Carbon Steel Grades Suppliers

Premium Stockist & Exporter of Carbon Steel Pipe Fittings & Flanges – ASTM A234 WPB/WPC, A860 WPHY 42 to 70, A105, A350 LF2, A694 F42 to F70 – Forged SW/Threaded Fittings & WNRF/SORF/BLRF Flanges – ASME B16.5, B16.9, B16.11 – Class 150 to 2500, SCH 10 to XXS – Global Delivery.

Carbon Steel Pipe Fittings and Flanges are widely used in critical piping applications across oil & gas, petrochemical, power generation, and shipbuilding industries. These materials offer excellent mechanical properties, weldability, and cost efficiency. Among the most common grades are ASTM A234 WPB/WPC, which are used for standard pressure piping systems and are available in seamless and welded buttweld fittings such as elbows, tees, reducers, and end caps. These fittings conform to ASME B16.9 and are offered in a wide size range from ½” to 48” NB, with wall thicknesses from SCH 10 to SCH XXS.

High-strength carbon steel grades like ASTM A860 WPHY 42, 46, 52, 60, 65, and 70 are used in high-pressure applications and pipelines requiring superior yield strength. These grades are supplied in both buttweld and forged formats. Buttweld fittings are manufactured as per MSS SP-75, while forged fittings such as socket weld and threaded types comply with ASME B16.11 and BS 3799 standards. The fittings include elbows, tees, couplings, unions, plugs, and swages, available in pressure classes 2000#, 3000#, 6000#, and 9000#.

Carbon Steel Flanges are manufactured using grades like ASTM A105 for ambient temperature applications and ASTM A350 LF2 for low-temperature services. These flanges comply with ASME/ANSI B16.5, B16.47, and EN 1092-1 and are available in types such as Weld Neck (WNRF), Slip-On (SORF), Blind (BLRF), Socket Weld, Threaded, and Lap Joint Flanges. Flanges are offered in class ratings from 150# up to 2500# and are available with Raised Face (RF), Flat Face (FF), or Ring Type Joint (RTJ) sealing faces.

ASTM A694 F42, F46, F52, F60, F65, and F70 are high-yield carbon steel grades designed for high-pressure pipeline flanges and components. These grades are often used for the fabrication of forged flanges and outlet fittings (Olets) such as Weldolets, Sockolets, Threadolets, and Nipolets, manufactured to MSS SP-97 standards. These outlet fittings support strong and leak-proof branch connections in piping systems ranging from ½” to 36” NB. Our carbon steel fittings and flanges are tested per EN 10204 3.1/3.2 with full traceability and comply with international specifications including NACE MR0175 and ISO 9001:2015.

ISO Certified Supplier of Carbon Steel Fittings & Flanges – ASME B16.11 – Socket Weld & Threaded Elbows, Tees, Caps, Unions, Couplings – ANSI B16.5 Flanges: WNRF, SORF, Blind, Threaded, SWRF, RTJ – Full Range up to 48”, Buttweld Components: Buttweld Elbows, Tees, Reducers, Caps, Stub Ends – Compliant with ASME B16.9 & MSS SP-75 – Sizes from ½” to 48”, SCH 10 to XXS – ISO Approved.

Industrial Carbon Steel Specifications

Material Grade ASTM A234 WPB/WPC, ASTM A860 WPHY 42/46/52/60/65/70, ASTM A105, ASTM A350 LF2, ASTM A694 F42/F46/F52/F60/F65/F70
Available Product Types Buttweld Fittings (Elbows, Tees, Reducers, Caps, Stub Ends), Flanges (WNRF, SORF, BLRF, SWRF, RTJ, Threaded, Lap Joint), Forged Fittings (Socket Weld & Threaded), Olets (Weldolet, Sockolet, Threadolet, etc.)
Buttweld Size Range ½” NB to 24” NB (Seamless), ½” NB to 48” NB (Welded)
Flanges Size Range ½” NB to 24” NB
Forged Fittings Size ½” NB to 4” NB (Socket Weld & Threaded)
Wall Thickness SCH 10, SCH 20, SCH 40, SCH 80, SCH 120, SCH 160, XXS
Standard Specifications ASTM A234 / ASME SA234, ASTM A105 / SA105, ASTM A860 / SA860, ASTM A350 / SA350, ASTM A694 / SA694, ANSI B36.10, B36.19
Manufacturing Standards ASME B16.9, ASME B16.5, ASME B16.11, MSS SP-75, MSS SP-97, EN 10253, DIN 2605/2615/2616, ISO 3419, JIS B2312
Types 90° Elbow (LR/SR), 45° Elbow, Equal Tee, Reducing Tee, Concentric Reducer, Eccentric Reducer, End Cap, Stub End, WNRF, SORF, Blind Flange, SWRF, RTJ, Socket Weld Elbow, Tee, Coupling, Union, Plug, Weldolet, Sockolet, Threadolet
Form Seamless, Welded, Fabricated
Heat Treatment Normalized, Tempered, Quenched & Tempered (as per grade)
Mechanical Properties Tensile Strength: 415–690 MPa (varies by grade)
Yield Strength: 205–485 MPa (varies by grade)
Elongation: ≥20%
Pressure Ratings Class 150 to 2500 / 3000# to 9000# for Forged Fittings / As per ASME B16.5, B16.11 & B16.9
Testing & Certifications EN 10204 3.1 & 3.2, NACE MR0175, IBR Approved, PMI, UT, Hydro Test, Radiography, MPT
Surface Finish Black Coated, Anti-Rust Coated, Sand Blasted, Pickled
End Connection Types Beveled Ends (BE), Plain Ends (PE), Socket Weld, Threaded (NPT/BSP), Flanged
Manufacturing Capabilities Hot Forming, Cold Forming, Induction Heating, CNC Beveling, Custom Fabrication
Raw Material Sources India, Japan, South Korea, USA, Germany, Italy
Export Destinations USA, UAE, Saudi Arabia, Qatar, Oman, Kuwait, Egypt, South Africa, Nigeria, Indonesia, Malaysia, Singapore, Europe

Industrial Carbon Steel Standards

ANSI/ASME B16.47 FlangesANSI/ASME B16.36 FlangesANSI/ASME B16.5 FlangesPr. EN1902-1 Flanges
DIN FlangesJIS FlangesBS 4504 FlangesBS 10 Flanges
MSS SP-44 FlangesJIS B2220 FlangesKS B1503 FlangesUNI Flanges
SABS/SANS 1123 FlangesAS 2129, AS 4087 FlangesISO 9624, ISO 7005-1 FlangesAWWA Flanges Standard
GOST Standard FlangesAPI FlangesAS/ANZ 4331.1 FlangesSeries A Flange
Series B FlangeSAE J518 FlangesGB FlangeNorwegian Standard Flanges
ASME B16.11 – Forged Steel Fittings, Socket-Welding and ThreadedBS 3799 – Screwed and Socket-Welding for the Petroleum IndustryMSS SP-79 – Socket-Welding Reducer InsertsMSS SP-83 – Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
MSS SP-95 – Swage(d) Nipples and Bull PlugsMSS SP-97 – Integrally Reinforced Forged Branch Outlet FittingsDIN 2986 – Threaded FittingsDIN 2999 – Pipe Threads for Fittings (British Standard Pipe Threads)
ISO 49 – Malleable Iron Fittings, ThreadedISO 7/1 – Pipe Threads Where Pressure-tight Joints Are Made on the ThreadsEN 10241 – Steel Threaded Pipe FittingsJIS B2316 – Japanese standard for forged pipe fittings.
ANSI/ASME B16.9 – Factory-Made Wrought Steel Buttwelding FittingsANSI/ASME B16.28 – Wrought Steel Short Radius Elbows and ReturnsANSI/ASME B16.25 – Buttwelding Ends(beval standards)MSS SP-43 – Wrought and fabricated Butt welding Fittings for Light Wall Applications
MSS SP-75 – High Test Wrought Butt welding FittingsDIN 2616 – Butt welding Pipe Fittings: ReducersDIN 2617 – Butt welding Pipe Fittings: CapsDIN28011 – Dished Ends(used in pressure vessels)
EN10253-1 Butt-welding Pipe Fittings(Non Alloy Steels)EN10253-2 Butt-welding Pipe Fittings(Stainless/Alloy Steels)  

Carbon Steel International Standards

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
ASTM A234 WPB 1.0457 K03006 STPG 370 3601 430 20 E24-2 P235TR2 / P265GH
ASTM A234 WPC 1.0501 K03504 STPG 410 3601 430 20 E28-2 P265GH / P280GH
STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
WPHY 42 K31242 4360 43A 10G2 E24-2 S275JR
WPHY 46 K12446 4360 43C 10G2S E28-2 S275J2G3
WPHY 52 K12822 4360 50C 10G2F E36-2 S355J2G3
WPHY 60 K03014 4360 55C 15GS E42-2 P355N
WPHY 65 K03015 4360 60C 16GS E460 P460N
WPHY 70 K03016 4360 65C 17G1S E52-3 P460NL1

Carbon Steel Chemical Composition

Grade C (%) Mn (%) Si (%) P (%) S (%) Cr (%) Mo (%) Ni (%) V / Others
ASTM A234 WPB 0.30 max 0.50–1.20 0.10 min 0.035 max 0.040 max 0.40 max 0.15 max 0.40 max
ASTM A234 WPC 0.35 max 0.50–1.35 0.10 min 0.035 max 0.040 max 0.40 max 0.15 max 0.40 max
ASTM A860 WPHY 42–70 0.26 max 1.15 max 0.50 max 0.030 max 0.030 max 0.50 max 0.50 max 0.50 max V: 0.06 max
ASTM A105 0.35 max 0.60–1.05 0.10–0.35 0.035 max 0.040 max 0.30 max 0.12 max 0.40 max
ASTM A350 LF2 0.30 max 0.60–1.35 0.15–0.30 0.035 max 0.040 max 0.30 max 0.12 max 0.40 max
ASTM A694 F42–F70 0.26 max 1.00–1.35 0.15–0.35 0.025 max 0.025 max 0.30 max 0.12 max 0.50 max

Carbon Steel Flanges Mechanical Properties

Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HBW) Impact Test (Charpy V-notch)
ASTM A234 WPB 415–585 ≥240 ≥22 ≤197 Not required
ASTM A234 WPC 485–655 ≥275 ≥22 ≤197 Not required
ASTM A860 WPHY 42 ≥455 ≥290 ≥20 ≤235 As per client requirement
ASTM A860 WPHY 46 ≥485 ≥315 ≥20 ≤235 As per client requirement
ASTM A860 WPHY 52 ≥565 ≥360 ≥20 ≤235 As per client requirement
ASTM A860 WPHY 60 ≥655 ≥415 ≥20 ≤235 As per client requirement
ASTM A860 WPHY 65 ≥690 ≥450 ≥20 ≤235 As per client requirement
ASTM A860 WPHY 70 ≥760 ≥485 ≥20 ≤235 As per client requirement
ASTM A105 485–655 ≥250 ≥22 ≤187 Not required
ASTM A350 LF2 485–655 ≥250 ≥22 ≤197 Min. 20 ft-lbf at -46°C
ASTM A694 F42 ≥455 ≥290 ≥20 ≤235 As per service spec
ASTM A694 F46 ≥485 ≥315 ≥20 ≤235 As per service spec
ASTM A694 F52 ≥565 ≥360 ≥20 ≤235 As per service spec
ASTM A694 F60 ≥655 ≥415 ≥20 ≤235 As per service spec
ASTM A694 F65 ≥690 ≥450 ≥20 ≤235 As per service spec
ASTM A694 F70 ≥760 ≥485 ≥20 ≤235 As per service spec

Carbon Steel Types

Flange

RF, FF

Buttweld Fittings

Seamless, Welded

Forged Fittings

Socket weld, Threaded

Olets / Outlets

Weldolet, Sockolet

Carbon Steel Industries & Applications

Mining and Mineral Processing
Fire Safety and Suppression Systems
HVAC, Plumbing, and Mechanical Piping
Water Treatment and Distribution Networks
Nuclear Energy and Power Generation
Heat Exchangers and Thermal Systems
Oil, Gas, and Petrochemical Industries
Food Processing, Manufacturing, and Pharmaceutical Equipment

ASTM A105 Carbon Steel Flange Weight Chart

Size OD WT SR 90 Deg Elbows Centre – Face A Weight LR 90 Deg Elbows Centre – Face A Weight SR 45 Deg Elbows Centre – Face B Weight
mm inch. mm mm SCH mm kg mm kg mm kg
500 20″ 508 9.52 STD 508 93.5 762 140 318 85
12.7 X.S 508 124 762 186 318 112.5
450 18″ 457 9.52 STD 457 75.6 686 113 286 56.5
12.7 X.S 457 100 686 150 286 75
400 16″ 406.4 9.52 STD 406 59.5 610 89.3 254 45
12.7 X.S 406 78.7 610 118 254 59
350 14″ 355.6 9.52 STD 356 45.4 533 68.1 222 34.1
12.7 X.S 356 60 533 90 222 45
300 12″ 323.9 9.52 STD 305 35.4 457 53.1 190 26.6
12.7 X.S 305 46.7 457 70 190 35
250 10″ 273.9 9.27 STD 254 24.1 381 36.1 159 18.1
12.7 X.S 254 32.5 381 48.8 159 24.4
200 8″ 219.1 8.18 STD 203 13.6 305 20.4 127 10.2
12.7 X.S 203 20.9 305 30.9 127 15.5
150 6″ 168.3 7.11 STD 152.4 6.8 229 10.1 95.2 5.1
10.97 X.S 152.4 10.2 229 15.3 95.2 7.7
125 5″ 141.3 6.65 STD 127 4.8 190 6.8 79.4 3.4
9.5 X.S 127 6.5 190 10 79.4 5
100 4″ 114.3 62 STD 101.6 2.8 152.4 4.2 63.5 2.1
8.56 X.S 101.6 3.9 152.4 5.7 63.5 2.9
80 3″ 88.9 5.49 STD 76.2 1.45 114.3 2.18 50.8 1.1
7.62 X.S 76.2 1.95 114.3 2.86 50.8 1.45
65 21/2″ 73 5.16 STD 63.5 0.95 95.2 1.46 44.4 0.73
71 X.S 63.5 1.27 95.2 1.82 44.4 0.91
50 2″ 60.3 3.91 STD 50.8 0.5 76.2 0.72 34.9 0.36
5.54 X.S 50.8 0.68 76.2 1 34.9 0.5
40 11/2″ 48.3 3.68 STD 38.1 0.26 57.1 0.4 28.6 0.2
58 X.S 38.1 0.35 57.1 0.5 28.6 0.25
32 11/4″ 42.2 3.56 STD 31.75 0.18 47.6 0.28 25.4 0.14
4.85 X.S 31.75 0.24 47.6 0.39 25.4 0.2
25 1″ 33.4 3.38 STD 25.4 0.11 38.1 0.15 22.2 09
4.55 X.S 25.4 0.14 38.1 0.19 22.2 0.11
20 3/4″ 26.7 2.87 STD 28.6 08 11.1 04
3.91 X.S 28.6 0.11 11.1 05
15 1/2″ 21.3 2.78 STD 38.1 08 15.9 04
3.73 X.S 38.1 0.10 15.9 05

ASTM A234 Carbon Steel Buttweld Fittings Dimensions

NOMINAL PIPE SIZE ALL FITTINGS ALL FITTINGS ALL FITTINGS ELBOWS AND TEES 180 DEG RETURN BENDS 180 DEG RETURN BENDS 180 DEG RETURN BENDS REDUCERS CAPS
NPS O.D. at Bevel (1), (2) I.D. at End 
(1), (3), (4)
Wall Thickness (3) Centre-to-End Dimension A,B,C,M Centre-to-Centre O Back-to-Face K Alignment of Ends U Overall Length H Overall Length E
½ to 2½ 0.06 
-0.03
0.03 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.12
3 to 3 ½ 0.06 0.06 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.12
4 0.06 0.06 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.12
5 to 8 0.09
-0.06
0.06 Not less than 87.5% of nominal thickness 0.06 0.25 0.25 0.03 0.06 0.25
10 to 18 0.16
-0.12
0.12 Not less than 87.5% of nominal thickness 0.09 0.38 0.25 0.06 0.09 0.25
20 to 24 0.25
-0.19
0.19 Not less than 87.5% of nominal thickness 0.09 0.38 0.25 0.06 0.09 0.25
26 to 30 0.25
-0.19
0.19 Not less than 87.5% of nominal thickness 0.12 0.19 0.38
32 to 48 0.25
-0.19
0.19 Not less than 87.5% of nominal thickness 0.19 0.19 0.38

ASTM A105 Carbon Steel Forged Fittings Dimensions

Size OD WT SR 90 Deg Elbows Centre – Face A Weight LR 90 Deg Elbows Centre – Face A Weight SR 45 Deg Elbows Centre – Face B Weight
mm inch. mm mm SCH mm kg mm kg mm kg
500 20″ 508 9.52 STD 508 93.5 762 140 318 85
12.7 X.S 508 124 762 186 318 112.5
450 18″ 457 9.52 STD 457 75.6 686 113 286 56.5
12.7 X.S 457 100 686 150 286 75
400 16″ 406.4 9.52 STD 406 59.5 610 89.3 254 45
12.7 X.S 406 78.7 610 118 254 59
350 14″ 355.6 9.52 STD 356 45.4 533 68.1 222 34.1
12.7 X.S 356 60 533 90 222 45
300 12″ 323.9 9.52 STD 305 35.4 457 53.1 190 26.6
12.7 X.S 305 46.7 457 70 190 35
250 10″ 273.9 9.27 STD 254 24.1 381 36.1 159 18.1
12.7 X.S 254 32.5 381 48.8 159 24.4
200 8″ 219.1 8.18 STD 203 13.6 305 20.4 127 10.2
12.7 X.S 203 20.9 305 30.9 127 15.5
150 6″ 168.3 7.11 STD 152.4 6.8 229 10.1 95.2 5.1
10.97 X.S 152.4 10.2 229 15.3 95.2 7.7
125 5″ 141.3 6.65 STD 127 4.8 190 6.8 79.4 3.4
9.5 X.S 127 6.5 190 10 79.4 5
100 4″ 114.3 62 STD 101.6 2.8 152.4 4.2 63.5 2.1
8.56 X.S 101.6 3.9 152.4 5.7 63.5 2.9
80 3″ 88.9 5.49 STD 76.2 1.45 114.3 2.18 50.8 1.1
7.62 X.S 76.2 1.95 114.3 2.86 50.8 1.45
65 21/2″ 73 5.16 STD 63.5 0.95 95.2 1.46 44.4 0.73
71 X.S 63.5 1.27 95.2 1.82 44.4 0.91
50 2″ 60.3 3.91 STD 50.8 0.5 76.2 0.72 34.9 0.36
5.54 X.S 50.8 0.68 76.2 1 34.9 0.5
40 11/2″ 48.3 3.68 STD 38.1 0.26 57.1 0.4 28.6 0.2
58 X.S 38.1 0.35 57.1 0.5 28.6 0.25
32 11/4″ 42.2 3.56 STD 31.75 0.18 47.6 0.28 25.4 0.14
4.85 X.S 31.75 0.24 47.6 0.39 25.4 0.2
25 1″ 33.4 3.38 STD 25.4 0.11 38.1 0.15 22.2 09
4.55 X.S 25.4 0.14 38.1 0.19 22.2 0.11
20 3/4″ 26.7 2.87 STD 28.6 08 11.1 04
3.91 X.S 28.6 0.11 11.1 05
15 1/2″ 21.3 2.78 STD 38.1 08 15.9 04
3.73 X.S 38.1 0.10 15.9 05

Major Industrial Carbon Steel Fittings & Flanges Export Countries

United Arab Emirates (UAE), Jordan, Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, United States of America (USA), Singapore, Malaysia, Azerbaijan, Armenia, Georgia, Egypt, Algeria, Nigeria, South Africa, Kenya, Morocco, Ethiopia, Ghana, Tanzania, Sudan, Uganda, Angola.