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Q295GNHand Q355GNH high weather resistance structural steel

Q295GNHand Q355GNH high weather resistance structural steel

High weather resistance structural steel products
Standard: GB/T 4171
Grades: Q295GNH, Q355GNH
High weather-resistant structural steel products are mainly used in structures such as vehicles, containers, buildings, towers or other structural parts. Compared with Q355NH welded weather-resistant steel, they have better atmospheric corrosion resistance.

Q295GNH and Q355GNH steel product size


Grades

Quality levels

Size/mm

Coils and sheets

Medium plate

Q295GNH

A, B, C, D, E

1.5-19×800-1600

6-50×1600-3250

Q355GNH

1.5-19×800-1600

6-50×1600-3250

Chemical composition of Q295GNHand Q355GNH:


Grades

chemical composition/%

C

Si

Mn

P

S

Cr

Cu

Ni

Q295GNH

≤0.12

0.1-0.4

0.2-0.50

0.07-0.12

≤0.020

0.3-0.65

0.25-0.45

0.25-0.5

Q355GNH

≤0.12

0.25-0.75

≤1.0

0.07-0.15

≤0.020

0.3-1.25

0.25-0.55

≤0.65

Mechanical properties of Q295GNHand Q355GNH structural steel


Grades

Yield strength/MPa

Tensile strength/MPa

Elongation/%

Q295GNH

≥295

360-510

≥24

Q355GNH

≥355

490-630

≥22

GB/T 4171 Q295GNH and Q355GNH high weather resistance structural steel plates are mainly used in the manufacture of structural parts such as containers, railway vehicles, oil derricks, seaport buildings, oil production platforms, and containers containing hydrogen sulfide corrosive media in chemical and petroleum equipment.

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