choice on high pressure cold service lines
  • Bore counter-cut to match your pipe wall
ASTM A350 LF2 Slip On Flange

ASTM A350 LF2 Slip On Flange

Double Fillet Weld • Class 150–600
  • Faster alignment where site fit-up time is tight
  • Lower cost per joint on utility headers
A350 Gr LF2 Class 1 Blind Flanges

A350 Gr LF2 Class 1 Blind Flanges

Solid Disc • Drilled On Request
  • Seals vessel nozzles and future tie-in points
  • Centre bored and tapped when a vent is needed
Carbon Steel A350 LF2 Threaded Flange

Carbon Steel A350 LF2 Threaded Flange

NPT Or BSPT • No Site Welding
  • Used where a hot work permit is hard to get
  • Thread gauged before the facing operation
ASME SA 350 LF2 Plate Flange

ASME SA 350 LF2 Plate Flange

Flat Ring Profile • Low Class Duty
  • Economical option for tank and vent connections
  • Cut, bored and drilled to your PCD sketch
ASTM A350 Gr LF2 Class 1 Lap Joint

ASTM A350 Gr LF2 Class 1 Lap Joint

Free Rotating Ring • With Stub End
  • Bolt holes swing into line without cutting pipe
  • Backing ring stays clear of the flowing medium
A350 LF2 Class 1 Orifice Flanges

A350 LF2 Class 1 Orifice Flanges

Tapped Pressure Taps • ASME B16.36
  • Supplied as a paired set with jack screws
  • Tap positions drilled to your metering datasheet
LF2 Class 1 Ring Type Joint Flange

LF2 Class 1 Ring Type Joint Flange

R / RX Groove • Class 900 And Above
  • Metal-to-metal seal for the highest class duty
  • Groove cut and gauged to ASME B16.20
SA350 LF2 Class 1 Spectacle Blind Flanges

SA350 LF2 Class 1 Spectacle Blind Flanges

Figure-8 Plate • ASME B16.48
  • Flip to isolate a line during a turnaround
  • Paddle and spacer sets cut to the same order
04 · Composition

LTCS A350 LF2 Threaded Flange Chemical Composition

Heat analysis limits for A350 Gr Lf2 Cl1 Weld Neck Flange, per ASTM A350 / A350M

Chemical Composition – ASTM A350 Grade LF2 (% by weight)
C0.30 maxCarbon
Mn0.60–1.35Manganese
P0.035 maxPhosphorus
S0.040 maxSulfur
Si0.15–0.30Silicon
Ni0.40 maxNickel
Cr0.30 maxChromium
Mo0.12 maxMolybdenum
Cu0.40 maxCopper
V0.08 maxVanadium
Nb0.02 maxColumbium
  • Residual element cap: the combined Cu, Ni, Cr and Mo content is held to 1.00% maximum, and Cr plus Mo together is held to 0.32% maximum.
05 · Strength Data

SA 350 LF2 Class 1 Weld Neck Flange Mechanical Properties

Room temperature requirements for Grade LF2 Class 1, per ASTM A350 / A350M

Tensile Strength485–655 MPa / 70–95 ksi
Yield Strength (0.2%)250 MPa / 36 ksi min
Elongation In 2″22% min
Reduction Of Area30% min
Charpy V-Notch At −46°C27 J / 20 ft-lbf avg

Class 150 to 600 racked: ASTM A350 LF2 Flanges Supplier In India

We share the Charpy energy values and heat number as soon as the lot clears testing.

Request MTC Sample

Impact Tested A350 Gr LF2 Class 1 Weld Neck and Blind Flanges in RF, FF & RTJ Faces At Fair Price, Refer Equivalent

06 · Cross-Reference

SA350 LF2 Class 1 Blind Flanges Material Equivalent

USAASTM / ASME (USA)

  • ASTM A350 / A350M Grade LF2 Class 1
  • ASME SA-350 Grade LF2 Class 1
  • UNS K03011

GermanyEN / DIN (Germany)

  • EN 10222-4 – P285QH (1.0478)
  • DIN 17102 – TStE 355 (1.0566)
  • Cross-reference only, not a drop-in swap

United KingdomBS (United Kingdom)

  • BS 1503 – 221-490 LT50 forging grade
  • Now superseded by the EN 10222 series
  • UK line specs still call out ASTM A350 LF2

JapanJIS (Japan)

  • JIS G3205 – SFL2 low temperature forging
  • SFL1 and SFL3 sit either side on toughness
  • Closest national match on test temperature

ChinaGB (China)

  • NB/T 47008 – 16Mn forging grade
  • Chinese mills quote against ASTM directly
  • Confirm impact temperature before accepting

IndiaIS / ISO (India & International)

  • No dedicated IS or ISO grade number published
  • Indian projects procure to ASTM A350 LF2 direct
  • Our MTC cites the governing ASTM edition

Where buyers usually get stuck is the A350 LF2 versus A105 question – the two look interchangeable on a datasheet until the temperature column is read.

ASTM A350 LF2 Class 1

  • Charpy V-notch test at −46°C is mandatory
  • Written into LPG, ethylene and cold-climate specs
  • Impact values recorded on the mill certificate
  • Tighter carbon ceiling at 0.30% maximum

ASTM A105

  • No mandatory notch toughness requirement
  • General ambient and hot service flange forging
  • Certificate carries no impact energy column
  • Usually the cheaper, faster-moving stock item
06B · Class Selection

ASTM A350 LF2 Class 1 vs Class 2

Same steel, same strength numbers – the class you specify only changes how cold the impact test goes.

LF2 Class 1

  • Charpy V-notch tested at −46°C (−50°F)
  • Default class stocked and quoted on this page
  • Called for on LNG, LPG and Arctic-grade specs
  • Same chemistry and tensile/yield figures as Class 2

LF2 Class 2

  • Charpy V-notch tested at the milder 0°F (−18°C)
  • Suits sites with a less severe minimum design metal temperature
  • Forged to order once the class is confirmed on your PO
  • Same forging, facing and MTC process as Class 1
07 · Size & Class

A350 LF2 Flange Size, Class & Dimension Range

Two codes cover the range – B16.5 up to 24″, B16.47 above it. Tell us which your line list calls out.

Fastest Moving Sizes 2″ 150# 3″ 300# 4″ 150# 6″ 300# 8″ 600# 12″ 150# 16″ 300#

Dimensional Coverage

ASME B16.5NPS ½″ to 24″
ASME B16.47 Series ANPS 26″ to 60″
ASME B16.47 Series BNPS 26″ to 60″
ASME B16.36 OrificeNPS 1″ to 24″
ASME B16.48 Line BlanksNPS ½″ to 24″
Bore MachiningCut to your pipe schedule

Pressure Class Availability

Class 150B16.5 & B16.47 Class 300B16.5 & B16.47 Class 400B16.5 & B16.47 Class 600B16.5 & B16.47 Class 900B16.5 & B16.47 Class 1500B16.5 Class 2500B16.5
08 · Toughness

ASME SA 350 LF2 Class 1 Flanges Impact Testing At −46°C

One test sets LF2 apart. Here is how a lot clears it.

1

Heat Lot Identified

Coupons from your heat. Heat number stamped.

2

Specimens Notched

Three Charpy V-notch coupons. Full size preferred.

3

Chilled To −46°C

Soaked to −46°C. That is −50°F.

4

Energy Logged On MTC

Values printed on your EN 10204 certificate.

ASTM A350 LF2 Flanges Exporter In India To Rotterdam, Netherlands

Full container or part load, sailing out of Nhava Sheva with papers cleared in advance.

Request Export Quote
09 · Facing

A350 LF2 Flange Face Types – RF, FF & RTJ

The face picks the gasket. The gasket holds the joint.

Raised Face (RF)

  • Default from Class 150 to 2500
  • Serrated 125–250 µin AARH

Flat Face (FF)

  • Mates cast iron and GRP equipment
  • Full face gasket, no cracked counter flange

Ring Type Joint (RTJ)

  • Groove gauged to ASME B16.20
  • R, RX and BX rings supplied

Tongue & Groove

  • Gasket held in, cannot blow out
  • Large and small profiles machined

Male & Female

  • Matched pairs cut in one setup
  • Controls gasket squeeze precisely

Custom Finish To Datasheet

  • Smooth or spiral serrated AARH
  • Profilometer reading logged per piece
10 · Compliance

A350 LF2 Plate Flange Country Compliance & Export Documents

Canada – CRN Registration

  • Registered by province under CSA B51.
  • TSSA, ABSA, Technical Safety BC.
  • Drawing and test data supplied.

Kenya – KEBS PVoC

  • CoC issued before loading.
  • Inspected at works, not Mombasa.
  • Papers formatted to the application.

South Africa – SANS & NRCS

  • SANS 347 sets the category.
  • ASTM edition stamped on MTC.
  • Documents sent before sailing.

UAE & Wider GCC

  • Witnessed impact testing accepted.
  • SABER for Saudi, SONCAP for Nigeria.
  • Heat numbers matched across papers.

Documents issued as standard with every export consignment:

Mill Test Certificate
Certificate Of Origin
Certificate Of Inspection
Packing List
Commercial Invoice
Bill Of Lading
Third-Party Lab Report
Charpy Impact Report

ASTM A350 LF2 Flanges Supplier In India With NACE MR0175 Certificate

Hardness surveyed pieces packed and tagged so site QC clears them on arrival.

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11 · Industries

ASTM A350 LF2 Flange Applications

ASTM A350 LF2 Flanges Manufacturer in Mumbai Offers Best Quality For Below Industries

LNG & Cryogenic Terminals
LPG Storage & Bottling
Ethylene & Petrochemical Units
Offshore & Subsea Piping
Arctic & Cold Climate Pipelines
Ammonia & Fertiliser Plants
Air Separation Units
Refrigeration & Cold Storage
Quality

A350 LF2 Weld Neck Flange Testing & Certification

Each check available on request and recorded against the heat number on your certificate. In-house laboratory, ISO-certified forging works.

Charpy V-Notch At −46°C
Tensile Test
Hardness Survey
Chemical Analysis
Positive Material Identification
Ultrasonic Testing
Magnetic Particle Inspection
Dye Penetrant Test
Dimensional Inspection
Surface Roughness (AARH) Check
Grain Size Test
Heat Number Traceability
Third-Party Witness Inspection
MTC EN 10204 3.1 / 3.2
Turnaround

ASTM A350 LF2 Flanges Delivery Estimate

A readiness date at order confirmation. The route sets the window.

Ex-Stock Dispatch

Class 150 and 300 common sizes crated in 24 to 72 hours.

Sea Freight

Nhava Sheva and Mundra sailings to GCC, Africa and Europe.

Air Freight

For small sets needed before the shutdown window shuts.

Country-Specific ETA

Send the discharge port or pincode. You get a dated window.

Global Reach

A350 Gr LF2 Class 1 Blind Flanges Global Reach

Ex-stock and forged-to-order dispatch to the GCC, Africa, Europe and the Americas.

Middle East & GCC
UAEDubai, UAE
Saudi ArabiaJubail, KSA
TurkeyTurkey
SingaporeSingapore
MalaysiaMalaysia
ThailandThailand
Africa, Europe & Americas
South AfricaSouth Africa
KenyaKenya
UgandaUganda
CanadaCanada
NetherlandsNetherlands
MexicoMexico
FAQs

ASTM A350 LF2 Flanges Buyer FAQs

What buyers ask us before releasing a purchase order.

What specification covers ASME SA 350 Lf2 Cl 1 Flanges?
  • ASME SA-350 / ASTM A350 Grade LF2 Class 1
  • UNS K03011, low temperature carbon steel
  • Carbon 0.30% max, manganese 0.60–1.35%
  • Normalized, normalized & tempered, or Q&T
  • Charpy V-notch tested at −46°C
Where is an ASTM A350 Lf2 Slip On Flange normally used?
  • Class 150 to 600 utility and header lines
  • Double fillet welded, inside and outside
  • Faster site fit-up, lower cost per joint
  • Not preferred for high-pressure cyclic duty
  • Dimensions per ASME B16.5
What sizes are available in A350 Gr Lf2 Cl 1 Blind Flanges?
  • NPS ½″ to 24″ per ASME B16.5
  • NPS 26″ to 60″ per ASME B16.47 A & B
  • Class 150, 300, 400, 600, 900, 1500, 2500
  • Solid disc, centre bored and tapped on request
  • Seals nozzles and future tie-in points
What are the mechanical properties of a A350 Gr Lf2 Cl1 Weld Neck Flange?
  • A350 Gr Lf2 Cl1 Weld Neck Flange : Tensile 485–655 MPa / 70–95 ksi
  • Yield 0.2% 250 MPa / 36 ksi minimum
  • Elongation 22% minimum in 2 inch
  • Reduction of area 30% minimum
  • Charpy 27 J / 20 ft-lbf average at −46°C
When is a LTCS A350 LF2 Threaded Flange specified?
  • Where a hot work permit is restricted
  • NPT or BSPT threads, no site welding
  • Threads gauged before the facing operation
  • Avoid in cyclic or vibrating cold service
  • Size limit – confirm with governing code
What is an ASME Sa 350 Lf2 Plate Flange suited to?
  • Flat ring profile, no hub
  • Tank and vent connections, low class duty
  • Cut, bored and drilled to your PCD sketch
  • Economical alternative to a forged hub flange
  • Pressure limit – confirm with governing code
How are A350 Lf2 Cl1 Orifice Flanges supplied?
  • Paired set with jack screws
  • Dimensions per ASME B16.36
  • NPS 1″ to 24″ range
  • Tap positions drilled to metering datasheet
  • Same LF2 heat and impact test file
What groove standard applies to a Lf2 Cl1 Ring Type Joint Flange?
  • Groove cut and gauged to ASME B16.20
  • R, RX and BX rings supplied
  • Common from Class 900 upward
  • Metal-to-metal seal, no soft gasket
  • Ring material to your gasket datasheet
Why Buyers Trust Mortec Manufacturing Co?
Notch toughness held at −46°C without alloy premium
Weld neck, blind and orifice blanks stocked rough-machined
Each LF2 flange heat impact tested before facing
Non-standard bores and AARH cut to buyer drawing

Materials


Standard


Products

Certifications & Credentials
Certified to PED 2014/68/EU for the manufacture of forged steel products
Stock, distribute and trade Steel Flanges, Nuts and Bolts, and precision-machined parts in Nickel Alloys, High Temperature Alloys and Super Alloys
Since 2012, exporting Oil and Gas piping items built to NACE MR0175 / ISO 15156 across the Egypt, Tunisia, Netherlands, Azerbaijan, South Africa, Algeria, Saudi Arabia and Morocco
Hold the largest import and stock inventory of bolting accessories, in both ferrous and non-ferrous metals, in India

Authorized Supplier For The Following Companies - Material At Reseller Price For Traders

Associated Companies - ADNOC, SABIC, Saudi Aramco, GASCO, ORPIC, KNPC, QATARGAS

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