Where to buy high quality Carbon Steel Flanges

What are Carbon Steel Flanges?

Carbon steel flanges, the main materials are carbon steels.
Carbon Steel Flanges are designed with care using current techniques under the visionary guidance of accomplished professionals at manufacturing unit. Offered range is stringently tested on various parameters of quality for ensuring flawlessness and defect free. These products are widely used in various industries and widely appreciated by clients for owning unmatchable characteristics. Offered range supplied in quality assured packaging material.

Carbon steel
  • ASTM A105/A266 Gr.2 (high temperature carbon steel flanges)
  • ASTM A350 LF1 to LF3 (low temperature carbon steel flanges)
  • ASTM A694 Gr. F42/F52/F56/F60/F65 (high yield carbon steel flanges to match API 5L linepipes)


The standards of A694 are more rigorous than the more common SA105N and SA350LF2 grades, providing more robust specifications for high-pressure fluid transmission in oil and gas piping systems. The increased demands on the physical properties of the steel create a stronger metal throughout the pressure range, from low to high temperature services.

ASTM A694 chemical composition - Where to buy high quality Carbon Steel Flanges
ASTM A694 tensile requirements - Where to buy high quality Carbon Steel Flanges

Each grade in the A694 specification is assigned a number correlating to the minimum yield strength (in ksi units) required for that grade; GradeF52 for example requires a minimum Yield Strength of 52 ksi.


This is a mild Carbon Steel that is not only one of the most common of the Carbon steels, but also one of the most common steels in the world. It is hard, not brittle or ductile, and has a low price point. SA105N is very common throughout many industries, and is even used with stainless Steel piping systems with the aid oflap joint End Rings

We stock large diameter (18” – 42”) SLIP-ON, Lap Joint, Weld Neck, and Blind Flanges in SA105N, in class 150 and 300, and can also source a variety of sizes and classes for longer lead times, from 12” to 60”.

Carbon Steel Flanges – Pressure and Temperature Ratings – Group 1.1

Maximum temperature and pressure ratings of flanges conforming dimensions ASME B16.5 and materials specification ASTM A-105

Gage Pressure (psi) 


Flange Class
150 300 400 600 900 1500 2500
< 100 285 740 985 1480 2220 3705 6170
200 260 680 905 1360 2035 3395 5655
300 230 655 870 1310 1965 3270 5450
400 200 635 845 1265 1900 3170 5280
500 170 605 805 1205 1810 3015 5025
600 140 570 755 1135 1705 2840 4730
650 125 550 730 1100 1650 2745 4575
700 110 530 710 1060 1590 2655 4425
750 95 505 675 1015 1520 2535 4230
800 80 410 550 825 1235 2055 3430
850 65 320 425 640 955 1595 2655
900 50 230 305 460 690 1150 1915
950 35 135 185 275 410 685 1145
1000 20 85 115 170 255 430 715
Hydrostatic Test Pressure 
450 1125 1500 2225 3350 5575 9275

The values are for materials Group 1.1

  • Pressure ratings Group 1.2 materials
  • 1 psi (lb/in2) = 144 psf (lbf/ft2) = 6,894.8 Pa (N/m2) = 6.895×10-3 N/mm2 = 6.895×10-2 bar
  • tC = 5/9 (tF – 32)
SA350 LF2

This is a grade of Carbon Steel intended primarily for low-temperature service and requires notch toughness testing. Very similar to SA105N, this material is used in more industrial applications such as the oil and gas industries.

Chemical composition
C 0.3
Mn 0.6~1.35
P 0.035
S 0.04
Si 0.15~0.3
Ni 0.40
Mo 0.12
Cr 0.30
V 0.08
Mechanical properties
Tensile Strength, ksi [MPa] 70-95 [485-655]
Yield Strength, Min., ksi [MPa] 36 [250]
Elongation – 2 in. [50mm] / 4D, Min., % 30 / 22
Reduction of Area, Min., % 40.00
Brinell Hardness, max 187

Yaang can supply large diameter Flanges of all types in SA350LF2, from 18” to 60”, in a wide variety of pressure classes.

The A350 LF2 Line is often referred to as Carbon Steel Low Temp Fittings or Flanges

We carry a large inventory of Carbon Steel Flanges in many types and sizes.

Grades of Carbon steel flanges:

We shall be pleased to develop Non-Standard

  • ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2
  • ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70
Carbon Steel Forged Flanges

A flange is defined as a plate type device, normally round, that is attached to the end of a pipe, fitting, valve or other object to facilitate the assembly and disassembly of a piping system.

Flanges are manufactured in all the different materials to match the material of the pipe and fittings to which they are being attached. While some flanges are made of Cast Iron, the vast majority of flanges are forged carbon steel.

Forged steel flanges are made in seven primary ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 & Class 2500.

Chemical Composition of ASTM A694

ASTM A694 Standard covers carbon and alloy steel forgings for pipe flanges, fittings, valves, and parts for high-pressure transmission service.

Grade  C Mn P S Si
ASTM A694 F42 0.26-0.265 1.60-1.64 0.025-0.030 0.025-0.030 0.15-0.35
ASTM A694 F52 0.26-0.265 1.60-1.64 0.025-0.030 0.025-0.030 0.15-0.35
ASTM A694 F60 0.26-0.265 1.60-1.64 0.025-0.030 0.025-0.030 0.15-0.35
ASTM A694 F65 0.26-0.265 1.60-1.64 0.025-0.030 0.025-0.030 0.15-0.35
Tensile Requirements

Combining values from the two systems may result in nonconformance with the standard.

Grade Yield Strength (0.2 % Offset), min, ksi [MPa] Tensile Strength
min, ksi [MPa]
Elongation in 2 in. or 50 mm, min %
F42 42 [290] 60 [415] 20
F46 46 [315] 60 [415] 20
F48 48 [330] 62 [425] 20
F50 50 [345] 64 [440] 20
F52 52 [360] 66 [455] 20
F56 56 [385] 68 [470] 20
F60 60 [415] 75 [515] 20
F65 65 [450] 77 [530] 20
F70 70 [485] 82 [565] 18

Types of Carbon Steel Flanges

Carbon Steel Flanges are corrosion resistant and have a wide variety of uses. We carry variety of threaded flanges, weld neck flanges and slip on flanges and of course we can can custom build Carbon Steel Flanges to your specifications.


type of special flanges - Where to buy high quality Carbon Steel Flanges

Except the most used standard flanges, there are still a number of special flanges such as:

Custom Carbon Steel Flanges

Carbon Steel Flanges are corrosion resistant and have a wide variety of uses. We carry a variety of threaded flanges, weld neck flanges and slip- on flanges and, of course, we can can custom build steel flanges to your specifications.

Carbon Steel Flanges Finished

Natural, Nickel Plated, Electro Polished Plated or any coating as per customer specification.
Any kind of special die casting sand gravity die lost wax shell moulding castings and cast parts casting produced to user specifications. We can be more competitive than Chinese castings and cast parts made in China Taiwan Asia Korea as traditional Indian expertise in Brass castings and Brass casting is superior and Indian Carbon Steel foundry / foundries are more competitive than other S.S. Carbon Steel foundries.


Flanges within the same standard can either be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel). These flange tables cover the critical flange dimensions to help identify what standard you have.

20180404111014 19438 - Where to buy high quality Carbon Steel Flanges

Critical flange dimensions help to identify the standard

Pipe Size – Pipe flanges also have a corresponding pipe size, generally according to accepted standards.

Outside Diameter of Flange (OD) – this is measured from outer edge to opposing outer edge.

Pitch Circle Diameter (PCD) – this is a diameter that measures from the center of bolt hole to opposing bolt hole.

Flange Thickness – this measures only the thickness of the attaching outer rim, and does not include the part of the flange that holds the pipe.


Several organizations and associations have published specifications that provide dimensional information as well as pressure specifications at different temperatures.

DIN EN 1092-1

Many countries in the European Union (EU) mainly install flanges to the DIN EN 1092-1 (forged stainless or steel flanges).
This standard is very similar to the ASME flange standard. The EN 1092-1 standard incorporates a threaded flange to IOS7.1 instead of NPT. The different forms of flanges within the EN 1092-1 (European Norm Euro norm) is indicated within the flange name through the type. Different types of flanges have different standards, some are as follow:

Blind Flange Type 5 DIN 2527
Threaded Flange Type 12 DIN 2558, 2565 – 2569
Weld Neck Flange Type 11 DIN 2627 – 2638
Flat Flange Type 1 DIN 2573, 2578
Lapped Flange Type 2, 4 DIN 2641, 2622, 2655, 2656

Source: China Stainless Steel Flange Manufacturer – Yaang Pipe Industry (www.metallicsteel.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at [email protected]

Please notice that you might be interested in the other technical articles we’ve published:






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  • How to get high quality forged flanges



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  • https://www.yaang.com
  • https://www.steeljrv.com

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