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June 20, 2022
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Vessel Plate
June 20, 2022

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.

Description

Detailed information

Steel grade and Size

Size, Steel grade and delivery status

Weathering resistant steel Executive standard Steel Grade Size mm Delivery status
Chinese standard GB4171 Q235NH、Q295NH、Q355NH、

Q355GNH

6-80*1600-3250 AR、CR、N
European standard EN10025-5 S355J2W、S355K2W、S355J0W、S355J0WP、S355J2WP 6-80*1600-3250 AR、CR、N
American standard ASTM A709 A709Gr50W B、A709Gr50W(T)(F) 6-80*1600-3250 AR、CR、N
  1. 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
S355J0W、S355J2W、S355K2W 、Q355NH ≤0.15 0.50-1.50 ≤0.50 ≤0.03 ≤0.03  0.40-0.80 ≤0.65 0.25-0.55
S355J0WP、S355J2WP、Q355GNH ≤0.12 ≤1.00 0.20-0.75 0.07-0.15 ≤0.02 0.30-1.25 ≤0.65 0.25-0.55
  1. 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
>16-40 ≥225 d=2a
>40-80 ≥215 ≥24
Q295NH ≤16 ≥295 430-560 ≥24 d=2a
>16-40 ≥285 d=3a
>40-80 ≥275 ≥23
Q355NH ≤16 ≥355 490-630 ≥22 d=2a
>16-40 ≥345 d=3a
>40-80 ≥335 ≥21
Q355GNH ≤16 ≥355 490-630 ≥22 d=2a
>16-40 ≥345 d=3a
>40-80

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 ≥27(40) d=2a
>16-40 ≥345
>40-63 ≥335 ≥19
>63-80 ≥325 ≥18
S355J0WP

S355J2WP

≤16 ≥355 ≥20 ≥27
>16-40 ≥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
>50-100 ≥41
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