... )steel strip:HR AND GI STRIP 2)Q195,Q215,Q235,Q345 3)zinc coating mass:60g-275g 4)used for c/z purlin ... ,pip,steel billet Steel strip of our comapny including the hr strip ... often use our own strip to produce the c/z purlin for our construction.steel grade: Q195,Q215,Q235,Q255,Q345 AND SOME ...