ASTM A120 Carbon Steel Pipes – A53 Equivalent, Black & Galvanized
Is ASTM A120 still valid?
No. ASTM A120 covered black and hot-dip galvanized welded and seamless steel pipe for ordinary uses – water, gas, air and low-pressure steam. ASTM discontinued it in 1987 and replaced it with ASTM A53. Pipe ordered as “A120” today is supplied to ASTM A53 Type F, E or S, Grade A or B, which adds tensile, bend, flattening and hydrostatic test requirements that A120 did not have.
ASTM A120 Pipe – Quick Facts
- Status: discontinued (1987); replaced by ASTM A53 / ASME SA53
- Modern equivalent: A53 Type F (furnace-butt-welded), Type E (ERW) or Type S (seamless), Grade A or B
- Finish: black (bare or varnished) or hot-dip galvanized
- Sizes: NPS ⅛” to 26″ to ASME B36.10, standard (STD), extra-strong (XS) and XXS weights
- Certificate: EN 10204 3.1; dual marking to old drawings on request
ASC LLP, Mumbai, supplies black and galvanized pipe to A53 for projects and drawings that still call for A120. See our full range of carbon steel welded pipes and seamless pipes.
ASTM A120 vs ASTM A53 – What Changed?
| Item | ASTM A120 (discontinued) | ASTM A53 (current) |
| Status | Discontinued 1987 | Active – ASTM A53/A53M, ASME SA53 |
| Intended use | Ordinary uses – water, gas, air, low-pressure steam | Mechanical and pressure applications, ordinary uses, steam, water, gas, air |
| Types | Welded and seamless | Type F (furnace-butt-welded), Type E (ERW), Type S (seamless) |
| Grades | No strength grades | Grade A and Grade B |
| Tensile testing | Not required | Required (Grade A 330 MPa, Grade B 415 MPa min) |
| Other tests | Hydrostatic test | Hydrostatic, bend, flattening; NDE on Type E welds |
| Galvanizing | Hot-dip galvanized option | Hot-dip galvanized, 0.55 kg/m² (1.8 oz/ft²) average minimum zinc |
Because A53 includes everything A120 covered plus strength testing, A53 pipe can be used wherever an old A120 drawing applies. For high-temperature service, use ASTM A106 Grade B seamless pipe instead.
Where A120-Type Pipe Is Used Today
- Water distribution – potable and process water in buildings and plants (galvanized).
- Fire protection – sprinkler and fire-water mains.
- Compressed air and gas – low-pressure utility lines.
- Low-pressure steam and condensate – heating systems.
- Structural & mechanical – handrails, fencing, scaffolding tube and general fabrication.
Order A53 Grade B for most new work; Grade A is softer and used where pipe is coiled or close-bent.
A120 / A53 Pipe Sizes & Wall Thickness (ASME B36.10)
| NPS | OD (in / mm) | SCH 10 wall (in) | SCH 40 / STD wall (in) | SCH 80 / XS wall (in) |
| ½” | 0.840 / 21.3 | 0.083 | 0.109 | 0.147 |
| ¾” | 1.050 / 26.7 | 0.083 | 0.113 | 0.154 |
| 1″ | 1.315 / 33.4 | 0.109 | 0.133 | 0.179 |
| 1½” | 1.900 / 48.3 | 0.109 | 0.145 | 0.200 |
| 2″ | 2.375 / 60.3 | 0.109 | 0.154 | 0.218 |
| 3″ | 3.500 / 88.9 | 0.120 | 0.216 | 0.300 |
| 4″ | 4.500 / 114.3 | 0.120 | 0.237 | 0.337 |
| 6″ | 6.625 / 168.3 | 0.134 | 0.280 | 0.432 |
| 8″ | 8.625 / 219.1 | 0.148 | 0.322 | 0.500 |
Larger sizes up to NPS 26, and XXS walls, are supplied to ASME B36.10. Type F pipe is normally limited to the smaller sizes.
Mechanical Properties – ASTM A53 (A120 Replacement)
| Property | Grade A | Grade B |
| Tensile strength, min | 330 MPa (48 ksi) | 415 MPa (60 ksi) |
| Yield strength, min | 205 MPa (30 ksi) | 240 MPa (35 ksi) |
| Elongation | Per ASTM A53 formula (depends on wall and specimen) | Per ASTM A53 formula (depends on wall and specimen) |
ASTM A120 Pipe Specifications
| Item | Details |
| Product | ASTM A120 carbon steel pipe – supplied to ASTM A53 |
| Current standard | ASTM A53 / ASME SA53, Type F, E or S, Grade A or B |
| Dimensions | ASME B36.10M |
| Size range | NPS ⅛” to 26″ |
| Wall | SCH 10, 20, 40, STD, 80, XS, 160, XXS |
| Finish | Black (bare / varnished) or hot-dip galvanized |
| Ends | Plain, bevelled, threaded & coupled |
| Length | Single random, double random, cut lengths |
| Testing | Hydrostatic, tensile, bend, flattening, NDE (Type E) |
| Certificate | EN 10204 3.1; third-party inspection on request |
Chemical Composition – ASTM A53 (A120 Replacement)
| Element (max %) | Type S / E – Grade A | Type S / E – Grade B | Type F – Grade A |
| Carbon (C) | 0.25 | 0.30 | 0.30 |
| Manganese (Mn) | 0.95 | 1.20 | 1.20 |
| Phosphorus (P) | 0.05 | 0.05 | 0.05 |
| Sulphur (S) | 0.045 | 0.045 | 0.045 |
| Copper (Cu) | 0.40 | 0.40 | 0.40 |
| Nickel (Ni) | 0.40 | 0.40 | 0.40 |
| Chromium (Cr) | 0.40 | 0.40 | 0.40 |
| Molybdenum (Mo) | 0.15 | 0.15 | 0.15 |
| Vanadium (V) | 0.08 | 0.08 | 0.08 |
The total of Cu, Ni, Cr, Mo and V must not exceed 1.00%. A120 itself did not set full chemistry limits – one reason it was replaced by A53.
Physical Properties of Carbon Steel Pipe
| Property | Value (approx.) |
| Density | 7.85 g/cm³ |
| Modulus of elasticity | ≈ 200 GPa |
| Thermal conductivity | ≈ 50 W/m·K |
| Coefficient of thermal expansion | ≈ 11.7 µm/m·°C |
Applications of A120 / A53 Pipes
| Industry | Typical uses |
| Buildings & utilities | Water supply, plumbing risers, fire sprinkler lines |
| Industrial plants | Compressed air, nitrogen, cooling water, low-pressure steam |
| Gas distribution | Low-pressure fuel gas lines inside plants and buildings |
| Construction | Handrails, scaffolding, fencing and structural tube |
| Agriculture | Irrigation and water-well casing (galvanized) |
Why Buy A120 / A53 Pipes from ASC LLP?
- Correct modern spec: pipe supplied to ASTM A53 with tensile and hydrostatic results – accepted wherever A120 is called for.
- Black or galvanized: hot-dip galvanized to the A53 zinc-coating requirement.
- Full system: A53 Grade B fittings, carbon steel flanges and fittings in one order.
- Inspection: third-party inspection and EN 10204 3.1 certificates.
- Export packing in bundles with end caps; regular shipments worldwide.
Send size, schedule, type (F/E/S), finish and quantity to sales@amardeepsteel.com or contact us.
Frequently Asked Questions – ASTM A120 Pipes
Is ASTM A120 still an active standard?
No. ASTM A120, which covered black and hot-dip galvanized welded and seamless steel pipe for ordinary uses, was discontinued in 1987 and replaced by ASTM A53.
What is the equivalent of ASTM A120 pipe?
The modern equivalent is ASTM A53 / ASME SA53 pipe – Type F (furnace-butt-welded), Type E (ERW) or Type S (seamless), in Grade A or Grade B, black or hot-dip galvanized.
What is the difference between ASTM A120 and A53?
A120 had no strength grades and did not require tensile testing. A53 adds Grade A and Grade B with minimum tensile strengths of 330 MPa and 415 MPa, plus bend, flattening, hydrostatic and weld NDE tests.
Is there an ASME SA120 specification?
No. ASME adopted A53 as SA53 but never published an SA120 specification. For code work, specify ASTM A53 / ASME SA53.
Can A53 pipe be used where A120 is specified?
Yes. A53 covers the same black and galvanized pipe for ordinary uses and adds mechanical testing, so it meets or exceeds A120 requirements. Confirm with the engineer if the drawing is for code-stamped work.
Global Reach
ASC LLP supplies carbon steel pipes, fittings and flanges to building, utility and industrial projects worldwide, with prompt delivery and full documentation. Buyers in the USA, Europe, the Middle East and Asia rely on our ASTM A120 / A53 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.
