CN103060714A - Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof - Google Patents
Corrosion-resistant low alloy steel plate for marine splash zones and production method thereof Download PDFInfo
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Abstract
The invention discloses a corrosion-resistant low alloy steel plate for marine splash zones and a production method thereof. The corrosion-resistant low alloy steel plate comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.10-0.30% of Si, 1.60-1.80% of Mn, at most 0.010% of P, at most 0.0080% of S, 0.030-0.050% of Nb, 0.020-0.060% of V, 0.006-0.015% of Ti, 0.90-1.30% of Ni, 0.30-0.60% of Cr, 0.20-0.40% of Cr, 0.40-0.60% of Mo and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting in a vacuum induction furnace, carrying out rolling-controlled cooling-controlled TMCP (thermomechanical rolling process), and carrying out low-temperature tempering heat treatment at 180-250 DEG C. The steel plate disclosed by the invention has the characteristics of favorable conventional mechanical properties (equivalent to Q500E level), strong corrosion resistance, stable production technique, strong operability and the like, and has mass production conditions.
Description
Technical field
The invention belongs to the ferrous metallurgy field, relate to a kind of corrosion-resistant steel, specifically a kind of corrosion-resistant low alloy steel of ocean splash(spray)zone and production method thereof.
Background technology
According to the difference of ferrous materials in the corrosion of ocean different positions, ocean environment can be divided into 5 district's bands: marine atmosphere zone, Seawater splash zone, Tidal zone, submerged zone and seabed earth district.In these 5 district's bands, corrosion behavior there are differences, and is corroded the most serious district's band but splash zone is steel iron facilities in ocean environment.People have done a lot of researchs to the corrosion of ocean environment Zhong Ge district band, and have taked a series of precautionary measures, such as coating protection and galvanic protection etc., have also obtained a lot of achievements in research.But because the singularity of waves splash about zone position is so that galvanic protection is inoperative, the coating protection effect is not fine yet.Waves splash about, and the district is subject to the effect of a series of external factor such as corrodibility composition and oxygen in alternation of wetting and drying, the seawater spittle, sunlight, the atmosphere, also has simultaneously the impact of ferrous materials itself, so that the mechanism of corrosion very complex, the research difficulty is larger.But because this district's band corrosion is the most serious, so receive people's concern always.
The used steel of splash zone must have high-quality within the relatively long time sea water corrosion resistant, briny environment for the splash(spray)zone complexity, domestic steel grade having developed a lot of respective type aspect the exploitation of corrosion-resisting steel, have actual using value and promotion prospect, corrosion-resistant steel (number of patent application CN200610024179.X) such as Baoshan Iron ﹠ Steel Co., Ltd's development and Design, the corrosion-resistant steel of Nanjing Steel stock Co., Ltd's development and Design (number of patent application CN200810122618.X), and the steel of the erosion resistance of Wuhan Iron ﹠ Steel's development and Design (number of patent application CN201010137072.2).If but under the harsher environment of condition, the seawater corrosion-resistant steel erosion rate of generally using is all larger, especially at the more complicated splash(spray)zone of some environment, erosion rate can reach about 0.8mm/a, corrosion resistance nature is very poor, and existing steel grade can not be on active service preferably at splash(spray)zone in this case.
Summary of the invention
In order to overcome the relatively poor problem of ocean splash(spray)zone corrosion resistance nature that exists in the prior art, the purpose of this invention is to provide the corrosion-resistant Low Alloy Steel Plate of a kind of ocean splash(spray)zone and production method thereof, this steel plate solidity to corrosion is better than existing other steel grades that are applied to splash zone, has excellent ocean splash(spray)zone sea water corrosion resistant.
The objective of the invention is to be achieved through the following technical solutions:
Splash(spray)zone corrosion-resistant Low Alloy Steel Plate in a kind of ocean is characterized in that: the chemical composition of this steel plate by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%, Cu:0.20～0.40%, Mo:0.40～0.60%, surplus are Fe and inevitable impurity.
Among the present invention, the chemical composition of this steel plate is preferably by weight percentage, C:0.06%, Si:0.20%, Mn:1.70%, P:0.008%, S :≤0.006%, Nb:0.040%, V:0.050%, Ti:0.012%, Ni:1.10%, Cr:0.50%, Cu:0.30%, Mo:0.50%, surplus is Fe and inevitable impurity.
The restriction reason of composition of steel is described below among the present invention:
Limit C on to be limited to 0.07% be in order to prevent from reducing processibility, although more few better from solidity to corrosion C, in order to make it to have certain physical strength, undergage is decided to be 0.04%.
Si is used for deoxidation, though to determine its add-on will obtain good plate property according to different smelting modes, must be more than 0.10%, above causing the segregation of heart section to reach more than 0.30% and affecting welding property, so stipulate to be limited to 0.30% on it.
Mn has deoxidation and improves the effect of hot workability, and can crystal grain thinning, considers the comprehensive adding of alloy among the present invention, and the present invention stipulates that manganese content add-on is between 1.60-1.80%.
Cr is the most effective element to the solidity to corrosion that improves in the seawater, its content must be just effective more than 0.5%, and the adding of chromium can increase the intensity of steel in addition, but Cr and Cu too high levels will affect the toughness of steel, and causing temper brittleness, chromium content is controlled at 0.30～0.60% among the present invention.
Cu can reduce the corrosion of splash(spray)zone, and content is lower than 0.20% does not have anticorrosion ability, adds 0.40% effect and namely accuses saturatedly, increases and not only is unprofitable to protection against corrosion, is an impediment on the contrary hot workability, so stipulate to be limited to 0.40% on it, is limited to 0.20% down.
Ni by with the compound interpolation of Cu, P, will help to improve the erosion resistance of splash(spray)zone, contain more than 0.90% and just can produce effect, its effect reaches the summit when containing 1.30%, and content is many to welding structural element again, and Ni has the danger that causes fragility, so set upper limit is 0.90%, be limited to 1.30% down.
The trace of Ti adds the solidity to corrosion that also can promote splash(spray)zone, process stipulation minimum 0.006%, on be limited to 0.015%.
Mo also can with the compound interpolation of V, can further improve thus the solidity to corrosion of splash(spray)zone.Mo is very effective to the spot corrosion that improves splash zone, because Al, Cr etc. have the tendency of impelling spot corrosion development, so compound interpolation Mo often.When Mo and V coexistence, can further improve the pitting corrosion resistant performance of steel, general Mo contains significantly lifting of anti-corrosion effect more than 0.40%, is no more than 0.60%, and the addition of V effect when 0.020-0.060% is fine.
Nb also can improve the solidity to corrosion of splash(spray)zone, and General N b addition effect when 0.010-0.050% is more remarkable.
Though P can improve solidity to corrosion, can reduce low-temperature flexibility and hinder weldability, be unsuitable to structure iron, be defined in below 0.010% on this explained hereafter.
S forms inclusion, and solidity to corrosion is had detrimentally affect, is defined in below 0.0080% in general steel-making.
The production method of the corrosion-resistant Low Alloy Steel Plate of a kind of ocean splash(spray)zone is characterized in that this production method comprises following operation:
Smelting technology: adopt vacuum induction furnace smelting, select the lower steel scrap of impurity element, carry out microalloying, smelt into steel ingot, forge into base subsequently, forge temperature between 1000～1200 ℃.The chemical composition of steel billet by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%, Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and inevitable impurity;
Rolling technology: adopt cooling controlling and rolling controlling process, roll front continuous blank heating temperature between 1150 ℃～1220 ℃, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, every time draft 12～25% of roughing, 1000～1080 ℃ of roughing finishing temperatures, the intermediate blank of 2.0～3.0 times of finished product thicknesses; The finish rolling start rolling temperature is 850～900 ℃, rolls rear employing laminar flow cooling, 670～720 ℃ of steel plate final cooling temperatures, 8～15 ℃/s of rate of cooling, subsequently air cooling;
Thermal treatment process: the steel plate behind the air cooling is heated again, Heating temperature is carried out low-temperaturetempering between 180～250 ℃ and is processed, tempering insulation time is 2.0min/mm * thickness of slab+(30 ~ 45) min, and subsequently air cooling obtains the corrosion-resistant Low Alloy Steel Plate of ocean splash(spray)zone to room temperature.
The present invention is by the appropriate design of low-carbon (LC) corrosion resisting alloy element, utilize the thermal treatment process of vacuum metling, rolling technology and low-temperaturetempering, thereby guaranteeing iron and steel some strength toughness, material mechanical performance and toughness reach the Q500E rank, and the corrosion resistance nature of steel is remarkable.In Zhoushan, Sanya, Xiamen Sea Water Splashing Zone erosion rate difference≤0.050mm/a ,≤0.40mm/a ,≤0.10mm/a.And has the mass production condition, stable processing technique, the characteristics such as workable.
The present invention has following advantage:
1, under the prerequisite of the utilization of the present invention chemical composition that is easy to control and the TMCP technique that is easy to realize aborning, process by increasing by one low-temperaturetempering, increasing in the inapparent situation of cost, need not special process, or increase other any equipment, just can obtain the corrosion resistant Low Alloy Steel Plate of a kind of Sea Water Splashing Zone.
2, the present invention not only can be at converter, electrosmelting, also can utilize vacuum metling production, composition is simple, process window is larger, is easy to batch production control.
3, the present invention processes by rolling rear low-temperaturetempering, has effectively alleviated the negative effect of rolling rear unrelieved stress, on the other hand, the hydrogen richness in the steel plate is controlled effectively.
4, compound effective to the spot corrosion that improves splash zone by V and Mo of the present invention adds V in the alloying constituent, and this element can match with Mo, has improved the pitting corrosion resistant performance of alloy, the successful that the splash zone solidity to corrosion is improved.Gain in strength and solidity to corrosion by adding Cr, but because Al, Cr etc. have the tendency of impelling the spot corrosion development, if matrix lacks the Nb element, then the pitting corrosion resistant performance of steel will descend, so the compound interpolation of the present invention by alloying element increased the negative effect that single-element causes.
Embodiment
The corrosion-resistant Low Alloy Steel Plate of a kind of ocean of the present invention splash(spray)zone, in this steel plate the chemical composition of steel by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%, Cu:0.20～0.40%, Mo:0.40～0.60%, surplus are Fe and inevitable impurity.
According to production technique of the present invention, the actual chemical composition of steel grade of the present invention is as shown in table 1.
The chemical composition of table 1 embodiment of the invention (wt%)
Adopt vacuum induction furnace smelting, select the lower steel scrap of impurity element, carry out microalloying, smelt into steel ingot, forge into the rectangular parallelepiped steel billet subsequently, forge temperature between 1000～1100 ℃, the steel billet cross section is 160 * 90 mm.
Rolling technology of the present invention is as follows, adopt cooling controlling and rolling controlling process, roll front continuous blank heating temperature between 1150 ℃～1220 ℃, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, 1000～1080 ℃ of roughing finishing temperatures, the finish rolling start rolling temperature is 850～900 ℃, roll rear employing laminar flow cooling, 670～720 ℃ of steel plate final cooling temperatures, 8～15 ℃/s of rate of cooling, subsequently air cooling.Reduction system is: 90mm → 75 mm → 65 mm → 50mm → 37mm → 25 mm.The concrete technology parameter sees Table 2.
Table 2 rolling technological parameter table
Thermal treatment process: the steel plate behind the air cooling is carried out the low-temperaturetempering heating again, and tempering temperature is 200 ℃, is incubated 80 minutes.
The conventional mechanical property of the present embodiment is as shown in table 3.
The sheet material mechanical property that obtains after table 3 embodiment of the invention tempering heat treatment
| Embodiment | Sample thickness mm | Yield strength MPa | Tensile strength MPa | Unit elongation % | Ballistic work (40 ℃) |
| 1 | 25 | 530 | 610 | 24.2 | 105，152，123 |
Adopt corrosion resistant low alloy steel of the present invention to make experiment material, and choose the simple common Q235 steel of composition and the X70 steel compares chemical composition and the table 4 of comparative example of the present invention as a comparative example.
The chemical composition of table 4 comparative example of the present invention (wt%)
| Embodiment | C | Si | Mn | P | S | Nb | Ti | Cr | Ni | Cu | Al t |
| Comparative example 1-Q235 steel | 0.13 | 0.25 | 0.85 | 0.02 | 0.01 | - | - | - | - | - | 0.018 |
| Comparative example 2-X70 | 0.08 | 0.22 | 1.57 | 0.008 | 0.0007 | 0.030 | 0.012 | 0.13 | 0.25 | 0.036 | 0.015 |
Choose example and comparative example and make the hanging film scene sample, at first line of material is cut into the rectangle lacing film of 200mm ' 150mm ' 5mm, and bore the hole of f 10mm at sample, be convenient to hang.In Yulin, Zhoushan, Xiamen sea area, carry out 1 year (a)+2 year (a) coupon test according to GB GBT_18175-2000.Experimental result is shown in the table 5.
Table 5: seawater coupon test result of the present invention (erosion rate mm/a)
Can find from table 5: under Sanya, Zhoushan, Xiamen sea area, erosion rate of the present invention is all lower, illustrates that the present invention has excellent corrosion resistance nature in Sea Water Splashing Zone.
Claims (3)
1. corrosion-resistant Low Alloy Steel Plate of ocean splash(spray)zone is characterized in that: the chemical composition of this steel plate by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%, Cu:0.20～0.40%, Mo:0.40～0.60%, surplus are Fe and inevitable impurity.
2. the corrosion-resistant Low Alloy Steel Plate of ocean splash(spray)zone according to claim 1 is characterized in that: the chemical composition of this steel plate by weight percentage, C:0.06%, Si:0.20%, Mn:1.70%, P:0.008%, S :≤0.006%, Nb:0.040%, V:0.050%, Ti:0.012%, Ni:1.10%, Cr:0.50%, Cu:0.30%, Mo:0.50%, surplus is Fe and inevitable impurity.
3. the production method of the corrosion-resistant Low Alloy Steel Plate of ocean splash(spray)zone claimed in claim 1 is characterized in that this production method comprises following operation:
Smelting technology: adopt vacuum induction furnace smelting, select the low steel scrap of impurity element, carry out microalloying, smelt into steel ingot, forge into base subsequently, forge temperature between 1000～1200 ℃; The chemical composition of steel billet meets by weight percentage, C:0.04～0.07%, Si:0.10～0.30%, Mn:1.60～1.80%, P :≤0.010%, S :≤0.0080%, Nb:0.030～0.050%, V:0.020～0.060%, Ti:0.006～0.015%, Ni:0.90～1.30%, Cr:0.30～0.60%, Cu:0.20～0.40%, Mo:0.40～0.60%, surplus is Fe and inevitable impurity;
Rolling technology: adopt cooling controlling and rolling controlling process, roll front continuous blank heating temperature between 1150 ℃～1220 ℃, adopt austenite recrystallization district and austenite non-recrystallization district two-stage control rolling, every time draft 12～25% of roughing, 1000～1080 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 2.0～3.0 times of finished product thicknesses; The finish rolling start rolling temperature is 850～900 ℃, rolls rear employing laminar flow cooling, 670～720 ℃ of steel plate final cooling temperatures, 8～15 ℃/s of rate of cooling, subsequently air cooling;
Thermal treatment process: the steel plate behind the air cooling is heated again, Heating temperature is carried out low-temperaturetempering between 180～250 ℃ and is processed, tempering insulation time is 2.0min/mm * thickness of slab+(30 ~ 45) min, and subsequently air cooling obtains the corrosion-resistant Low Alloy Steel Plate of ocean splash(spray)zone to room temperature.
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| CN103290186A (en) * | 2013-06-14 | 2013-09-11 | 首钢总公司 | Manufacturing method of corrosion-proof steel plate used for crude oil tanker cargo oil hold inner bottom plate and steel plate |
| CN103305761A (en) * | 2013-06-14 | 2013-09-18 | 首钢总公司 | Corrosion-resistant steel for bottom board in cargo oil compartment of crude oil tanker |
| CN105039865A (en) * | 2015-08-26 | 2015-11-11 | 江苏省沙钢钢铁研究院有限公司 | High-strength and high-tenacity steel plate and manufacturing method thereof |
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| CN111218613A (en) * | 2020-01-08 | 2020-06-02 | 河北华进贸易有限公司 | Marine weather-proof bridge steel plate |
| CN113549819A (en) * | 2021-06-29 | 2021-10-26 | 鞍钢股份有限公司 | High-performance steel plate for resisting corrosion in ocean splash zone and production method thereof |
| CN113549819B (en) * | 2021-06-29 | 2022-05-17 | 鞍钢股份有限公司 | High-performance steel plate for resisting corrosion in ocean splash zone and production method thereof |
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Application publication date: 20130424 |