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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Carbon steel seamless pipe specifications include the governing standard, material grade, NPS/DN, outside diameter (OD), wall thickness (WT), and length.
Common standards for carbon steel seamless pipe include ASTM A53, ASTM A106, and API 5L. The applicable grade and requirements depend on the intended service and project specification.
Common Steel Pipe Standards — Grades and Applications
| Standard | Common Grades | Main Applications |
|---|---|---|
| ASTM A53 | Grade A, Grade B | General pressure, mechanical and utility piping |
| ASTM A106 | Grade B, Grade C | High-temperature process and steam piping |
| API 5L | Grade B, X42 – X70 | Oil and gas transmission pipelines |
Key Specification Points:
ASTM A106: Designed for seamless carbon steel piping where elevated-temperature service is required; Grade B is widely specified.
API 5L: Used for line pipe in pipeline transportation. PSL1 and PSL2 define different levels of product requirements, with PSL2 adding tighter requirements for areas such as chemical composition, mechanical properties, testing, and traceability.
Carbon steel seamless pipe dimensions are specified by nominal size, outside diameter, wall thickness, Schedule, and length. Available dimensions vary by the applicable standard, grade, and project specification.
Carbon Steel Pipe — Dimensional Parameters
| Dimensional Parameter | Range / Options |
|---|---|
| Outside Diameter (OD) | 21.3 – 914.4 mm |
| Wall Thickness (WT) | 2.11 – 60 mm |
| Schedule | SCH 10, 20, 40, 80, 160, XXS |
| Common Lengths | 5.8 m, 6 m, 11.8 m, 12 m; custom lengths |
For detailed NPS, OD, Schedule and wall thickness values, see [Seamless Steel Pipe Size Chart].
A complete carbon steel seamless pipe specification combines the standard and grade with the pipe dimensions, typically expressed as OD × WT × length.
Example Product Specification
| Specification | Value |
|---|---|
| Standard & Grade | ASTM A106 Gr. B |
| Outside Diameter | 219.1 mm |
| Wall Thickness | 8.18 mm |
| Length | 12 m |
The same dimensional specification can also be expressed using NPS and Schedule:
ASTM A106 Gr. B, NPS 8 SCH 40, 12 m
Under ASME B36.10M, NPS 8 has an OD of 219.1 mm, while NPS 8 SCH 40 has a wall thickness of 8.18 mm.
Seamless Steel Pipe Size Chart
Carbon Steel Pipe Schedule Chart
E-mail: sales@eastern-steels.com
