CA2793294C - Steel product with improved weathering characteristics in saline environment - Google Patents
Steel product with improved weathering characteristics in saline environment Download PDFInfo
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- CA2793294C CA2793294C CA2793294A CA2793294A CA2793294C CA 2793294 C CA2793294 C CA 2793294C CA 2793294 A CA2793294 A CA 2793294A CA 2793294 A CA2793294 A CA 2793294A CA 2793294 C CA2793294 C CA 2793294C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims description 10
- 239000011780 sodium chloride Substances 0.000 title claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 239000010955 niobium Substances 0.000 claims abstract description 12
- 239000010936 titanium Substances 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000011572 manganese Substances 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000005864 Sulphur Substances 0.000 claims abstract description 4
- 239000004411 aluminium Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 229910000870 Weathering steel Inorganic materials 0.000 abstract description 4
- 239000002436 steel type Substances 0.000 abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001747 exhibiting effect Effects 0.000 abstract description 2
- 229910052598 goethite Inorganic materials 0.000 description 10
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 10
- 239000000460 chlorine Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- -1 Fe2+ ions Chemical class 0.000 description 2
- 229910000074 antimony hydride Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OUULRIDHGPHMNQ-UHFFFAOYSA-N stibane Chemical compound [SbH3] OUULRIDHGPHMNQ-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000004813 Moessbauer spectroscopy Methods 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 108091006629 SLC13A2 Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005290 antiferromagnetic effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The present invention is related to a steel product of the weathering steel type, i.e. a product exhibiting increased corrosion resistance after having been exposed to the outside environment for a given time. According to the invention, the steel product is defined by a composition consisting of (in wt%) : - Carbon between 0.03 and 0.2, - Manganese between 0.5 and 2, - Copper between 0 and 0.5, - Ti between 0 and 0.1, - Cr between 0 and 0.5, - Nickel between 0 and 0.2, - Niobium between 0 and 0.1, - Nitrogen between 0 and 0.01, - Sulphur between 0 and 0.01, Phosphor between 0 and 0.01, - Aluminium higher than 0 and maximum 1.5, - Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than about 0.85wt%.
Description
STEEL PRODUCT WITH IMPROVED WEATHERING CHARACTERISTICS IN
SALINE ENVIRONMENT
Field of the Invention [0001] The present invention is related to steel types and products made thereof, which exhibit an increase in corrosion resistance when exposed to a chlorine-rich environment. These steels are known as weathering steels.
State of the art
SALINE ENVIRONMENT
Field of the Invention [0001] The present invention is related to steel types and products made thereof, which exhibit an increase in corrosion resistance when exposed to a chlorine-rich environment. These steels are known as weathering steels.
State of the art
[0002] Weathering steels have been studied and documented for some time. The corrosion resistance is caused by a layer of rust that forms on the steel surface when it is exposed to the outside environment. Traditional alloying elements which enhance this type of weathering resistance are Cu, P, Cr and Ni. However, traditional weathering steels haven proven to be ineffective in an environment containing Cl ions, i.e. marine or seaside environments. It was observed that the Cl ions destabilize some of the stable components that form the protective oxide layer. Solutions to this problem have been proposed, mainly in the form of changes in the steel composition.
The best results have been achieved so far by applying significantly higher levels of Ni. However, given that a high amount of Ni is needed and taking into account that the price of Ni is a highly critical parameter in the commercial exploitation of steels, this solution is not regarded as ideal, and a need has arisen for an alternative to the Ni-solution.
CD, 02793294 2014-09-11
The best results have been achieved so far by applying significantly higher levels of Ni. However, given that a high amount of Ni is needed and taking into account that the price of Ni is a highly critical parameter in the commercial exploitation of steels, this solution is not regarded as ideal, and a need has arisen for an alternative to the Ni-solution.
CD, 02793294 2014-09-11
[0003] One solution is described in JP2006118011, in the form of a steel composition comprising C, Al, Si, P, Ni, Cu, N, with Sn and/or Sb added in an amount between 0.03 and 0.5wt% and one or more of Ti, Nb, Mo, W, V, Ca or Mg, with the mass ratio of Ni/Cu smaller than or equal to 0.5. The weathering capability in saline environment is mainly obtained by the presence of Sb and/or Sn, which stabilize the amount of Fe2+ ions when the steel is in a wet and saline environment, by reacting with Fe3+ ions, produced by oxidation of Fe2+.
However, the use of Sn and/or Sb is disadvantageous for various reasons :
= both Sn and Sb have a detrimental effect on hot ductility as they decrease the solubility of Cu in austenite at high temperature = Sb has a detrimental effect on weld toughness = Sn can not be removed from the steel during refining = Sb causes a risk of forming Stibine (SbH3) - a toxic and flammable compound.
Alms of the invention
However, the use of Sn and/or Sb is disadvantageous for various reasons :
= both Sn and Sb have a detrimental effect on hot ductility as they decrease the solubility of Cu in austenite at high temperature = Sb has a detrimental effect on weld toughness = Sn can not be removed from the steel during refining = Sb causes a risk of forming Stibine (SbH3) - a toxic and flammable compound.
Alms of the invention
[0004] The present invention aims to provide a weathering steel with a Ni-content in the same order of magnitude as in traditional weathering steels, and with an increased corrosion resistance in marine or seaside conditions, as well as with excellent mechanical properties.
Summary of the invention
Summary of the invention
[0005] The invention is related to a steel product as disclosed. The invention is in particular related to a steel product suitable for use in outdoor environments, in particular in saline conditions. The steel product of the invention may be any type of construction element such as a steel sheet or beam. In particular, the invention is related to a steel composition characterized by the following contents (in wt%) :
- Carbon between 0.03 and 0.2, - Manganese between 0.5 and 2, - Copper between 0 and 0.5, - Ti between 0 and 0.1, - Cr between 0 and 0.5, - Nickel between 0 and 0.2, - Niobium between 0 and 0.1, - Nitrogen between 0 and 0.01, - Sulphur between 0 and 0.01, - Phosphor between 0 and 0.01, - Aluminium higher than 0 and maximum 1.5, - Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than about 0.85wt%.
- Carbon between 0.03 and 0.2, - Manganese between 0.5 and 2, - Copper between 0 and 0.5, - Ti between 0 and 0.1, - Cr between 0 and 0.5, - Nickel between 0 and 0.2, - Niobium between 0 and 0.1, - Nitrogen between 0 and 0.01, - Sulphur between 0 and 0.01, - Phosphor between 0 and 0.01, - Aluminium higher than 0 and maximum 1.5, - Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than about 0.85wt%.
[0006]
According to a preferred embodiment, the following narrower ranges are defined for Cu, Ti, Cr, Ni and Nb (in wt%) :
- Copper between 0.2 and 0.4 - Ti between 0.01 and 0.07, - Cr between 0.2 and 0.5, - Nickel between 0.1 and 0.2, - Niobium between 0.02 and 0.1.
According to a preferred embodiment, the following narrower ranges are defined for Cu, Ti, Cr, Ni and Nb (in wt%) :
- Copper between 0.2 and 0.4 - Ti between 0.01 and 0.07, - Cr between 0.2 and 0.5, - Nickel between 0.1 and 0.2, - Niobium between 0.02 and 0.1.
[0007]
According to the preferred embodiment, the steel product according to the invention comprises no Sn and no Sb.
Detailed description of the invention
According to the preferred embodiment, the steel product according to the invention comprises no Sn and no Sb.
Detailed description of the invention
[0008] The present invention is related to a steel product of the weathering steel type, i.e. a product exhibiting increased corrosion resistance after having been exposed to the outside environment for a given time.
[0009] According to the invention, the steel product is defined by a composition consisting of (in wt%):
¨ Carbon between 0.03 and 0.2, ¨ Manganese between 0.5 and 2, ¨ Copper between 0 and 0.5, ¨ Ti between 0 and 0.1, ¨ Cr between 0 and 0.5, ¨ Nickel between 0 and 0.2, ¨ Niobium between 0 and 0.1, ¨ Nitrogen between 0 and 0.01, ¨ Sulphur between 0 and 0.01, ¨ Phosphor between 0 and 0.01, ¨ Aluminium higher than 0 and maximum 1.5, ¨ Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than 0.85wt%.
The word 'between' as used above is to be understood as inclusive of the borders of the range in question.
¨ Carbon between 0.03 and 0.2, ¨ Manganese between 0.5 and 2, ¨ Copper between 0 and 0.5, ¨ Ti between 0 and 0.1, ¨ Cr between 0 and 0.5, ¨ Nickel between 0 and 0.2, ¨ Niobium between 0 and 0.1, ¨ Nitrogen between 0 and 0.01, ¨ Sulphur between 0 and 0.01, ¨ Phosphor between 0 and 0.01, ¨ Aluminium higher than 0 and maximum 1.5, ¨ Silicon between 0.25 and 1.5, the balance being Fe and accidental impurities, and wherein the sum of the Al and Si levels is higher than 0.85wt%.
The word 'between' as used above is to be understood as inclusive of the borders of the range in question.
[0010] According to a preferred embodiment, the amounts of Cu, Ti, Cr, Ni and Nb are as follows (in wt%) :
¨ Copper between 0.2 and 0.4 ¨ Ti between 0.01 and 0.07 , ¨ Cr between 0.2 and 0.5 .
¨ Nickel between 0.1 and 0.2, ¨ Niobium between 0.02 and 0.1, This embodiment combines good weathering behaviour in saline conditions with excellent mechanical properties, due to the minimum amounts of the abovenamed elements (Cu, Ti, Cr, Ni, Nb).
¨ Copper between 0.2 and 0.4 ¨ Ti between 0.01 and 0.07 , ¨ Cr between 0.2 and 0.5 .
¨ Nickel between 0.1 and 0.2, ¨ Niobium between 0.02 and 0.1, This embodiment combines good weathering behaviour in saline conditions with excellent mechanical properties, due to the minimum amounts of the abovenamed elements (Cu, Ti, Cr, Ni, Nb).
[0011] The present invention reveals that the inventive steel compositions favour the formation of fine 5 grained goethite (a-Fe0OH) in the corrosion layer forming on the surface of a steel product having these compositions, due to the specific combined Al and Si content.
With 'fine grained goethite' is meant goethite with grain sizes from about 8nm to about 15nm. The formation of such fine grained goethite is beneficial for the stability of the oxide layer in saline conditions.
With 'fine grained goethite' is meant goethite with grain sizes from about 8nm to about 15nm. The formation of such fine grained goethite is beneficial for the stability of the oxide layer in saline conditions.
[0012] It is to be noted that the inventive compositions do not necessarily include an addition of significant amounts of the traditional elements regarded as beneficial for weathering resistance in saline conditions, such as Ni. The inventive compositions do not comprise Sn and Sb above an accidental impurity level. Preferably, the steel product of the invention comprises no Sb or Sn.
Elements such as Nb, Ti, Cu, Cr may be added for improving the mechanical properties of the steel, but are not required for ensuring the weathering behaviour in saline conditions.
Elements such as Nb, Ti, Cu, Cr may be added for improving the mechanical properties of the steel, but are not required for ensuring the weathering behaviour in saline conditions.
[0013] The invention is related to any type of steel product having the composition according to the invention, e.g. steel sheets or beams, obtained by any standard steel-making process, e.g. hot-rolled or cold-rolled sheets or beams.
Examples
Examples
[0014] Table 1 shows the compositions of 3 test samples Si to S3 having Al and Si contents according to the invention, as well as 2 comparative samples Cl and C2 having Al and Si contents falling outside of the present invention and/or wherein the combined Al and Si content is less than 0.85wt%. The samples are outside the subject matter of the invention because of the presence of Molybdenum in 31 and the lower levels of Ti, Cu, Ni, Cr and Nb. They are however illustrative of the influence of the combined presence of Al and Si on the goethite formation, and hence on the weathering steel behaviour of products of the invention.
[0015] The test samples have been obtained by standard steel processing methods, involving at least a hot rolling step, possibly followed by a cold rolling step.
The samples were subjected to a dip-dry test during 60 days, using a 0.05M NaC1 solution, in order to test weatherability behaviour in saline conditions. As a result, oxide layers were formed on the samples. The composition of these oxide layers was investigated by Mossbauer spectroscopy, used in particular to measure the relative area of superparamagnetic goethite in the oxide layer.
Superparamagnetic goethite has a particle size between 8 and 15nm, as opposed to antiferromagnetic goethite, having particle sizes above 15nm.
The samples were subjected to a dip-dry test during 60 days, using a 0.05M NaC1 solution, in order to test weatherability behaviour in saline conditions. As a result, oxide layers were formed on the samples. The composition of these oxide layers was investigated by Mossbauer spectroscopy, used in particular to measure the relative area of superparamagnetic goethite in the oxide layer.
Superparamagnetic goethite has a particle size between 8 and 15nm, as opposed to antiferromagnetic goethite, having particle sizes above 15nm.
(0016]
Table 2 clearly shows that the combined Al and Si contents according to the present invention give rise to a considerable increase in the relative area of fine-grained goethite in the oxide layer.
Sample C Si Al P Mn S N Ti Mo Cu Ni Cr Si 0.19 0.35 1.2 0.077 1.6 0.006 0.005 0.007 0.025 0.02 0.025 0.025 S2 0.07 1 0.03 0.02 0.5 0.003 0.003 - 0.3 -S3 0.07 0.25 0.8 0.02 0.5 0.003 0.003 - 0.3 -Cl 0.07 0.25 0.4 0.02 0.5 0.003 0.003 - 0.3 -C2 0.03 0 1 0.01 1.8 0.003 0.007 - 0.4 -Table 1 : example compositions (in wt%) Sample %
Si 51 Cl 15 Table 2:Relative area of superparamagnetic goethite (in %)
Table 2 clearly shows that the combined Al and Si contents according to the present invention give rise to a considerable increase in the relative area of fine-grained goethite in the oxide layer.
Sample C Si Al P Mn S N Ti Mo Cu Ni Cr Si 0.19 0.35 1.2 0.077 1.6 0.006 0.005 0.007 0.025 0.02 0.025 0.025 S2 0.07 1 0.03 0.02 0.5 0.003 0.003 - 0.3 -S3 0.07 0.25 0.8 0.02 0.5 0.003 0.003 - 0.3 -Cl 0.07 0.25 0.4 0.02 0.5 0.003 0.003 - 0.3 -C2 0.03 0 1 0.01 1.8 0.003 0.007 - 0.4 -Table 1 : example compositions (in wt%) Sample %
Si 51 Cl 15 Table 2:Relative area of superparamagnetic goethite (in %)
Claims (4)
1. A steel product consisting of, in wt%:
- Carbon between 0.03 and 0.2, - Manganese between 0.5 and 2, - Copper between 0.2 and 0.4, - Titanium between 0.01 and 0.07, - Chromium between 0.2 and 0.5, - Nickel between 0.1 and 0.2, - Niobium between 0.02 and 0.1, - Nitrogen between 0 and 0.01, - Sulphur between 0 and 0.01, - Phosphorus between 0 and 0.01, - Aluminium higher than 0 and maximum 1.5, - Silicon between 0.25 and 1.5, the balance being Fe and impurities, and wherein the sum of the Al and Si levels is higher than 0.85wt%.
- Carbon between 0.03 and 0.2, - Manganese between 0.5 and 2, - Copper between 0.2 and 0.4, - Titanium between 0.01 and 0.07, - Chromium between 0.2 and 0.5, - Nickel between 0.1 and 0.2, - Niobium between 0.02 and 0.1, - Nitrogen between 0 and 0.01, - Sulphur between 0 and 0.01, - Phosphorus between 0 and 0.01, - Aluminium higher than 0 and maximum 1.5, - Silicon between 0.25 and 1.5, the balance being Fe and impurities, and wherein the sum of the Al and Si levels is higher than 0.85wt%.
2. The steel product according to claim 1, comprising no Sn and no Sb.
3. A steel product according to any one of claims 1 and 2, said product being a sheet or beam.
4. Use of a product according to any one of claims 1 to 3 in saline outdoor conditions.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2010/054086 WO2011120550A1 (en) | 2010-03-29 | 2010-03-29 | Steel product with improved weathering characteristics in saline environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2793294A1 CA2793294A1 (en) | 2011-10-06 |
| CA2793294C true CA2793294C (en) | 2015-09-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2793294A Active CA2793294C (en) | 2010-03-29 | 2010-03-29 | Steel product with improved weathering characteristics in saline environment |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20130078135A1 (en) |
| EP (1) | EP2553132B1 (en) |
| CN (1) | CN102884214B (en) |
| BR (1) | BR112012024642B1 (en) |
| CA (1) | CA2793294C (en) |
| DK (1) | DK2553132T3 (en) |
| ES (1) | ES2544576T3 (en) |
| HR (1) | HRP20150826T1 (en) |
| PL (1) | PL2553132T3 (en) |
| PT (1) | PT2553132E (en) |
| WO (1) | WO2011120550A1 (en) |
| ZA (1) | ZA201207137B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650015A (en) * | 2012-05-29 | 2012-08-29 | 江苏省沙钢钢铁研究院有限公司 | Economical fine-grain high-toughness weather-resistant medium-thickness steel plate and production method thereof |
| US20140170015A1 (en) * | 2012-12-17 | 2014-06-19 | Grzegorz Jan Kusinski | Corrosion resistant steel composition |
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| TW567231B (en) * | 2001-07-25 | 2003-12-21 | Nippon Steel Corp | Multi-phase steel sheet excellent in hole expandability and method of producing the same |
| EP1398390B1 (en) * | 2002-09-11 | 2006-01-18 | ThyssenKrupp Steel AG | Steel with a very fine ferritic and martensitic microstructure having a high tensile strength |
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- 2010-03-29 DK DK10712049.5T patent/DK2553132T3/en active
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Also Published As
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|---|---|
| WO2011120550A1 (en) | 2011-10-06 |
| ES2544576T3 (en) | 2015-09-01 |
| US20130078135A1 (en) | 2013-03-28 |
| EP2553132B1 (en) | 2015-05-06 |
| PT2553132E (en) | 2015-09-10 |
| ZA201207137B (en) | 2014-04-30 |
| DK2553132T3 (en) | 2015-07-27 |
| CA2793294A1 (en) | 2011-10-06 |
| CN102884214A (en) | 2013-01-16 |
| BR112012024642A2 (en) | 2016-06-07 |
| PL2553132T3 (en) | 2015-10-30 |
| CN102884214B (en) | 2015-09-09 |
| EP2553132A1 (en) | 2013-02-06 |
| HRP20150826T1 (en) | 2015-11-20 |
| BR112012024642B1 (en) | 2018-02-06 |
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