varieties

Grade of steel

quality grade

specification mm

stock size mm

Standards

Bridge structure steel

Q235q

C,D,E

thickness 6-32

steekle mill:

thickness 6-8 

width 1600-3000  

 thickness >8-12

width 1600-3150   

thickness >12  

width 1600-3250   

length 4000-18000   

jobbing sheet-rolling mill:

thickness 6-25

width 1700-2450

thickness >25  

width 1500-2500 

length 4000-13000

GB/T 714-2008

Q370q

C(Z15,Z25,Z35),D(Z15,Z25,Z35),E(Z15,Z25,Z35)

Q345q

thickness 6-32

Q420q

C(Z15,Z25,Z35),D(Z15,Z25,Z35),E(Z15,Z25,Z35)

thickness 6-30

GB/T 714-2008

Bridge structure steel

Q235q

C,D,E

thickness 6-50

GB/T 714-2008

Q345q,Q370q

C(Z15,Z25,Z35),D(Z15,Z25,Z35),E(Z15,Z25,Z35)

thickness 6-40(among Q345qC,D thickness 6-50)

Q420q

GR345(GR50)

thickness 8-40

As the agreetment