Q345NQR2 grade is a kind of weathering steel (that is, atmospheric corrosion resistant steel. It is used in sulfur-containing flue gas, air preheater, economizer, boiler air preheater, to prevent acid dew point, etc.). Q345NQR2 belongs to Low-temperature weathering steel, which has relatively strong resistance to low-temperature corrosion.
Standard: TB1979-2014
Grade: Q345NQR2
Category: atmospheric corrosion resisting steel for railway rolling stock
Equivalent: 09CuPCrNi-A hot rolled, JIS SPA-H
Size: Thickness: 1.6mm-60mm, Width: 1000mm-4200mm, Length: 3000mm-18000mm
Chemical composition of Q345NQR2 steel
Grade |
C |
Si |
Mn |
P |
S |
Cu |
Cr |
Ni |
|
Q345NQR2 |
≤0.12 |
0.25-0.75 |
0.20-0.50 |
0.060-0.12 |
≤0.020 |
0.25-0.50 |
0.30-1.25 |
0.12-0.65 |
Mechanical properties
Grade |
Thick, mm |
Yield strength, MPa |
Tensile strength, MPa |
Flexion ratio |
Elongation, A% |
180°Bend test |
|
Q345NQR2 |
≤6 |
≥345 |
≥480 |
≤0.75 |
≥24 |
D=a |
|
>6 |
D=2a |
Delivery status: delivered in hot-rolled or annealed state after hot-rolling. According to the agreement between the supplier and the buyer, the hot-rolled steel plate can be delivered after pickling; when the steel plate is delivered in the flat state, the four sides of the steel plate should be cut neatly and at right angles.
Scope of application
Q345NQR2 steel plate is outdoor steel for containers, power plant chimneys, railway projects, such as steel for large outdoor sculptures. Weathering steel (that is, atmospheric corrosion resistant steel) is a low-alloy steel series between ordinary steel and stainless steel at a low price and good quality.
