Hot Rolled Black Pipe
About Hot Rolled Black Pipe
Hot rolled black pipe is a carbon steel product offering excellent weldability and a minimum tensile strength of 60,000 PSI. It conforms to ASTM A53 Grade B specifications for pressure and mechanical applications.
Quick Facts
- Material: Carbon Steel
- ASTM Standard: A53 Grade B
- Available Sizes: 1/2" to 1-1/2" NPS, Schedule 10 & 40
- Location: Los Angeles warehouse
- Services: Custom size, same-day pickup
Overview
Hot rolled black pipe is a versatile and economical steel product widely used for fluid and gas transfer, as well as structural purposes. The term "black" refers to the dark iron oxide scale left on the surface during the hot rolling manufacturing process. This finish provides minor corrosion resistance but is primarily intended for indoor applications or where a subsequent coating will be applied. It is not suitable for potable water.
Manufactured to meet ASTM A53 Grade B standards, this pipe is designed for coiling, bending, and flanging. It's a common choice for plumbing, fire sprinkler systems, and low-pressure conveyance of steam, gas, and air. Its strength and weldability also make it a reliable material for building handrails, fencing, and other lightweight structural frames where dimensional precision is less critical than that of mechanical tubing.
Technical Specifications
Mechanical Properties (ASTM A53 Grade B)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 60,000 | PSI |
| Yield Strength | 35,000 | PSI |
| Elongation | 22 | % |
Applicable Standards
- ASTM A53: Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless.
Common Applications
- Plumbing & HVAC: Natural gas lines, compressed air piping, and low-pressure steam lines - chosen for its pressure rating and low cost.
- Fire Protection: Fire sprinkler system pipework - meets regulatory standards for fire suppression systems.
- Construction: Scaffolding, support posts, and handrails - provides good structural strength for its weight.
- Industrial: Process piping for oil and non-corrosive fluids - a durable choice for general-purpose conveyance.
- Fencing & Enclosures: Fence posts, gates, and kennel panels - strong and easy to weld into custom configurations.
- Fabrication: Furniture frames, shelving units, and decorative architectural elements - easily worked and accepts various finishes.
Working with Hot Rolled Black Pipe
Machining
Black pipe is readily machinable with standard equipment. The surface scale can be abrasive to tooling, so removing it prior to precise operations is recommended. Using proper speeds and feeds with coolant will produce a good finish.
Welding
A53 Grade B steel has excellent weldability. It can be welded using all common techniques, including MIG (GMAW), TIG (GTAW), and stick (SMAW), without the need for pre-heating or post-heating in most sections. The surface scale should be ground away at the weld joint for best results.
Finishing
The iron oxide scale must be removed by grinding, sandblasting, or chemical pickling before applying a finish. Once cleaned, the pipe can be painted, powder-coated, or oiled to prevent rust. It is not suitable for galvanizing without complete surface preparation.
Related Products
Frequently Asked Questions
Q: What is the difference between black pipe and galvanized pipe?
A: The primary difference is the surface coating. Black pipe is uncoated carbon steel with a dark iron oxide scale. Galvanized pipe is coated with a layer of zinc to provide excellent corrosion resistance, making it suitable for outdoor and water line applications.
Q: Can I use black pipe for drinking water lines?
A: No. Black pipe is not intended for potable (drinking) water. The uncoated steel will rust when exposed to water and can contaminate it. Galvanized pipe, copper, or PEX tubing should be used for potable water.
Q: What does a pipe's 'Schedule' (e.g., Schedule 40) mean?
A: The schedule number indicates the wall thickness of the pipe. For a given nominal pipe size, a higher schedule number means a thicker wall, a higher pressure rating, and greater structural strength. Schedule 40 is a standard, common thickness, while Schedule 10 is lighter.
Stock & Custom Sizes
Available nominal sizes: 1/2" to 1-1/2" NPS in Schedule 10 and Schedule 40. Standard lengths are 21 ft.
Same-day cutting and Los Angeles pickup available.
View Sizes & PricingNeed Hot Rolled Black Pipe? Contact Bobco Metals for availability and Los Angeles pickup.
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