Corten A Weathering Steel

Corten A is a weather resistant steel created by alloying copper, chromium and nickel. In addition to this, Corten A has added phosphorous which makes the material best suited for gas flue applications and for aesthetic facias The material is not recommended in heavy load bearing applications – in this case Corten B or S355J2W should be considered.

The top layer of the material reacts with atmospheric elements to form a rust coloured protective layer which not only makes the steel virtually maintenance free but also provides a pleasing and consistent finish.

The technical specifications of Corten A are outlined below.

Corten A - Grades and Equivalents

The grades and equivalents of Corten A are provided in the table below.

Corten

EN 10025-5:2004

Corten A

S355 J0WP

Corten A - Chemical Composition

The chemical composition of Corten A is given in the following table.

Element

% by mass

Element

% by mass

C

0.12

Al

0.015/0.06

Si

0.25/0.75

V

Mn

0.20/0.50

Cu

0.25/0.55

P

0.07/0.15

Cr

0.50/1.25

S

0.030

Ni

0.65

Maximum values unless otherwise stated

Corten A - Mechanical Properties

The mechanical properties of Corten A are outlined 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 A

2 – 12

6 – 12

345

485

20

(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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