Q390D Galvanized Sqaure Tube

Galvanized Square tubes Q390D in standard GB/T 34201 owned minimum tensile strength at 490Mpa and yield strength at 390Mpa.Low temperature impacting test at minus 20 Deg.C shall be done for these square hollow sections Q390D.Xinsteel stockholder thousands tons different sizes of hot rolled hot formed finished square hollow section Q390D 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 Q390D low alloy structural steel tube:

Thickness (mm)
Q390D	≤ 16	> 16 ≤ 40	> 40
Yield strength (≥Mpa)	345	335	325
Tensile strength (Mpa)	470-630

►Chemical composition for Q390D low alloy structural steel tube (Heat Analysis Max%)

Main chemical elements composition of Q390D
C	Si	Mn	P	S	Nb	V	Ti
0.20	0.50	1.70	0.030	0.025	0.07	0.20	0.20
Cr	Ni	Cu	N	Mo	B	Als Min.
0.30	0.50	0.30	0.015	0.10	-	0.015