Corten B Weathering Steel

Corten B is a weather resistant steel which is better suited for heavy and load bearing structures.

The material forms its own protective layer when exposed to atmospheric elements. Essentially, the top layer corrodes which then protects the steel beneath it. The natural finish does not normally require any form of maintenance such as painting, which makes the material a highly cost effective alternative to other structural steels.

Painting and maintenance will be required if the structure is is continually wet as a protective layer will not form. An good example is where the base of the structure meets with the ground or is partially submerged.

The technical specifications of Corten B are outlined below.

Corten B - Grades and Equivalents

The grades and equivalents of Corten B are given in the following table.

Corten

EN 10025-5:2004

Corten B

S355J2W

Corten B - Chemical Composition

The chemical composition of Corten B are mentioned in the following table.

Element

% by mass

Element

% by mass

C

0.19

Al

0.020/0.06

Si

0.30/0.65

V

0.02/0.10

Mn

0.80/1.25

Cu

0.25/0.40

P

0.035

Cr

0.40/0.65

S

0.030

Ni

0.40

Maximum values unless otherwise stated

Corten B - Mechanical Properties

The mechanical properties of Corten B are provided in the following table.

Grade

Thickness (mm)

Strip Products

Plate Products

Yield Strength
Rel N/mm²
Minimum

Tensile Strength
Rm N/mm²
Minimum

Elongation
A50 %
Minimum

Corten B

2 – 13

6 – 40

345

485

19

(Please note: the technical information above is for guidance only – for exact specifications please check with Masteel)

This information has been sourced, reviewed and adapted from materials provided by Masteel UK Ltd.

For more information on this source, please visit Masteel UK Ltd.

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