Q345B Welded Rectangular Hollow Section

The Welded rectangular hollow sections Q345B in standard GB/T3091 and GB/T3092 mainly used in all types of buildings,highway guardrails and signage,support columns,trusses,bridges,heavy equipment,storage systems and exercise equipments.Xinsteel stockholder thousands tons different sizes of hot rolled hot formed finished rectangular hollow section Q345B with seamless type and welded type.

Technical Requirements & Additional Services:
♦ Galvanized coating according to GB/T 13912
♦ Dimension tolerance according to GB/T6728
♦ Ultrasonic test under EN 10160,ASTM A435,A577,A578
♦ Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
♦ Surface Protection:Black,Varnish,Hot Dip Galvanized,Coating with shop prime.
 

►Mechnical property for Q345B low alloy structural steel hollow section:

Q345B
Yield strength (≥Mpa)	345
Tensile strength (Mpa)	470-630

►Chemical composition for Q345B low alloy structural steel hollow section (Heat Analysis Max%)

Main chemical elements composition of Q345B
C	Si	Mn	P	S	V	Nb	Ti
0.20	0.55	1.00-1.60	0.045	0.045	0.02-0.15	0.015-0.060	0.02-0.20