CN104962832A - Niobium-containing R4 mooring cable steel and heat treatment technology and production method thereof - Google Patents
Niobium-containing R4 mooring cable steel and heat treatment technology and production method thereof Download PDFInfo
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- CN104962832A CN104962832A CN201510229398.0A CN201510229398A CN104962832A CN 104962832 A CN104962832 A CN 104962832A CN 201510229398 A CN201510229398 A CN 201510229398A CN 104962832 A CN104962832 A CN 104962832A
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Abstract
The present invention relates to a niobium-containing R4 mooring cable steel and a heat treatment technology and a production method thereof, and the niobium-containing R4 mooring cable steel containing the following components by mass: 0.26-0.31 parts of C, 0.15-0.40 parts of Si, 0.60-0.90 parts of Mn, less than or equal to 0.010 parts of P, less than or equal to 0.005 parts of S, 1.00-1.20 parts of Cr, 0.20-0.30 parts of Mo, 0.50-0 .80 parts of Ni, 0.055-0.075 parts of Nb, 0.010-0.030 parts of Ti, 0.25-0.40 parts of Cu, 0.0008-0.0030 parts of B, 0.015-0 .050 parts of Als, and the balance of iron and trace impurities. The heat treatment technology comprises the steps of (1) quenching, to be more specific, the mooring chain steel is heated to a temperature of 900-950 DEG C, in the temperature section, the heating holding time is calculated by 1.5-2.0min / mm, and then the mooring chain steel is cooled; and (2) tempering, to be more specific, the mooring chain steel is heated to a temperature of 600-650DEG C, the heating holding time is calculated by 2-2.5min / mm, and then the mooring chain steel is cooled. The R4 mooring cable steel is developed, and the hardenability, corrosion resistance, fatigue resistance and low temperature toughness of the R4 mooring cable steel are significantly improved, and the overall performance uniformity.
Description
Technical field
The present invention relates to large gauge R4 mooring chain steel and thermal treatment process thereof, be specifically related to a kind of containing niobium R4 mooring chain steel and thermal treatment process thereof and production method.
Background technology
Mooring chain product is mainly used in marine oil, Natural gas extraction floating production system, semi-submersible rig, swinging mooring's structure and floating production storage unit ship and other ocean exploitation facility etc., and its quality product is related to the security of offshore operation and ship's navigation.Due to mooring chain long period of soaking in the seawater, inclement condition, not only intensity is high, good toughness therefore to require mooring chain steel, but also require that there is seawater corrosion resistance, antifatigue is destroyed, the characteristic such as wear-resistant.Different according to the strength level used, mooring chain product mainly contains R3, R3S, R4, R4S, R5 level etc.
In recent years, the exploitation of recovering the oil along with deep-sea, exploring, increases gradually to the demand of deep-sea oil recovery, exploring equipment high strength, large gauge mooring chain (Ф 90mm ~ Ф 210mm).Due to the modified cooling difficulty of large gauge mooring chain product, cause the whole through hardening difficulty of mooring chain total cross section, at present, countries in the world R4 level large gauge mooring chain steel product all adopts high alloy to become offshoot program (being roughly 0.22C-1.4Mn-1.3Cr-1.2Ni-0.5Mo), to improve its hardening capacity, thus meet the modified rear high strength of large gauge mooring chain product, high tenacity, fatigue proof requirement, but there is following defect in it:
(1) because alloying element content is high, cause material As rolled to be organized as half martensite tissue, material must carry out anneal before delivery, otherwise material can produce martensitic transformation in put procedure, produce structural stress, thus internal fissure is scrapped to cause material to occur.
(2) because the alloying element contents such as Mn, Cr, Mo are high, the weldability of steel can be worsened, increase the probability of occurrence of welding crack.
(3) because alloying element content is high, improve the risk of mooring chain hardening break, and yield tensile ratio also often defective (>0.92).
(4) production cost is added.
Summary of the invention
The object of the present invention is to provide a kind of containing niobium R4 mooring chain steel and thermal treatment process thereof and production method, utilize micro-Nb, Ti, B and a small amount of Ni, Cu, Mo, Cr, Mn composite alloying principle, in conjunction with to optimization of Heat Treatment Process, under the prerequisite reducing production cost, significantly improve the hardening capacity of R4 mooring chain steel, erosion resistance, fatigue resistance and low-temperature flexibility, and then significantly improve the overall performance homogeneity of R4 mooring chain steel, life-span and security, thus produce the R4 mooring chain steel of low-cost and high-performance.Concrete technical scheme is as follows:
A kind of containing niobium R4 mooring chain steel, according to mass percent containing, for example lower component: C:0.26 ~ 0.31, Si:0.15 ~ 0.40, Mn:0.60 ~ 0.90, P :≤0.010, S :≤0.005, Cr:1.00 ~ 1.20, Mo:0.20 ~ 0.30, Ni:0.50 ~ 0.80, Nb:0.055 ~ 0.075, Ti:0.010 ~ 0.030, Cu:0.25 ~ 0.40, B:0.0008 ~ 0.0030, Als:0.015 ~ 0.050, all the other are iron and remaining trace impurity.
The above-mentioned thermal treatment process containing niobium R4 mooring chain steel, comprises the steps:
(1) quench: mooring chain steel is heated to temperature 900 ~ 950 DEG C, calculate by 1.5 ~ 2.0min/mm in this temperature section heating and thermal insulation time, cooling.
(2) tempering: mooring chain steel is heated to temperature 600 ~ 650 DEG C, calculated by 2 ~ 2.5min/mm in this temperature section heating and thermal insulation time, cooling.
Further, the rate of heating in step (1) and/or (2) is 50 ~ 100 DEG C/h.
Further, the middle water-cooled of step (1) is to room temperature.
Further, step (2) hollow cold is to room temperature.
Further, in step (1), be heated to temperature 930 DEG C with 80 DEG C/h, heating and thermal insulation time 270min, water-cooled.
Further, in step (2), be heated to temperature 620 DEG C with 80 DEG C/h, heating and thermal insulation time 420min, air cooling.
The above-mentioned production method containing niobium R4 mooring chain steel, further, comprises the steps:
A. electric arc furnace or converter smelting;
The refining of b.LF stove;
C.RH or VD vacuum outgas;
D. continuous casting;
E. strand process furnace heating;
F. round rolling;
G. mooring chain forging;
H. Tempering and Quenching.
Further, thermal treatment comprises the steps:
(1) quench: mooring chain steel is heated to temperature 900 ~ 950 DEG C, calculate by 1.5 ~ 2.0min/mm in this temperature section heating and thermal insulation time, cooling.
(2) tempering: mooring chain steel is heated to temperature 600 ~ 650 DEG C, calculated by 2 ~ 2.5min/mm in this temperature section heating and thermal insulation time, cooling.
Compared with currently available technology, the present invention is by adopting micro-Nb, Ti, B and a small amount of Ni, Cu, Mo, Cr, Mn composite alloying principle, in conjunction with to optimization of Heat Treatment Process, by refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtain the structural state with even fine and closely woven sorbite+lower bainite metallographic structure, have developed R4 mooring chain steel, significantly improve the hardening capacity of R4 mooring chain steel, erosion resistance, fatigue resistance and low-temperature flexibility, and then significantly improve the overall performance homogeneity of R4 mooring chain, life-span and security, thus produced the R4 mooring chain of low-cost and high-performance.The product that this technology is produced meets the requirement of relevant criterion completely, enhances the competitive power of enterprise.
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, there is provided a kind of containing niobium R4 mooring chain steel and thermal treatment process thereof, mass percent (wt%) containing niobium R4 mooring chain steel chemical composition is: C:0.26 ~ 0.31, Si:0.15 ~ 0.40, Mn:0.60 ~ 0.90, P :≤0.010, S :≤0.005, Cr:1.00 ~ 1.20, Mo:0.20 ~ 0.30, Ni:0.50 ~ 0.80, Nb:0.055 ~ 0.075, Ti:0.010 ~ 0.030, Cu:0.25 ~ 0.40, B:0.0008 ~ 0.0030, Als:0.015 ~ 0.050, all the other are iron and remaining trace impurity.Steel of the present invention has carried out Composition Design with polynary a small amount of alloying principle:
(1) carbon: C is main strengthening element and improves hardening capacity element, but the too high meeting of C causes the reduction of the plasticity of steel and toughness, welding property worsens.For ensureing the plasticity of steel, toughness and welding property, C content is unsuitable too high, and the intensity of loss is then made up by other alloying element and microalloy element.Consider, the C content scope of R4 mooring chain steel should be advisable 0.26% ~ 0.31%.
(2) silicon: Si is the most obvious element of solution strengthening effect, is also to the maximum element of loss in toughness simultaneously.Consider from over-all properties, do not adopt Si as main strengthening element, therefore Si content controls, in general lower level, to be advisable to be no more than 0.4%, and scope is considered 0.15% ~ 0.40%.
(3) manganese: Mn mainly plays solution strengthening and improves hardening capacity effect.But Mn easily produces component segregation, affect the homogeneity of structure and properties.Particularly Mn content is higher, can increase martensite content in tissue, thus improves yield tensile ratio, causes yield tensile ratio to exceed standard.Therefore R4 mooring chain steel design Mn content of the present invention is advisable to be no more than 1.0%, and range-controllable is built in 0.60% ~ 0.90%.
(4) chromium: Cr can increase the hardening capacity of steel, after impelling quenching and tempering, the whole cross section of workpiece obtains and organizes more uniformly.But its too high levels, can worsen the weldability of mooring chain steel.Consider, Cr range-controllable is built in 1.00% ~ 1.20%.
(5) molybdenum: Mo can improve hardening capacity and the heat resistance of steel significantly, prevents temper brittleness; Meanwhile, Mo can make the grain refining of steel, improve the obdurability of steel, but the cost of Mo is higher, and its too high levels also can worsen the welding property of steel.Consider, range-controllable is built in 0.20% ~ 0.30%.
(6) nickel: Ni has the tissue of refinement steel, improves the effect of the low-temperature performance of steel, and there is solution strengthening, the effect of raising hardening capacity, but it is expensive, and Ni also improves one of element of steel yield tensile ratio, consider, range-controllable is built in 0.50 ~ 0.80%.
(7) copper: copper expands the element of austenite phase field, but solid solubility in iron is little, and copper and carbon do not form carbide.Copper is stabilization of austenite element, can improve the hardening capacity of steel, tissue after refinement changes, thus improves the low-temperature flexibility of steel.And the solubleness of copper in a-Fe sharply can decline along with the reduction of temperature, can play the effect of precipitation strength, copper on the impact of critical temperature and hardening capacity and its solution strengthening effect similar to nickel, can be used to replace a part of nickel, to reduce production cost.Simultaneously, in steel, add the anti-fatigue performance that copper also can improve steel, because tiny Cu precipitates the formation of having blocked tired initial stage vein texture, and copper precipitate has good plasticity, the expansion of fatigue cracking can be hindered, thus improve the fatigue strength of steel; In addition, Cu also increases significantly the effect of steel solidity to corrosion, adds 0.1%Cu and can significantly improve its solidity to corrosion in steel.But Cu too high levels, steel easily causes hot-short in heating rolling or forging process.Consider, range-controllable is built in 0.25 ~ 0.40%.
(8) niobium: Nb is grain refining, precipitation strength and phase transformation strengthening to mooring chain strengthen and toughen effect main manifestations.Nb exists to replace solute atoms in steel, Nb atomic ratio iron atom size is large, easily segregation on dislocation line, strong effect of dragging is produced to climb of dislocation, Recrystallization nucleation is suppressed, to recrystallize, there is strong interception, improve austenitic recrystallization temperature, thus reaching the object of fining austenite grains, grain refining can not only improve the obdurability of steel, and improves the low-temperature performance of steel.Meanwhile, by the precipitation strength of its carbonitride, the intensity of steel also can be significantly improved.But it is expensive.Consider, the range-controllable of Nb is built in 0.055% ~ 0.075%.
(9) titanium: add tiny alloying element Ti and can play solid solution, segregation and precipitating action in steel, when them and carbon, nitrogen, sulphur etc., Interaction Energy produces refined crystalline strengthening, precipitate dispersion-strengthened and inclusion conditioning etc., the intensity of steel and toughness are strengthened, and steel belt roof bolt stability can be improved, improves the welding property of steel.Consider, the range-controllable of Ti is built in 0.015% ~ 0.030%.
(10) boron: when containing (0.0008 ~ 0.0030%) boron of trace in steel, the hardening capacity of steel can significantly improve, be the medium carbon structural alloy steel of 0.26 ~ 0.31% for C content, after adding boron, its maximum through hardening diameter can improve more than 50%.For large section interalloy mooring chain steel, exist and to quench not saturating problem, cause large gauge mooring chain cross section microstructure and performance uneven, have impact on the overall performance index of mooring chain, therefore need to improve its hardening capacity further by boron alloyed.Meanwhile, boron alloyed cost is low, and the quenching crack susceptibility impact of boron on steel is very little.
The present embodiment large gauge containing the niobium R4 mooring chain steel technological process of production is: electric arc furnace or converter smelting → LF stove refining → RH or VD vacuum outgas → continuous casting → strand process furnace heating → round rolling → mooring chain forging → Tempering and Quenching.
The thermal treatment process step of the present embodiment key is as follows:
(1) quench: mooring chain steel heating (rate of heating is 50 ~ 100 DEG C/h), to temperature 900 ~ 950 DEG C, calculates by 1.5 ~ 2.0min/mm in this temperature section heating and thermal insulation time, carries out water-cooled subsequently to room temperature.
(2) tempering: mooring chain steel heating (rate of heating is 50 ~ 100 DEG C/h) is to temperature 600 ~ 650 DEG C, and calculate by 2 ~ 2.5min/mm in this temperature section heating and thermal insulation time, air cooling is to room temperature subsequently.Through tempering, the metallographic structure of even fine and closely woven tempered sorbite+lower bainite can be obtained, thus good toughness plasticity and suitable intensity index can be obtained.
Adopt the R4 mooring chain steel that chemical composition of the present invention, technical process and thermal treatment process processing parameter are produced, the vertical mixing coefficient measuring steel can reach: R
m>=860MPa, R
p0.2>=580MPa, R
p0.2/ R
m≤ 0.92, A>=12%, Z>=50% ,-40 DEG C of impact absorbing energy KV
2>=50J, corrosion fatigue limit>=190MPa, and hydrogen embrittlement performance Z1/Z2>=0.85 (in formula: Z1---without the relative reduction in area of curing sample; Z2---through curing the relative reduction in area of sample), the autstenitic grain size of steel is more than or equal to 8.0 grades.After R4 mooring chain modified (quenching+high tempering) thermal treatment, steel is organized as tempered sorbite+bainite, wherein, the nearly surface tempering sorbite percentage of mooring chain is about 90 ~ 100%, and mooring chain 1/2 radius tempered sorbite content is about 50 ~ 70%.
In a preferred embodiment, melting chemical composition, the mainly embodiment of heat treatment process parameter and performance of R4 mooring chain steel are as follows:
Thermal treatment process step and parameter are:
(1) quench: be heated to temperature 930 DEG C with 80 DEG C/h, heating and thermal insulation time 270min, water-cooled.
(2) tempering: be heated to temperature 620 DEG C with 80 DEG C/h, heating and thermal insulation time 420min, air cooling.
Diameter be R4 mooring chain steel melting chemical composition mass percent (wt%) of Φ 200mm in table 1, the performance index of R4 mooring chain after above thermal treatment are in table 2.
The melting chemical composition mass percent (wt%) of table 1 R4 mooring chain steel
Performance index after the thermal treatment of table 2 R4 mooring chain
Performance index after the thermal treatment of continued 2 R4 mooring chain
| Sequence number | Corrosion fatigue limit/MPa | R p0.2/R m | Autstenitic grain size/level | Tissue |
| 1 | 212 | 0.82 | 9.5 | Tempered sorbite+bainite |
| 2 | 203 | 0.82 | 10.0 | Tempered sorbite+bainite |
| 3 | 197 | 0.81 | 10.0 | Tempered sorbite+bainite |
| 4 | 215 | 0.82 | 9.5 | Tempered sorbite+bainite |
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or directly apply to other occasion, all within protection scope of the present invention without improving.
Claims (9)
1., containing a niobium R4 mooring chain steel, it is characterized in that, according to mass percent containing, for example lower component: C:0.26 ~ 0.31, Si:0.15 ~ 0.40, Mn:0.60 ~ 0.90, P :≤0.010, S :≤0.005, Cr:1.00 ~ 1.20, Mo:0.20 ~ 0.30, Ni:0.50 ~ 0.80, Nb:0.055 ~ 0.075, Ti:0.010 ~ 0.030, Cu:0.25 ~ 0.40, B:0.0008 ~ 0.0030, Als:0.015 ~ 0.050, all the other are iron and remaining trace impurity.
2., as claimed in claim 1 containing the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, comprise the steps:
(1) quench: mooring chain steel is heated to temperature 900 ~ 950 DEG C, calculate by 1.5 ~ 2.0min/mm in this temperature section heating and thermal insulation time, cooling.
(2) tempering: mooring chain steel is heated to temperature 600 ~ 650 DEG C, calculated by 2 ~ 2.5min/mm in this temperature section heating and thermal insulation time, cooling.
3. as claimed in claim 2 containing the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, the rate of heating in step (1) and/or (2) is 50 ~ 100 DEG C/h.
4. as described in Claims 2 or 3, contain the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, in step (1), water-cooled is to room temperature.
5. according to any one of claim 2-4, contain the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, step (2) hollow cold is to room temperature.
6. according to any one of claim 2-5, contain the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, in step (1), be heated to temperature 930 DEG C with 80 DEG C/h, heating and thermal insulation time 270min, water-cooled.
7. according to any one of claim 2-6, contain the thermal treatment process of niobium R4 mooring chain steel, it is characterized in that, in step (2), be heated to temperature 620 DEG C with 80 DEG C/h, heating and thermal insulation time 420min, air cooling.
8., as claimed in claim 1 containing the production method of niobium R4 mooring chain steel, it is characterized in that, comprise the steps:
A. electric arc furnace or converter smelting;
The refining of b.LF stove;
C.RH or VD vacuum outgas;
D. continuous casting;
E. strand process furnace heating;
F. round rolling;
G. mooring chain forging;
H. Tempering and Quenching.
9. the production method containing niobium R4 mooring chain steel as claimed in claim 8, it is characterized in that, thermal treatment comprises the steps:
(1) quench: mooring chain steel is heated to temperature 900 ~ 950 DEG C, calculate by 1.5 ~ 2.0min/mm in this temperature section heating and thermal insulation time, cooling.
(2) tempering: mooring chain steel is heated to temperature 600 ~ 650 DEG C, calculated by 2 ~ 2.5min/mm in this temperature section heating and thermal insulation time, cooling.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636928A (en) * | 2016-11-12 | 2017-05-10 | 殷匠 | Offshore mooring chain steel and thermal treatment method for mooring chain |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN112011727A (en) * | 2019-05-28 | 2020-12-01 | 宝山钢铁股份有限公司 | Ultrahigh-strength low-temperature-toughness steel, ultrahigh-strength low-temperature-toughness bar and manufacturing method thereof |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
| WO2023160613A1 (en) * | 2022-02-23 | 2023-08-31 | 上海茵矩材料科技有限公司 | Mooring chain steel and production method therefor, and mooring chain and production method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106636928A (en) * | 2016-11-12 | 2017-05-10 | 殷匠 | Offshore mooring chain steel and thermal treatment method for mooring chain |
| CN107254624A (en) * | 2017-06-01 | 2017-10-17 | 马鞍山钢铁股份有限公司 | A kind of diameter 90mm above Big sized gear steel and its production method |
| CN112011727A (en) * | 2019-05-28 | 2020-12-01 | 宝山钢铁股份有限公司 | Ultrahigh-strength low-temperature-toughness steel, ultrahigh-strength low-temperature-toughness bar and manufacturing method thereof |
| CN114369759A (en) * | 2021-12-20 | 2022-04-19 | 江苏亚星锚链股份有限公司 | Low temperature resistant anchor chain |
| WO2023160613A1 (en) * | 2022-02-23 | 2023-08-31 | 上海茵矩材料科技有限公司 | Mooring chain steel and production method therefor, and mooring chain and production method therefor |
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| CN104962832B (en) | 2017-08-22 |
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