Q355GNHA steel chemical composition

The raw material of Q355GNHA is weathering steel. By adding a small amount of alloying elements such as Cu, P, Cr, Ni, etc., it forms a maintenance layer on the basic surface of the Q355GNHA metal to improve the steel with atmospheric corrosion resistance. The name of Q355GNHA consists of the lower limit of yield strength and quality grades (A, B, C, D, E) of the Chinese pinyin letters "Q", "GNH", "NH" of "yield strength", "high weather resistance" or "weather resistance" )composition.
 

Q355GNHA steel chemical composition(%)

C: ≤0.12;
Si: 0.20~0.75;
Mn: ≤1.00;
P: 0.07~0.15;
S: ≤0.02;
Ni: ≤0.65;
Cr: 0.30~1.25;
Mo: ≤0.30;
Cu: 0.25~0.55;
Nb: 0.015~0.06;
V: 0.02~0.12;
Ti: 0.02~0.10;
Alt: ≥0.02;
Zr: ≤0.15;
 
Q355GNHA plates manufacturing method and delivery status
The Q355GNHA steel is tempered by converter or electric furnace, and it is killed steel. Hot-rolled steel Q355GNHA products are delivered in hot-rolled, controlled-rolled or normalized conditions. Steel grades Q460NH, Q500NH, and Q550NH can be delivered in quenched and tempered conditions, and cold-rolled steels are generally delivered in annealed conditions.
 

Q355GNHA steel application field

Q355GNHA steel plate is widely used in outdoor containers, power plant chimneys, railway projects and other outdoor steels, such as steel for large outdoor sculptures. Weathering steel (that is, atmospheric corrosion resistant steel) is a cheap and high-quality low-alloy steel series between ordinary steel and stainless steel. After incorporating modern metallurgical new mechanisms, new technologies and new processes, it can achieve sustainable development and innovation. Q355GNHA is one of the series of steel grades at the forefront of the world's super steel technology.