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Plate Corten SPA-H JIS G3125 Steel Properties

Kategori: Corrosion Resistant / Weather Resistant Steel
Grades: SPA-H, Corten A, Corten B
Standard: JIS G3125


Characteristic


Corrosion Resistant Steel (often referred to as Cor–Ten) is a weather resistant steel grade which could more accurately be termed as an "Atmospheric Corrosion Resistant Steel". Weathering means that due to their chemical compositions COR-TEN steel, when utilised unprotected, exhibits increased resistance to atmospheric corrosion compared to unalloyed steels. This is because it forms a protective layer on its surface under the influence of the weather.
Corten steel is a copper chromium alloy steel – this alloy displays a greater level of resistance to atmospheric weathering when compared to other unalloyed steels. It's chemical composition promotes the early formation of an adhering protective layer of rust when exposed to the elements.

Equivalent Grade

Corten A Corten B Corten B-QT Cortern C S355J2WP S355J2WP A588Gr.A
A242 A588Gr.C A588Gr.K A709-50W ASTM A242 ASTM A606 ASTM A847


COR-TEN Steel supplied according to following standard & specification :

  • JIS G3125 SPA-H
  • COR-TEN® A
  • COR-TEN® B
  • ASTM A588 Grade A
  • ASTM A588 Grade B
  • ASTM A588 Grade C
  • ASTM A242 Type-1
  • S355JOWP EN 10025-5
  • S355JOWP+N EN 10025-5
  • S355J2W EN 10025-5
  • S355J2W+N EN 10025-5
  • S355J2G1W EN 10155
  • S355K2G1W EN 10155
  • S355J2G2W EN 10155
  • S355K2G2W EN 10155
  • SAILCOR IRSM41-97

Availability SPA-H JIS G3125

Plate & Sheet
Thickness: 6 - 12mm
Size: 4 x 8 Feet

Basic guidles for the use of this steel in the unprotected condition are described in EN 10025-5 and DASt rule 007.

Chemical Composition (%)


GradeCSiMnPSCrCuVNi
Corten A0.120.25-0.750.20-0.500.07-0.150.0300.50-1.250.25-0.55-0.65
SPA-H0.120.20-0.750.600.07-0.150.0350.30-1.250.25-0.55-0.65

In order to obtain fine grain structure a sufficient amount of nitrogen absorbing elements is added (e.g. ≥0.02% Al).

Mechanical Properties


At room temperature for plates ≥3mm in thickness (transverse test specimans, according to EN 10002). Requirements to hot rolled plates ≤3mm in thickness according to EN 10025-5.

GradeMinimum yield point (ReH Mpa *)Tensile strengthRm MPaMinimum elongation A (Lo=5.65 √So) %
Corten A355470-63020
Corten B ≤16355470-63020
SPA-H35549022

*) 1 Mpa = 1N/mm2
In case of cold rolled material the yield point is min. 310 Mpa and the tensile strength min. 445 MPa. Furthermore cold rolled sheets ≤3mm in thickness made of steel grade COR-TEN A-F for increased demand to the cold formability is available. Mechanical properties: Yield point min. 275 Mpa; Tensile strength min. 410 Mpa; elongation min. 25%. Tolerances on dimensions and shape according to EN 10131.

The notched-bar impact energy is determined on ISO-V longitudinal test specimans at a temperature of - 20°C as an average of three tests. For product thicknesses ≥10mm the average value is at least 27 J. For thicknesses between 10mm and 6mm, the minimum impact value is reduced proportionally to the speciman width (product thickness).

No impact test is performed on products below 6mm in thickness.

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. If the mechanical properties have undergone changes due to cold forming, the properties indicated in the table can be substantially restores by stress relieving - at least 30 minutes at 530°C - 580°C. For higher degrees of cold forming subsequent normalising is recommended.


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. If flame cut edges are to undergo cold forming, the hardening effect should be prevented by preheating - as in the case of S355J2 or the hardened zones must be worked off e.g. by appropriate grinding.


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 appropraite welding conditions. To consider are EN 10025-5 - Technical delivery conditions for structural steels with improved atmospheric corrosion resistance

Recommendations
for welding are also given in EN 1011 part 1 and part 2 - Welding, Recommendations for welding of metallic materials-.

Lime basic electrodes, inert-gas welding wire, and wire/power combinations equivalent to the tensile strength of S355 are used as welding consumables

For unprotected use care must be taken that the welded joint is also weather resistant. This is possible by using welding consumables matching the base material.

If due to design or building specification stress relieving is required, it should be performed in the range temperature from about 530°C to 580°C.


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.

At these joints capillary action can lead to permanent moisture resulting in increased corrosion. Critical zones should therefore be protected by painting, sealing or other protective measures.

In the case of high-strength connections (HV) the conditions for non-weathering structural steels as given in DIN 18800 part 1 apply.

Applications


The steel is used for various types of welded, bolted and riveted constructions e.g. steel frame structures, bridges, tanks and containers, exhaust systems, vehicles and equipment constructions.


Steel Plate Product:

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