Q355NH steel plate under China GB/T 4171 standard, it is a kind of weathering steel. Q355NH weathering steel plate is the high tensile strength weathering steel plate, it has 490-630 Mpa tensile strength. More information about Q355NH weathering steel technology, please see the following:

Q355NH steel plate comprehensive performance: Q355NH steel plate has good weldability and low temperature impact toughness, suitable for architecture, artifacts such as weather resistance of weldments.

Q355NHB steel is quality grade B of Q355NH weather-resistant steel sheet What is the difference between the element composition and tensile requirement of weather-resistant steel plate Q355NHB compared to A588 steel plate?

Q355NH weathering steel features

Q355NHB weathering steel plate characteristics: It has the characteristics of high-quality steel such as toughness, plastic extension, forming, welding and cutting, abrasion, high temperature and fatigue. Q355NHB steel plate is atmospheric corrosion-resistant steel plate, also known as weather-resistant steel plate. It is a low alloy steel series between general steel and stainless steel. Weather-resistant steel is made of ordinary carbon steel with a few corrosion-resistant elements such as copper and nickel. Toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance, etc.

Chemical composition(mass fraction)(wt.%) of the Q355NH

Element	Data
C(％)	Max 0.16
Si(％)	Max 0.50
Mn(％)	0.90-1.50
P(％)	0.035
S(％)	0.035
Cr(％)	0.40-0.80
V(%)	0.02-0.10
Cu(%)	0.20-0.50

Mechanical properties of steel grade Q355NH

Properties	Data
Yield Rp0.2 (MPa)	745 (≥)
Tensile Rm (MPa)	333 (≥)
Impact KV/Ku (J)	11
Elongation A (%)	23
Reduction in cross section on fracture Z (%)	24
As-Heat-Treated Condition	Solution and Aging, Annealing, Ausaging, Q+T,etc
Brinell hardness (HBW)	242

Q355NH steel plate has the characteristics of high-quality steel for toughness, plastic elongation, forming, welding, abrasion, high temperature and fatigue resistance.