ASTM A36 Seamless Carbon Steel Pipe
A36 Carbon Steel Press Pipe
ASTM A36 (specified by ASTM A36/A36M) is a low-carbon structural steel used to manufacture welded and bolted structures in industrial and civil buildings, bridge construction, and general engineering. A36 seamless carbon steel pipe is produced by the seamless process (hot-rolled or cold-drawn) and is widely used in structural frameworks, supports, and fabrications where moderate strength and good ductility are required.
Although ASTM A36 is written primarily for plates, shapes, and bars, it is also supplied in pipe form. In practice, the pipe is manufactured to a pipe specification such as ASTM A53 or ASTM A500 while being ordered to A36 chemistry and mechanical properties-which is why buyers commonly search for "ASTM A36 seamless pipe" even though A36 itself is a material grade rather than a pipe product-form standard.
ASTM A36 seamless carbon steel pipe offers good welding performance and is frequently compared with Q235 (Chinese GB/T 700), its approximate equivalent. While A36 and Q235 differ slightly in tensile and yield values, they are commonly used for the same structural purposes.
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ASTM A36 pipe carbon steel seamless Chemical Composition
Typical maximum percentages for A36-grade steel. Exact limits follow ASTM A36/A36M; manganese range varies by product form.
| Standard | Grade | Process | Chemical Composition % | |||||
|---|---|---|---|---|---|---|---|---|
| C max | Mn max | P max | S max | Si min | Cu max | |||
| ASTM A36 | B | SMLS | 0.26 | 0.60-1.20 | 0.040 | 0.050 | 0.40 | 0.20 |
ASTM A36 seamless carbon pipe Mechanical Properties
| Product |
Tensile strength, MPa |
Yield point, MPa | Elongation (in 200 mm) | Elongation (in 50 mm) |
| pipes | 400-550 (58–80 ksi) | 250 (36 ksi) | ≥ 20% | ≥ 23% |
ASTM A36 Seamless Carbon Steel Pipe Specifications
- Material standard: ASTM A36 / A36M (steel grade)
- Pipe standard: Typically ASTM A53 or ASTM A500 (pipe form); API 5L / A106 for pressure service
- Grade: A36 (minimum yield 250 MPa / 36 ksi)
- Manufacturing process: Seamless (hot-rolled, cold-drawn)
- Outside diameter: 21.3–660 mm (1/2 in – 26 in NB)
- Wall thickness: 2.0–40 mm (Schedule 10 through Schedule XXS)
- Length: 6 m, 12 m, or custom-cut to requirement
- Ends: Plain End (PE), Beveled End (BE), threaded and coupled
- Surface finish: Black, painted, pre-galvanized (60–150 g/m²), or hot-dip galvanized (200–400 g/m²)
- Inspection: ISO 9001, third-party (SGS / BV), Mill Test Certificate (EN 10204 3.1)
ASTM A36 Seamless Carbon Steel Pipe Applications
ASTM A36 seamless pipe is engineered for structural and general engineering service rather than high-pressure fluid transmission:
- Building and structural frames
- Bridge components and highway structures
- Machinery and equipment frames
- General fabrication and welded structures
- Handrails, staircases, platforms, and pipe racks
- Piling and support columns
For high-pressure hydrocarbon, steam, or boiler service, use ASTM A106 / A53 or API 5L line pipe instead of A36.
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A36 Pipe Packaging and shipping
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FAQ
What is ASTM A36 seamless carbon steel pipe?
It is structural pipe made from A36-grade low-carbon steel, the most widely used structural steel in the United States. It is supplied to a minimum yield strength of 250 MPa (36 ksi) and an ultimate tensile strength of 400–550 MPa (58–80 ksi), and is valued for weldability, formability, and low cost in building, bridge, and general structural applications.
Is ASTM A36 a pipe standard?
No. ASTM A36/A36M defines a steel grade (its chemistry and mechanical properties), not a pipe product form. When buyers ask for A36 pipe, the pipe is usually manufactured as seamless pipe to ASTM A53 or ASTM A106, or as structural hollow section to ASTM A500, while meeting A36 chemistry and strength requirements.
What is the difference between A36, A53, and A106 pipe?
A36 is a structural steel grade defined by strength (yield 250 MPa). A53 covers welded and seamless pipe for general service, and A106 covers seamless pipe for high-temperature service. A36 pipe is typically produced to A53 or A106 dimensions but ordered to A36 properties. For high-pressure oil and gas transmission, API 5L line pipe is used instead.
How does ASTM A36 compare with Q235?
Q235 (GB/T 700) is the approximate Chinese equivalent of A36. A36 has a minimum yield of 250 MPa (36 ksi) and tensile of 400–550 MPa; Q235 has a yield of 235 MPa and tensile of 370–500 MPa. They are broadly comparable and are often used for the same structural purposes.
What sizes are available for A36 seamless pipe?
Outside diameter typically ranges from 21.3 mm to 660 mm (1/2 in to 26 in NB), with wall thickness from about 2.0 mm to 40 mm (Schedule 10 through Schedule XXS). Standard lengths are 6 m and 12 m, with custom-cut lengths available.
Can ASTM A36 seamless pipe be galvanized?
Yes. A36 pipe is well suited to hot-dip galvanizing and pre-galvanizing, which improve corrosion resistance for outdoor and structural use. Typical zinc coatings are 60–150 g/m² for pre-galvanized pipe and 200–400 g/m² for hot-dip galvanized pipe.
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