Alloy Steel Grades

Comprehensive Range of Alloy Steel Buttweld Fittings – ASTM A234 WP1/WP5/WP9 & A182 F1/F5/F9 Flanges & Forged Elbows – WNRF, SORF, SW, Threaded, Elbows, Tees, Reducers | ANSI, DIN, EN Standards .

Alloy steel is a premium material class engineered for high-strength and high-temperature applications. We offer a wide range of pipe fittings, flanges, and branch connections manufactured from top alloy steel grades including ASTM A182 F1, F5, F9, F11, F22, F91 and ASTM A234 WP1, WP5, WP11, WP22, WP91. These components are widely used in refineries, power plants, petrochemical, and thermal processing industries where durability under extreme conditions is critical.

Our alloy steel inventory includes buttweld pipe fittings (Elbows, Tees, Reducers, Caps, Stub Ends), forged fittings (Socket Weld & Threaded Elbows, Tees, Couplings, Plugs, Unions), flanges (WNRF, SORF, BLRF, Threaded, Lap Joint, RTJ), and branch outlet fittings like Weldolet, Sockolet, and Threadolet. All products adhere to ANSI/ASME B16.5, B16.9, B16.11, MSS SP-97, MSS SP-83, and DIN/EN specifications ensuring global compatibility.

Fittings are available in sizes from ½” NB to 48” NB. Flange pressure classes include Class 150, 300, 600, 900, 1500, and 2500, as well as PN6 to PN64. Forged fittings are supplied in pressure ratings of 2000#, 3000#, 6000#, and 9000#. Buttweld fittings are manufactured in wall thickness ranging from SCH 10 to SCH XXS and comply with ASME B36.10/36.19 dimensional standards. Our olets support branch sizes from ½” to 24” for header pipes up to 36”.

All products are manufactured as per ASTM A182 and A234 standards with strict quality control under ISO 9001:2015 systems. Heat treatment, PMI testing, hydrotesting, ultrasonic inspection, and third-party inspection are standard practices. With material sourcing from reputed mills in Europe, Japan, and India, we ensure full traceability and documentation including EN 10204 3.1/3.2 certificates. Our alloy steel range is extensively used in high-pressure steam lines, boiler systems, power generation, and oil & gas pipelines.

Global Supplier of Alloy Steel Fittings & Flanges – Buttweld (Elbows, Tees, Reducers, Caps, Stub Ends), Forged SW/Threaded Fittings (Elbows, Tees, Couplings, Unions, Plugs) – Flange Types: WNRF, SORF, BLRF, SWRF, RTJ, Lap Joint – Sizes ½” to 48” – ASME B16.9, B16.11, B16.5, B16.47, MSS SP-75 – Class 150 to 2500, SCH 10 to XXS – ISO Certified Export Quality

Industrial Alloy Steel Specifications

Material Grade ASTM A182 F1, F5, F9, F11, F22, F91 (Forged Fittings, Flanges), ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91 (Buttweld Fittings)
Available Product Types Flanges (WNRF, SORF, Blind, Socket Weld, Threaded, RTJ) & Forged Fittings (Elbows, Tees, Reducers, Couplings, Unions, Bushings, Caps)
Flanges Size Range ½” NB to 24” NB
Flange Pressure Class 150#, 300#, 600#, 900#, 1500#, 2500#
Forged Fittings Size ½” NB to 4” NB (Socket Weld & Threaded)
Fitting Pressure Class Class 2000#, 3000#, 6000#
Standard Specifications ASTM A182 / ASME SA182
Manufacturing Standards ASME B16.5 (Flanges), ASME B16.11 (Forged Fittings), MSS SP‑83, MSS SP‑44 (Flanges), MSS SP‑95
Flange Types Weld Neck, Slip‑On, Socket Weld, Threaded, Blind, Ring‑Type Joint
Forged Fitting Types 90° Elbow (LR/SR), 45° Elbow, Equal Tee, Reducing Tee, Cross, Full/Half Coupling, Union, Bushing, Cap
Size Range ½” NB to 24” NB (Seamless), ½” NB to 48” NB (Welded)
Wall Thickness SCH 10, SCH 20, SCH 40, SCH 80, SCH 120, SCH 160, XXS
Standard Specifications ASTM A234 / ASME SA234, ANSI B36.10, B36.19
Manufacturing Standards ASME B16.9, MSS SP-75, 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
Form Seamless, Welded, Fabricated
Heat Treatment Normalized, Tempered, Quenched & Tempered (per grade)
Mechanical Properties Tensile Strength: 380–620 MPa (varies by grade) Yield Strength: 205–415 MPa (varies by grade) Elongation: ≥20%
Testing & Certifications ISO 9001:2015, EN 10204 3.1/3.2 MTC, PMI, UT, Radiography, Hydrostatic Test, NACE MR0175
Surface Finish Pickled, Passivated, Sand Blasted, Black Coated
Manufacturing Capabilities Hot Forging, CNC Machining, Beveling, Induction Heat Treatment, Custom Fabrication
Raw Material Sources India, Japan, South Korea, USA, Germany, Italy
Export Destinations USA, Canada, UAE, Saudi Arabia, Qatar, Oman, Egypt, South Africa, Nigeria, Australia, Europe

Industrial Alloy Steel Standards

ANSI/ASME B16.47 Flanges ANSI/ASME B16.36 Flanges ANSI/ASME B16.5 Flanges Pr. EN1902-1 Flanges
DIN Flanges JIS Flanges BS 4504 Flanges BS 10 Flanges
MSS SP-44 Flanges JIS B2220 Flanges KS B1503 Flanges UNI Flanges
SABS/SANS 1123 Flanges AS 2129, AS 4087 Flanges ISO 9624, ISO 7005-1 Flanges AWWA Flanges Standard
GOST Standard Flanges API Flanges AS/ANZ 4331.1 Flanges Series A Flange
Series B Flange SAE J518 Flanges GB Flange Norwegian Standard Flanges
ASME B16.11 – Forged Steel Fittings, Socket-Welding and Threaded BS 3799 – Screwed and Socket-Welding for the Petroleum Industry MSS SP-79 – Socket-Welding Reducer Inserts MSS SP-83 – Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
MSS SP-95 – Swage(d) Nipples and Bull Plugs MSS SP-97 – Integrally Reinforced Forged Branch Outlet Fittings DIN 2986 – Threaded Fittings DIN 2999 – Pipe Threads for Fittings (British Standard Pipe Threads)
ISO 49 – Malleable Iron Fittings, Threaded ISO 7/1 – Pipe Threads Where Pressure-tight Joints Are Made on the Threads EN 10241 – Steel Threaded Pipe Fittings JIS B2316 – Japanese standard for forged pipe fittings.
ANSI/ASME B16.9 – Factory-Made Wrought Steel Buttwelding Fittings ANSI/ASME B16.28 – Wrought Steel Short Radius Elbows and Returns ANSI/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 Fittings DIN 2616 – Butt welding Pipe Fittings: Reducers DIN 2617 – Butt welding Pipe Fittings: Caps DIN28011 – Dished Ends(used in pressure vessels)
EN10253-1 Butt-welding Pipe Fittings(Non Alloy Steels) EN10253-2 Butt-welding Pipe Fittings(Stainless/Alloy Steels)

Alloy Steel International Standards

STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
ASTM A182 F1 1.5415 K12822 STPA 20 3604 12Х1МФ 15CD2.05 16Mo3
ASTM A182 F5 1.7362 K41545 STPA 25 622-490 15Х5М 15CD5.05 13CrMo44
ASTM A182 F9 1.7380 K90941 STPA 23 622-490 15Х9М 15CD9.05 10CrMo9-10
ASTM A182 F11 1.7335 K11597 STPA 22 621-550 12Х1МФ 15CD2.05 13CrMo4-5
ASTM A182 F22 1.7383 K21590 STPA 24 621-570 12Х2М 15CD2.25 10CrMo9-10
ASTM A182 F91 1.4903 K90901 STPA 28 620-590 Z15CDNbV12.1 X10CrMoVNb9-1
STANDARD WERKSTOFF NR. UNS JIS BS GOST AFNOR EN
ASTM A234 WP1 1.5415 K11522 STPA 20 3604 12Х1МФ 15CD2.05 16Mo3
ASTM A234 WP5 1.7362 K41545 STPA 25 622-490 15Х5М 15CD5.05 13CrMo44
ASTM A234 WP9 1.7380 K90941 STPA 23 622-490 15Х9М 15CD9.05 10CrMo9-10
ASTM A234 WP11 1.7335 K11597 STPA 22 621-550 12Х1МФ 15CD2.05 13CrMo4-5
ASTM A234 WP22 1.7383 K21590 STPA 24 621-570 12Х2М 15CD2.25 10CrMo9-10
ASTM A234 WP91 1.4903 K90901 STPA 28 620-590 Z15CDNbV12.1 X10CrMoVNb9-1

Alloy Steel Chemical Composition

Grade C (%) Mn (%) Si (%) Cr (%) Mo (%) P (%) S (%) Other Elements
ASTM A182 F1 0.10–0.20 0.30–0.80 0.10–0.50 0.50–0.80 0.44–0.65 ≤0.035 ≤0.040
ASTM A182 F5 ≤0.15 0.30–0.60 0.50–1.00 4.00–6.00 0.45–0.65 ≤0.030 ≤0.030
ASTM A182 F9 ≤0.15 0.30–0.60 0.50–1.00 8.00–10.00 0.90–1.10 ≤0.030 ≤0.030
ASTM A182 F11 0.05–0.15 0.30–0.60 0.50–1.00 1.00–1.50 0.44–0.65 ≤0.030 ≤0.030
ASTM A182 F22 0.05–0.15 0.30–0.60 0.50–1.00 1.90–2.60 0.87–1.13 ≤0.030 ≤0.030
ASTM A182 F91 0.08–0.12 0.30–0.60 0.20–0.50 8.00–9.50 0.85–1.05 ≤0.020 ≤0.010 V: 0.18–0.25, Nb: 0.06–0.10, N: 0.03–0.07
Grade C Mn Si P S Cr Mo Other Elements
ASTM A234 WP1 0.10–0.20 0.30–0.80 0.10–0.50 ≤ 0.035 ≤ 0.040 0.50–0.80 0.40–0.65
ASTM A234 WP5 ≤ 0.15 0.30–0.60 0.50 max ≤ 0.030 ≤ 0.030 4.00–6.00 0.45–0.65
ASTM A234 WP9 ≤ 0.15 0.30–0.60 0.25–1.00 ≤ 0.030 ≤ 0.030 8.00–10.00 0.90–1.10
ASTM A234 WP11 0.05–0.15 0.30–0.60 0.50–1.00 ≤ 0.030 ≤ 0.030 1.00–1.50 0.44–0.65
ASTM A234 WP22 0.05–0.15 0.30–0.60 0.50 max ≤ 0.025 ≤ 0.025 1.90–2.60 0.87–1.13
ASTM A234 WP91 0.08–0.12 0.30–0.60 0.20–0.50 ≤ 0.020 ≤ 0.010 8.00–9.50 0.85–1.05 V: 0.18–0.25, Nb: 0.06–0.10, N: 0.03–0.07

Alloy Steel Mechanical Properties

Grade Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (%) Hardness (HBW) Impact Energy (J)
ASTM A182 F1 380 min 205 min 22 min ≤197 27 (typical)
ASTM A182 F5 415 min 205 min 20 min ≤207 27 (typical)
ASTM A182 F9 585 min 275 min 20 min ≤217 27 (typical)
ASTM A182 F11 415 min 205 min 20 min ≤197 27 (typical)
ASTM A182 F22 415–585 205–415 18–22 ≤235 27 (typical)
ASTM A182 F91 585–760 415 min 20 min ≤250 ≥41 (Charpy V-notch @ RT)
Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (HBW) Temperature Range (°C)
ASTM A234 WP1 380 min 205 min 22 min 163 max -29 to 427
ASTM A234 WP5 415 min 205 min 22 min 163 max Up to 593
ASTM A234 WP9 585 min 275 min 20 min 190 max Up to 593
ASTM A234 WP11 485 min 275 min 20 min 187 max Up to 593
ASTM A234 WP22 620 min 415 min 20 min 190 max Up to 650
ASTM A234 WP91 620 min 415 min 20 min 250 max Up to 650

Alloy Steel Types

Flange

RF, FF

Buttweld Fittings

Seamless, Welded

Forged Fittings

Socket weld, Threaded

Olets / Outlets

Weldolet, Sockolet

ASTM A182 Chrome Moly 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 A182 Alloy 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 Alloy 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 A182 Alloy 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 Alloy 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.