WO2000061829A1 - Produit en acier resistant a la corrosion atmospherique - Google Patents
Produit en acier resistant a la corrosion atmospherique Download PDFInfo
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- WO2000061829A1 WO2000061829A1 PCT/JP2000/002274 JP0002274W WO0061829A1 WO 2000061829 A1 WO2000061829 A1 WO 2000061829A1 JP 0002274 W JP0002274 W JP 0002274W WO 0061829 A1 WO0061829 A1 WO 0061829A1
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- 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
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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- 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
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- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- 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
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- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Definitions
- the present invention relates to a weather-resistant steel material, which can reduce flow rust generation advantageously in an environment having a relatively small amount of salt, such as a mountain area, a rural area, and an industrial area.
- the present invention relates to steel materials with excellent seismic resistance and shore weather resistance applicable to steel structures such as bridges used in many environments.
- the term "shore weather resistance” as used in the present invention refers to weather resistance when used in the air in coastal areas. Background art
- Weathering steel which has alloys such as P, Cu, Cr, and Ni added to the steel to improve corrosion resistance in the air, is widely used for structures such as bridges.
- Weather resistant steel forms rust, which is a stable rust that is hard to penetrate oxygen and water, which cause corrosion, in a few years, and suppresses subsequent corrosion. For this reason, weather-resistant steel does not need to be coated with a weather-proof paint, and is a so-called bare-use highly corrosion-resistant material.
- weather-resistant steel requires a long time of several years before stable rust is formed. During that time, flow rust is generated, which impairs the landscape and causes environmental pollution. There was.
- JP-A-6-136557 discloses a steel coated with an aqueous solution of chromium sulfate or an aqueous solution of copper sulfate, dried with water, and further coated with an organic resin.
- Surface treatment methods for materials have been proposed.
- Japanese Patent Application Laid-Open No. 8-13158 proposes a surface treatment method for a steel material in which an aqueous solution containing aluminum ions is applied, and after drying with water, an organic resin film is further formed.
- an object of the present invention is to provide a flow-rust-reduced weather-resistant steel material capable of reducing the occurrence of flow rust during the formation of a stable rust in bare weather-resistant steel in order to meet such a demand. I do.
- a salty environment such as a coastal area
- Weathering steel is a steel material to which P, Cu, Ni, and Cr are added. Under atmospheric conditions, a stable rust that forms a protective film on the steel surface will be formed in several years. Since the stable rust inhibits the further progress of corrosion, corrosion of steel materials is extremely small. Therefore, most are used without painting. However, in a salty environment such as a coastal zone, even weatherproof steel does not form stable rust even after several years, and the corrosion of the steel becomes severe.
- CTIS G 3114 Weathering heat for welded structures Hot-rolled steel
- JP-A-6-136557 has a problem.
- Japanese Patent No. 2572447, Japanese Patent Application Laid-Open No. 5-51668, and Japanese Patent Application Laid-Open No. 8-134587 disclose that a large amount of alloying elements such as P, Cu, Ni, and Mo are added to steel materials to improve shore weather resistance. A method has been proposed.
- the corrosive environment of steel is not always the same depending on the place where it is used.
- the outside of the girder is exposed to rainfall, dew condensation, and sunshine, but the inside of the girder is exposed only to dew condensation, and there is no rainfall.
- the amount of corrosion is smaller inside the girder than inside the girder.
- environments with high incoming salt it is said that corrosion is greater inside the girder than outside the girder. This reversal occurs at a certain amount of incoming salt, but the amount has not been determined.
- the outer girder, main girder, web, etc. are exposed to two environments (with and without rain) simultaneously (on the back of the plate, on the front), and are used for steel structures such as bridges. The steel used must maintain high weather resistance in both environments.
- this type of structural steel material used for bridges, etc. includes a steel material in the rolling direction (L direction) and the direction perpendicular to the rolling direction (C direction) in one-fifth of the Charpy impact test. It was required that the absorbed energy be 47 J or more. However, in the case of a large earthquake such as the Great Hanshin-Awaji Earthquake, depending on the structure and location of the structure, it was found that high stress may act in the plate thickness direction (Z direction) of the members used. Since the Great East Japan Earthquake, structural steel materials have been required to have improved toughness in the thickness direction (Z direction), including the heat affected zone, in order to further increase the seismic resistance of the steel materials.
- the present invention provides a stable rust with good protection in an area with a relatively high salt content such as an area with a relatively low salt content and in a salty environment such as a coastal zone, irrespective of the presence of rain.
- An object of the present invention is to provide a steel material that can be formed, has excellent weather resistance, and has improved toughness in the Z direction including the heat-affected zone in weldability and has excellent earthquake resistance. Disclosure of the invention
- the present inventors have diligently studied measures to reduce the flow rust of weathering steel, and as a result,
- the amount of flow rust can be dramatically reduced. It has been found that a weather-resistant steel material can be obtained.
- the present invention has been made based on this finding, and has as its gist the weight 0/0, C: 0.001 ⁇ 0.050 %, Si: 0.60% or less, Mn: 0.50 ⁇ 3.00%, S: 0.01% or less, A1: 0.10% or less, B: 0.0003-0.0050%. : 0.005 to 0.15%, Cu: 0.1 to 2.0%, Ni: 0.1 to 6.0%, Cr: 0.005 to 1.0%, o: 0.005 to 1.0% And the following (1)
- the present invention is directed to a weathering resistant steel material with reduced flow rust, characterized in that the steel material has a composition of Fe and inevitable impurities.
- one or two selected from Ca: 0.02% or less and REM: 0.02% or less by weight% may be further contained in addition to the above composition.
- the present inventors have found that the toughness in the Z direction is greatly affected by the total amount of inclusions of the A-type and B-type inclusions, even in the case of inclusions, and was derived based on JIS G 0555. It was found that the toughness in the Z direction was significantly improved by setting the total (dA + dB) value of the amounts of the A-type inclusions and the B-type inclusions to not more than 0.030%.
- Figure 1 shows the sum (dA + dB) of the amounts of A-based inclusions and B-based inclusions derived based on the provisions of JIS G 0555, and the Charpy absorbed energy in the Z direction at 15 (VE-5) Shows the relationship.
- the Charpy impact test used ten test pieces for each steel sheet. In the figure, the average value and the minimum value of 10 lines are plotted respectively.
- Fig. 2 shows the relationship between the C-based inclusion amount dC value derived based on the provisions of JIS G 0555 and the Charpy absorbed energy (vE-s) in the Z direction at -5.
- Fig. 2 shows the relationship between the dC value and vE- 5 for steel plates with high (dA + dB) values in the range of 0.021% to 0.028%, which showed high Z-direction toughness in Fig. 1.
- the present inventors have found that it is important to adjust the total (dA + dB) value of the A-based inclusions and the B-based inclusions in order to improve the toughness in the thickness direction. Got a look. In particular, it was found that setting the (dA + dB) value to 0.030% or less significantly improved the toughness in the thickness direction.
- Figures 1 and 2 show findings from coastal weathering steels, but similar results were obtained for flow rust reducing weathering steels ( Figures 3 and 4).
- FIG. 4 is a graph showing the relationship between the toughness in the Z direction and the sum of the amounts of A-based inclusions and B-based inclusions in a coastal weathering steel.
- Figure 2 This is a graph showing the relationship between the toughness in the Z direction and the amount of C-based inclusions in coastal weathering steel.
- 3 is a graph showing the relationship between the toughness in the Z direction and the sum of the amounts of A-based inclusions and B-based inclusions in environmentally weatherable steel having relatively low salt content.
- FIG. 6 is a graph showing the relationship between the amount of flow rust and the A value (the value on the left side of equation (1)) in environmentally weatherable steel with relatively low salt content.
- C is an element that increases the strength of steel.To obtain the desired strength, 0.001% Although the above content is required, if the content exceeds 0.050%, the toughness deteriorates. Therefore, in the present invention, the content is limited to 0.001 to 0.050%.
- the content is preferably 0.005 to 0.030%. Further, the content is preferably 0.005 to 0.025%.
- Si acts as a deoxidizing agent and further increases the strength of steel. However, if contained in a large amount, it deteriorates toughness and weldability, so it was limited to 0.60% or less. In addition, it is preferably 0.15 to 0.50%.
- Mn is an element that greatly contributes to the increase in strength and toughness of steel.In order to secure desired strength, Mn needs to be contained at 0.50% or more in the present invention. Therefore, the weldability was adversely affected, so the range was limited to 0.50 to 3.00%. In addition, it is preferably 0.50 to 1.80%.
- S is limited to 0.01% or less because it deteriorates the weather resistance and further deteriorates the weldability and toughness.
- the content is preferably set to 0.003% or less.
- A1 acts as a deoxidizing agent, but if it exceeds 0.10%, it adversely affects weldability, so the upper limit was set to 0.10%.
- A1 is added as a deoxidizing agent, but if it exceeds 0.10%, aluminum Due to the formation of nascluster, B-based inclusions increase, leading to a decrease in toughness in the thickness direction. Therefore, A1 is preferably limited to 0.10% or less, and from the viewpoint of toughness, is preferably set to 0.05% or less.
- B is an element that improves hardenability and further improves weather resistance, and is an important element in the present invention. Such an effect is recognized at a content of 0.0003% or more, but an effect commensurate with the content cannot be expected if the content exceeds 0.0050%. Therefore, B is limited to the range of 0.0003 to 0.0050%. Preferably, it is in the range of 0.0003 to 0.0030%.
- P is an element that promotes anode dissolution in the initial stage of corrosion of ground iron and densifies rust particles.
- P is preferably contained positively, but if the P content is less than 0.005%, These effects are not observed. Over 0.15% In this case, the effect of improving the weather resistance is saturated, and the weldability further deteriorates. For this reason, P is preferably limited to the range of 0.005 to 0.15%. Incidentally, the content is preferably 0.010 to 0.120%.
- Cu also has the same effect as P. In other words, it is an element that promotes anode dissolution in the early stage of corrosion of ground iron and densifies rust particles. However, if the Cu content is less than 0.1%, the effect is small. On the other hand, if the Cu content exceeds 2.0%, the hot workability is impaired and the effect of improving weather resistance is saturated, which is economically disadvantageous. Therefore, the Cu content is preferably in the range of 0.1 to 2.0%. Preferably, it is in the range of 0.1 to 1.5%.
- Ni densifies rust particles and improves weather resistance, but less than 0.1% has little effect. On the other hand, if the content exceeds 6.0%, the effect is saturated and no effect commensurate with the content is recognized, which is economically disadvantageous. For this reason, Ni is preferably in the range of 0.1 to 6.0%. The range is preferably 0.1 to 3.5% from the viewpoint of weather resistance.
- the Cr is an element that improves the weather resistance in a low salt environment. The effect is small when the content is less than 0.005%. On the other hand, if the content exceeds 1.0%, the effect of improving the weather resistance saturates and becomes economically disadvantageous. Therefore, the Cr content is preferably in the range of 0.005 to 1.0%.
- Cr is not actively added in an environment containing a large amount of salt because Cr deteriorates the weather resistance.
- Mo improves weather resistance and further increases strength, but contains less than 0.005% Then the effect is small. On the other hand, if the content exceeds 1.0%, the effect is saturated and no effect commensurate with the content is recognized, which is economically disadvantageous. Therefore, Mo is preferably in the range of 0.005 to 1.0%. In addition, a range of 0.005 to 0.5% is preferable from the viewpoint of toughness.
- Fig. 5 shows the results obtained from a one-year atmospheric exposure test in a rural area using weather-resistant steel sheets having various compositions
- the horizontal axis shows the value (A value) on the left side of equation (1).
- the vertical axis plots the amount of flow rust (Fe 2+ ) from the test piece.
- setting the A value to 18 or more reduces the amount of flow rust. To be reduced.
- the B content and the content of one or more of P, Cu, Ni, and Mo are determined by the following formula (1) in relation to the amount of incoming salt.
- Nb 0.005 to 0.20%
- Ti 0.005 to 0.20%
- V 0.005 to 0.20%
- Nb, V, and Ti are elements that increase the strength of steel, and one or more of them can be added as necessary. Nb, V, and Ti all show an effect at a content of 0.005% or more, but the effect saturates when they are contained at more than 0.20% each. For this reason, Nb, V, and Ti are each desirably 0.005 to 0.20%.
- REM 1 or 2 types selected from among 0.02% or less REM and Ca have an effect of improving weldability and can be added as necessary. Both REM and Ca are effective when added at 0.0005% or more, but the upper limit is set at 0.02%, because a large amount will degrade the cleanliness of the steel.
- the steel material of the present invention is composed of the balance of Fe and inevitable impurities, and N: 0.010% or less and O: 0.010% or less are inevitable as inevitable impurities.
- Cr 0.1% or less
- N 0.010% or less
- O 0.010% or less
- Cr is an element that improves corrosion resistance and is added to currently marketed weathering steels.
- this is the case in an environment with a low salt content, especially in a region with a high amount of incoming salt such as a coastal zone, which is an element that decreases the weather resistance, and is not intentionally added in the present invention.
- inevitable impurities up to 0.1% is acceptable.
- the specification of JIS G 0555 is adopted.
- the total (dA + dB) value of the amount of A-based inclusions and the amount of B-based inclusions derived on the basis of is set to 0.030% or less.
- the A-based inclusions are those viscously deformed by processing
- the B-based inclusions are those in which the granular inclusions are arranged discontinuously in a group in the processing direction.
- the c-type inclusions inclusions that are irregularly dispersed without viscous deformation are included in the classification.
- the toughness in the Z direction is significantly improved. It is considered that the inclusions of the A system and the B system are sensitive sources of stress and affect the toughness in the Z direction.
- the decrease in the amount of inclusions (dA + dB) in the A and B systems can be reduced by reducing the number of stress concentration sources, especially by reducing the (dA + dB) value to less than 0.030%. Therefore, it is considered that the toughness in the Z direction is significantly improved.
- the reduction of the (dA + dB) value improves corrosion resistance. This is thought to be because the decrease in the amount of inclusions suppresses local corrosion occurring from the interface between the base and the inclusions.
- the steel material of the present invention is smelted by a commonly known smelting method such as a converter method or an electric furnace method, and is made into a steel material by a continuous forming method or an ingot-making method. In the smelting process, vacuum degassing and the like may be performed. Next, these steel materials are heated in a heating furnace or the like, or are directly rolled to a desired shape by hot rolling without heating.
- the steel material of the present invention includes a thick steel plate, a thin steel plate, a steel bar, a section steel, and the like.
- the examples of the present invention are excellent in both toughness and weldability.
- the toughness and weldability of the comparative example (steel type Nos. 12 to 21) and the conventional example (steel type No. 22) are as follows. , 17, 18), but has the same characteristics as those of the example of the present invention.
- the flow rust amount of the present invention example (steel type Nos. 1 to 11) is as low as 29 to 67 / xg / cra 2, and the A value is low without adding B. It is 420 / zg / cm 2 of the conventional example (steel type No. 22).
- the thickness reduction of the present invention example is 8 to 23 // m, which is smaller than 38 m of the conventional example, and the steel material of the present invention has excellent weather resistance. You can see that it is.
- the flow rust amount of the comparative examples (steel types Nos. 12 to 16, 20, and 21) out of the range of the present invention is 300 to 390 ⁇ g / cm 2 , which is larger than that of the present invention examples.
- No. 12 has too low P content and A value
- No. 13 has too high S content and A value too low
- No. 14 has too low Cu content and A value
- No. 16 In both cases, the B content and A value are too low.
- the A value is too low, and the flow rust amount is large in both cases.
- the weather resistance flow rust amount, sheet thickness reduction amount
- the tensile properties and impact properties of these steel sheets and H-section steels were investigated.
- the specimens were sampled at the center of the plate thickness (l / 2t part) in the L and Z directions for steel plates, and for the H-section steel, the center of the plate thickness of the 1/4 flange (l / 2t part). L direction and Z direction.
- the Charpy impact test specimen in the thickness direction (Z direction) was sampled so that the steel plate was pressed against the front and back surfaces of the steel plate to increase the thickness to 55 thighs, and the notch portion became l / 2t.
- the pressure welding was carried out under conditions that took care not to change the structure and properties of the l / 2t part.
- corrosion test specimens of 5mra X 50mm X 100mm were sampled from these steel sheets and H-section steels, shot blasted, and subjected to an atmospheric exposure test to evaluate weather resistance.
- an atmospheric exposure test a rural area with a flying salt content of 0.01 rag / dm 2 / day was selected, and each test piece was placed at a 30 ° angle from the ground to the south and exposed for one year.
- At the same time from the specimen was measured for the amount of flow rust (Fe 2 + ).
- the rust layer formed on the surface of the ground iron was removed, the weight loss of the test piece was measured, and the result was converted to the thickness loss.
- the examples of the present invention have high toughness of vE- 5 : 61 J or more including toughness in the Z direction. Further, the examples of the present invention are excellent in weather resistance evaluated by the amount of reduction in thickness and the amount of flow rust.
- the flow rust amount of the present invention example (steel material No. 1 to steel material No. 17) is as small as 25 to 68 ⁇ g / cm 2, and is smaller than the flow rust amount of the conventional example (steel material No. 26) of 420 ⁇ g / cm 2 .
- the steel material of the present invention has excellent weather resistance.
- the comparative examples (steel materials Nos. 18 to 26) out of the scope of the present invention have low one of the properties of toughness in the Z direction, HAZ toughness (weldability), and weather resistance. Not suitable.
- a Charpy impact test in the thickness direction (Z direction) was also performed.
- the Charpy impact test specimen in the thickness direction (Z direction) was sampled so that the steel plate was pressed against the front and back surfaces of the steel plate, the thickness was increased to 55 thighs, and the notch became 1 / 2t.
- the test was conducted under the condition that the structure and properties of l / 2t part did not change.
- corrosion test specimens of 5mra X 50 marauder X lOOram were collected from these steel sheets and H-section steels, shot blasted, and subjected to an atmospheric exposure test to evaluate the weather resistance.
- the sheet thickness reduction of the example of the present invention is 6 to 32; zm, which is remarkably smaller than the sheet thickness reduction (143 ⁇ ) of the comparative example (commercially weatherable steel, steel material No. 19). Shows weather resistance.
- Direction toughness ⁇ of the present invention example, weldability of the present invention example VE_ 5 indicates a more excellent earthquake resistance 59J are all excellent, including the vE of weld heat affected zone is 169J or more, the weld It shows earthquake resistance. Further, the example of the present invention has a low yield ratio YR of 76% or less, and is excellent in earthquake resistance.
- the comparative examples outside the scope of the present invention all have a large amount of reduction in sheet thickness, and have reduced shore weather resistance, or have deteriorated toughness in the Z direction.
- the sheet thickness reductions of the steel materials No. 11, No. 13, No. 14, No. 15, and No. 17 of the comparative example are much larger than the sheet thickness reductions of the present invention example, and the weather resistance is deteriorated.
- the thickness reduction of steel material No. 12 is the same as that of the present invention, but the inclusion (dA + dB) value is as high as 0.074%, and the toughness in the Z direction is as low as 10E of vE- 5 : 10J. Is declining.
- the steel sheet No. 16 with a high P content has the same reduction in sheet thickness as the example of the present invention and has excellent shore weather resistance, but the toughness in the Z direction is as low as vE- 5 : 33J and the seismic resistance is low. decreased, the toughness of the HA Z portion in Luo, vE_ 5: 31J as low weldability is degraded.
- a Charpy impact test in the thickness direction (Z direction) was also performed.
- the Charpy impact test specimen in the thickness direction (Z direction) was sampled so that the steel plate was pressed against the front and back surfaces of the steel plate to increase the thickness to 55 thighs, and the notch became 1 / 2t.
- the pressure welding was carried out under conditions that took care not to change the structure and properties of the l / 2t part.
- corrosion test specimens of 5 mm x 50 ram x 100 mm were sampled from these steel sheets and H-section steels, shot blasted, subjected to an atmospheric exposure test, and weather resistance was evaluated.
- the sheet thickness reduction of the present invention example is 14 to 40 / xm, which is significantly smaller than the sheet thickness reduction a05 / xm) of the comparative example (commercial weathering steel, steel material N 0.2-16), which is excellent. Shows coastal weather resistance.
- the toughness in the Z direction of the present invention example is excellent in earthquake resistance with vE of 70 J or more.
- weldability of the present invention example are all the VE_ 5 of the welding heat affected zone is shown and more than 292 J, the excellent earthquake resistance.
- the yield ratio YR is also
- the comparative examples outside the scope of the present invention all have a large amount of reduction in sheet thickness, and have reduced shore weather resistance, or have deteriorated toughness in the Z direction.
- the thickness reduction was almost the same as that of the steel of the present invention, but the amount of inclusions was large (dA + dB), and the value was higher than 0.030%. Toughness decreases There is a problem with earthquake resistance.
- the steel material of the present invention is a steel material having excellent weather resistance (shore weather resistance) for coastal areas having a large amount of flying salt, and excellent in toughness in the Z direction including a welded portion, and excellent in earthquake resistance. It can be seen that it is suitable as a steel material for steel structures.
- the present invention it is possible to provide a weather-resistant steel material having excellent earthquake resistance and reduced flow rust.
- these steel materials are used for structures such as bridges, painting, surface treatment, etc. can be omitted, and the economic effect of reducing maintenance costs can be expected.
- the steel material of the present invention can omit painting, surface treatment, and the like even in an environment with a high salt content such as a coastal zone, can be expected to have an economic effect of reducing maintenance costs, and has a remarkable industrial effect.
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Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002333526A CA2333526A1 (en) | 1999-04-08 | 2000-04-07 | Corrosion resistant steel materials |
EP00915415A EP1094126A4 (en) | 1999-04-08 | 2000-04-07 | STEEL PRODUCT RESISTANT TO ATMOSPHERIC CORROSION |
KR1020007013374A KR20010043879A (ko) | 1999-04-08 | 2000-04-07 | 내후성 강재 |
AU36736/00A AU768461B2 (en) | 1999-04-08 | 2000-04-07 | Corrosion resistant steel materials |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP11/101743 | 1999-04-08 | ||
JP10174399 | 1999-04-08 | ||
JP11/107639 | 1999-04-15 | ||
JP10763999 | 1999-04-15 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US71900700A A-371-Of-International | 1999-04-08 | 2000-12-07 | |
US10/236,907 Continuation US6699338B2 (en) | 1999-04-08 | 2002-09-09 | Method of manufacturing corrosion resistant steel materials |
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Publication Number | Publication Date |
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WO2000061829A1 true WO2000061829A1 (fr) | 2000-10-19 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2000/002274 WO2000061829A1 (fr) | 1999-04-08 | 2000-04-07 | Produit en acier resistant a la corrosion atmospherique |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1094126A4 (ja) |
KR (1) | KR20010043879A (ja) |
AU (1) | AU768461B2 (ja) |
CA (1) | CA2333526A1 (ja) |
WO (1) | WO2000061829A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006080658A1 (en) * | 2004-11-12 | 2006-08-03 | Posco | Steel with excellent weather resistance at the seaside atmosphere, and manufacturing method therefor |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU749066B2 (en) * | 1998-06-17 | 2002-06-20 | Kawasaki Steel Corporation | Weatherable steel material |
ATE406466T1 (de) | 2004-10-29 | 2008-09-15 | Alstom Technology Ltd | Kriechfester martensitisch-härtbarer vergütungsstahl |
EP1951922B1 (en) * | 2005-10-25 | 2016-05-18 | Posco | Corrosion resistance improved steel sheet for automotive muffler and method of producing the steel sheet |
CN101578384B (zh) | 2007-12-07 | 2011-06-15 | 新日本制铁株式会社 | 焊接热影响区的ctod特性优异的钢及其制造方法 |
CN102282281B (zh) | 2009-05-19 | 2013-09-18 | 新日铁住金株式会社 | 焊接用钢材及其制造方法 |
CN103667969B (zh) * | 2012-08-31 | 2016-01-27 | 宝山钢铁股份有限公司 | 一种利用低温在线静态再结晶生产钢带的方法 |
CN103667968B (zh) * | 2012-08-31 | 2016-01-27 | 宝山钢铁股份有限公司 | 一种利用低温在线静态再结晶生产钢带的方法 |
CN106521360B (zh) * | 2016-10-26 | 2018-03-09 | 南京钢铁股份有限公司 | 一种免涂装耐候圆钢的生产方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS52150324A (en) * | 1976-06-10 | 1977-12-14 | Nippon Steel Corp | Steel of extremely low sulfure content and its production method |
JPS62256947A (ja) * | 1986-04-28 | 1987-11-09 | Kobe Steel Ltd | 溶接性及び低温靭性に優れた調質高燐型耐候性鋼板 |
JPH059570A (ja) * | 1991-07-03 | 1993-01-19 | Nippon Steel Corp | 高溶接性高強度鋼の製造法 |
JPH08143954A (ja) * | 1994-11-17 | 1996-06-04 | Kobe Steel Ltd | 耐溶接割れ性の優れた引張強さ780N/mm2級鋼板の製造方法 |
JPH08225888A (ja) * | 1995-02-14 | 1996-09-03 | Nkk Corp | 化成処理性に優れた耐食性鋼板およびその冷延鋼板の製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6052522A (ja) * | 1983-08-31 | 1985-03-25 | Nippon Steel Corp | 耐候性鋼材の製造方法 |
US5290370A (en) * | 1991-08-19 | 1994-03-01 | Kawasaki Steel Corporation | Cold-rolled high-tension steel sheet having superior deep drawability and method thereof |
JP2760191B2 (ja) * | 1991-12-20 | 1998-05-28 | 住友金属工業株式会社 | 高温強度特性に優れる鉄骨建築用高耐候性鋼材の製造方法 |
JPH09137218A (ja) * | 1995-11-13 | 1997-05-27 | Kawasaki Steel Corp | 建築構造用h形鋼の製造方法 |
JP3435986B2 (ja) * | 1996-05-31 | 2003-08-11 | Jfeスチール株式会社 | 高加工性めっき鋼板の製造方法 |
-
2000
- 2000-04-07 WO PCT/JP2000/002274 patent/WO2000061829A1/ja not_active Application Discontinuation
- 2000-04-07 KR KR1020007013374A patent/KR20010043879A/ko not_active Application Discontinuation
- 2000-04-07 EP EP00915415A patent/EP1094126A4/en not_active Withdrawn
- 2000-04-07 AU AU36736/00A patent/AU768461B2/en not_active Ceased
- 2000-04-07 CA CA002333526A patent/CA2333526A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52150324A (en) * | 1976-06-10 | 1977-12-14 | Nippon Steel Corp | Steel of extremely low sulfure content and its production method |
JPS62256947A (ja) * | 1986-04-28 | 1987-11-09 | Kobe Steel Ltd | 溶接性及び低温靭性に優れた調質高燐型耐候性鋼板 |
JPH059570A (ja) * | 1991-07-03 | 1993-01-19 | Nippon Steel Corp | 高溶接性高強度鋼の製造法 |
JPH08143954A (ja) * | 1994-11-17 | 1996-06-04 | Kobe Steel Ltd | 耐溶接割れ性の優れた引張強さ780N/mm2級鋼板の製造方法 |
JPH08225888A (ja) * | 1995-02-14 | 1996-09-03 | Nkk Corp | 化成処理性に優れた耐食性鋼板およびその冷延鋼板の製造方法 |
Non-Patent Citations (1)
Title |
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See also references of EP1094126A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006080658A1 (en) * | 2004-11-12 | 2006-08-03 | Posco | Steel with excellent weather resistance at the seaside atmosphere, and manufacturing method therefor |
Also Published As
Publication number | Publication date |
---|---|
KR20010043879A (ko) | 2001-05-25 |
EP1094126A1 (en) | 2001-04-25 |
CA2333526A1 (en) | 2000-10-19 |
EP1094126A4 (en) | 2003-03-05 |
AU768461B2 (en) | 2003-12-11 |
AU3673600A (en) | 2000-11-14 |
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