Q355B Hot Rolled ERW Rectangular Steel Pipes

Q355B is a type of low-alloy high-strength steel with a carbon content ranging from 0.17% to 0.25%, making it a high-carbon steel. Its most prominent characteristic is its high strength, enabling it to withstand large loads. Additionally, Q355B low-alloy high-strength steel also possesses good plasticity and impact resistance. Even at lower temperatures, it can prevent brittle fracture when subjected to impacts. Q355B rectangular welded pipes made from this low-alloy high-strength steel exhibit high-strength performance, making them suitable for structural applications in construction projects.

Q355B ERW Pipe Specification

Size	OD	20~406mm(1/2inch~16inch) in theory
	Thickness	1.2~15.7mm
	Length	Any Length Below 16 Meter
Ends	Plain, Beveled, Thread With Couplings Or Sockets; Plastic Caps And Steel Rings Can Be Provided If Possible
Surface	Bared, Galvanized, Oiled, Color Paint, 3PE; Or Other Anti-corrosive Treatment
Inspection	With Chemical Composition and Mechanical Properties Analysis, Nondestructive Inspection
Technique	Hot Rolled Or Cold Rolled ERW
Package	Hexagon Shape Bundle, Covered With Tarpaulin, Containers Or In Bulk
Method of Payment	T/T L/C

Q355B Welded Tubes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Comparison between Q355B and S355JO, S355JR

Composition: The chemical compositions of Q355B, S355 JO, and S355 JR steels are essentially the same, but S355 JO steel allows for the addition of Nb element, with a content not exceeding 0.045%, whereas S355 JR steel does not allow the addition of Nb element.

Mechanical Performance: The mechanical properties of Q355B, S355 JO, and S355 JR steels are essentially the same, with slightly lower impact absorption energy for S355 JO and S355 JR steels.

Applications:

Q355B, S355 JO, and S355 JR steels are all structural steels, mainly used in industries such as construction, mechanical manufacturing, shipbuilding, and automotive manufacturing.

Q355B steel is primarily used for structures bearing static loads, such as building structures, bridges, and boilers.

S355 JO and S355 JR steels are mainly used for structures bearing dynamic loads, such as mechanical manufacturing, shipbuilding, and automotive manufacturing.

In summary:

Q355B, S355 JO, and S355 JR steels are three similar types of steel, with similar compositions and mechanical properties. S355 JO steel allows for the addition of Nb element, whereas S355 JR steel does not. The impact absorption energy of S355 JO and S355 JR steels is slightly lower.

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