Butt weld elbows, tees, reducers, caps and stub ends to ASME B16.9 and ASTM A234 WPB, 1/2 to 48 inch, in carbon, alloy and stainless steel.
- Standard: ASME B16.9, ASME B16.25, ASTM A234, ASTM A403, ASTM A420, MSS SP-43, MSS SP-75
- Grades: WPB, WPC, WP1, WP5, WP9, WP11, WP22, WP91, WP304, WP304L, WP316, WP316L, WP321, WPL6
- Certificate: EN 10204 3.1 with every order, 3.2 on request
Mejor Steel is the export agent for the mills that make your material: one contract, one delivery date, and the mill named on the quotation. How we supply
We reply within one business day, Monday to Friday 09:00-18:00 CST. Or write to info@mejorsteel.com / WhatsApp.
Specifications
| Outer diameter | 1/2" - 48" (DN15 - DN1200) |
|---|---|
| Wall thickness | SCH 10 - SCH XXS, matched to the pipe |
| Schedule | SCH 10, 20, 40, 80, 160, XXS, STD, XS |
| Length | Centre-to-end per ASME B16.9 |
| Ends | Bevelled to ASME B16.25, 37.5 deg +/- 2.5 deg |
| Surface treatment | Black, varnish, galvanized, sand blasted or epoxy coated |
| Manufacturing process | Seamless or welded, hot formed or cold formed |
| Pressure rating | Per ASME B16.9 wall thickness and ASME B31.3 design |
| Connection type | Butt weld |
A butt weld fitting is joined to the pipe with a full penetration circumferential weld, so the joint can be radiographed and the bore stays smooth. Almost every butt weld enquiry comes down to four things: which fitting family, which standard and wall schedule, which grade, and whether the ends are bevelled to match the pipe.
As a butt weld fittings supplier, Mejor Steel supplies elbows, tees, reducers, caps and stub ends from China to ASME B16.9 and ASTM A234 WPB, from 1/2 in to 48 in, in carbon steel, alloy steel and stainless steel, with the mill test certificate to EN 10204 3.1 with every order.
What we supply: families, standards and size range
Each family below has its own page with the dimensional detail, grade list and ordering notes. This page is the entry point for the line as a whole.
| Family | Standard | Size range | Wall / schedule | Page |
|---|---|---|---|---|
| Elbow, 45 / 90 / 180, long and short radius | ASME B16.9 | 1/2 – 48 in (DN15 – DN1200) | SCH 10 – SCH XXS | Butt weld elbow |
| Tee, equal and reducing | ASME B16.9 | 1/2 – 48 in | SCH 10 – SCH XXS | Butt weld tee |
| Reducer, concentric and eccentric | ASME B16.9 | 3/4 x 1/2 – 48 x 24 in | SCH 10 – SCH XXS | Butt weld reducer |
| Cap | ASME B16.9 | 1/2 – 48 in | SCH 10 – SCH XXS | Butt weld cap |
| Stub end, long and short pattern | ASME B16.9 | 1/2 – 24 in | SCH 10 – SCH XXS | Used with lap joint flanges |
| Stainless butt weld fittings | ASTM A403 / ASME B16.9 | 1/2 – 48 in | SCH 10S – SCH 80S | Stainless butt weld fittings |
What decides the fitting: standard, schedule and grade
The standard fixes the dimensions, not the wall. ASME B16.9 sets the centre-to-end, the outside diameter at the ends and the tolerances; the wall thickness comes from the pipe schedule the fitting has to match. A 6 in SCH 40 elbow and a 6 in SCH 80 elbow are the same shape and a different weight, and they are not interchangeable on a line that has to be radiographed.
The grade follows the pipe and the service. ASTM A234 WPB is the default carbon steel grade for general and moderate temperature service. WPL6 is the low temperature grade to ASTM A420, used where impact testing is specified. Alloy grades such as WP11, WP22 and WP91 follow the Cr-Mo pipe grades, and WP304 / WP316 follow the stainless pipe.
The ends are bevelled to ASME B16.25, normally 37.5 degrees plus or minus 2.5 degrees, with a root face that suits the welding procedure. Where the fitting is welded to a pipe of a different schedule, the bore has to be stated, because a standard B16.9 fitting is bored to the matching schedule.
How a butt weld order is fixed
Four things have to be settled before a price means anything: the family and the angle or reduction, the size and wall schedule, the grade and the standard, and the end preparation. Quantity and destination port follow. A fitting enquiry that gives only the size comes back with a question, because the schedule changes the weight and the price more than the size does.
Where the line is already designed, the pipe schedule is on the isometric and the grade is on the line class. Where the order is a replacement or a top-up, the marking on the existing fitting is the fastest way to get it right: the heat number and the grade are stamped or stencilled on the body.
Where butt weld orders go wrong
| What goes wrong | Why it happens | What prevents it |
|---|---|---|
| The fitting does not match the pipe wall | The schedule was not stated, so the fitting was bored to a different wall | Give the pipe schedule and the grade on the enquiry |
| The elbow radius is wrong | Long radius is assumed, but the isometric called for short radius | State LR or SR, and the angle, on every elbow line |
| The tee branch is the wrong size | The reducing tee was ordered as equal | State both run and branch sizes, for example 8 x 4 in |
| The grade does not match the pipe | WPB was supplied where the line class called for WP11 or WPL6 | Quote the line class or the pipe grade, not just carbon steel |
| The ends will not line up | The bevel or the root face does not suit the welding procedure | State the end preparation, or send the welding procedure |
Frequently asked questions
What is the difference between a butt weld fitting and a socket weld fitting?
A butt weld fitting is welded to the pipe end with a full penetration butt weld, so the joint can be radiographed and is used for larger sizes and higher pressure. A socket weld fitting takes the pipe into a socket and is fillet welded outside, which is used on small bore lines, normally up to 4 in, where radiography is not required.
Does a butt weld fitting have to match the pipe schedule?
Yes. A B16.9 fitting is made to match the wall of the pipe it joins. A SCH 40 fitting on a SCH 80 line leaves a step at the bore that shows up on a radiograph and creates turbulence, so the schedule is part of the specification, not an afterthought.
Can butt weld fittings be supplied in stainless steel?
Yes. Stainless butt weld fittings are supplied to ASTM A403 and ASME B16.9 in WP304, WP304L, WP316, WP316L and WP321, in schedule 10S to 80S. They are a separate line with their own page, because the grade and the pickling passivation requirements differ from carbon steel.
What certificate comes with the fittings?
EN 10204 3.1 is issued with every order, and 3.2 can be arranged where the project asks for it. Third-party inspection by SGS, BV or TUV can be booked before shipment, and the fittings are marked with the size, grade and heat number.
What to state on the enquiry
Family and angle or reduction, size and wall schedule, grade and standard, end preparation, quantity and destination port. Send the isometric or the line class where one exists, and the reply will come back with availability and pricing within one business day.
Mejor Steel is the export agent for the mills that make your material: one contract, one delivery date, and the mill named on the quotation. Send the specification and the destination port and we will reply with availability and pricing.
What decides the price
There is no list price for fittings: the same drawing can be quoted at different numbers depending on seven things. Send them and the quotation comes back within one business day.
| Factor | Why it moves the price | What to send |
|---|---|---|
| Material grade | ASTM A234 WPB is the baseline; WP11, WP22, WP91, WP304/316 and duplex grades cost more and take longer to source | The grade, or the line class |
| Size and wall schedule | Weight and forming time rise with both; the schedule is part of the fitting, not an afterthought | NPS and schedule (SCH 40, 80, 160, XXS) |
| End preparation | A bevelled end to ASME B16.25, a socket or a thread are different machining operations | Butt weld, socket weld or threaded |
| Manufacturing route | A seamless fitting and a welded one are not the same cost at the same size | Seamless or welded, if the specification requires one |
| Quantity | Setup is spread over the pieces; a small lot carries more per piece | Pieces, or total weight |
| Inspection and certificate | Radiography, PMI, EN 10204 3.2 and third-party inspection add cost and time | 3.1 or 3.2, NDT and whether SGS, BV or TUV is required |
| Destination and Incoterm | Freight and packing follow the port | Destination port, FOB / CFR / CIF |
Reply within one business day. Send the seven items above with the quantity and the destination port. Send the specification or WhatsApp the specification.
Materials
- Carbon steel
- Alloy steel
- Stainless steel
- Low temperature carbon steel
Typical applications
- Oil and gas pipeline construction
- Petrochemical and refinery piping
- Power plant piping systems
- Water treatment and desalination
- Shipbuilding and marine piping
Inspection & testing
- Dimensional inspection per ASME B16.9
- Radiographic or ultrasonic weld examination
- PMI on alloy and stainless steel
- Hardness testing
- Hydrostatic test on request
- Third-party inspection (SGS, BV, TUV)
| Packaging | Sea-worthy export packing: wooden cases or pallets, tagged with size, grade and heat number; corrosion protection on request. |
|---|---|
| MOQ | By piece - mixed sizes accepted; no minimum on standard items. |
| Lead time | Stock items: 5-10 days. Made to order: 3-5 weeks after order confirmation. |
Payment: T/T 30% deposit with the balance before shipment; L/C at sight also accepted. Final terms are confirmed on the quotation.
How we supply: sourced through partner mills; the producing mill is named on the quotation. How we supply sets out who is accountable for the order.
Need this product? Send the size, grade, quantity and destination port and we will reply with availability and pricing.
Request a quotation