CN104962833B - A kind of mooring chain steel of R4 containing vanadium and its Technology for Heating Processing and production method - Google Patents
A kind of mooring chain steel of R4 containing vanadium and its Technology for Heating Processing and production method Download PDFInfo
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Abstract
The present invention relates to a kind of mooring chain steel of R4 containing vanadium 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, V：0.11～0.14, Ti：0.010～0.030, Cu：0.25～0.40, B：0.0008～0.0030, Als：0.015～0.050, [N]：0.010～0.015, remaining is ferrum and inevitable impurity.Technology for Heating Processing, comprises the steps：(1) quench：Mooring chain steel is heated to 880～930 DEG C of temperature, presses 1.5～2.0min/mm in this temperature section heating and thermal insulation time and calculates, cooling.(2) it is tempered：Mooring chain steel is heated to 600～650 DEG C of temperature, presses 2～2.5min/mm in this temperature section heating and thermal insulation time and calculates, cooling.Significantly improve quenching degree, corrosion resistance, fatigue resistance and the low-temperature flexibility of R4 mooring chain steel, and then significantly improve overall performance uniformity, life-span and the safety of R4 mooring cable, thus having produced the R4 mooring cable of low-cost and high-performance.
Description
Technical field
The present invention relates to a kind of mooring chain steel of R4 containing vanadium 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 facility etc., its product quality be related to operation on the sea and
The safety 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 seawater corrosion resistance, resisting fatigue is destroyed, the characteristic such as wear-resistant.According to the intensity water using
Flat difference, mooring cable product mainly has R3, R3S, R4, R4S, R5 level etc..
In recent years, the exploitation recovered the oil with deep-sea, explore, to deep-sea oil recovery, exploring equipment high intensity, big specification mooring
The demand of chain (Ф 90mm～Ф 210mm) is gradually increased.Due to the quenched cooling difficulty of big specification mooring cable product, lead to mooring cable
The whole through hardening of total cross-section is difficult, and at present, R4 level big specification mooring chain steel product in countries in the world all becomes offshoot program (big using high alloy
Cause as 0.22C-1.4Mn-1.3Cr-1.2Ni-0.5Mo), to improve its quenching degree, thus meet big specification mooring cable product adjusting
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 led to be organized as half martensite tissue, material must before delivery
Must being made annealing treatment, otherwise material can produce martensite transfor mation in placement process, being produced structural stress, thus leading to material
Internal fissure occurs scrap.
(2) because the alloying element contents such as Mn, Cr, Mo are high, the weldability of steel can be deteriorated, the generation increasing weld crack is general
Rate.
(3) because alloying element content is high, improve the risk of mooring cable hardening break, and yield tensile ratio also tends to not conform to
Lattice (>0.92).
(4) increased production cost.
Content of the invention
It is an object of the invention to provide a kind of mooring chain steel of R4 containing vanadium and its Technology for Heating Processing and production method, utilize
Trace V, Ti, B, nitrogen and a small amount of Ni, Cu, Mo, Cr, Mn composite alloying principle, in conjunction with to optimization of Heat Treatment Process, are reducing life
On the premise of producing cost, significantly improve quenching degree, corrosion resistance, fatigue resistance and the low-temperature flexibility of R4 mooring chain steel, and then
Significantly improve overall performance uniformity, life-span and the safety of R4 mooring chain steel, thus producing the R4 of low-cost and high-performance
Mooring chain steel.Concrete technical scheme is as follows：
A kind of mooring chain steel of R4 containing vanadium, contains 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, V：0.11～0.14, Ti：0.010～0.030, Cu：0.25～0.40, B：0.0008～0.0030, Als：0.015
～0.050, [N]：0.010～0.015, remaining is ferrum and inevitable impurity.
The Technology for Heating Processing of the above-mentioned mooring chain steel of R4 containing vanadium, comprises the steps：
(1) quench：Mooring chain steel is heated to 880～930 DEG C of temperature, this temperature section heating and thermal insulation time press 1.5～
2.0min/mm calculates, cooling.
(2) it is tempered：Mooring chain steel is heated to 600～650 DEG C of temperature, this temperature section heating and thermal insulation time press 2～
2.5min/mm calculates, cooling.
Further, the firing rate in step (1) and/or (2) is 50～100 DEG C/h.
Further, in step (1) water-cooled to room temperature.
Further, step (2) hollow is cooled to room temperature.
Further, in step (1), 910 DEG C of temperature, heating and thermal insulation time 270min, water-cooled are heated to 80 DEG C/h.
Further, in step (2), 620 DEG C of temperature, heating and thermal insulation time 420min, air cooling are heated to 80 DEG C/h.
The production method of the above-mentioned mooring chain steel of R4 containing vanadium, further, comprises the steps：
A. electric arc furnace or converter smelting；
B.LF stove refine；
C.RH or VD vacuum outgass；
D. continuous casting；
E. heating strand stove heat；
F. round rolling；
G. mooring cable forging；
H. Tempering and Quenching.
Further, heat treatment comprises the steps：
(1) quench：Mooring chain steel is heated to 880～930 DEG C of temperature, this temperature section heating and thermal insulation time press 1.5～
2.0min/mm calculates, cooling.
(2) it is tempered：Mooring chain steel is heated to 600～650 DEG C of temperature, this temperature section heating and thermal insulation time press 2～
2.5min/mm calculates, cooling.
Compared with currently available technology, the present invention passes through multiple using trace V, Ti, B, nitrogen and a small amount of Ni, Cu, Mo, Cr, Mn
Close alloying principle, in conjunction with to optimization of Heat Treatment Process, with refined crystalline strengthening, precipitation strength and phase transformation strengthening mechanism, had
Uniformly the structural state of fine and closely woven sorbite+lower bainite metallographic structure, have developed R4 mooring chain steel, significantly improves R4 mooring
The quenching degree of chain steel, corrosion resistance, fatigue resistance and low-temperature flexibility, and then it is equal to significantly improve the overall performance of R4 mooring cable
Even property, life-span and safety, thus produced the R4 mooring cable of low-cost and high-performance.The product that this technology produces fully meets
The requirement of relevant criterion, enhances the competitiveness of enterprise.
Specific embodiment
Describe the present invention below, it is one of numerous embodiments of the present invention preferred embodiment.
In a preferred embodiment, a kind of mooring chain steel of R4 containing vanadium and its Technology for Heating Processing, the mooring cable of R4 containing vanadium is used
The mass percent (wt%) of 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, V：0.11～0.14, Ti：
0.010～0.030, Cu：0.25～0.40, B：0.0008～0.0030, Als：0.015～0.050, [N]：0.010～
0.015, remaining is ferrum and remaining trace impurity.Wherein, steel of the present invention has carried out composition with polynary a small amount of alloying principle
Design：
(1) carbon：C is main intensified element and improves quenching degree element, but the fall of the too high plasticity that can cause steel of C and toughness
Low, welding performance deteriorates.For ensureing 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 are making up.Consider, the C content scope of R4 mooring chain steel should 0.26%～
0.31% is advisable.
(2) silicon：Si is the most obvious element of solution strengthening effect, is also the element maximum to loss in toughness simultaneously.From comprehensive
Close performance to consider, do not adopt Si as main intensified element, therefore Si content controls in typically relatively low level, to be less than
0.4% is advisable, and scope considers 0.15%～0.40%.
(3) manganese：Mn acts primarily as solution strengthening and improves quenching degree effect.But Mn is also easy to produce component segregation, impact tissue and
The uniformity of performance.Particularly Mn content is higher, can increase martensite content in tissue, thus improving yield tensile ratio, leads to bend by force
Than exceeded.Therefore R4 mooring chain steel of the present invention design Mn content to be advisable less than 1.0%, range-controllable system 0.60%～
0.90%.
(4) chromium：Cr can increase the quenching degree of steel, workpiece whole cross section after promoting quenching and tempering obtains more uniform
Tissue.But its too high levels, can deteriorate the weldability of mooring chain steel.Consider, Cr range-controllable system 1.00%～
1.20%.
(5) molybdenum：Mo can significantly improve quenching degree and the heat resistance of steel, prevents temper brittleness；Meanwhile, Mo can make steel
Crystal grain refinement, improves the obdurability of steel, but Mo's is relatively costly, and its too high levels also can deteriorate the welding performance of steel.Comprehensive
Close and consider, range-controllable system is 0.20%～0.30%.
(6) nickel：Ni have refinement steel tissue, improve steel cryogenic property effect, and have solution strengthening, improve quench
Permeability acts on, but it 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 expanding austenite phase field, but the solid solubility in ferrum is less, and copper and carbon do not form carbonization
Thing.Copper is stabilization of austenite element, can improve the quenching degree of steel, and refinement is organized, thus improving the low-temperature flexibility of steel after changing.
And dissolubility in a-Fe for the copper drastically can decline with the reduction of temperature, can play the effect of precipitation strength, copper is to facing
Boundary's temperature is similar to nickel with the impact of quenching degree and its solution strengthening effect, can be used to replace a part of nickel, to reduce production
Cost.Meanwhile, copper is added also can to improve the anti-fatigue performance of steel in steel, because tiny Cu precipitation has 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, thus improving steel
Fatigue strength；The steel corrosion resistance effect in addition, Cu also increases significantly, adds 0.1%Cu to be remarkably improved it in steel resistance to
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) vanadium：V is one of strong carbonitride-forming elements.Add trace V and can produce significant precipitation strength work
With simultaneously because its distinctive Grain refinement, steel being made to keep fine grain structure, thus compensate for due to precipitation strength
The plasticity brought and the loss of toughness are it is ensured that steel has good comprehensive mechanical property；Meanwhile, V can improve steel belt roof bolt
Stability, improves impact flexibility and the temper brittleness of steel simultaneously.But it is expensive.Consider, the range-controllable system of V exists
0.11%～0.14%.
(9) titanium：Add tiny alloying element Ti can play solid solution, segregation and precipitation in steel, when they with carbon, nitrogen,
The Interaction Energies such as sulfur produce refined crystalline strengthening, precipitate dispersion-strengtherning and inclusion conditioning etc., so that the intensity of steel and toughness is added
By force, and steel belt roof bolt stability can be improved, improve the welding performance of steel.Consider, the range-controllable system of Ti 0.015%～
0.030%.
(10) boron：When containing micro (0.0008～0.0030%) boron in steel, the quenching degree of steel can significantly improve,
The medium carbon structural alloy steel being 0.26～0.31% for C content, plus after boron, its maximum through hardening diameter can improve more than 50%.Right
Alloy mooring chain steel in heavy in section, there is a problem of quenching impermeable, leads to big specification mooring cable section microscopic structure and performance
Uneven, have impact on the overall performance index of mooring cable it is therefore desirable to improve its quenching degree further by boron alloyed.With
When, boron alloyed low cost, and boron affects very little to the quenching crack susceptibility of steel.
(11) nitrogen：In V-alloyed steel, nitrogen pick-up promotes precipitation in austenite, ferrite for the vanadium carbide nitride, in vanadium nitrogen steel not only
Separate out phase amount dramatically increase, and the size of precipitated phase also substantially refinement (precipitate size is more tiny, its precipitation strength act on
Stronger)；Meanwhile, in V-alloyed steel, nitrogen pick-up prevents ferrite crystal grain to grow up effectively, plays the effect of fining ferrite grains.
The two collective effect, effectively increases intensity and the toughness plasticity of steel.Consider, the range-controllable system of [N] 0.010%～
0.015%.
The big specification of the present embodiment mooring chain steel technological process of production of R4 containing vanadium is：Electric arc furnace or converter smelting → LF stove essence
Refining → RH or VD vacuum outgass → continuous casting → heating strand stove heat → round rolling → mooring cable forging → Tempering and Quenching.Close
The Technology for Heating Processing step of key is as follows：
(1) quench：Mooring chain steel heating (firing rate be 50～100 DEG C/h) to 880～930 DEG C of temperature, in this temperature
The degree section heating and thermal insulation time presses 1.5～2.0min/mm and calculates, and subsequently carries out water-cooled to room temperature.
(2) it is tempered：Mooring chain steel heating (firing rate be 50～100 DEG C/h) to 600～650 DEG C of temperature, in this temperature
The degree section heating and thermal insulation time presses 2～2.5min/mm and calculates, and is subsequently air cooled to room temperature.Through tempering, uniformly fine and closely woven tempering can be obtained
The metallographic structure of sorbite+lower bainite, thus good toughness plasticity and suitable intensity index can be obtained.
The R4 mooring chain steel being produced using the chemical composition of the present invention, technological process and Technology for Heating Processing technological parameter,
The vertical mixing coefficient measuring 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：
The contraction percentage of area of the not baked sample of Z1；The contraction percentage of area of the baked sample of Z2), the austenite crystal of steel
Degree is more than or equal to 8.0 grades.After R4 mooring cable quenched (quenching+high tempering) heat treatment, steel is organized as tempered sorbite+bayesian
Body, wherein, mooring cable near surface tempered sorbite content about 90～100%, tempered sorbite content at mooring cable 1/2 radius
About 50～70%.
Present invention R4 containing the vanadium mooring chain steel technological process of production is：Electric arc furnace or converter smelting → LF stove refine → RH or
VD vacuum outgass → continuous casting → heating strand stove heat → round rolling → mooring cable forging → Tempering and Quenching.
The enforcement of the melting chemical composition, main heat treatment process parameter and performance of R4 mooring chain steel of the present invention is for example
Under：
Technology for Heating Processing step and parameter are：
(1) quench：910 DEG C of temperature, heating and thermal insulation time 270min, water-cooled 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.
R4 mooring chain steel melting chemical composition mass percent (wt%) of a diameter of Φ 200mm is shown in Table 1, R4 mooring cable
Performance indications after above heat treatment are shown in Table 2.
The melting chemical composition mass percent (wt%) of table 1 R4 mooring chain steel
Performance indications after table 2 R4 mooring cable heat treatment
Performance indications after continued 2 R4 mooring cable heat treatment
| Sequence number | Corrosion fatigue limit/MPa | Rp0.2/Rm | Autstenitic grain size/level | Tissue |
| 1 | 210 | 0.81 | 10.0 | Tempered sorbite+bainite |
| 2 | 192 | 0.80 | 9.5 | Tempered sorbite+bainite |
| 3 | 201 | 0.81 | 9.0 | Tempered sorbite+bainite |
| 4 | 199 | 0.82 | 9.5 | Tempered sorbite+bainite |
Above the present invention is exemplarily described it is clear that the present invention implements is not subject to the restrictions described above,
As long as employing method of the present invention design and the various improvement that carry out of technical scheme, or not improved directly apply to other fields
Close, all within protection scope of the present invention.
Claims (7)
1. a kind of Technology for Heating Processing of the mooring chain steel of R4 containing vanadium is it is characterised in that the mooring chain steel of R4 containing vanadium is according to quality hundred
Divide ratio containing following 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, V：0.11～0.14, Ti：0.010～0.030,
Cu：0.25～0.40, B：0.0008～0.0030, Als：0.015～0.050, [N]：0.010～0.015, remaining is ferrum and not
Impurity can be avoided, its heat treatment comprises the steps：
(1) quench：Mooring chain steel is heated to 880～930 DEG C of temperature, this temperature section heating and thermal insulation time press 1.5～
2.0min/mm calculates, cooling；
(2) it is tempered：Mooring chain steel is heated to 600～650 DEG C of temperature, this temperature section heating and thermal insulation time press 2～
2.5min/mm calculates, cooling.
2. as claimed in claim 1 the Technology for Heating Processing of the mooring chain steel of R4 containing vanadium it is characterised in that step (1) and/or (2)
In firing rate be 50～100 DEG C/h.
3. as claimed in claim 2 the Technology for Heating Processing of the mooring chain steel of R4 containing vanadium it is characterised in that in step (1) water-cooled is extremely
Room temperature.
4. the Technology for Heating Processing of the mooring chain steel of R4 containing vanadium as claimed in claim 3 is it is characterised in that step (2) hollow is cooled to
Room temperature.
5. as claimed in claim 4 the mooring chain steel of R4 containing vanadium Technology for Heating Processing it is characterised in that in step (1) with 80 DEG C/
H is heated to 910 DEG C of temperature, heating and thermal insulation time 270min, water-cooled.
6. as claimed in claim 5 the mooring chain steel of R4 containing vanadium Technology for Heating Processing it is characterised in that in step (2) with 80 DEG C/
H is heated to 620 DEG C of temperature, heating and thermal insulation time 420min, air cooling.
7. the production method of the mooring chain steel of R4 containing vanadium as claimed in claim 1 is it is characterised in that comprise the steps：
A. electric arc furnace or converter smelting；
B.LF stove refine；
C.RH or VD vacuum outgass；
D. continuous casting；
E. heating strand stove heat；
F. round rolling；
G. mooring cable forging；
H. Tempering and Quenching, using Technology for Heating Processing as claimed in claim 1.
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| CN106521356B (en) * | 2016-11-10 | 2017-12-29 | 钢铁研究总院 | A kind of high-intensity high-tenacity corrosion-resistant chain steel and its heat treatment method |
| CN107420485A (en) * | 2017-06-21 | 2017-12-01 | 苏州顺革智能科技有限公司 | A kind of wear-resisting durable high-strength chain |
| CN107314081A (en) * | 2017-09-05 | 2017-11-03 | 苏州顺革智能科技有限公司 | A kind of durable chain of high yield tension |
| CN107649843B (en) * | 2017-11-16 | 2020-08-18 | 江苏亚星锚链股份有限公司 | Manufacturing process of high-strength low-magnetic anchor chain |
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| CN101781698A (en) * | 2009-10-27 | 2010-07-21 | 中国海洋石油总公司 | Thermal treatment process of R5 mooring chain |
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