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GB/T714 Q420qDNH grade steel plate

GB/T714 Q420qDNH steel is a Chinese structural steel grade. It is specially used to build various steel structure bridges (railroad, highway, cross-water, and cross-sea). Q420qDNH material has high strength, toughness, and load and impact performance of rolling stock. In addition, Q420qDNH steel plate has good fatigue resistance, certain low temperature toughness and atmospheric corrosion resistance.

Q420qDNH mechanical properties


Tensile requirement

Impact test

Yield strength ReL/MPa

Tensile strength Rm/MPa

Elongation A/%

temperature

Shock absorption energy, KV2/J

Thick≤50mm

Thick50mm-100mm

Thick100mm-150mm

Min.

 

Min.

420

410

---

540

19

-20

120

420

410

---

540

19

-40

120

420

410

---

540

19

-60

47

At present, with the rapid development of the domestic steel industry and the increasing application of bridge steel, there is an urgent need to accelerate the promotion and application of high-performance bridge steel to meet the needs of modern steel bridge manufacturing. Bridge steel will also be further developed.

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