What Are Carbon Steel Butt Weld Pipe Fittings?
Carbon Steel Buttweld Fittings refer to pipe connection fittings made of steel of up to 2.1% by weight carbon content. They are welded to the ends of the pipes to form a full-bore (through) joint with no internal limitations, and so are the most favored in high-pressure and high-temperature industrial piping systems.
Amardeep Steel Centre is a manufacturer and exporter of Carbon Steel Buttweld Fittings which is located in Mumbai, India. We also provide a full line of CS butt weld pipe fittings — elbows, tees, reducers, caps, stub ends and crosses that meet ASTM A234 WPB, ASME B16.9, ASME B16.28 and MSS-SP-43 standards.
We produce fittings that are utilized in oil and gas pipelines, chemical plants, electrical generation plants, petrochemical refineries, as well as water treatment plants throughout the world. All our fittings are subject to extreme quality tests by our home quality control team prior to shipment.
Our ready stock of large sizes is kept at our warehouse at Mumbai so that we can deliver within a short time on standard sizes. Ordered custom sizes and special grades are produced with a 24 to 4 week lead time.
Carbon Steel Buttweld Fittings Specifications
| Specification | Details |
|---|---|
| Material Standard | ASTM A234 / ASME SA234 WPB, WPBW, WPHY 42/46/52/60/65/70 |
| Low-Temp Grades | ASTM A420 WPL3, A420 WPL6 |
| Dimensions | ASME/ANSI B16.9, B16.28, MSS-SP-43, MSS-SP-79 |
| Size Range | ½" NB to 48" NB (DN 15 to DN 1200) |
| Wall Thickness | SCH 5S, 10S, 20S, STD, 40S, 60, XS, 80, 100, 120, 140, 160, XXS |
| Types | Seamless / ERW / Welded / Fabricated |
| End Finish | Beveled ends (BE) to ASME B16.25 |
| Origin | India (Mumbai) — Exported globally |
Types of CS Buttweld Fittings
We manufacture and supply all standard types of Carbon Steel Butt Weld Pipe Fittings in seamless and welded construction, across the full size and schedule range.
Carbon Steel 90° Elbow
Carbon Steel 45° Elbow
Carbon Steel Equal Tee
Carbon Steel Unequal Tee
Carbon Steel Equal Cross
Carbon Steel Unequal Cross
Carbon Steel Pipe Cap
Carbon Steel Union
Carbon Steel Full Coupling
Carbon Steel Half Coupling
Carbon Steel Reducing Coupling
Carbon Steel Threaded Fittings
ASTM A234 WPB — Grades & Specifications
Carbon Steel Grades
| Grade | Description |
|---|---|
| WPB | Standard service |
| WPBW | Welded & normalized |
| WPHY 42 | High yield 42 ksi |
| WPHY 46 | High yield 46 ksi |
| WPHY 52 | High yield 52 ksi |
| WPH 60 | High yield 60 ksi |
| WPHY 65 | High yield 65 ksi |
| WPHY 70 | High yield 70 ksi |
Low-Temperature CS Grades
| Grade | Standard | Service Temperature |
|---|---|---|
| WPL3 | ASTM A420 | −100°F |
| WPL6 | ASTM A420 | −50°F |
| WPL9 | ASTM A420 | −150°F |
| WPHY 42-70 | ASTM A860 | High-Yield CS |
| X52, X60 | API 5L matching | High-Yield CS |
Applicable Standards
| Standard | Description |
|---|---|
| ASTM A234 | Material spec |
| ASME B16.9 | Factory-made BW fittings |
| ASME B16.28 | Short radius elbows |
| MSS-SP-43 | Lightweight fittings |
| MSS-SP-79 | Socket-welding reducers |
| ASME B16.25 | Bevel end details |
| IBR | Indian Boiler Regulation |
| PED 97/23/EC | European pressure equip. |
Size & Schedule Range (ASME B16.9)
| Nominal Size | OD (mm) | Available Schedules |
|---|---|---|
| ½" NB | 21.3 | SCH 10S, 40S, 80S, XXS |
| ¾" NB | 26.7 | SCH 10S, 40S, 80S, XXS |
| 1" NB | 33.4 | SCH 10S, 40S, 80S, 160, XXS |
| 1½" NB | 48.3 | SCH 10S, 40S, 80S, 160, XXS |
| 2" NB | 60.3 | SCH 5S, 10S, 40S, 80S, 160, XXS |
| 3" NB | 88.9 | SCH 5S, 10S, 40S, 80S, 160, XXS |
| 4" NB | 114.3 | SCH 5S - XXS (all schedules) |
| 6" NB | 168.3 | SCH 5S - XXS (all schedules) |
| 8" NB | 219.1 | SCH 5S - XXS (all schedules) |
| 10" NB | 273.1 | SCH 5S - 160 (all schedules) |
| 12" NB | 323.9 | SCH 5S - 160 (all schedules) |
| 16" - 48" NB | 406.4 - 1219.2 | STD, XS, 20, 30, 40, 60, 80 |
Elbow Radius Dimensions (LR / SR)
| Pipe Size | LR (90°) - A (mm) | SR (90°) - A (mm) |
|---|---|---|
| 1" NB | 38 | 25 |
| 1½" NB | 57 | 38 |
| 2" NB | 76 | 51 |
| 3" NB | 114 | 76 |
| 4" NB | 152 | 102 |
| 6" NB | 229 | 152 |
| 8" NB | 305 | 203 |
| 10" NB | 381 | 254 |
| 12" NB | 457 | 305 |
| 16" NB | 610 | 406 |
| 18" NB | 686 | 457 |
| 24" NB | 914 | 610 |
ASTM A234 WPB Chemical Composition
| Element | Min % | Max % |
|---|---|---|
| Carbon (C) | — | 0.30 |
| Manganese (Mn) | 0.29 | 1.06 |
| Phosphorus (P) | — | 0.05 |
| Sulfur (S) | — | 0.058 |
| Silicon (Si) | — | 0.10 min |
| Copper (Cu) | — | 0.40 max |
| Nickel (Ni) | — | 0.40 max |
| Chromium (Cr) | — | 0.40 max |
| Molybdenum (Mo) | — | 0.15 max |
| Vanadium (V) | — | 0.08 max |
ASTM A234 WPB Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (Min) | 415 (60,200) | MPa (psi) |
| Yield Strength (Min) | 240 (34,800) | MPa (psi) |
| Elongation in 2" (Min) | 22 | % |
| Elongation in 50mm (Min) | 22 | % |
| Hardness (BHN Max) | 197 | HBW |
| Operating Temp Range | −29 to +425 | °C |
| Density | 7.85 | g/cm³ |
| Modulus of Elasticity | 200 | GPa |
Carbon Steel Buttweld Fittings for Industries
Carbon Steel Buttweld Fittings are used across critical process industries where reliable, high-pressure pipe connections are essential.
- Oil & Gas: Upstream, midstream & downstream pipelines, refineries, LNG terminals
- Chemical & Petrochemical: Process piping in chemical plants, fertilizer units & acid handling systems
- Power Generation: Steam lines, boiler piping, turbine connections in thermal & nuclear power plants
- Pulp & Paper: High-temperature & pressure process lines in paper manufacturing
- Pharmaceuticals: Utility piping systems for WFI, steam & process water in pharma facilities
- Shipbuilding & Marine: Marine piping systems, shipboard fuel & ballast water lines
- Construction & EPC: Large-scale industrial construction, EPC contractors & turnkey projects
- Water & Utilities: Municipal water supply, irrigation systems, sewage treatment plants
Why Choose Us for CS Buttweld Fittings?
Large Ready Stock
Extensive inventory maintained at our Mumbai warehouse ensures same-week dispatch on standard sizes. No waiting for manufacturing on common grades and schedules.
ISO & IBR Certified
ISO 9001:2015 certified quality management system. All fittings available with IBR approval, third-party inspection (TPI), and EN 10204 3.1/3.2 Mill Test Certificates.
Competitive Pricing
Direct manufacturer pricing with no middlemen. We source premium raw materials from certified mills and pass cost efficiencies to our customers globally.
Custom Manufacturing
Non-standard sizes, special grades (WPHY high yield, low-temperature WPL), and custom wall thicknesses manufactured to order in 2-4 weeks.
Global Export Expertise
25+ years of export experience to 80+ countries. Expertise in documentation (MSDS, NABL lab reports, COC, COO), packing, and shipping requirements.
Quality Testing
Every batch undergoes hardness testing, PMI (positive material identification), hydrostatic testing, radiographic testing, and dimensional inspection before dispatch.
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Frequently Asked Questions - Carbon Steel Buttweld Fittings
What is the difference between buttweld and socket weld fittings?
Buttweld fittings are welded directly to the pipe end-to-end, creating a flush, full-bore joint ideal for high-pressure, high-temperature, and large-diameter piping (typically NPS 2 and above). Socket weld fittings insert the pipe into a recessed socket and are typically used for smaller pipe sizes (up to 2") at lower pressures. Buttweld joints offer superior strength, no internal crevices, and are preferred in critical process applications.
What standards do carbon steel buttweld fittings conform to?
Our Carbon Steel Buttweld Fittings conform to ASTM A234 / ASME SA234 (material specification), ASME/ANSI B16.9 (factory-made wrought buttwelding fittings dimensions), ASME B16.28 (short radius elbows and returns), MSS-SP-43 (standard for light-weight stainless steel buttwelding fittings), and MSS-SP-79. IBR and third-party inspection certificates are available on request.
What sizes are available for CS butt weld pipe fittings?
We supply Carbon Steel Buttweld Fittings from ½" NB to 48" NB (DN 15 to DN 1200) in all standard wall thicknesses: SCH 5S, 10S, 20S, STD, 40S, S40, 60, XS, 80S, S80, 100, 120, 140, 160, and XXS. Non-standard sizes and special schedules can be manufactured to order.
What is the pressure rating of ASTM A234 WPB fittings?
ASTM A234 WPB Carbon Steel Buttweld Fittings have a minimum tensile strength of 415 MPa (60,200 psi) and yield strength of 240 MPa (34,800 psi). The allowable pressure depends on the pipe size, wall thickness (schedule), and operating temperature — calculated per ASME B31.3 Process Piping or ASME B31.1 Power Piping codes as applicable to the system design.
Do you supply IBR-approved carbon steel buttweld fittings?
Yes. Amardeep Steel supplies IBR (Indian Boiler Regulation) approved Carbon Steel Buttweld Fittings with third-party inspection certificates. Documentation available includes IBR Form III-C certificates, NABL-accredited lab reports, EN 10204 3.1 / 3.2 Mill Test Certificates, Positive Material Identification (PMI) reports, hydrostatic test certificates, and dimension inspection reports.
What is the delivery lead time for CS buttweld fittings?
Standard stock items are dispatched within 2-5 business days from our Mumbai warehouse. Custom-manufactured or non-standard specifications have a lead time of 2-4 weeks depending on order volume and specification. We maintain large ready stock of common grades (ASTM A234 WPB) in sizes ½" to 24" NB for urgent requirements.
