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Q355GNH weathering steel

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Q355GNH weathering steel description:
Executive standard: GB/T 4171-2008
Smelting method: the steel is smelted by converter or electric furnace, and it is killed steel.
Delivery status: hot-rolled steel is delivered in hot-rolled, controlled-rolled or normalized state.

Q355GNH: Q——The first letter of the Chinese pinyin of "Qu" in the yield strength;
355——The lower limit of the lower yield strength of steel, in N/mm²;
GNH——respectively the first letter of "Gao, Nai, Hou" Chinese Pinyin;
Quality grades are divided into A, B, C, D, E

Q355GNH weathering steel is a steel that adds a small amount of alloying elements such as Cu, P, Cr, Ni, etc. to form a protective layer on the surface of the metal substrate to improve the resistance to atmospheric corrosion.

Q355GNH chemical composition:

Chemical composition

Grade

C

Si

Mn

P

S

Cu

Cr

Ni

other

Q355GNH

≤0.12

0.20-0.75

≤1.00

0.07-0.15

≤0.02

0.25-0.55

0.30-1.25

≤0.65

a,b

Q355GNH mechanical properties and process properties:

Stretching test

180° bending test

Yield Strength Mpa

tensile strength Mpa

Elongation%

≤16mm

16-40mm

40-60mm

>60mm

≤16mm

16-40mm

40-60mm

>60mm

≤6mm

6-16mm

>16

355

345

--

--

490-630

22

22

--

--

a

2a

3a

Q355GNH weathering steel, widely used: container, chimney, railway construction and other outdoor steel such as a large outdoor sculpture steel.

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