q355nhb detail description

About Q355NHB

Q355NHB is Corten steel but also belongs to low alloy series.

• The letter Q is the first letter means yield
• The number 355 refers to its yield strength of 355mpa
• The letter hn means weathering
• The letter b refers to the grade of steel, read as q355 weathering b

It has the advantages of rust resistance and air corrosion resistance. Using weathering steel as structural parts has the advantages of corrosion resistance, life extension, thinning and consumption reduction, labor saving and energy saving.

Weathering steel (Corten steel)

Steel with copper, phosphorus, chromium, nickel and other elements added to improve atmospheric corrosion resistance. This kind of steel is divided into high weathering steel and weathering steel for welding structure.

Q355NHB executive standard

This brand is in accordance with the national standard GB / T 4171-2008.

Q355NHB packaging, mark and quality certificate

The packaging, mark and quality certificate of steel plate shall comply with the provisions of GB / T 247.

Q355NHB chemical composition

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(%)	Cu(%)
0.12-0.21	0.2-2.0	0.50-1.50	Max 0.03	Max 0.03	0.40-0.80	0.65	0.25-0.55

Q355NHB mechanical properties

Yield	Tensile	Impact	Elongation	Reduction in cross section on fracture	As-Heat-Treated Condition
Rp0.2 (MPa)	Rm (MPa)	KV/Ku (J)	A (%)	Z (%)
≥325	490-630	41	21	23	Solution and Aging, Annealing, Ausaging,  Q+T,etc

PS: the specific chemical composition of the finished product shall be indicated in the material specification of the steel plant.

Application and use of Q355NHB:

It is mainly used for railway, vehicle, bridge, tower and other steel structures exposed to air (atmosphere) for a long time. Weathering steel is mainly used in the manufacture of containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipment.