CN105624586A - Corrosion-resisting steel special for bridge support and suitable for marine environment - Google Patents
Corrosion-resisting steel special for bridge support and suitable for marine environment Download PDFInfo
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- CN105624586A CN105624586A CN201511009728.1A CN201511009728A CN105624586A CN 105624586 A CN105624586 A CN 105624586A CN 201511009728 A CN201511009728 A CN 201511009728A CN 105624586 A CN105624586 A CN 105624586A
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
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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
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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
-
- 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
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Abstract
The invention relates to corrosion-resisting steel special for a bridge support and suitable for a marine environment. The steel for the bridge support is characterized by being prepared from, by mass percent, 0.08% to 0.15% of C, 0.16% to 1.0% of Si, 0.5% to 1.6% of Mn, 0.60% to 11.0% of Cr, 0.30% to 2.0% of Ni, 0.01% to 0.5% of Al, not larger than 0.015% of P, not larger than 0.015% of S, not larger than 0.80% of Cu, not larger than 0.06% of V, not larger than 0.35% of Mo and the balance Fe and inevitable impurity elements. A thermal treatment process of the steel for the bridge support comprises the following steps that the steel is heated to 860 DEG C to 950 DEG C from room temperature in a heating furnace, heat preservation is carried out for 3.0 h to 5.0 h, and then the steel is cooled to the room temperature. By means of ingredient proportion adjustment and the thermal treatment process, the corrosion resisting performance and the mechanical property are improved, and the needs of engineering for different corrosion resisting grades and strength grades can be met.
Description
Technical field
The present invention relates to technical field of metal, particularly relate to a kind of corrosion resistant bridge bearing steel being applicable to ocean environment.
Background technology
Bridge pad, as the web member of bridge up-down structure, directly affects use properties and the life-span of bridge, and structure safety and weather resistance to bridge play decisive role. In recent years, along with the fast development of China's Coastal Areas economy, the construction of bridge spanning the sea and beach bridge increases day by day, the chloride environment that these bridge many places, area replace in salt-fresh water, affect by seawater and salt fog, seawater saltness height, chloride ion content is bigger, particularly the long-term temperature in Coastal Areas of South China is higher, and humidity is big, and season wind is strong, bridge pad is even more serious by sea atmosphere corrosion, and the weather resistance of bridge and Years Of Service will be subject to serious impact.
Current bridge pad still adopts the anti-corrosion measures such as japanning, coating or compound coating, and such bearing there will be in ocean environment, and top layer japanning is easily peeled off, the coating easily timeliness problem such as aging, bearing is caused to shorten work-ing life, persistence is poor, have no idea to adopt remedial measures due to ponding position, corner simultaneously, cause material can continue corrosion, deteriorate out of control, bearing overall performance declines to a great extent, the security of serious threat bridge.
Summary of the invention
In view of above-mentioned analysis, the corrosion resistant bridge bearing steel being applicable to ocean environment it is desirable to provide a kind of, this kind of steel can exposed use as bearing, not only has excellent corrosion resistance nature, there is higher mechanical property simultaneously, meet different trade mark performance requriements.
The object of the present invention is mainly achieved through the following technical solutions:
A kind of corrosion resistant bridge bearing steel being applicable to ocean environment of the present invention, described bridge pad composition of steel comprises: by percentage to the quality, C:0.08��0.15%, Si:0.16��1.0%, Mn:0.5��1.6%, Cr:0.60��11.0%, Ni:0.30��2.0%, Al:0.01��0.5%, P��0.015%, S��0.015%, Cu��0.80%, V��0.06% and Mo��0.35%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 860��950 DEG C from room temperature in process furnace, and insulation 3.0��5.0h, is then cooled to room temperature.
Further, the described type of cooling is that sky is cold, stove is cold or the type of cooling of controlled cooling model speed.
Further, the cold mode of described stove is: after cooling to 500 DEG C with the furnace, blow-on sky is chilled to room temperature.
Further, the type of cooling of described controlled cooling model speed is: being cooled to 550 DEG C with the speed of cooling of 80 DEG C/h, then sky is chilled to room temperature.
The composition of described bridge pad steel is described:
The too low steel of C:C content, to smelt difficulty in control big, is not suitable for Steel Castings enterprise equipment condition. The carbon content scope 0.08��0.15% of steel in the present invention.
Si:Si is present in sosoloid form in ferrite or austenite, has stronger solution strengthening effect, it is to increase the intensity of steel. Consider steel casting corrosion resistance nature and mechanical property requirements, Si content span of control Si:0.16��1.0% of the present invention.
Mn: manganese and iron form sosoloid, it is to increase the hardness of ferrite and austenite and intensity in steel. Consider steel casting corrosion resistance nature and mechanical property requirements, Mn content preferable range in the present invention: 0.5��1.6%.
P, S:P, S are often considered to impurity element in steel, and steel is purifying will effectively reduce P, S content, but can increase steel-making cost, therefore, and P, S content range in the present invention: P��0.015%, S��0.015%.
Cu:Cu is the alloying element improving steel erosion resistance, but the test-results according to the present invention, Cu content range in the present invention: 0%��0.8%. The steel not adding Cu can ensure the corrosion resisting property of steel by alloying elements such as Cr, Ni, Mo, Al.
Ni:Ni can improve the resistance to corrosion of steel, according to Cu, Cr proportioning, and Ni content range in the present invention: 0.3��2.0%.
Al:Al is mainly used in deoxidation and crystal grain thinning, and the solidity to corrosion of steel is had certain contribution. Al content range in the present invention: 0.01��0.5%.
V:V precipitates out in ferrite with the form of C, N compound, has very strong precipitation strength effect, simultaneously crystal grain thinning, and therefore, intensity and toughness to steel have certain contribution. The present invention adds V content scope :��0.06%.
Mo:Mo can reduce the possibility of spot corrosion, Mo content range in the present invention :��0.35%.
The useful effect of the present invention is as follows:
A kind of corrosion resistant bridge bearing steel being applicable to ocean environment provided by the invention, by regulation and control composition proportion, the erosion resistance of bridge pad is made to reach maximum raising, and in conjunction with thermal treatment process, improve the mechanical property of bridge pad further, under the prerequisite reaching mechanical property, significantly improve corrosion resistance nature, thus meet engineering to the needs of the corrosion-resistant grade of difference and strength grade.
Other features and advantages of the present invention will be set forth in the following description, and, becoming apparent from specification sheets of part, or understand by implementing the present invention. The object of the present invention and other advantages are by realizing at the specification sheets write, claim book and obtain.
Embodiment
Below in conjunction with preferred embodiment, technical solution of the present invention is further elaborated, it will be appreciated that following examples are only for explaining and set forth the present invention, but do not form the restriction to technical solution of the present invention.
Comprising with composition: by percentage to the quality, C:0.30%, Si:0.17%, Mn:0.87%, P:0.021%, S:0.013%, Cu:0.014%, Cr:0.038%, Ni:0.034%, surplus is Fe and inevitable impurity element, is compared steel.
Embodiment 1
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprising: by percentage to the quality, C:0.08%, Si:1.00%, Mn:0.92%, P:0.006%, S:0.004%, Cu:0.79%, Cr:2.03%, Ni:0.86%, Al:0.025%, V:0.03%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 860 DEG C from room temperature in process furnace, and insulation 3.5h, then sky is chilled to room temperature.
Embodiment 2
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.09%, Si:0.66%, Mn:0.96%, P:0.006%, S:0.004%, Cu:0.75%, Cr:0.63%, Ni:1.21%, Al:0.032%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 900 DEG C from room temperature in process furnace, and insulation 3h, then sky is chilled to room temperature.
Embodiment 3
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprising: by percentage to the quality, C:0.12%, Si:0.51%, Mn:1.12%, P:0.006%, S:0.004%, Cu:0.49%, Cr:0.77%, Ni:0.38%, Al:0.16%, V:0.06%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 4.5h, then sky is chilled to room temperature.
Embodiment 4
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprising: by percentage to the quality, C:0.12%, Si:0.65%, Mn:0.96%, P:0.006%, S:0.004%, Cu:0.39%, Cr:0.83%, Ni:0.032%, Al:0.016%, Mo:0.30%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 930 DEG C from room temperature in process furnace, and insulation 5h, then sky is chilled to room temperature.
Embodiment 5
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.12%, Si:0.66%, Mn:0.93%, P:0.006%, S:0.004%, Cu:0.49%, Cr:0.96%, Ni:0.84%, Al:0.03%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 900 DEG C from room temperature in process furnace, and insulation 4.5h, then sky is chilled to room temperature.
Embodiment 6
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprising: by percentage to the quality, C:0.11%, Si:0.40%, Mn:0.55%, P:< 0.01%, S:< 0.01%, Cu:0.37%, Cr:1.01%, Ni:0.042%, Al:0.49%, Mo:0.34%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 5h, then sky is chilled to room temperature.
Embodiment 7
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.10%, Si:0.33%, Mn:1.24%, P:< 0.01%, S:< 0.01%, Cr:10.78%, Ni:2.00%, Al:0.34%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 5h, then stove is chilled to 500 DEG C, and sky is chilled to room temperature.
Embodiment 8
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.11%, Si:0.26%, Mn:0.79%, P:< 0.01%, S:< 0.01%, Cr:10.33%, Ni:0.31%, Al:0.011%, Mo:0.26%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 5h, then stove is chilled to 500 DEG C, and sky is chilled to room temperature.
Embodiment 9
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.10%, Si:0.18%, Mn:0.67%, P:< 0.01%, S:< 0.01%, Cu:0.34%, Cr:5.31%, Ni:0.30%, Al:0.014%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 4h, is cooled to 550 DEG C with the speed of cooling of 80 DEG C/h, and sky is chilled to room temperature.
Embodiment 10
The embodiment of the present invention provides a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, comprise: by percentage to the quality, C:0.15%, Si:0.16%, Mn:0.50%, P:< 0.01%, S:< 0.01%, Cu:0.30%, Cr:3.27%, Ni:0.52%, Al:0.014%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 950 DEG C from room temperature in process furnace, and insulation 4h, is cooled to 550 DEG C with the speed of cooling of 80 DEG C/h, and sky is chilled to room temperature.
Table 1Each embodiment main chemical compositions (%)
The bridge pad steel of above-described embodiment 1-embodiment 10 and compared steel are carried out week leaching accelerated corrosion tests according to YB/T4367-2014 " reinforcing bar is corrosion test method in chloride environment ", experiment condition is: to cut diameter be a, length be sample etching time in corrosive medium of b is 72h, corrosive medium is 2%NaCl solution, relative humidity is 70 �� 10RH, temperature is 45 DEG C �� 2 DEG C, PH is between 6.5-7.5, and the test period is 60min �� 5min, wherein infiltrates 12min �� 2min; Then average corrosion rate is calculated according to following calculation formula:
W=(w0-wt)��106/[��abt]
In formula: W is erosion rate, g/m2H; wtFor sample corrode the t time eliminate rust after weight, g; w0For the weight before sample corrosion, g; A, b are respectively diameter and the length of sample; T is test period, h.
The corrosion resistance nature comparative result of various embodiments of the present invention and compared steelSuch as table 2Shown in, byTable 2Can find out that the corrosion resistance nature of bridge pad steel of the present invention is significantly better than compared steel.
Table 2Each embodiment and compared steel carry out the average corrosion rate (g/m of week leaching accelerated corrosion test in 2%NaCl solution2��h)
Three kinds of steel of ZG270-500, ZG310-570, ZG340-640 trade mark in the bridge pad steel of above-described embodiment 1-embodiment 10 and GB/T11352-2009 are carried out mechanical property contrast, its resultSuch as table 3Shown in, byTable 3Can find out that the embodiment of the present invention is while the requirement meeting ZG270-500, ZG310-570, ZG340-640 trade mark yield strength and tensile strength, the relative reduction in area of each embodiment, impelling strength, obviously higher than corresponding index requirement, have excellent mechanical property.
Table 3The Mechanics Performance Testing result of each embodiment
Table 4GB/T11352-2009 mechanical property
In sum, embodiments provide a kind of corrosion resistant bridge bearing steel being applicable to ocean environment, by regulation and control composition proportion, the erosion resistance of bridge pad is made to reach maximum raising, and in conjunction with thermal treatment process, improve the mechanical property of bridge pad further, can significantly improve corrosion resistance nature while ensureing that there is higher mechanical property, it is thus possible to meet engineering to the needs of the corrosion-resistant grade of difference and strength grade, increase security in use procedure.
The above; it is only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, any it is familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (4)
1. one kind is applicable to the corrosion resistant bridge bearing steel of ocean environment, it is characterised in that, described bridge pad composition of steel comprises: by percentage to the quality, C:0.08��0.15%, Si:0.16��1.0%, Mn:0.5��1.6%, Cr:0.60��11.0%, Ni:0.30��2.0%, Al:0.01��0.5%, P��0.015%, S��0.015%, Cu��0.80%, V��0.06% and Mo��0.35%, surplus is Fe and inevitable impurity element;
Described bridge pad steel heat treatment process is: be heated to 860��950 DEG C from room temperature in process furnace, and insulation 3.0��5.0h, is then cooled to room temperature.
2. it is applicable to the corrosion resistant bridge bearing steel of ocean environment according to claim 1, it is characterised in that, the described type of cooling is that sky is cold, stove is cold or the type of cooling of controlled cooling model speed.
3. it is applicable to the corrosion resistant bridge bearing steel of ocean environment according to claim 2, it is characterised in that, the cold mode of described stove is: after cooling to 500 DEG C with the furnace, blow-on sky is chilled to room temperature.
4. it is applicable to the corrosion resistant bridge bearing steel of ocean environment according to claim 2, it is characterised in that, the type of cooling of described controlled cooling model speed is: being cooled to 550 DEG C with the speed of cooling of 80 DEG C/h, then sky is chilled to room temperature.
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| CN107254628A (en) * | 2017-05-24 | 2017-10-17 | 首钢总公司 | A kind of resistance to SO2And the construction(al)steel and production method of low chlorine ion concentration corrosion |
| CN108441762A (en) * | 2018-03-20 | 2018-08-24 | 武汉钢铁有限公司 | A kind of Large ocean going vessels engine backing plate steel and production method |
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