What is the difference between Corten A and Corten B

Weathering" means that due to their chemical compositions, these steels exhibit increased resistance to atmospheric corrosion compared to other steels. There are basically two types of Cor-Ten that are most prevalent, Cor-Ten A and Cor-Ten B. COR-TEN A applies to plates up to 12.5mm in thickness, COR-TEN B applies to plates up to 50mm in thickness.

Corten A, as the symbol of weathering steel material, weathering resistant steel or atmospheric corrosion resisting steel. Even, some people called all the weathering steel as Corten Steel.

Corten Bstarted from North America. Corten steel widely used in air preheater, economizer, railway carriage, containers production, bridge building , construction and so on.

Chemical Composition (heat analysis, %

Grade	C	Si	Mn	P	S	Cr	Cu	V	Ni
COR-TEN A	≤0.12	0.25-0.75	0.20-0.50	0.07-0.15	≤0.030	0.50-1.25	0.25-0.55		≤0.65
COR-TEN B	≤0.16	0.30-0.50	0.80-1.25	≤0.030	0.030	0.40-0.65	0.25-0.40	0.02-0.10	≤0.40

Mechanical Properties of COR-TEN A

Grade	Minimum yield point ReH Mpa *)	Tensile strength Rm MPa	Minimum elongation A (Lo=5.65 √So) %
COR-TEN A	355	470 – 630	20

Mechanical Properties of COR-TEN B

Grade	Material thickness mm	Minimum yield point ReH Mpa *)	Tensile strength Rm MPa	Minimum elongation A (Lo=5.65 √So) %
COR-TEN B	≤16	355	470-630	20
	> 16 ≤50	345

General Processing Information

Weathering  Steel can only deal with some important points.

Forming

The conditions for hot forming are in accordance with those stated in EN 10025-5. For cold forming the statements according to table 6 of EN 10025-5 are valid.

Machining

The methods, tools and working processes to be applied comply with the conditions for unalloyed structural steel according to EN 10025-2.

Flame Cutting

COR-TEN is suitable for flame cutting provided proper operating methods are used. At temperatures below 5°C a sufficiently wide zone on either side of the intended cut should be preheated.

Welding

COR-TEN can be welded both manually and mechanically, provided the general rules of welding practices are observed. A prerequisite for obtaining identical mechanical properties in the weld and in the base material is the application of suitable welding consumables and the choice of appropriate welding conditions.

Bolting and Riveting

Joining elements such as bolts, rivets and their accessories (nuts and washers) must be so selected that the formation of local electro-chemical cells are avoided. The joining elements should preferably consist of weathering steel.

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