1170 28Mn6 steel with middle carbon content and the hardness of 249 Brinell scale
On the Brinell Scale
of increasing hardness from 200 BHN A-R steel through 800 BHN cast iron, the pipe's inner surface at 600 BHN can withstand most common abrasives and tapers to a 250 BHN outer surface able to accommodate handling, installation and maintenance.
By this graph, pure lead will rate a "0" on the Saeco scale and correspond to a "3" to "5" on the Brinell scale
The process of ongoing improvement is also true for SSAB, and Yalcin notes that when the steel producer started out with Hardox, it had a hardness of 400 on the Brinell scale
- but as research and development have continued that upper value has risen - to 600 and even to 700 today with Hardox Extreme.
The system is capable of measuring all Rockwell, Rockwell Superficial, Vickers and Brinell scales
, and is said to meet or exceed all major industry standard requirements, including those for ASTM, ISO and Direct NIST traceability, according to the manufacturer.