Girgaon, Mumbai, Maharashtra 400004, India [email protected] +91 9869506920

Alloy Steel Pipe Fittings Manufacturer

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Engineering Quick Reference
ASTM A234 Material Specifications
Chemical Composition Standards
Mechanical Properties & Tensile Data
ASME B16.9 Dimension Standards
Weight Charts (Sch 10S to Sch 80S)
Pressure-Temperature Rating Tables
Manufacturing Dimensional Tolerances
Gasket Size Coordination Chart
Quality Control & Testing Protocol
Alloy steel buttweld and forged pipe fittings manufacturing yard
High Temperature & High Yield Solutions

Engineered Alloy Steel Buttweld & Forged Fittings

Rajtilak Metal is an Indian manufacturer and global exporter of industrial alloy steel pipe fittings, chrome moly elbows, tees, reducers, stub ends, caps, and forged pressure connections. Engineered to excel in high-pressure thermal generation, steam headers, chemical reactors, and hydrogen refining service, our alloy steel fittings are produced from certified low-alloy and chromium-molybdenum steel stocks.

By precisely balancing Chromium (Cr) and Molybdenum (Mo), our alloy steel fittings provide exceptional high-temperature tensile strength, creep resistance, and resistance to hydrogen embrittlement. Every fitting undergoes stringent quality surveillance in accordance with ASME B16.9, ASME B16.11, MSS SP-75, and Indian Boiler Regulations (IBR).

ISO 9001:2015 IBR Certified EIL Approved EN 10204 3.1 Traceability
  • Full material compliance with ASTM A234 Grades WP1, WP5, WP9, WP11, WP22, WP91, and AISI 4130
  • Seamless & welded buttweld fittings from 1/2″ through 48″ in Schedule 10 through Schedule XXS
  • Computerized thermal normalizing, quenching, and tempering for verified mechanical strength
  • 100% heat code stamping mapped to original steel mill melt certificates
Comprehensive Portfolio

Alloy Steel Buttweld & Forged Components

Manufactured under rigorous process controls for severe piping loops where standard carbon steel does not meet temperature or yield limits.

Alloy Steel 45 and 90 Degree Buttweld Elbows

Alloy Steel 45° / 90° / 180° Elbows

Long radius (1.5D) and short radius (1.0D) seamless buttweld elbows with beveled ends to ASME B16.25.

Alloy Steel Equal and Reducing Tees

Equal & Reducing Tees

Uniform wall thickness and reinforced branch outlets for continuous fluid distribution without pressure dips.

Alloy Steel Concentric and Eccentric Reducers

Concentric & Eccentric Reducers

Precision-tapered transitions designed to manage fluid velocities and prevent cavitation in steam piping.

Alloy Steel End Caps and Stub Ends

End Caps & Lap Joint Stub Ends

Dished elliptical pipe end closures and forged stub ends engineered for backing-flange assembly.

Technical Specification

Standard Specification of Alloy Steel Pipe Fittings

Engineering parameters, pressure ratings, sizing range, and dimensional standards adhered to in our Mumbai production plant.

Product Scope Alloy Steel Pipe Fittings (Elbows, Tees, Reducers, Caps, Crosses, Bends, Stub Ends)
Manufacturing Standards ASME B16.9, ASME B16.28, ASME B16.11, MSS SP-43, MSS SP-75, EN 10253-4, DIN 2605, JIS B2312, BS 1640
Primary Material Grades ASTM / ASME A/SA 234 WP1, WP5, WP9, WP11 (Class 1, 2, 3), WP12, WP22 (Class 1, 3), WP91, WP92, AISI 4130, 4140
Connection Types Buttweld (BW beveled per ASME B16.25), Socket Weld (SW per ASME B16.11), Threaded (NPT / BSPT)
Size Range Seamless: 1/2″ NB to 24″ NB | Welded / Fabricated: 24″ NB to 48″ NB (Large diameters custom forged)
Wall Thickness / Schedules SCH 5S, 10S, 20, 30, 40S, STD, 60, 80S, XS, 100, 120, 140, 160, XXS (Special non-standard thicknesses on request)
Pressure Rating Classes 2000, 3000, 6000, 9000 for forged fittings; pipe-equivalent schedule ratings for buttweld components
Quality Certification EN 10204 Type 3.1 MTC, IBR Form III-C certification, NACE MR0175 / ISO 15156 compliance upon request
Chemical Metallurgy

Alloy Steel Pipe Fittings Chemical Composition (%)

Strictly controlled chemistry ensures high yield strength, resistance to high-temperature scaling, and reliable weldability.

Grade / Element Carbon (C) Manganese (Mn) Phosphorus (P) Sulfur (S) Silicon (Si) Chromium (Cr) Molybdenum (Mo) Vanadium (V)
ASTM A234 WP1 0.10 – 0.20 0.30 – 0.80 0.045 0.045 0.10 – 0.50 — 0.44 – 0.65 —
ASTM A234 WP11 Cl.1 0.05 – 0.15 0.30 – 0.60 0.030 0.030 0.50 – 1.00 1.00 – 1.50 0.44 – 0.65 —
ASTM A234 WP11 Cl.2/3 0.05 – 0.20 0.30 – 0.80 0.040 0.040 0.50 – 1.00 1.00 – 1.50 0.44 – 0.65 —
ASTM A234 WP22 Cl.1 0.05 – 0.15 0.30 – 0.60 0.040 0.040 0.50 max 1.90 – 2.60 0.87 – 1.13 —
ASTM A234 WP22 Cl.3 0.05 – 0.15 0.30 – 0.60 0.040 0.040 0.50 max 1.90 – 2.60 0.87 – 1.13 —
ASTM A234 WP5 Cl.1/3 0.15 max 0.30 – 0.60 0.040 0.030 0.50 max 4.00 – 6.00 0.44 – 0.65 —
ASTM A234 WP9 Cl.1/3 0.15 max 0.30 – 0.60 0.030 0.030 0.25 – 1.00 8.00 – 10.00 0.90 – 1.10 —
ASTM A234 WP91 0.08 – 0.12 0.30 – 0.60 0.020 0.010 0.20 – 0.50 8.00 – 9.50 0.85 – 1.05 0.18 – 0.25
Mechanical Capabilities

Mechanical Properties of Low & High Alloy Steel Fittings

Verified through batch destructive mechanical testing, Charpy V-notch impact tests, and continuous hardness verifications.

Material Grade Tensile Strength min. ksi [MPa] Yield Strength min. ksi [MPa] Elongation in 2 in. (50mm) min. %
Longitudinal Transverse
ASTM A234 WP1 55 – 80 [380 – 550] 30 [205] 20 13
ASTM A234 WP11 Class 1 60 [415] 30 [205] 22 14
ASTM A234 WP11 Class 2 70 [485] 40 [275] 22 14
ASTM A234 WP11 Class 3 75 [520] 45 [310] 22 14
ASTM A234 WP22 Class 1 60 [415] 30 [205] 22 14
ASTM A234 WP22 Class 3 75 [520] 45 [310] 22 14
ASTM A234 WP5 Class 1 60 [415] 30 [205] 22 14
ASTM A234 WP5 Class 3 75 [520] 45 [310] 22 14
ASTM A234 WP9 Class 1 60 [415] 30 [205] 22 14
ASTM A234 WP9 Class 3 75 [520] 45 [310] 22 14
ASTM A234 WP91 90 [620] 60 [415] 20 13
Dimensional Data

ASME B16.9 Elbow Dimensions (Inches & Millimeters)

Engineering center-to-face reference standards for 90-degree and 45-degree long radius / short radius elbows.

NPS Outside Dia. (mm) Outside Dia. (in) 90° LR Center to Face 90° SR Center to Face 45° LR Center to Face 180° Return Center to Center
1/2″ 21.3 0.840 1-1/2″ — 5/8″ 2″
3/4″ 26.7 1.050 1-1/8″ — 7/16″ 2-1/4″
1″ 33.4 1.315 1-1/2″ 1″ 7/8″ 3″
1-1/2″ 48.3 1.900 2-1/4″ 1-1/2″ 1-1/8″ 4-1/2″
2″ 60.3 2.375 3″ 2″ 1-3/8″ 6″
3″ 88.9 3.500 4-1/2″ 3″ 2″ 9″
4″ 114.3 4.500 6″ 4″ 2-1/2″ 12″
6″ 168.3 6.625 9″ 6″ 3-3/4″ 18″
8″ 219.1 8.625 12″ 8″ 5″ 24″
10″ 273.1 10.750 15″ 10″ 6-1/4″ 30″
12″ 323.9 12.750 18″ 12″ 7-1/2″ 36″
Calculated Weights

Alloy Steel Buttweld Fittings Weight Chart (kg)

Theoretical shipping weights per piece across common schedules to assist freight estimation and structural support calculations.

Nominal Size (DN) Schedule 10S Schedule 40S Schedule 80S
90° Elbow 45° Elbow Equal Tee 90° Elbow 45° Elbow Equal Tee 90° Elbow 45° Elbow Equal Tee
DN 25 (1″) 0.14 0.08 0.28 0.15 0.11 0.29 0.22 0.14 0.38
DN 50 (2″) 0.50 0.25 0.85 0.70 0.40 1.28 0.91 0.59 1.59
DN 80 (3″) 1.25 0.63 1.77 2.20 1.08 3.31 2.97 1.50 4.45
DN 100 (4″) 2.10 1.08 3.46 4.47 2.09 5.27 6.18 2.81 7.71
DN 150 (6″) 5.45 2.72 8.07 10.89 5.44 10.99 16.32 8.16 13.61
DN 200 (8″) 10.20 5.33 15.65 21.54 10.77 20.91 33.11 16.56 28.12
DN 250 (10″) 18.15 9.75 26.46 38.56 19.27 35.38 51.71 25.86 49.90
DN 300 (12″) 25.80 13.62 39.46 59.42 29.71 62.14 79.38 39.69 83.91
Pressure Tolerances

Allowable Working Pressures & Manufacturing Tolerances

Engineered to ensure zero leak paths under cycling thermal gradients and continuous hydrostatic head pressures.

Pressure-Temperature Ratings (psig)

Temperature Class 150 Class 300 (1″) Class 300 (2″)
-20°F to 150°F30020001500
200°F26517851350
300°F18513601050
400°F—935750
500°F—510450
550°F—300300

ASME B16.9 Tolerances (mm)

NPS O.D. at Bevel Wall Thickness (T) Center-to-End
1/2″ to 2-1/2″+1.6 / -0.8Not less than 87.5% of nominal thickness±1.6
3″ to 3-1/2″±1.6±1.6
4″±1.6±1.6
5″ to 8″±1.6±1.6
10″ to 18″+4.0 / -3.2±2.4±2.4
Comprehensive Procurement FAQ

Technical Questions Answered for Engineering Teams

What are the common ASTM material grades for alloy steel pipe fittings?
The most widely specified standard is ASTM A234/ASME SA234, covering grades WP1, WP11 (Classes 1, 2, 3), WP12, WP22 (Classes 1, 3), WP5, WP9, and high-performance Grade WP91 for high-temperature creep resistance in power piping and refinery heaters.
What heat treatment is applied to chrome-moly buttweld fittings?
ASTM A234 alloy steel fittings undergo strictly controlled heat treatment depending on the grade, including full annealing, isothermal annealing, or normalizing followed by tempering to ensure optimum grain structure, yield strength, and impact toughness.
Do you provide third-party inspection and EN 10204 3.1 inspection certification?
Yes. All fittings are 100% inspected and delivered with complete EN 10204 Type 3.1 Mill Test Certificates detailing heat numbers, chemical composition, mechanical test results, hardness values, and heat treatment cycles. Third-party inspections by DNV, TUV, Bureau Veritas, SGS, or Lloyd's Register can also be arranged.
What non-destructive examination (NDE) methods are available for high-pressure fittings?
We perform 100% Positive Material Identification (PMI), ultrasonic testing (UT), radiographic testing (RT) on welded seams, magnetic particle inspection (MPI), liquid penetrant testing (PT), and Brinell/Vickers hardness testing.

Request Certified Technical Quotations & Fast Track Delivery

Send your pipe fittings bill of materials, project line classes, and required NDT test criteria directly to our senior estimating engineers.

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