Building Services & Plant Pipework
Bare pipe suits later shop treatment; oil or varnish adds temporary handling protection. A specified project coating is a separate finish choice.
Heating circuits · Utility lines · Mechanical rooms
Black Steel Pipe Manufacturer
ASTM A53 Grade B · ERW and seamless pipe for bulk orders
We supply ASTM A53 Grade B black steel pipe for distributors, mechanical contractors and fabricators. Choose ERW or seamless construction, Schedule 40 or 80, and full lengths or cut pieces. Pipe-end preparation and export packing can be included in the same order.
Black Pipe for Mechanical Services & Fabrication
Full lengths suit workshops that cut and weld their own pipe. Finished pieces suit repeat assemblies where the length and connection are already defined. Both formats are available for wholesale orders, with each size priced separately.
Fabrication & Equipment Frames
For frames, rails and supports, cut lengths and deburred ends reduce the preparation left to your workshop. Drawings that call for structural HSS retain their specified material standard; A53 pipe is quoted as a separate product.
Round-pipe frames · Supports · Fabricated components
ASTM A53 Black Steel Pipe Specifications
| Item | Supply Range |
|---|---|
| Product | Non-galvanized carbon-steel round pipe; bare, oiled or coated finish |
| Manufacturing type | ERW (Type E) and seamless (Type S) |
| Standards & grades | ASTM A53/A53M Grade B |
| Nominal pipe size | NPS 1/8–26 (DN 6–650) |
| Wall designation | Schedule 40, Schedule 80 and other specified wall thicknesses |
| Length formats | 6 m, 12 m and custom cut lengths |
| Base surface | Black mill finish without a zinc coating; surface condition identified on the order |
| Protection options | Rust-preventive oil, varnish or a specified protective coating |
| Connection options | Plain, beveled, threaded or grooved ends; thread and groove details to order |
| Additional processing | Cutting, end facing, deburring and drawing-based preparation |
| Inspection & records | Material certificate, dimensional checks and specified pipe-test records |
| Packing & delivery | Size-separated bundles, timber supports, end protection and itemized packing lists |
The quote separates material, end processing and coating costs. Quantity and production timing are assessed for each size and wall combination.
Black Steel Pipe Sizes: Schedule 40 & 80
The table pairs each nominal pipe size with its actual outside diameter and Schedule 40 or 80 wall. These selections support A53 Grade B purchase lists; the pipe route and finished length complete each item.
Swipe left to see all columns.
| NPS | DN | Outside diameter (mm) | Sch 40 wall (mm) | Sch 80 wall (mm) |
|---|---|---|---|---|
| 1/2 | 15 | 21.3 | 2.77 | 3.73 |
| 3/4 | 20 | 26.7 | 2.87 | 3.91 |
| 1 | 25 | 33.4 | 3.38 | 4.55 |
| 1 1/2 | 40 | 48.3 | 3.68 | 5.08 |
| 2 | 50 | 60.3 | 3.91 | 5.54 |
| 3 | 80 | 88.9 | 5.49 | 7.62 |
| 4 | 100 | 114.3 | 6.02 | 8.56 |
| 6 | 150 | 168.3 | 7.11 | 10.97 |
| 8 | 200 | 219.1 | 8.18 | 12.70 |
Dimensions are nominal values to ASME B36.10M. Product tolerances follow the ordered A53 specification; a schedule number does not by itself establish a service pressure.
End Processing & Protective Finishes
Cutting, facing and connection preparation can be purchased with the pipe. We work from the finished-piece dimensions so the quotation covers the work your team would otherwise complete after receipt.
Cutting, Threading & Grooving
NPT threads, coupling grooves and weld bevels require different end geometry. Each cut piece retains its item reference, finished length and specified connection; groove dimensions also depend on the coupling profile and pipe wall.
Match the ordered groove profile with the grooved couplings and fittings selected for that pipe size and wall.
- Length preparation
- Fixed-length cutting, facing and removal of internal and external burrs
- Threaded joints
- NPT or specified thread form, with matching protectors or sockets
- Welded / grooved joints
- Bevel preparation or roll grooves to the specified connection system
Prepared Connections After Finishing
The finish stops at the joint areas defined for assembly: thread engagement, gasket seating or the weld cutback. These areas are identified with the surface-treatment scope.
- Threaded pieces
- Threaded ends retain the specified engagement area clear of incompatible finishing material.
- Grooved pieces
- The gasket seat and groove remain usable for the selected coupling after finishing.
- Weld-prepared pieces
- Bevel faces and the defined uncoated end band remain accessible for fit-up.
A53 Pipe Identity & Connection Checks
Material identity, dimensions and test results are checked together before release. The shipment records connect the specified pipe route and grade to the packed order lines.
Pipe Manufacturing & Finishing
ERW pipe is formed from steel strip and joined along a longitudinal seam. Seamless pipe uses a billet-based route. We supply the route named in the order, with its required sizing, heat treatment and end preparation.
Dimensional & Surface Inspection
We check the ordered thread, groove or bevel geometry and the finished length after end work, alongside the pipe diameter, wall and surface condition.
Material Identity
Grade, manufacturing type and heat or batch references connect the pipe to its material certificate.
Connection Dimensions
End checks cover the ordered squareness, bevel, thread or groove geometry.
Specified Pipe Tests
Mechanical and specified hydrostatic or nondestructive test results follow the applicable pipe standard.
Shipment Documents
The delivery pack includes the agreed material and inspection records, plus size, quantity and bundle references.
Packaging & Delivery
Bundles Organized by Order Line
Bundles separate diameter, wall, length and grade. Steel straps and timber supports secure full-length pipe; short cut pieces have their own counts and packing-list entries.
Dry Storage & Pipe-End Protection
End caps protect openings and machined threads. Covered handling and dry storage limit exposure before dispatch; longer storage or marine transport can be included in the preservation requirements.
Loading & Receiving
Pipe length and bundle weight determine the loading arrangement. Mixed sizes remain separated, with package references that help your receiving team check quantities and allocate material.
Wholesale orders & project deliveries
We quote the product, processing, packing and agreed freight scope as separate items. Consolidated or phased shipments can follow the project sequence, with production and transport shown separately.
Black Steel Pipe FAQ
Can I combine sizes in a wholesale order?
Yes. Different sizes can share a purchase list and shipment. Any production or processing minimum applies to the individual order line and is identified in the quote.
Can ERW replace seamless pipe on my list?
Only when the project accepts the change. Both routes are offered, but the material specification and inspection requirements remain part of the purchase agreement.
Can I arrange third-party inspection?
Yes. We coordinate access and the agreed witness points before shipment. The inspection scope and required release documents belong in the order so production and the inspector use the same acceptance basis.
Is this pipe approved for every fire or drinking-water system?
The required product listing or approval must match the actual system. A53 designation and black finish alone do not establish it; we review these requirements separately from ordinary pipe supply.
How do I report a delivery issue?
The order number, affected bundle reference and receiving photographs let us trace the shipment. We review the material and inspection records, identify the affected quantity and agree the next action under the order terms.
How is the finished length checked after threading or beveling?
The order identifies the required piece length and its end reference. Checks after end processing use that same reference, so the delivered dimensions match what the cutting and receiving teams are working to.
Get a Quote for Black Steel Pipe
Send a short requirement or attach your pipe schedule and note the destination. We will return an itemized quote covering material, preparation, quantity and delivery scope; details already in the attachment need not be copied into the message.