GB/T1591 Q420 contains five different steel grades as Q420A,Q420B,Q420C,Q420D and Q420E.Structural steel Q420D,Q420D CARBON PLATE,Q420D STEEL PLATE shall be done impacting test at low temperature minus 20 degree centigrade.Normalised heat treatment suggested to be done for low alloy steel plate Q420D in heavy thickness.
Steel Standard:GB/T1591
Rolling Type:High strength low alloy structural steels
Thickness:6mm-400mm
Width:1500mm-4200mm
Length:3000mm-18000mm
Heat Treatment:As rolled/Control-rolled/Normalised/N+T/QT
Technical Requirements & Additional Services for Q420D 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 Q420D low alloy structural steel:
| Thickness (mm) | ||||
| Q420D | ≤ 16 | > 16 ≤ 35 | > 35 ≤ 50 | >50 |
| Yield strength (≥Mpa) | 420 | 400 | 380 | 360 |
| Tensile strength (Mpa) | 520-680 | |||
Chemical composition for Q420D low alloy structural steel (Heat Analysis Max%)
| Main chemical elements composition of Q420D | ||||||||||
| C | Si | Mn | P | S | V | Nb | Ti | Al (min.) | Cr | Ni |
| 0.20 | 0.55 | 1.00-1.70 | 0.030 | 0.030 | 0.02-0.20 | 0.015-0.060 | 0.02-0.20 | 0.015 | 0.40 | 0.70 |
