High strength Q690qD Q690qE Q690qF bridge steel

Application of Q690qD Q690qE Q690qF bridge steel:
With the increasing number of railway bridge projects, highway bridge projects and sea crossing bridges, more and more bridge steel is used in bridge projects. Bridge steel has significant properties different from low alloy steel, such as fatigue resistance, low temperature toughness and atmospheric corrosion resistance.

Q690qD Q690qE Q690qF steel is the Q690q series bridge structural steel, and D, E and F are the quality grades of bridge steel, corresponding to -20℃, -40℃ and -60℃ respectively. From the quality grades, we can see that the environment for the use of bridge steel has very high technical requirements.

Q690qD Q690qE Q690qF bridge steel executive standard: GB/T 714 standard.

Q690qD Q690qE Q690qF bridge steel naming method:
Q - character of yield strength of bridge steel
690 - Min. yield strength value of bridge steel, different thickness has different requirements.
Q - character of bridge structure
D/E/F - Quality grade of bridge steel

If it is necessary to add Z-direction performance (thickness direction performance), the symbol representing thickness performance grade, Z15, Z25 or Z35 shall be added after the grade, such as Q690qD-Z15.

The Z-direction performance of Q690qD Q690qE Q690qF bridge steel shall comply with the GB/T 5313 standard. The performance grades of Z are: Q690qD-Z15, Q690qD-Z25, Q690qD-Z35, Q690qE-Z15, Q690qE-Z25, Q690qE-Z35, Q690qF-Z15, Q690qF-Z25, Q690qF-Z35.