About Us
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.
Product Category
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
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.
Roughness of carbon steel pipe
The roughness of carbon steel pipe depends on the smoothness of its surface. Common roughnesses include Ra, Rz and Rmax, generally between Ra 1.6-6.3 microns.
Concept and measurement method of roughness of carbon steel pipe
Common carbon steel pipe roughness
1.Ra value
The Ra value is the contour area value of the geometric mean line on the surface of the pipe. It is expressed in microns (μm) as a non-directional comprehensive surface roughness index. It is calculated by taking the average distance difference between all points on the surface of the pipe and its corresponding datum plane, which is generally between 1.6-6.3μm.
2. Rz value
The Rz value is the average dispersion between the peaks and valleys of any five adjacent sections along the length of the pipe, expressed in microns. It is measured along the length of the pipe and reflects more of the longitudinal direction of the pipe surface. Uneven conditions. The Rz value of carbon steel pipe is generally between 10-50μm.
3. Rmax value
E-mail: sales@eastern-steels.com
