Recommended application grade

Grade	Recommended application
ZY35 ZY35A	High hardness and good wear resistance.Used in the counting down two of finish rolling and reducing stands.
ZY34 ZY34A	Better wear resistance.Used in the stands counting down two of finish rolling and reducing stands.
ZY33 ZY33A	Moderate wear resistance and impact resistance.Used in the wear stands of finish rolling.
ZY31 ZY31A	Moderate wear resistance,good impact resistance.Used in the front stands of finish rolling.Also in the rear stands of finish rolling under unstable operation.
ZY30 ZY30A	Better toughness.Uesd in the first and second stands of finish rolling or reducing stands.Also in the rear stands of finish rolling under unstable operation.
ZY29 ZT29A	Good impact resistance.Used in the first and second stand of finish rolling,the last two stands of pre-finish rolling and the reducing stands as well.
ZY28 ZY28A	High binder content,good toughness and thermal cracking resistance.Used in the stands of prefinish rolling.Suitable for hot rolling thread steel.
ZY27 ZY27A	Good toughness and thermal cracking resistance.Used in the stands of prefinish rolling.Suitable for hot rolling thread steel.

Note:1.ZY series is suitable for cooling water with PH≤7.2;
2.ZY-A series is suitable for cooling water with PH≥7.2.