● Order special steel of end cover from excellent steel works (Tai Steel,Wu Steel and Pu Steel) in accordance with Beihai Steel works's special technical requirements for end cover materials.
● Main specification which is better than national standard:
Carbon steel: Phosphorus P≤0.020% 、 Sulphur S≤0.015% 、 Stiffness ratio:бs/бb ≤ 75%
������� UT: larger than 12mm ; Normalizing: larger than 16mm ; 3m width plate: larger than 10mm .
0Cr18Ni9;carbon content C ≤ 0.06%