galvanized steel manufacturer China
steel round bar manufacturers China
Carbon mild Wear resistant steel plates
June 20, 2022
steel round bar manufacturers China
Carbon Steel Plate
June 20, 2022

High Strength Plate

We has successively developed the high strength plates with yield strength of class 550, 690, 890, 960 and 1100 MPa since 2006, which are mainly used in coal mine machinery, engineering machinery, port machinery, and widely applied in mechanical equipment manufacture including the mining hydraulic support, crane, cement transportation pump, port suspension bridge, etc.

Category:
Description

Detailed information

Grade and Size

Grade Standard Delivery State Product Size available
Thickness (mm) Width (mm) Length (m)
Q550D
Q550E
Enterprise standard TMCP 14~40 1000~2800 ≤16
Q690D
Q690E
Enterprise standard TMCP + tempering 14~30 1000~2800 ≤16
Q550D-QT
Q550E-QT
Enterprise standard Quenching + tempering 5~11 1000~2500 ≤13
12~80 1000~2800 ≤16
Q690D-QT
Q690E-QT
Enterprise standard Quenching + tempering 5~11 1000~2500 ≤13
12~80 1000~2800 ≤16
Q890D
Q890E
Enterprise standard Quenching + tempering 5~11 1000~2500 ≤13
12~60 1000~2800 ≤16
Q960D
Q960E
Enterprise standard Quenching + tempering 5~11 1000~2500 ≤13
12~60 1000~2800 ≤16
Q1100D
Q1100E
Enterprise standard Quenching + tempering 5~11 1000~2500 ≤13
12~30 1000~2800 ≤16

S550Q, S550QL, S690Q, S690QL, S890Q, S890QL, S960Q and S960QL have all pass the certification of CE.

2.2 Chemical composition and mechanical properties
Chemical composition of high strength plate (wt %)

Grade C Mn P S Si Nb Mo Cr Ni B Ceq
Q550D
Q550E
0.10 1.90 0.020 0.005 0.50 0.080 0.30 0.50 0.30 0.003 0.45
Q690D
Q690E
0.10 1.90 0.020 0.005 0.50 0.080 0.30 0.50 0.30 0.003 0.46
Q550D-QT
Q550E-QT
0.18 1.60 0.018 0.007 0.50 0.050 0.50 0.80 0.80 0.0030 0.58
Q690D-QT
Q690E-QT
0.18 1.60 0.018 0.005 0.50 0.050 0.50 0.80 0.80 0.0030 0.62
Q890D
Q890E
0.20 1.60 0.015 0.005 0.40 0.050 0.65 1.20 1.50 0.0030 0.65
Q960D
Q960E
0.20 1.60 0.015 0.005 0.40 0.050 0.65 1.20 1.50 0.0030 0.68
Q1100D
Q1100E
0.22 1.60 0.015 0.005 0.40 0.050 0.65 1.20 1.50 0.0030 0.68

Mechanical properties of high strength plate

Grade Thickness
(mm)
Yield strength
(MPa)
Tensile strength
(MPa)
Elongation ratio
A50%
Elongation ratio
A%
Impact energy
Q550D
Q550E
14~40 ≥550 670~830 ≥21 / ≥47
Q690D
Q690E
16~30 ≥690 780~910 ≥21 / ≥47
Q550D-QT
Q550E-QT
5~80 ≥550 670~830 / ≥16 ≥47
Q690D-QT
Q690E-QT
5~40 ≥690 780~900 / ≥15 ≥47
40~80 760~880
Q890D
Q890E
5~60 ≥890 940~1050 / ≥12 D: ≥40
E: ≥30
Q960D
Q960E
5~50 ≥960 980~1100 / ≥11 D: ≥27
E: ≥27
Q1100D
Q1100E
5~30 ≥1100 1250~1500 / ≥9 D: ≥27
E: ≥27

Impact temperature:D -20℃;E -40℃; Q -20℃; QL -40℃

2.3 Grade Comparison at home and abroad

NISCO standard European standard
EN 10025-6
American standard
ASTMA709
SSAB JFE
Q550D
Q550E
S550Q  / / JFE-HITEN690S
S550QL
Q690D
Q690E
S690Q Grade 100 Weldox 700 JFE-HITEN780S
S690QL
Q890D
Q890E
S890Q / Weldox 900  /
S890QL
Q960D
Q960E
S960Q  / Weldox 960 JFE-HITEN980S
S960QL
Q1100D
Q1100E
 /  / Weldox 1100  /
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