Q550NH Atmospheric Corrosion Resistance Steel Plate

Q550NH is one kind of Chinese Weather Resistant Steel Plate with the standard of GB/T 4117. Comparing with other normal steel, Q550NH has content of alloys such as weathering resisting steel elements of total phosphorus, copper, chromium, nickel, molybdenum, niobium, vanadium, titanium, the above content makes it has good corrossion resistance in atmospheric.

What the Q550NH mean?

• "Q" - indiates the first letter of the Chinese pinyin of the word "yield" in yield strength;
• "550" -means the lower limit of the yield strength of steel, in MPa;
• "NH" - denote the first letter of the Chinese pinyin of the words "Naihou", it means corten steel

Available Dimension for Q550NH:

Steel Coil	heavy steel plate
1.5-19*800-1600	6-50*1600-3000

Product advantage:
1. As it has the good performance of anti atomospheric corrosion, it can extend service life of steel, then save the cost of material.
2. Thanks to it's low-alloy content helps it has superior corrosion resistance
3. Q550NH is friendly to environment, weather resistant steel without coatings or after rust-stabilising surface treatments, so it's environmental and maintenance costs can be greatly reduced.
4. Comparing the other steel plate, Q550NH has higher strength, better weldability.

Product application:
1. It can be used in highly corrosive environments, or be subjected to cyclic traffic loads.
2. With improvment the corrossion resistance in marine atmosphere, more and more bridges were constructed in coastal areas.
3. With the increasing demand of environment, more and more weathering steel are used for outdoor gardening.

Delivery state:
Q550NH delivery in hot-rolled, controlled rolling or normalized state, can also be quenched and tempered in the state of delivery

Chemial content:

C	Si	Mn	P	S	Cu	Cr	Ni
0.16 max	0.65 max	2.00 max	0.025 max	0.03 max	0.20-0.55	0.30-1.25	0.12-0.65

Mechanical properties:

Grade	Thickness
Q550NH	16mm max	16-40 mm	40-60mm	60mm min
Yield strength (Mpa)	550	540	530	530
Tensile strength (Mpa)	620-780