What Is Black Iron Pipe?

Black iron pipe is uncoated carbon steel pipe manufactured to ASTM A53 standards. Unlike galvanized pipe, it has no zinc coating — giving it the characteristic dark, matte finish. It is the most widely used pipe for gas transmission, fire sprinkler systems, steam heating, and compressed air applications. Sino East Steel manufactures high-quality black iron pipes in Schedule 40 and Schedule 80 specifications, available in sizes from 1/2″ to 12″ with factory-direct wholesale pricing.

Black welded steel pipes (ASTM A53 Schedule 40) at Sino East Steel factory — available in sizes from 1/2″ to 12″ diameter, 20-ft standard lengths.

🛠 Related Products: SCH 40 Seamless Carbon Steel Pipe | ASTM A106 Grade B Seamless Pipe | 2″ Schedule 40 Steel Pipe | Schedule 80 Pipe Technical Guide

Black Iron Pipe Sizes, Dimensions & Weight Chart

Below is the complete dimensional reference for black iron pipe in both Schedule 40 (standard weight) and Schedule 80 (extra heavy). All data conforms to ASME B36.10 and represents the standard sizes stocked by Sino East Steel.

Standard lengths: 20 ft (6m) or 21 ft (6.4m). All dimensions conform to ASME B36.10. OD = Outside Diameter, ID = Inside Diameter, Wt = Weight per foot.

ASTM A53 ERW black iron pipe close-up — the dark oxide mill scale finish is characteristic of uncoated carbon steel. Ideal for gas lines, fire sprinklers, and steam systems.

Black Iron Pipe Price Guide by Size

Below is a reference pricing guide for the most commonly ordered black iron pipe sizes. Prices are for Schedule 40, 20-foot lengths, FOB Tianjin, China. Contact us for a formal quote — bulk orders receive significant discounts.

Prices are estimated and subject to market fluctuation. Standard lengths are 20 ft (6 meters). Custom lengths and threading available upon request.

Black Iron Pipe vs Galvanized Pipe: What's the Difference?

Black Iron Pipe Fittings

Black iron pipe systems require compatible black malleable iron fittings to create complete piping networks. Common fitting types include:

• Elbows (90°/45°): Change pipe direction
• Tees: Branch a line at 90°
• Couplings: Join two straight pipe sections
• Unions: Detachable connections for maintenance
• Caps & Plugs: Seal pipe ends
• Bushings: Reduce pipe size at connections
• Nipples: Short threaded pipe sections
• Floor Flanges: Mount pipe to flat surfaces

All fittings comply with ASME B16.3 / B16.14. Sino East Steel supplies complete black iron pipe systems — contact us with your bill of materials.

Common Applications

Frequently Asked Questions

What is black iron pipe made of?

Despite the name, black iron pipe is made of carbon steel, not iron. It is manufactured to ASTM A53 Grade B standards. The “black” refers to the dark iron-oxide scale formed during hot-rolling, and “iron” is a traditional term from the early 20th century.

What sizes does black iron pipe come in?

Black iron pipe is available from 1/8″ to 12″ nominal diameter in Schedule 40 (most common) and Schedule 80 (heavy wall). The most purchased sizes are 1/2″, 3/4″, 1″, 1-1/4″, 1-1/2″, and 2″. Standard lengths are 20 ft or 21 ft.

How much does 1/2″ black iron pipe cost for a 20-foot length?

A 1/2-inch Schedule 40 black iron pipe, 20 feet long, weighs approximately 17 pounds. Pricing fluctuates with steel market conditions. For current factory-direct wholesale pricing, contact our sales team — bulk orders receive significant discounts.

Can black iron pipe be used outdoors?

Black iron pipe can be used outdoors but will rust over time. For outdoor applications, consider: 1) painting with rust-inhibiting primer, 2) using galvanized steel pipe instead, or 3) stainless steel for permanent installations.

What type of fittings are used with black iron pipe?

Black iron pipe uses black malleable iron threaded fittings per ASME B16.3 (150 lb) or B16.14 (300 lb). These have tapered NPT threads for a tight seal. Sino East Steel can supply complete pipe + fitting packages.

Is black iron pipe the same as Schedule 40 pipe?

Not exactly. “Black iron pipe” refers to the material/finish (uncoated carbon steel), while “Schedule 40” refers to wall thickness. Most black iron pipe is Schedule 40, but can also be Schedule 80. Specify both when ordering.

Can I weld black iron pipe?

Yes — black iron pipe welds excellently with no toxic zinc fumes, making it preferred for welded systems. Use SMAW, GMAW, or GTAW with standard carbon steel filler metals.

Disclaimer: Pricing is subject to change based on steel market conditions. All dimensions conform to ASME B36.10 and ASTM A53 standards. Contact our sales team for formal quotation.