Surface quality classes
For the delivery of hot rolled bars applies the DIN EN ISO 9443 . Acc. to part 4.2 "designation" the requirements of the surface condition has to be mentioned in the order. Due to the technical limits of manufacturing and test methods the permissible part of incorrect products in the entire delivery unit must be fixed.
If the order as well as the applicable specification do not contain such a definition, SAH confirms “technical crack free”, if material is ordered with 100% crack testing.
If 100 % crack tested material is ordered, the incorrect part of a delivery (minimum 5 tons) for rolled steel can amount a maximum of 1000 ppm.
For deliveries of bright steel the definitions of the EN 10277-1 applies. The surface quality classes are fixed there.
If the order as well as the applicable specification contains formulations in the sense of: "be free of cracks" or "no surface defects allowed", then SAH confirms surface quality class 4 according to EN 10277-1 "manufactured technically crack free".
If 100 % crack tested material is ordered, the incorrect part of a delivery (minimum 5 tons) for bright steel can amount a maximum of 500 ppm.