ASTM A350 LF2 Flanges | SA 350 Gr LF2 Class 1 Weld Neck / LTCS Flange

What are the key specifications of ASTM A350 LF2 flanges for buyers?

The ASTM A350 LF2 specification is for low temperature applications including cryogenic and refrigeration systems. The ASTM A350 LF2 flanges manufacturers in India consider the given specification to suffice their application requirements:

The type and facing of the flange
Size and pressure rating
Standard and material grade
Heat treatment and surface finish
Testing, inspection and documentation

Can you explain the difference between Class 1 and Class 2 in LF2 flanges?

The difference between Class 1 and Class 2 in LF2 flanges is in their notch toughness which is required for specific low temperature applications.

Class 1 has lower notch toughness requirements than class 2 SA 350 lf2 material.
CL 1 requires Charpy-V notch impact testing at a min of -46 °C, whereas for class 2, it is -101 °C.
Class 2 ASME SA350 gr lf2 plate flange is used for lower temperature applications compared to class 1.

Manufacturer Of SA 350 Gr LF2 Class 2 Weld Neck Flange in India, View Specification

ASTM A350 LF2 Material Specification

Common Size :

DN15 – DN1500
PN 2.5 – PN 400
NPS: ½” to 48″

Melting Point :

1480°C

Benefits :

Low maintenance
Easy to use
Toughness

Common Thickness :

SCH 10/ 20/ 40
SCH 60/ 80/ 100
SCH 120/ 140
SCH 160/ 180

Pressure :

Class 125, 150
Class 300, 400
Class 600, 900
Class 1500, 2500

American Standard :

ASME B16.5
ASME B16.36
ASME B16.48
ASME B16.47

Supporting Material :

Bolts
Ring Joint
Gaskets
Nuts

Threads :

BSPP (Male & female)
MNPT (Male)
MPT/ BSPT (Female)
NPT/ BSP/ FPT

Surface Finish :

Smooth finish
Concentric serrated
Cold water finish
Spiral serrated

Manufacturing Technique :

Cast
Plate
Forged

Certificate :

100% Radiography Test
NACE MR0175
Third Party Inspection
MTC BS EN 10204 3.1/ 3.2

No. Of Bolts Hole :

4 To 48

Faces Method :

M&F face (Male & female)
RF face (Raised)
RTJ face (Ring type joint)
FF face (Plain or flat)
T&G face (Tongue & groove)

Installations :

Sea water exchanger
Petrochemical plants
Nuclear energy sector

Coating Types

Oil Varnished
FBE Coating
Epoxy Coated

Types Of Packaging :

Carton box
Plastic bag
Wooden case
Or custom as required

Logistics Way :

By Air
By Sea
Saudi Arabia = 7 to 8 day
UAE = 6 to 7 day
Oman = 5 to 6 days
Bahrain = 9 to 10 days
Qatar = 7 day

Services :

Drilling/ Electroplating
Threading/ Forging
Beveling end/ Polishing
Cutting/ Minor Fabrication
CNC machined/ Casting
Sand Blasting/ Rolling

Types Of Connection :

Threaded
Welding

Available Material:

Carbon steel
Nickel alloy
Titanium
Copper nickel
Alloy steel
Stainless steel

Testing Methods :

Hardness test
Tensile test
Material inspection
Impact test
Visual inspection
PMI test

Working Temperature :

2200 to 1700°F

Forging Temperature :

1700 to 2200°F

Density :

20g/cm3

Material :

Carbon Steel

For More Information Please Contact US

What is the impact of coating on the price of low temperature carbon steel flanges?

The impact of coating on the price of low temperature carbon steel flanges would depend on the type of coating and its thickness. The cost also varies with the coating quality, the number of flanges to be coated, application method and customization requirements. You can contact a renowned SA 350 lf2 class 1 forged flange manufacturer like Vishal Steel who offers high quality flanges and coatings on them at the most competitive rates.

Supplier of LTCS Flange Material In All Types Such As Sa350 Gr LF2 CL1 Puddle/ Plate Flange Cutted From Sheet, Check Price List

ASTM A380 LF2 Blind Flange Price

Size	Pressure Class	SCH	Price In US$ (Dollar) per unit	Price in UAE Dirham (AED) per unit
2"	150#	SCH 40/STD	US$ 11.96	43.93
2"	600#	SCH 40/STD	US$ 16.82	61.78
36"	150#	SCH 20/XS	US$ 1,749.69	6426.61
10"	150#	SCH 80	US$ 97.64	358.63
18"	150#	SCH XS	US$ 274.48	1008.17
4"	150#	SCH 160	US$ 32.71	120.14
3"	150#	SCH XXS	US$ 23.29	85.54
4"	150#	SCH XXS	US$ 32.70	120.11
4"	150#	SCH 80/XS	US$ 30.60	112.39
36"	150#	SCH 20/XS	US$ 1,748.68	6422.90
1.1/2"	300#	SCH 160	US$ 18.72	68.76
2.1/2"	300#	SCH 40/STD	US$ 18.59	68.28
1/2"	300#	SCH 40/STD	US$ 7.29	26.78
1.1/2"	300#	SCH 40/STD	US$ 14.43	53.00
1.1/2"	150#	SCH 80/XS	US$ 9.52	34.97
1.1/4"	150#	SCH 40/STD	US$ 8.45	31.04

A350 LF2 Class 2 Weld Neck Flange Price

Size	Pressure Class	Price In US$ (Dollar) per unit	Price in UAE Dirham (AED) per unit
4"	300#	US$ 45.08	165.58
10"	300#	US$ 189.11	694.60
1"	600#	US$ 10.46	38.42
1"	150#	US$ 7.69	28.25
10"	150#	US$ 112.99	415.01
12"	300#	US$ 285.00	1046.81
3"	150#	US$ 19.50	71.62

Stockist of Low Temperature Carbon Steel Slip On Flange and A350 LF2 Cl1 Blind Flange in India with UT, MT or PT Non-destructive Testing Or As Required, Refer Suitable Environment & Rating Chart

LTCS Flanges Temperatures Suitable Environment

-46°C

LF2 Flanges Max Service Temperature

500°C

Forging Process Of A350 LF2 Blind Flange

Forged
Rolled
Strand cast blooms
Billets
Slabs
Bars

A350 LF2 Yield Strength

ASTM A350 LF2 Flanges Yield Strength
ksi	36
MPa	250

What is the purpose of pressure rating in an LTCS flange?

The purpose of pressure rating in the LTCS flange is to ensure the safety and integrity of the system. Using a flange that cannot bear the pressure of a given service can lead to failure and accident.
They are established in accordance with the industry standards and codes.
The pressure rating of LTCS flange material also takes into account the temperature effect on the mechanical properties of the material.

Types Of ASTM A350 LF2 Flanges

A350 LF2 CL1 Socket Weld Flanges

Attached Process :
Welding
Brazing
Threading

SA350 LF2 CL1 Plate Flanges

EN Standard :
6Bar/ 10Bar
16Bar/ 25Bar
40Bar

A350 LF2 Carbon Steel Lap Joint Flanges

Facing Finish :
Stock finish
Spiral serrated
Smooth finish

LTCS Reducing Flange

Suitable Gasket :
SOFT gaskets
Hard gaskets
Composite gaskets

A350 LF2 Cl1 Vanstone Flange

Heat treatment :
Normalizing & quenching
Solution Annealing

A350 LF2 Cl1 RTJ Flange

JIS Standard :
5K/ 10K/ 16K
20K/ 30K
40K/ 63K

LF2 Carbon Steel Square Flanges

Testing methods :
Hardness test
Magnetic particle test
Liquid penetrant test

A350 Gr LF2 Cl1 Flat Flanges

Documentation :
Raw material reports
Guarantee letter
Heat treatment chart

SA350 Gr LF2 CL1 Anchor Flange

Application :
Pharmaceuticals
Petrochemicals
Power generation

Low Temperature Carbon Steel Flange Rating Chart

Temperature (F°)	Class 150
-20 to 100	285
200	260
300	230
400	200
500	170
600	140
700	110
800	80
900	50
1000	20

Temperature (F°)	Class 300
-20 to 100	740
200	680
300	655
400	635
500	605
600	570
700	530
800	410
900	230
1000	85

Temperature (F°)	Class 400
-20 to 100	985
200	905
300	870
400	845
500	805
600	755
700	710
800	550
900	305
1000	115

Temperature (F°)	Class 600
-20 to 100	1480
200	1360
300	1310
400	1265
500	1205
600	1135
700	1060
800	825
900	460
1000	170

Temperature (F°)	Class 900
-20 to 100	2220
200	2035
300	1965
400	1900
500	1810
600	1705
700	1590
800	1235
900	690
1000	255

Temperature (F°)	Class 1500
-20 to 100	3705
200	3395
300	3270
400	3170
500	3015
600	2840
700	2655
800	2055
900	1150
1000	430

Temperature (F°)	Class 2500
-20 to 100	6170
200	5655
300	5450
400	5280
500	5025
600	4730
700	4425
800	3430
900	1915
1000	715

A350 Lf2 Flanges Testing Equipment

Manufacturer of LF2 Steel Threaded Flange, SA 350 Gr LF2 Plate Flange Material With Sealing Face In Class 150/ 300/ 600/ 900, Check Chemical Composition & Coating Types

SA 350 Gr LF2 Cl 1 Chemical Composition

Nickel

≤0.40

Chromium

≤0.30

Molybdenum

≤0.12.

Manganese

0.60-1.35

Phosphorus

≤0.35

Copper

≤0.40

Sulphur

≤0.40

Carbon

≤0.30

Silicon

0.15-0.30

Niobium

≤0.02

Vanadium

≤0.08

ASTM A350 LF2 Mechanical Properties

Mechanical Properties
Tensile Strength	70-95 KSI 485–655 MPa
Reduction Of Area	30% min.
Yield Strength	36 KSI 250 MPa
Impact Test Temperature	-45℃
Elongation	30%
CVN at -50℉	20/16 joules

ASTM A350 Gr Lf2 Temperature Range

Working pressure by Class And BAR

TEMP(°C)	150	300	600
-29 TO 38	19.6	51.1	102.1
50	19.2	50.1	100.2
100	17.7	46.6	93.2
150	15.8	45.1	90.2
200	13.8	43.8	87.6
250	12.1	41.9	83.9
300	10.2	39.8	79.6
350	8.4	37.6	75.1
400	6.5	34.7	69.4
450	4.6	23	46
500	2.8	11.8	23.5
538	1.4	5.9	11.8

LTCS Flange Coating

Cold And Hot Dip Galvanized Coating
Epoxy Coating
FBE Coating
Scotch Coating

Oil Black Paint Coating
Zinc Plated Coating
Yellow Transparent Coating
Anti-rust Paint Coating

A350 LF2 Hardness

LF2 Flanges Hardness, (maximum)
HBW	197

Check SA 350 LF2 Socket Weld Flange Weight In EN 1092-1 Type 11 PN10 To PN25, View Melting Point Of ASME SA350 LF2 Class 1 Lap Joint Flange

CS A350 LF2 Flanges Weight

NPS (Inches)	A350 Lf2 Slip On Flanges	ASME SA350 Lf2 Weld Neck Flanges	A350 Lf2 Blind Flanges
1/2	1.8	1.9	1.8
1	3.6	3.7	3.6
1 1/2	5.5	5.9	5.8
2	10.2	10.8	10.1
2 1/2	13.9	15	14
3		19.9	19.1
4		29.9	29.9
5		55.4	58.4
6		68.4	71.8
8		117	122
10		194.0	210.0
12		288.0	316.0
16		485.0	558.0
18		644.0	760.0
24		1232.0	1558.0

A350 Flange Material Tensile Strength

A350 LF2 Class 1 Flanges Tensile Strength (minimum)
ksi	70–95
MPa	485–655

Vishal Steel Is Biggest Forging Factory In India

A350 LF2 CL2 Flanges Gasket

Gaskets Types	Diagram
PTFE Gasket
Oval Ring Gasket
Spiral Wound Gaskets
Metal Jacketed Gasket
RTJ Gaskets
RF Gaskets
FF Gaskets

SA 350 LF2 Flanges Bolts Chart as per Class 300

Size in Inches	Bolts Number	Length Of Machine Bolt
1/2	4	55
3/4	4	65
1	4	65
1 1/4	4	70
2	8	75
3	8	90
4	8	95
5	8	110
6	12	110
8	12	120
10	16	140
12	16	145
16	20	165
20	24	185
24	24	205

Marking On ASTM A350 LF2 Flanges

size
item
specification and number
pressure rating, with unit
OD
WT, with unit
bore when applicable
std schedule when applicable,
material specification

4"
FLANGE
WNRF
ASME B16.5 300#
6" OD x 0.250"
152.4 Unit
Bore 15.500"
SCH 120
ASTM A350 LF2 Class 2

Forging Process Of SA350 LF2 Class 1 Pipe Flange

Matrial Preparing
Matrial Cutting
Heating
Foring
Heat Treatment
Cutting & Shearing
Inspection

A350 Flange Material Melting Point

2740°F

Difference between the tensile and yield strength of the SA 350 Gr LF2 CL1 Weld Neck flange?

Tensile strength is the maximum stress that SA 350 Gr LF2 CL1 Weld Neck flange can withstand when it is stretched, without breaking. The tensile strength can vary within the range of 485-655 MPa.

Yield strength is the amount of stress under which the weld neck flange can undergo permanent deformation. The yield strength of LF2 CL1 material is around 250 MPa.

How do I check the mill test certificate of the A350 lf2 class 2 Blind Flange?

To check the mill test certificate of A350 lf2 class 2 blind flange, you need to confirm its material grade, chemical composition, mechanical properties, heat treatment applied and traceability information.

ASTM A350 LF2 Carbon Steel Flanges Inspection