ASTM A36 Seamless Carbon Steel Pipe is a seamless steel pipe made from A36-grade low-carbon structural steel, suitable for general structural applications such as building frames, bridge components and machinery manufacturing.
Product Description
ASTM A36 Seamless Carbon Steel Pipe is a carbon structural steel standard under ASTM, primarily covering steel plates, shapes and bars, not pipe products specifically. What the market calls "A36 seamless pipe" typically refers to seamless pipe produced to A36 chemistry and mechanical properties, usually supplied under pipe standards such as ASTM A53 or A500. The carbon content is generally no more than 0.26%, making it a typical low-carbon steel with good weldability and formability. Minimum yield strength is 250 MPa (36 ksi), and tensile strength is 400–550 MPa (58–80 ksi).
Chemical Composition
|
Element |
Content |
|
C (Carbon) |
≤0.26% |
|
Mn (Manganese) |
0.60–1.20% |
|
P (Phosphorus) |
≤0.040% |
|
S (Sulfur) |
≤0.050% |
|
Si (Silicon) |
≥0.10% |
|
Cu (Copper) |
≥0.20% (for copper-bearing steel) |
Mechanical Properties
|
Item |
Value |
|
Yield strength |
≥250 MPa (36 ksi) |
|
Tensile strength |
400–550 MPa (58–80 ksi) |
|
Elongation (200mm) |
≥20% |
|
Elongation (50mm) |
≥23% |
FAQ
Q: Is ASTM A36 a pipe standard?
A: No. ASTM A36/A36M is a carbon structural steel standard covering steel plates, shapes and bars, not pipe products. What is called "A36 steel pipe" in the market generally refers to pipe made from A36-grade material, actually supplied under pipe standards such as ASTM A53, A500 or A106.
Q: What applications is ASTM A36 Seamless Carbon Steel Pipe suitable for?
A: It is mainly used for structural applications such as building frames, bridge components, machinery manufacturing, pipe piles, support columns, handrails and platforms. It is not suitable for high-pressure, high-temperature or sour service, where pipe standards such as ASTM A106, A53 or API 5L should be specified.
Q: Can A36 and Q235B be used interchangeably?
A: The yield strength of A36 (250 MPa) is close to Q235B (235 MPa), and they are often treated as approximate equivalents in practice, interchangeable for general structural uses. However, the chemical composition and standard systems differ, and substitution in formal projects should be confirmed against design requirements and acceptance criteria.
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