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    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.

    1. 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 temperatureD -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

     /

     /

    Comparison of high strength plates for different standards (for reference


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