CN104962832B - One kind R4 containing niobium mooring chain steels and its Technology for Heating Processing and production method - Google Patents
One kind R4 containing niobium mooring chain steels and its Technology for Heating Processing and production method Download PDFInfo
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Abstract
The present invention relates to one kind R4 containing niobium mooring chain steels and its Technology for Heating Processing and production method, contain following component according to mass percent：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, remaining is iron and remaining trace impurity.Technology for Heating Processing comprises the following steps：(1) quench：Mooring chain steel is heated to 900~950 DEG C of temperature, is calculated in the temperature section heating and thermal insulation time by 1.5~2.0min/mm, cooling.(2) it is tempered：Mooring chain steel is heated to 600~650 DEG C of temperature, is calculated in the temperature section heating and thermal insulation time by 2~2.5min/mm, cooling.The present invention have developed R4 mooring chain steels, significantly improve quenching degree, corrosion resistance, fatigue resistance and the low-temperature flexibility of R4 mooring chain steels.
Description
Technical field
The present invention relates to big specification R4 mooring chain steels and its Technology for Heating Processing, and in particular to one kind R4 containing niobium mooring cables are used
Steel and its Technology for Heating Processing and production method.
Background technology
Mooring cable product is mainly used in offshore oil, natural gas extraction floating production system, semisubmersible drilling platform, list
Point mooring structure and floating production storage unit ship and other ocean development facilities etc., its product quality be related to operation on the sea and
The security of ship's navigation.Due to mooring cable long period of soaking in the seawater, inclement condition, therefore it is required that mooring chain steel is not only strong
Degree is high, good toughness, and it is also desirable to have the characteristic such as seawater corrosion resistance, antifatigue destruction, wear-resistant.According to the intensity water used
Flat difference, mooring cable product mainly has R3, R3S, R4, R4S, R5 grades etc..
In recent years, with the exploitation that deep-sea is recovered the oil, explored, to deep-sea oil recovery, exploring equipment high intensity, big specification mooring
The demand of chain (Ф 90mm~Ф 210mm) gradually increases.Due to the big quenched cooling difficulty of specification mooring cable product, cause mooring cable
Total cross-section whole through hardening is difficult, at present, and countries in the world R4 grades big specification mooring chain steel product is (big into offshoot program using high alloy
Cause as 0.22C-1.4Mn-1.3Cr-1.2Ni-0.5Mo), to improve its quenching degree, adjusted so as to meet big specification mooring cable product
High intensity, high tenacity, fatigue proof requirement after matter, but there is following defect in it：
(1) because alloying element content is high, material rolled is caused to be organized as half martensite tissue, material must before delivery
It must be made annealing treatment, otherwise material can produce martensite transfor mation in placement process, structural stress be produced, so as to cause material
There is internal fissure to scrap.
(2) because the alloying element contents such as Mn, Cr, Mo are high, the weldability of steel can be deteriorated, the generation for increasing weld crack is general
Rate.
(3) because alloying element content is high, the risk of mooring cable hardening break is improved, and yield tensile ratio also tends to not conform to
Lattice (>0.92).
(4) production cost is added.
The content of the invention
It is an object of the invention to provide one kind R4 containing niobium mooring chain steels and its Technology for Heating Processing and production method, utilize
Micro Nb, Ti, B and a small amount of Ni, Cu, Mo, Cr, Mn composite alloying principle, with reference to optimization of Heat Treatment Process, in reduction production
On the premise of cost, quenching degree, corrosion resistance, fatigue resistance and the low-temperature flexibility of R4 mooring chain steels, Jin Erxian are significantly improved
Overall performance uniformity, life-span and the security for improving R4 mooring chain steels are write, so as to produce the R4 systems of low-cost and high-performance
Moor chain steel.Concrete technical scheme is as follows：
One kind mooring chain steels of R4 containing niobium, contain following component according to mass percent：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, remaining is iron and remaining trace impurity.
The Technology for Heating Processing of the above-mentioned mooring chain steels of R4 containing niobium, comprises the following steps：
(1) quench：Mooring chain steel is heated to 900~950 DEG C of temperature, the temperature section heating and thermal insulation time by 1.5~
2.0min/mm is calculated, cooling.
(2) it is tempered：Mooring chain steel is heated to 600~650 DEG C of temperature, the temperature section heating and thermal insulation time by 2~
2.5min/mm is calculated, cooling.
Further, the firing rate in step (1) and/or (2) is 50~100 DEG C/h.
Further, step (1) reclaimed water is cooled to room temperature.
Further, step (2) is hollow is cooled to room temperature.
Further, 930 DEG C of temperature, heating and thermal insulation time 270min, water cooling are heated to 80 DEG C/h in step (1).
Further, 620 DEG C of temperature, heating and thermal insulation time 420min, air cooling are heated to 80 DEG C/h in step (2).
The production method of the above-mentioned mooring chain steels of R4 containing niobium, further, comprises the following steps：
A. electric arc furnaces or converter smelting；
B.LF stoves are refined；
C.RH or VD vacuum outgas；
D. continuous casting；
E. heating strand stove heat；
F. round rolling；
G. mooring cable is forged；
H. Tempering and Quenching.
Further, heat treatment comprises the following steps：
(1) quench：Mooring chain steel is heated to 900~950 DEG C of temperature, the temperature section heating and thermal insulation time by 1.5~
2.0min/mm is calculated, cooling.
(2) it is tempered：Mooring chain steel is heated to 600~650 DEG C of temperature, the temperature section heating and thermal insulation time by 2~
2.5min/mm is calculated, cooling.
Compared with currently available technology, the present invention is compound by using micro Nb, Ti, B and a small amount of Ni, Cu, Mo, Cr, Mn
Alloying principle, with reference to optimization of Heat Treatment Process, with refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, obtains having
The structural state of even and fine close sorbite+lower bainite metallographic structure, have developed R4 mooring chain steels, significantly improves R4 mooring cables
With the quenching degree of steel, corrosion resistance, fatigue resistance and low-temperature flexibility, and then it is uniform to significantly improve the overall performance of R4 mooring cables
Property, life-span and security, so as to produce the R4 mooring cables of low-cost and high-performance.The product of technology production fully meets phase
The requirement of pass standard, enhances the competitiveness of enterprise.
Embodiment
Below according to accompanying drawing, the present invention will be described in detail, and it is a kind of preferred reality in numerous embodiments of the present invention
Apply example.
In a preferred embodiment there is provided one kind R4 containing niobium mooring chain steels and its Technology for Heating Processing, the moorings of R4 containing niobium
Chain is with the mass percent (wt%) of steel chemical composition：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, remaining is
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 intensified element and improves quenching degree element, but the drop of the too high plasticity and toughness that can cause steel of C
Low, welding performance deteriorates.To ensure plasticity, toughness and the welding performance of steel, C content is unsuitable too high, and the intensity of loss is then by it
Its alloying element and microalloy element make up.Consider, the C content scopes of R4 mooring chain steels should 0.26%~
0.31% is advisable.
(2) silicon：Si is the most obvious element of solution strengthening effect, while being also to the maximum element of loss in toughness.From comprehensive
Close performance to consider, Si do not used as main intensified element, therefore the control of Si contents is in general relatively low level, with no more than
0.4% is advisable, and scope is considered 0.15%~0.40%.
(3) manganese：Mn mainly plays solution strengthening and improves quenching degree.But Mn is also easy to produce component segregation, influence tissue and
The uniformity of performance.Particularly Mn contents are higher, can increase martensite content in tissue, so as to improve yield tensile ratio, cause to bend strong
Than exceeded.Therefore R4 mooring chain steels of the present invention design Mn contents are no more than 1.0% to be advisable, range-controllable system 0.60%~
0.90%.
(4) chromium：Cr can increase the quenching degree of steel, promote to obtain more uniform in workpiece whole cross section after quenching and tempering
Tissue.But its too high levels, can deteriorate the weldability of mooring chain steel.Consider, Cr range-controllable systems 1.00%~
1.20%.
(5) molybdenum：Mo can significantly improve the quenching degree and heat resistance of steel, prevent temper brittleness；Meanwhile, Mo can make steel
Crystal grain refinement, improves the obdurability of steel, but Mo cost is higher, and its too high levels can also deteriorate the welding performance of steel.It is comprehensive
Close and consider, range-controllable system is 0.20%~0.30%.
(6) nickel：Ni has the tissue of refinement steel, the effect of the cryogenic property of improvement steel, and is quenched with solution strengthening, raising
Permeability is acted on, but its is expensive, and Ni also improves one of element of steel yield tensile ratio, considers, and range-controllable system exists
0.50~0.80%.
(7) copper：Copper is the element for expanding austenite phase field, but the solid solubility in iron is less, and copper does not form carbonization with carbon
Thing.Copper is stabilization of austenite element, can improve the quenching degree of steel, be organized after refinement transformation, so as to improve the low-temperature flexibility of steel.
And solubility of the copper in a-Fe can drastically decline with the reduction of temperature, can play a part of precipitation strength, copper is to facing
Boundary's temperature and the influence of quenching degree and its solution strengthening effect are similar to nickel, can be used to replace a part of nickel, to reduce production
Cost.Meanwhile, addition copper can also improve the anti-fatigue performance of steel in steel, because tiny Cu precipitations have blocked the initial stage of fatigue
The formation of stage vein texture, and copper precipitate has good plasticity, can hinder the extension of fatigue crack, so as to improve steel
Fatigue strength；In addition, Cu also increases significantly, steel corrosion resistance is acted on, and it is that to be remarkably improved its resistance to that 0.1%Cu is added in steel
Corrosion.But Cu too high levels, steel easily causes hot-short in heating rolling or forging process.Consider, range-controllable system exists
0.25~0.40%.
(8) niobium：Nb is mainly shown as crystal grain refinement, precipitation strength and phase transformation strengthening to the Strengthening and Toughening effect of mooring chain steel.
Nb is to replace solute atoms presence in steel, and Nb atomic ratio iron atoms size is big, and the segregation easily on dislocation line is produced to dislocation climb
Raw strong effect of dragging, is suppressed Recrystallization nucleation, has strong interception to recrystallization, improves austenite
Recrystallization temperature, so as to reach the purpose of fining austenite grains, crystal grain refinement can not only improve the obdurability of steel, and
Improve the cryogenic property of steel.Meanwhile, by the precipitation strength of its carbonitride, also it is remarkably improved the intensity of steel.But its valency
Lattice are expensive.Consider, Nb range-controllable system is 0.055%~0.075%.
(9) titanium：Tiny alloying element Ti is added in steel can play solid solution, segregation and precipitation, when they and carbon, nitrogen,
The Interaction Energies such as sulphur produce refined crystalline strengthening, precipitate dispersion-strengtherning and inclusion conditioning etc., add the intensity and toughness of steel
By force, and can improve steel belt roof bolt stability, improve steel welding performance.Consider, Ti range-controllable system 0.015%~
0.030%.
(10) boron：When containing micro (0.0008~0.0030%) boron in steel, the quenching degree of steel can be significantly improved,
For the medium carbon structural alloy steel that C content is 0.26~0.31%, plus its maximum through hardening diameter can improve more than 50% after boron.It is right
, there is the problem of quenching impermeable in the alloy mooring chain steel in heavy in section, cause big specification mooring cable section microscopic structure and performance
It is uneven, it have impact on the overall performance index of mooring cable, it is therefore desirable to further improve its quenching degree by boron alloyed.Together
When, boron alloyed cost is low, and boron influences very little to the quenching crack susceptibility of steel.
Big specification R4 containing the niobium mooring chain steels technological process of production of the present embodiment is：Electric arc furnaces or converter smelting → LF stoves essence
Refining → RH or VD vacuum outgas → continuous casting → heating strand stove heat → round rolling → mooring cable forging → Tempering and Quenching.
The crucial Technology for Heating Processing step of the present embodiment is as follows：
(1) quench：Mooring chain steel heating (firing rate be 50~100 DEG C/h) is to 900~950 DEG C of temperature, in the temperature
The section heating and thermal insulation time is spent by 1.5~2.0min/mm calculating, then carries out water cooling to room temperature.
(2) it is tempered：Mooring chain steel heating (firing rate be 50~100 DEG C/h) is to 600~650 DEG C of temperature, in the temperature
The section heating and thermal insulation time is spent by 2~2.5min/mm calculating, is then air-cooled to room temperature.By tempering, uniform fine and closely woven tempering can be obtained
The metallographic structure of sorbite+lower bainite, so as to obtain good toughness plasticity and suitable intensity index.
Using the R4 mooring chain steels of the chemical composition of the present invention, technological process and the production of Technology for Heating Processing technological parameter,
The vertical mixing coefficient for determining steel can reach：Rm>=860MPa, Rp0.2>=580MPa, Rp0.2/Rm≤ 0.92, A >=12%, Z >=
50%, -40 DEG C of impact absorbing energy KV2>=50J, corrosion fatigue limit >=190MPa, hydrogen embrittlement performance Z1/Z2 >=0.85 is (in formula：
Z1 --- the contraction percentage of area of not baked sample；Z2 --- the contraction percentage of area of baked sample), the austenite crystal of steel
Degree is more than or equal to 8.0 grades.Steel is organized as tempered sorbite+bayesian after R4 mooring cables quenched (quenching+high tempering) heat treatment
Body, wherein, mooring cable near surface tempered sorbite content tempered sorbite content about at 90~100%, the radius of mooring cable 1/2
About 50~70%.
In a preferred embodiment, the melting chemical composition of R4 mooring chain steels, main heat treatment process parameter and property
The embodiment of energy is as follows：
Technology for Heating Processing step and parameter are：
(1) quench：930 DEG C of temperature, heating and thermal insulation time 270min, water cooling are heated to 80 DEG C/h.
(2) it is tempered：620 DEG C of temperature, heating and thermal insulation time 420min, air cooling are heated to 80 DEG C/h.
A diameter of Φ 200mm R4 mooring chain steel melting chemical composition mass percents (wt%) are shown in Table 1, R4 mooring cables
Performance indications after being heat-treated more than are shown in Table 2.
The melting chemical composition mass percent (wt%) of the R4 mooring chain steels of table 1
Performance indications after the heat treatment of the R4 mooring cables of table 2
Performance indications after the heat treatment of the R4 mooring cables of continued 2
| Sequence number | Corrosion fatigue limit/MPa | Rp0.2/Rm | 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 |
The present invention is exemplarily described above in conjunction with accompanying drawing, it is clear that the present invention is implemented not by aforesaid way
Limitation, as long as employ the inventive concept and technical scheme of the present invention progress various improvement, or it is not improved directly apply
In other occasions, within protection scope of the present invention.
Claims (8)
1. one kind mooring chain steels of R4 containing niobium, it is characterised in that contain following component according to mass percent：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, remaining is iron and remaining trace impurity；The heat treatment of the mooring chain steels of R4 containing niobium
Technique comprises the following steps：
(1) quench：Mooring chain steel is heated to 900~950 DEG C of temperature, the temperature section heating and thermal insulation time by 1.5~
2.0min/mm is calculated, cooling,
(2) it is tempered：Mooring chain steel is heated to 600~650 DEG C of temperature, and 2~2.5min/ is pressed in the temperature section heating and thermal insulation time
Mm is calculated, cooling.
2. the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that the step of the Technology for Heating Processing (1) and/or
(2) firing rate in is 50~100 DEG C/h.
3. the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that step (1) reclaimed water is cooled to room temperature.
4. the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that step (2) is hollow to be cooled to room temperature.
5. the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that step is heated to temperature in (1) with 80 DEG C/h
930 DEG C, heating and thermal insulation time 270min, water cooling.
6. the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that step is heated to temperature in (2) with 80 DEG C/h
620 DEG C, heating and thermal insulation time 420min, air cooling.
7. a kind of production method of the mooring chain steels of R4 containing niobium as claimed in claim 1, it is characterised in that comprise the following steps：
A. electric arc furnaces or converter smelting；
B.LF stoves are refined；
C.RH or VD vacuum outgas；
D. continuous casting；
E. heating strand stove heat；
F. round rolling；
G. mooring cable is forged；
H. Tempering and Quenching.
8. the production method of the mooring chain steels of R4 containing niobium as claimed in claim 7, it is characterised in that heat treatment includes following step
Suddenly：
(1) quench：Mooring chain steel is heated to 900~950 DEG C of temperature, the temperature section heating and thermal insulation time by 1.5~
2.0min/mm is calculated, cooling,
(2) it is tempered：Mooring chain steel is heated to 600~650 DEG C of temperature, and 2~2.5min/ is pressed in the temperature section heating and thermal insulation time
Mm is calculated, cooling.
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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 |
| CN107254624B (en) * | 2017-06-01 | 2019-03-19 | 马鞍山钢铁股份有限公司 | A kind of above Big sized gear steel of diameter 90mm 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 |
| CN114438420A (en) * | 2022-02-23 | 2022-05-06 | 上海茵矩材料科技有限公司 | Mooring chain steel and production process thereof, and mooring chain and production process thereof |
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