Q390B Welded Sqaure Hollow Section

The square welded hollow sections Q390B in standard GB/T3091 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 square hollow section Q390B 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 Q390B low alloy structural steel hollow section:
 

Q390B
Yield strength (≥Mpa)	390
Tensile strength (Mpa)	490-650

►Chemical composition for Q390B low alloy structural steel hollow section (Heat Analysis Max%)
 

Main chemical elements composition of Q390B
C	Si	Mn	P	S	V	Nb	Ti	Cr	Ni
0.20	0.55	1.00-1.60	0.045	0.045	0.02-0.20	0.015-0.060	0.02-0.20	0.30	0.70