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    Corrosion resistant structural steel

    With the rapid change of technologies and gradual update of material, the application of corrosion resistant structural steel has continually expanded. Corrosion resistant structural steel has got more and more attention from manufacturing enterprises and has a tendency to replace common structural steel. The development of the structural steel can’t be without anti-corrosion technology. Now the corrosion resistance of structural steel has become one of the major issues in the world. In a sense, anti-corrosion technology of steel is the key to ensure the proper use and durability of structural steel.

    1. Detailed information

    l   Steel grade and Size

    1. Size, Steel grade and delivery status

    Weathering resistant steel

    Executive standard

    Steel Grade

    Size mm

    Delivery status

    Chinese standard

    GB4171

    Q235NHQ295NHQ355NH

    Q355GNH

    6-80*1600-3250

    ARCRN

    European standard

    EN10025-5

    S355J2WS355K2WS355J0WS355J0WPS355J2WP

    6-80*1600-3250

    ARCRN

    American standard

    ASTM A709

    A709Gr50W BA709Gr50W(T)(F)

    6-80*1600-3250

    ARCRN

    2. Chemical composition Wt%

    Steel Grade

    C

    Mn

    Si

    P

    S

    Cr

    Ni

    Cu

    Q235NH

    ≤0.13

    0.20-0.60

    0.10-0.40

    ≤0.03

    ≤0.03

    0.40-0.80

    ≤0.65

    0.25-0.55

    S355J0WS355J2WS355K2W Q355NH

    ≤0.15

    0.50-1.50

    ≤0.50

    ≤0.03

    ≤0.03

     0.40-0.80

    ≤0.65

    0.25-0.55

    S355J0WPS355J2WPQ355GNH

    ≤0.12

    ≤1.00

    0.20-0.75

    0.07-0.15

    ≤0.02

    0.30-1.25 

    ≤0.65 

    0.25-0.55

    3. Property indexes
    . Chinese standard:

    Steel Grade

    Thickness mm

    Yield strength Mpa

    Tensile strength Mpa

    Elongation %

    180° bend

    Q235NH

    ≤16

    ≥235

    360-510

    ≥25

    d=a

    1640

    ≥225

    d=2a

    4080

    ≥215

    ≥24

    Q295NH

    ≤16

    ≥295

    430-560

    ≥24

    d=2a

    1640

    ≥285

    d=3a

    4080

    ≥275

    ≥23

    Q355NH

    ≤16

    ≥355

    490-630

    ≥22

    d=2a

    1640

    ≥345

    d=3a

    4080

    ≥335

    ≥21

    Q355GNH

    ≤16

    ≥355

    490-630

    ≥22

    d=2a

    1640

    ≥345

    d=3a

    4080

    Note: the 180 ° bend requirement of Q295-355 with the thickness of 6 mm or less is d = a

    Quality level

    V-notch impact test

    sample direction

    temperature /

    Impact energy absorption KV2/J

    A

    longitudinal

    B

    20

    ≥47

    C

    0

    ≥34

    D

    -20

    ≥34

    E

    -40

    ≥27

    . European standard:

    Steel Grades

    Thickness

    Yield strength ReH,Mpa

    Tensile strengthRm,Mpa

    Elongation %

    V longitudinal impact /J

    180°bend

    S355J0W

    S355J2W

    S355K2W

    ≤16

    ≥355

    470-630

    ≥20

    ≥2740

    d=2a

    1640

    ≥345

    4063

    ≥335

    ≥19

    63-80

    ≥325

    ≥18

    S355J0WP

    S355J2WP

    ≤16

    ≥355

    ≥20

    ≥27

    1640

    ≥345

    Note: tensile gauge length L0 = 5.65, quality grade J0 do 0℃ impact, quality grade J2 do -20℃ impact, quality grade K2 do -20 impact and the impact value is 40J or more.

    . American standard:

    Steel Grade

    Thickness

    Yield strength ReL

    Tensile strength Rm

    A50

    V longitudinal impact

    180°cold bend

    MPa

    %

    temperature

    Impact energy /J

    A709Gr50W

    ≤50

    ≥345

    ≥485

    ≥21

    21, 4, -12

    ≥34

    d=3a

    50100

    ≥41



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