What is Corten Steel?

What’s Corten Steel – S300J2W ?

S300J2W Steel or COR-TEN (known also as Weathering Steel) is a special Steel Alloy inclusive of copper, chromium and phosphorus. It forms a durable rust-like appearance when exposed to the weather for several months.
The “Weathering” term is used because, due to the chemical composition of COR-TEN, resistance to atmospheric corrosion is higher compared to other types of steels. COR-TEN forms a protective layer on its surface under the influence of the weather. This is not corrosion but simply an oxidation which has the same color of rust without being rust.
Being particularly resistant to corrosion and to tensile strength COR-TEN is widely used for the construction of bridges, guard-rails, containers, posts for vineyards, windows and doors.

Guardrails Autostrada del Brennero
sika corten vineyard posts
sika corten vineyard posts
sika corten vineyard posts

ADVANTAGES

– High structural resistance .

– Unique aesthetical characteristics: brown color very closed to wood

– 10 times higher resistance to corrosion compared to the standard steels, even in critical application.

– Long life.

– Natural, ecologic, 100% recyclable material

SURFACE FINISHING

The “Rust-looking” finish is the result of an oxidation process: actually this is a protection against corrosion.

TECHNICAL SPECIFICATIONS (hot rolled coils)

Yield Strength Re (N / mm2)……………………………….. 355

Tensile Strength Rm (N / mm2)………………………….. 460

Elongation Al80mm(%)………………………………………..> 26

CHEMICAL COMPOSITION

Element C Mn Si P S Cr Ni Mo Cu Sn Al
Min 0,30 0,15 0,4 0,25 0,02
Max 0,06 0,40 0,25 0,02 0,01 0,5 0,25 0,04 0,40 0,025 0,35

Example of Sika’s certificate 

CORROSION EXAMPLE 

LOCATION Rust thickness over the nominal thickness during a period of 10 years
First 10 years (mm) Each year after the 10th (mm)
Countryside 0,10 0,05
City (1) 0,20 0,05
Industrial area (2) 0,20 0,10
  • (SO2) Sulphur dioxide: main air impurity
  • Air contains also chlorine not only Sulphur dioxide (SO2). Also for areas near sea salt water.

 

Acciaio Decapato – Acciaio Corten