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Industeel SUPERELSO® 690CR Quenched and Tempered High Strength Steel for Leg Components of Jack-up Rigs
Categories: Metal; Ferrous Metal; Carbon Steel; Medium Carbon Steel

Material Notes: Superelso® 690 CR (SE 690 CR) is a 690MPa (100ksi) yield strength quenched and tempered steel adapted for jack-up rig legs of offshore drilling platforms. Superelso® 690 CR is manufactured via the electric furnace with dephosphorisation, ladle refining and vacuum degassing to provide a reproducible, clean and homogenous steel. This material has been specially designed for offshore applications requiring the use of heavy thick plates (up to 250 mm/10") with demanding mechanical properties requirements. The chemical composition of SE 690 CR has been carefully adapted and allows the achievement of high impact values (> 50 J at -60°C) across the thickness while respecting the tensile properties required. The main application of Superelso® 690 CR being the manufacturing of racks and chords, particular attention has been paid on forming, oxycutting and welding properties. The very low carbon content of this material allows cutting and welding under classical conditions, increasing in the way the cost efficiency of manufacturing.

Mechanical properties for plates with thickness < 210 mm.
ABS FH 40

Information provided by manufacturer.

Key Words: DNV NVF 690/grade F, ASTM A514-A517
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Mechanical PropertiesOriginal ValueComments
Tensile Strength, Ultimate 840 MPaTypical, 1/4 t
 790 - 940 MPaGuaranteed, 1/4 t
Tensile Strength, Yield >= 690 MPa1/2 t
 770 MPaTypical, 1/2 t
Charpy Impact >= 46.0 J
@Temperature >=-60.0 °C
1/4 t
 65.0 J
@Temperature >=-60.0 °C
Typical down to -60°C (1/4 t)
 
Component Elements PropertiesOriginal ValueComments
Carbon, C <= 0.15 %
Chromium, Cr <= 0.70 %
Iron, Fe 92.738 - 99.85 %As remainder
Manganese, Mn <= 1.2 %
Molybdenum, Mo <= 0.70 %
Nickel, Ni <= 4.0 %
Phosphorus, P <= 0.010 %
Silicon, Si 0.15 - 0.45 %
Sulfur, S <= 0.0020 %
Vanadium, V <= 0.050 %

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NINDUST64 / 17602

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