Meaning of seamless steel pipe steel stamp

Seamless steel pipes (SMLS) are essential materials used for fluid transportation and mechanical processing, widely applied in industries such as petroleum, natural gas, and chemicals. To ensure traceability and compliance, manufacturers engrave steel stamps onto the pipe surface, containing critical product information.

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Key Information in Seamless Steel Pipe Stamping

Steel stamps typically include the following details:

Manufacturer – The name, logo, or trademark of the producing company.
Product Standard – The applicable manufacturing standards, such as GB/T, ASTM/ASME, API 5L, etc.
Production Batch – The batch number assigned during production for traceability.
Specifications & Dimensions – Includes outer diameter, wall thickness, and length.
Steel Grade & Material – Specifies the composition and grade of the steel used.

Stamp Positioning on Seamless Steel Pipes

To maintain mechanical integrity, steel stamps are generally located at both ends or on the side of the pipe, positioned within 5%–10% of the wall thickness to avoid structural impact.

Stamp Placement:

Typically on the side of the pipe, though sometimes on the ends or bottom.

Stamping Methods:

Positive Engraving – Raised characters formed using engraving templates.

Negative Engraving – Recessed characters pressed into the steel surface.

Stamping Font & Color:

Uses Arabic numerals and English letters, with some instances of Chinese characters.

Commonly black, but may be red, blue, or other colors, depending on manufacturer-specific processing.

How to Identify a Seamless Steel Pipe Stamp?

Locate the stamp – Usually found at the pipe ends or along one side.
Read the information – Identify manufacturer, specifications, and production batch from the text or logo.
Verify details – If uncertain, refer to product standards or consult the manufacturer.

Conclusion

Steel stamping on seamless pipes serves as a crucial quality mark, ensuring that users can easily verify manufacturer, dimensions, material, and compliance details. Understanding stamp positioning and meaning helps buyers make informed purchases, while manufacturers must ensure clarity and accuracy to prevent user confusion.