Q310GNH weathering structural steel

Q310GNH weathering structural steel description
Grade: Q310GNH
Standard: GB/T 3077-2015
Product name: Weather-resistant structural steel
 

Q310GNH chemical composition:

C: 0.17～0.24
Si: 0.17～0.37
Mn: 0.40～0.70
S : ≤0.035
P: ≤0.035
Cr: 0.80～1.10
Ni: ≤0.030
Cu: ≤0.030
Mo: 0.15～0.25
 
Mechanical properties:
Tensile strength σb (MPa): ≥885(90)
Yield strength σs (MPa): ≥685(70)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥50
Impact energy Akv (J): ≥78
 
Q310GNH delivery status: delivery with heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment, the delivery status should be indicated in the warranty book.

Q310GNH weathering steel plate is more popular. The important problem is that these application technologies need to be developed. In order to use its results, it requires appropriate technology and skills. For the corrosion resistance of low-alloy corrosion-resistant steel, there are different detailed regulations according to the purpose of use. Use weathering steel in a bare state for bridges. For example, for the durability required for a 50-year bridge, because weathering steel does not specify the allowable degree of corrosion, the strength design needs to meet the 50-year corrosion thickness reduction of less than 0.2-0.3mm Claim.