S550Q, S550QL and S550QL1 steel plates

Introduction to S550Q, S550QL and S550QL1 steel plates:
S550Q, S550QL and S550QL1 steel plates are European standard quenched and tempered high yield strength structural steel, S represents structural steel, Q represents delivery conditions, and 550 is yield value, unit: MPa.

Chemical composition (melting analysis) of S550Q, S550QL and S550QL1 steel plates:

C

Si

Mn

P

S

Ni

Cr

Mo

Cu

Nb

V

Ti

N

Zr

B

≤0.2

≤0.8

≤1.7

≤0.025

≤0.015

≤2

≤1.5

≤0.7

≤0.5

≤0.06

≤0.12

≤0.05

≤0.015

≤0.15

≤0.005

Mechanical properties of S550Q, S550QL and S550QL1 steel plates:
Thickness 3-50mm
ReH(MPa)≥550
Rm(MPa) 640-820
A(%)≥16
Akv (J) ≥ 30 longitudinal; Transverse: Akv ≥ 27J

Thickness >50-100mm
ReH(MPa)≥530
Rm(MPa) 640-820
A(%)≥16
Akv (J) ≥ 30 longitudinal; Transverse: Akv ≥ 27J

Thickness >100-150mm
ReH(MPa)≥490
Rm(MPa) 590-770
A(%)≥16
Akv (J) ≥ 30 longitudinal; Transverse: Akv ≥ 27J

S550Q steel impact temperature -20℃; S550QL steel impact temperature -40℃; S550QL1 steel impact temperature -60℃.