Schedule 40 Carbon Steel Pipe – SCH 40 / STD Wall Thickness, Weight & Pressure Rating
ASC LLP, Mumbai, supplies Schedule 40 carbon steel pipe (SCH 40 / STD) in seamless and ERW construction. Grades include ASTM A106 Grade B, ASTM A53 Grade B, API 5L and A333 Grade 6, from ⅛” to 24″ NB, black, bare or galvanised, with EN 10204 3.1 certificates. Below you will find the full SCH 40 wall-thickness, weight and pressure-rating charts. See our full carbon steel range.
What is Schedule 40 Carbon Steel Pipe?
“Schedule” is the ASME B36.10M wall-thickness designation for steel pipe. Schedule 40 is the standard, most widely used wall thickness – thinner and lighter than Schedule 80 for the same nominal size, but strong enough for most water, air, gas, steam and process lines at moderate pressure. For example, 2″ SCH 40 has a 3.91 mm (0.154″) wall and weighs 5.44 kg/m, against 5.54 mm and 7.48 kg/m for SCH 80.
Schedule 40 Pipe – Quick Facts
- Dimension standard: ASME B36.10M (welded and seamless wrought steel pipe)
- Sizes: ⅛” – 24″ NB (10.3 – 609.6 mm OD)
- Grades: ASTM A106 B / C, A53 A / B, API 5L B / X42 – X70, A333 Gr 6
- Type: seamless (SMLS), ERW, LSAW for large sizes
- Ends & finish: plain, bevelled or threaded & coupled; black, bare or hot-dip galvanised
- Certificate: EN 10204 3.1; 3.2 / third-party inspection on request
Schedule 40 vs STD (Standard Weight) – Are They the Same?
Up to 10″ NB, Schedule 40 and STD (Standard) have the same wall thickness. From 12″ upwards they differ: STD stays at 9.53 mm (0.375″), while SCH 40 is thicker – 10.31 mm at 12″, 11.13 mm at 14″ and 12.70 mm at 16″. On large sizes, always state both the schedule and the wall thickness.
- Moderate pressure: suits most utility and process lines; choose SCH 80 for higher pressure or threaded high-pressure service.
- Lighter and cheaper: about 25 – 35% lighter than SCH 80 in the same size, with a larger bore.
- Easy to fabricate: readily cut, threaded, bent and welded with standard procedures.
- Corrosion protection: carbon steel is not corrosion-resistant – use galvanised, painted, coated or lined pipe where needed.
Types of Schedule 40 Pipe We Supply
- SCH 40 seamless pipe – ASTM A106 Gr B / A53 Type S / API 5L, for steam, process and pressure lines.
- SCH 40 ERW pipe – ASTM A53 Type E and API 5L ERW, economical for water, air, gas and structural use.
- SCH 40 galvanised pipe – A53 hot-dip galvanised for water, fire and outdoor service.
- SCH 40 low-temperature pipe – ASTM A333 Grade 6 for service down to −45 °C.
Need a heavier wall? See Schedule 80 carbon steel pipe.
Schedule 40 Pipe Wall Thickness & Weight Chart (ASME B36.10M)
| NPS | OD (mm) | Wall (mm) | Wall (in) | ID (mm) | Weight (kg/m) |
| ⅛” | 10.29 | 1.73 | 0.068 | 6.83 | 0.37 |
| ¼” | 13.72 | 2.24 | 0.088 | 9.24 | 0.63 |
| ⅜” | 17.15 | 2.31 | 0.091 | 12.53 | 0.85 |
| ½” | 21.34 | 2.77 | 0.109 | 15.80 | 1.27 |
| ¾” | 26.67 | 2.87 | 0.113 | 20.93 | 1.68 |
| 1″ | 33.40 | 3.38 | 0.133 | 26.64 | 2.50 |
| 1¼” | 42.16 | 3.56 | 0.140 | 35.04 | 3.39 |
| 1½” | 48.26 | 3.68 | 0.145 | 40.90 | 4.05 |
| 2″ | 60.33 | 3.91 | 0.154 | 52.51 | 5.44 |
| 2½” | 73.03 | 5.16 | 0.203 | 62.71 | 8.64 |
| 3″ | 88.90 | 5.49 | 0.216 | 77.92 | 11.29 |
| 4″ | 114.30 | 6.02 | 0.237 | 102.26 | 16.07 |
| 5″ | 141.30 | 6.55 | 0.258 | 128.20 | 21.77 |
| 6″ | 168.28 | 7.11 | 0.280 | 154.06 | 28.26 |
| 8″ | 219.08 | 8.18 | 0.322 | 202.72 | 42.54 |
| 10″ | 273.05 | 9.27 | 0.365 | 254.51 | 60.30 |
| 12″ | 323.85 | 10.31 | 0.406 | 303.23 | 79.72 |
| 14″ | 355.60 | 11.13 | 0.438 | 333.34 | 94.55 |
| 16″ | 406.40 | 12.70 | 0.500 | 381.00 | 123.30 |
| 18″ | 457.20 | 14.27 | 0.562 | 428.66 | 155.87 |
| 20″ | 508.00 | 15.09 | 0.594 | 477.82 | 183.42 |
| 24″ | 609.60 | 17.48 | 0.688 | 574.64 | 255.24 |
Plain-end weights for carbon steel (7.85 g/cm³). STD wall equals SCH 40 up to 10″; STD is 9.53 mm for 12″ and larger.
Schedule 40 Pipe Pressure Rating – ASTM A106 Grade B
| NPS | Wall (mm) | Approx. max. pressure (MPa) | Approx. max. pressure (psi) |
| ½” | 2.77 | 34.5 | 5,000 |
| ¾” | 2.87 | 28.1 | 4,070 |
| 1″ | 3.38 | 26.3 | 3,810 |
| 1¼” | 3.56 | 21.7 | 3,140 |
| 1½” | 3.68 | 19.4 | 2,820 |
| 2″ | 3.91 | 16.4 | 2,380 |
| 2½” | 5.16 | 17.9 | 2,600 |
| 3″ | 5.49 | 15.6 | 2,260 |
| 4″ | 6.02 | 13.2 | 1,910 |
| 5″ | 6.55 | 11.6 | 1,680 |
| 6″ | 7.11 | 10.5 | 1,520 |
| 8″ | 8.18 | 9.3 | 1,340 |
| 10″ | 9.27 | 8.4 | 1,220 |
| 12″ | 10.31 | 7.9 | 1,140 |
| 14″ | 11.13 | 7.7 | 1,120 |
| 16″ | 12.70 | 7.7 | 1,120 |
| 18″ | 14.27 | 7.7 | 1,120 |
| 20″ | 15.09 | 7.3 | 1,060 |
| 24″ | 17.48 | 7.1 | 1,020 |
Basis: ASME B31.3 straight-pipe formula P = 2SEt / (D − 2Yt), with S = 137.9 MPa (20 ksi, A106 Gr B up to about 204 °C / 400 °F), E = 1.0 (seamless), Y = 0.4, wall reduced by 12.5% mill tolerance, plain-end pipe, no corrosion allowance. Ratings fall at higher temperatures, for ERW pipe (lower E), when a corrosion allowance is added, and for threaded pipe (subtract thread depth). These are guide values only – the design must be checked by the piping engineer.
Schedule 40 Carbon Steel Pipe Specifications
| Item | Details |
| Dimensions | ASME B36.10M, Schedule 40 / STD |
| Seamless grades | ASTM A106 Gr B / C, A53 Type S Gr B, API 5L Gr B – X70, A333 Gr 6 |
| Welded grades | ASTM A53 Type E Gr A / B, API 5L ERW / LSAW |
| Size range | ⅛” – 24″ NB |
| Length | Single random (5 – 7 m), double random (11 – 13 m), cut lengths |
| Ends | Plain end, bevelled end (30° ±5°), threaded & coupled |
| Coating | Black varnish, bare, hot-dip galvanised, 3LPE / FBE on request |
| Testing | Hydrostatic, NDT (UT / eddy current), tensile, flattening, bend |
Chemical Composition – ASTM A106 Gr B & A53 Gr B
| Element | ASTM A106 Gr B (%) | ASTM A53 Gr B (%) |
| Carbon (C) | 0.30 max | 0.30 max |
| Manganese (Mn) | 0.29 – 1.06 | 1.20 max |
| Phosphorus (P) | 0.035 max | 0.05 max |
| Sulphur (S) | 0.035 max | 0.045 max |
| Silicon (Si) | 0.10 min | – |
| Cu / Ni / Cr (each) | 0.40 max | 0.40 max |
| Molybdenum (Mo) | 0.15 max | 0.15 max |
| Vanadium (V) | 0.08 max | 0.08 max |
Mechanical & Physical Properties
| Property | ASTM A106 Gr B / A53 Gr B |
| Tensile strength, min | 415 MPa (60 ksi) |
| Yield strength, min | 240 MPa (35 ksi) |
| Density | 7.85 g/cm³ |
| Modulus of elasticity | ≈ 200 GPa |
| Thermal conductivity | ≈ 50 W/m·K |
Schedule 40 vs Schedule 80 Pipe
| NPS | SCH 40 wall (mm) | SCH 80 wall (mm) | SCH 40 weight (kg/m) | SCH 80 weight (kg/m) | SCH 40 / SCH 80 pressure (psi, approx.) |
| ½” | 2.77 | 3.73 | 1.27 | 1.62 | 5,000 / 6,970 |
| 1″ | 3.38 | 4.55 | 2.50 | 3.24 | 3,810 / 5,270 |
| 2″ | 3.91 | 5.54 | 5.44 | 7.48 | 2,380 / 3,430 |
| 4″ | 6.02 | 8.56 | 16.07 | 22.32 | 1,910 / 2,770 |
| 6″ | 7.11 | 10.97 | 28.26 | 42.56 | 1,520 / 2,390 |
| 8″ | 8.18 | 12.70 | 42.55 | 64.63 | 1,340 / 2,110 |
Same pressure basis as above. Full Schedule 80 data: Schedule 80 carbon steel pipe. Typical uses of SCH 40: water and fire mains, compressed air, low-pressure steam and condensate, gas distribution, process utilities, HVAC and structural tube.
Why Choose ASC LLP for Schedule 40 Pipe?
- Correct grade and paperwork: SCH 40 pipe certified to ASTM A106 / A53 / API 5L / A333 with EN 10204 3.1 certificates.
- Full size range: ⅛” – 24″ NB, seamless and welded, black or galvanised, cut lengths and threaded ends.
- Matching fittings: A106 Gr B fittings and A53 Gr B fittings in SCH 40.
- Export packing with bevel protectors, end caps and bundling.
Send size, grade, schedule, length and quantity to sales@amardeepsteel.com, call 022-67439130 or contact us.
Frequently Asked Questions – Schedule 40 Carbon Steel Pipe
How thick is Schedule 40 pipe?
Schedule 40 wall thickness depends on pipe size. For example, ½” SCH 40 is 2.77 mm (0.109″), 1″ is 3.38 mm (0.133″), 2″ is 3.91 mm (0.154″), 4″ is 6.02 mm (0.237″) and 6″ is 7.11 mm (0.280″), per ASME B36.10M.
What is the pressure rating of Schedule 40 carbon steel pipe?
For ASTM A106 Grade B seamless pipe at up to about 204 °C, using the ASME B31.3 formula with 12.5% mill tolerance and no corrosion allowance, approximate ratings are 5,000 psi for ½”, 2,380 psi for 2″, 1,910 psi for 4″ and 1,520 psi for 6″. Ratings are lower at higher temperature, for welded pipe and for threaded pipe.
Is Schedule 40 the same as STD (Standard)?
Yes up to 10″ NB – SCH 40 and STD have the same wall thickness. From 12″ upwards STD stays at 9.53 mm (0.375″), while SCH 40 is thicker (10.31 mm at 12″, 12.70 mm at 16″).
What is the difference between Schedule 40 and Schedule 80 pipe?
Both have the same outside diameter, but Schedule 80 has a thicker wall, a smaller bore, more weight and a higher pressure rating. For example, 2″ SCH 40 has a 3.91 mm wall and 5.44 kg/m weight, while 2″ SCH 80 has a 5.54 mm wall and 7.48 kg/m.
What is the weight of Schedule 40 pipe?
Plain-end carbon steel SCH 40 pipe weighs about 1.27 kg/m at ½”, 2.50 kg/m at 1″, 5.44 kg/m at 2″, 16.07 kg/m at 4″, 28.26 kg/m at 6″ and 42.55 kg/m at 8″.
Which grades are available in Schedule 40?
Schedule 40 carbon steel pipe is commonly supplied in ASTM A106 Grade B (seamless), ASTM A53 Grade A / B (seamless, ERW or galvanised), API 5L, and ASTM A333 Grade 6 for low temperature.
Global Reach
ASC LLP supplies carbon steel pipe, fittings and flanges to customers in the USA, Europe, the Middle East and Asia, with secure packing and full documentation. Buyers worldwide rely on our Schedule 40 carbon steel pipes for certified material and traceability.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
