What Is Schedule 80 Steel Pipe?

Schedule 80 steel pipe (also marked as SCH 80 or XS – Extra Strong) is a classification of pipe wall thickness defined by the American National Standards Institute (ANSI). The “schedule” number indicates the wall thickness — the higher the number, the thicker the wall. Schedule 80 pipe has the same Outside Diameter (OD) as Schedule 40, but its thicker wall results in a smaller Inside Diameter (ID) and significantly higher pressure-handling capacity.

At Sino East Steel, we manufacture Schedule 80 pipes in carbon steel, stainless steel, and galvanized finishes. Our factory in Tianjin, China produces to ASTM A53, A106, API 5L, and other international standards. Browse our full range: SCH 80 Seamless Steel Pipe | ASTM SCH 80 Carbon Steel | SCH 80 Stainless Steel 304/316.

Schedule 80 Steel Pipe Dimensions Chart

The following table shows the complete dimensional specifications for Schedule 80 steel pipes from NPS 1/8″ through NPS 24″. All measurements conform to ANSI/ASME B36.10 and B36.19 standards. For specific product availability, see our Schedule 80 Steel Pipes catalog.

Data source: ANSI/ASME B36.10 & B36.19. Looking to buy? Visit our Schedule 80 Steel Pipes product catalog for factory-direct pricing.

Schedule 80 Pipe Pressure Rating (PSI)

The pressure rating of Schedule 80 steel pipe depends on the material grade, pipe size, and operating temperature. Below are the maximum allowable working pressures (MAWP) in PSI for carbon steel Schedule 80 pipe per ASME B31.1 standards.

Notes: Based on ASTM A106 Grade B seamless carbon steel per ASME B31.1. 1 PSI = 6.895 kPa. For stainless steel, ratings are ~15-20% higher. Need a specific pressure rating for your project? Contact our engineering team.

Schedule 80 vs Schedule 40 Steel Pipe Comparison

Schedule 80 Pipe Weight Calculation

Example for 4″ Schedule 80: OD = 4.500″, Wall = 0.337″ → Weight = 10.69 × (4.500 – 0.337) × 0.337 = 14.98 lb/ft (22.32 kg/m)

Available Materials & Standards at Sino East Steel

We manufacture the following Schedule 80 pipe types — click any product to view details and request a quote:

Frequently Asked Questions

What is the wall thickness of 2-inch schedule 80 pipe?

A 2-inch NPS Schedule 80 steel pipe has a wall thickness of 0.218 inches (5.54 mm), OD of 2.375″ (60.3 mm), and ID of 1.939″ (49.25 mm). This is approximately 42% thicker than Schedule 40. See our SCH 80 seamless pipe product page for available sizes.

How much pressure can schedule 80 steel pipe hold?

At room temperature (100°F), carbon steel Schedule 80 pipe pressure ratings range from ~4,200 PSI for 1/2″ pipe to ~1,600 PSI for 10″ pipe. At 750°F, ratings decrease to ~55-60%. Always consult ASME B31.1/B31.3 for your specific application. For ASTM-standard SCH 80 pipe, see our ASTM SCH 80 carbon steel pipe.

What is the difference between SCH 80 and XS pipe?

For NPS 1/8″ through 8″, Schedule 80 and XS (Extra Strong) are identical — same wall thickness. For sizes 10″ and larger, XS has a slightly different specification.

Can you thread Schedule 80 pipe?

Yes — Schedule 80 pipe is ideal for threading. The thicker wall provides more material for NPT thread cutting without compromising integrity. Browse our schedule 80 steel pipes catalog for threaded options.

What is Schedule 80 pipe used for?

Schedule 80 pipe is specified for high-pressure, high-temperature, and safety-critical applications: steam systems, hydraulic oil lines, chemical processing, fire protection mains, compressed air, boilers, and offshore platforms. View our stainless steel SCH 80 pipes for corrosive environments.

How do I identify Schedule 80 pipe on-site?

1) Check for “SCH 80” or “XS” mill stencil. 2) Measure OD with calipers. 3) Measure wall thickness at pipe end. 4) Compare with dimensions chart above. ±12.5% mill tolerance is standard.

Does Schedule 80 carbon steel pipe rust?

Standard black carbon steel Schedule 80 pipe will rust when exposed to moisture. For corrosion protection, Sino East offers: 1) Hot-dip galvanized SCH 80 — see our galvanized pipe catalog, 2) Stainless steel SCH 80 — see 304 and 316 options, 3) Custom epoxy/paint coatings.

Disclaimer: Technical data is for general reference based on ANSI/ASME B36.10, B36.19, and B31.1. Actual specifications may vary. Consult a qualified engineer for critical applications.