Hot finished structural hollow sections of non-alloy and fine grain steels

grade

Deoxygenated

Type a

% Mass, maximum

Steel name

Steel nmber

C

Prescribed wall thickness  mm

Si

Mn

P

S

Nbc

≤ 40

＞ 40≤ 120

S235JRH

1.0039

0.17

0.20

—

1.40

0.040

0.040

0.009

S275J0H

1.0149

0.20

0.22

—

1.50

0.035

0.035

0.009

S275J2H

1.0138

0.20

0.22

—

1.50

0.030

0.030

—

S355J0H

1.0547

0.22

0.22

0.55

1.60

0.035

0.035

0.009

S355J2H

1.0576

0.22

0.22

0.55

1.60

0.030

0.030

—

S355K2H

1.0512

0.22

0.22

0.55

1.60

0.030

0.030

—

a The definition of deoxidation method is as follows:

FN = Boiling steel is not allowed

FF = fully-killed steel containing nitrogen-binding elements in an amount sufficient to bind possible nitrogen

(E.g. 0.020% minimum total aluminum or 0.015% soluble aluminum)

b It is allowed to exceed the specified value, as long as the N content increases by 0.001%, the maximum content of P decreases by 0.005% at the same time. The N content in the smelting analysis should not exceed 0.012%.

c If the chemical composition shows a minimum total aluminum content of 0.020% and a minimum Al / N ratio of 2: 1, or if other sufficient nitrogen-binding elements are present, the above maximum nitrogen content limits do not apply. Nitrogen binding elements shall be noted in the inspection documents.