Q420B

Steel grade Q420B,Q420B CARBON PLATE,Q420B STEEL PLATE is under steel specification GB/T1591 which is for high strength low alloy structural steels.When customers need special sizes for steel Q420B useage,we has the ability to cut and weld in our processing plant for small parts,round plate,seal head and other frames.

Technical Requirements & Additional Services for Q420B STEEL PLATE:
♦ Low temperature impacting test
♦ Cutting and welding as per end user’s demands
♦ More striction on some chemical elements contains
♦ Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
♦ Ultrasonic test under GB/T2970,JB4730,EN 10160,ASTM A435,A577,A578 

►Mechnical property for Q420B low alloy structural steel:

Thickness (mm)
Q420B	≤ 16	> 16 ≤ 35	> 35 ≤ 50	>50
Yield strength (≥Mpa)	420	400	380	360
Tensile strength (Mpa)	520-680

►Chemical composition for Q420B low alloy structural steel (Heat Analysis Max%)

Main chemical elements composition of Q420B
C	Si	Mn	P	S	V	Nb	Ti	Cr	Ni
0.20	0.55	1.00-1.70	0.040	0.040	0.02-0.20	0.015-0.060	0.02-0.20	0.40	0.70