CN101875059A - Method for manufacturing 1,860MPa ultrahigh strength hotly-galvanized steel wire with diameter of 5.0 millimeters - Google Patents
Method for manufacturing 1,860MPa ultrahigh strength hotly-galvanized steel wire with diameter of 5.0 millimeters Download PDFInfo
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Abstract
The invention relates to a method for manufacturing a 1,860MPa ultrahigh strength hotly-galvanized steel wire with a diameter of 5.0 millimeters. The process flow of the method is as follows: steel wire rod reinspection-surface preparation-wire drawing-hot galvanizing-stabilization treatment-examination. In the method, a Bao steel B82MnQL bridge cable special steel wire rod with a diameter of 13.5 millimeters, which meets the preset requirements on melting components and mechanical properties, is selected, scale on the surface of the steel wire rod is removed by pickling, the washed surface of the steel wire rod is phosphorized, boronized and dried, and the steel wire rod is reduced and drawn into wires of a diameter specification of a finished product by using an ultra high compression of more than 85 percent and by adopting a 'high-low' partial compression rate distribution method, the surface of the steel wire rod is hotly galvanized, the steel wire is stabilized to meet requirements for high strength and toughness of products, the drawbacks of the prior art are overcome effectively, and the manufacturing of the 1,860MPa ultrahigh strength hotly-galvanized steel wire with a diameter of 5.0 millimeters, which meets national standards, is realized to satisfy the needs of the construction of modern suspension bridges with an increasingly enlarge span.
Description
Technical field
The present invention relates to extraordinary steel wire manufacturing technology field, particularly a kind of manufacture method that is directly used in the Φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire of super large span suspension bridge main push-towing rope.
Background technology
Develop rapidly along with the bridge construction technology, the bridge construction design is striden the footpath and is constantly being increased, particularly the footpath hundreds of rice from the outset of striding of suspension bridge develops into present nearly two kms, the main bearing carrier " main push-towing rope " that is used as suspension bridge has also correspondingly experienced from initial use iron chains and has proceeded to the employing high-strength galvanized steel wire, and the intensity of zinc-coated wire has also experienced the course of having brought up to present 1770MPa from initial not enough 1000MPa.Along with the increase in suspension cable spanning footpath, to the also corresponding requirements at the higher level that proposed of intensity, so that the deadweight of control bridge main push-towing rope and the construction cost of ultra-large type bridge as the zinc-coated wire of main push-towing rope.
The used zinc-coated wire of main rope of suspension bridge is one " product that combination property is had relatively high expectations ".At present China is lower than in 2000 meters the suspension bridge construction and has begun to adopt the high strength low relaxed zinc-coated wire of Φ 7.0mm 1770MPa striding the footpath, requires further to improve intensity of steel wire, increases the steel wire consumption and improves the realistic problem of construction costs but the zinc-coated wire of this specification if be used for will certainly face increase because of load when striding on the suspension bridge in footpath more than 2000 meters.At present, having brought into use φ 5.0mm series, intensity rank in the world is the zinc-coated wire of 1770MPa, the zinc-coated wire that φ 5.0mm series, 1860MPa in French NF A35-035 standard data, have also occurred, but the zinc-coated wire of this φ 5.0mm series, 1860MPa is not seen corresponding product so far and is appeared on the market and be applied to relevant report in the bridge practice.In addition, in French NF A35-035 standard, the specification requirement that the toughness index of φ 5.0mm series, 1860MPa zinc-coated wire " is reversed " is in addition not clear and definite, and this has reduced the technical indicator of this zinc-coated wire and the complexity of production technology to a certain extent.Yet, find in practice, it is a very important technical indicator that the toughness index of zinc-coated wire " reverses ", China in " bridge cable hot-dip galvanizing steel wire " GB/T17101-2008 technical standard to the zinc-coated wire of 5.0mm series except that having increased 1860MPa intensity rank product, also toughness index " is reversed " and has proposed to be not less than 8 times requirement.Yet, be not less than 8 times toughness index requirement just because of " reversing ", brought difficulty for the manufacturing process of 5.0mm series 1860MPa intensity rank zinc-coated wire.
In the production process of zinc-coated wire, wire drawing is the basic operation of together the steel wire wire rod being pursued tube reducing, and it is not only the master operation in the production overall process, and is the critical process of decision properties of product.In this operation, at first to propose raw material specification and mechanical property requirements according to final products required intensity and toughness reguirements, determining total draught, secondly is that each passage part compression ratio is carried out reasonable distribution, determines suitable drawing speed according to status of equipment again.Zinc-coated wire for 5.0mm series 1860MPa intensity rank, because product strength is had relatively high expectations, and also have " reversing " to be not less than 8 times toughness reguirements, add the factor that intensity and loss in toughness can take place in the production process, cause the raw material requirement relatively harshly, production technology is also relatively complicated.Employed in the method for producing the high strength low relaxed zinc-coated wire of Φ 7.0mm 1770MPa at present is raw material with phosphorus content higher " high-carbon steel ", adopting the limit is the drawing process of each passage part compression ratio distribution method of 80% total draught and " high in the middle of two is low ", because it is broken that middle high part compression ratio makes metal inside strained " sheet globular cementite " tissue occur easily, cause toughness of material to wreck, thereby cause causing the adverse consequences of product strength and loss in toughness and be not suitable for being used to making with the 5.0mm of superhigh intensity and special toughness reguirements series 1860MPa superhigh intensity hot-dip galvanizing steel wire.
Summary of the invention
The objective of the invention is to solve the weak point that existing traditional handicraft is not suitable for being used to make the 5.0mm series 1860MPa superhigh intensity hot-dip galvanizing steel wire that meets the GB requirement, provide a kind of and can satisfy the product strength requirement, can satisfy the method that toughness of products requirement and part compression ratio are distributed scientific and reasonable manufacturing φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire again.
The technological process of the method for manufacturing φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire of the present invention is as follows: wire rod reinspection → surface preparation → wire drawing → galvanizing → stabilization processes → check.
At first select for use smelting component and mechanical property meet pre-provisioning request, by the φ 13.5mm of Shanghai Baosteel development, the special-purpose wire rod of B82MnQL bridge cable that strength range is 1210 ± 50MPa, and remove the iron scale on wire rod surface by the pickling mode; Then the wire rod surface after washing down is carried out that phosphatization and boronation are handled and oven dry, make the wire rod surface have the good lubrication condition and can produce good lubricated carrier function; By special-purpose wire rod being implemented the tube reducing wire drawing to the finished diameter specification greater than the method for 85% superelevation total draught and employing " preceding high back is low " distribution portion compression ratio; Steel Wire Surface is done galvanizing handle, make it to have favorable surface quality; On the production line of " two tensioning " process equipment, increase be provided with one only to Steel Wire Surface play wiping and smooth interaction and restriction steel wire diameter, " limited diameter mould " that the integral body of steel wire is not produced metamorphosis make stabilization processes to steel wire, when steel wire is applied tension force, steel wire is carried out lonneal and smooth surface processing, make steel wire when obtaining underrelaxation, also have a smooth surface, also do not influence final toughness of product and plasticity simultaneously.
Wherein: the tension force of described stabilization processes is 25%-45% nominal Fracture Force.The temperature of stabilization processes is 350-400 ℃.
Make the method for φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire based on the present invention of above-mentioned design, owing to selected for use smelting component and mechanical property to meet pre-provisioning request, φ 13.5mm by the Shanghai Baoshan Iron and Steel General Plant development, the special-purpose wire rod of B82MnQL bridge cable, at the wire drawing total draught greater than 85%, carry out wire drawing under the process conditions of part compression ratio employing " preceding high back is low " distribution method, it is good to have made full use of metal material distortion initial stage plasticity, the characteristics that deformability is bigger, just give bigger part compression ratio in the distortion beginning, later increase along with metal material distortion and hardenability, the part compression ratio reduces by the road, thereby guaranteed the combination property of material under the super large compression ratio situation, and wire rod is being pursued on the basis of road tube reducing wire drawing and cure process, after the stabilization process of " two tensioning " and " limited diameter mould " is handled, produce and have superhigh intensity simultaneously, the φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire of underrelaxation and higher toughness and plasticity, can effectively overcome and existingly in the prior art can not produce the drawback of taking into account superhigh intensity and high twisting property zinc-coated wire simultaneously, as long as select smelting component and mechanical property to meet the raw material of pre-provisioning request, in drawing process, adopt the low distribution method in preceding high back under the super large total draught, just can make to produce and meet super-strength comprehensively, the φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire that height reverses the toughness technical requirement becomes a reality, the satisfied modern times are striden the bridge construction demand that the footpath increases day by day, thereby the method that the present invention makes φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire has significant technical advance, very strong practicality and valuable economy.
The specific embodiment
The invention will be further described below in conjunction with exemplary embodiments.
The technological process of manufacturing φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire product of the present invention is as follows: wire rod reinspection → surface preparation → wire drawing → galvanizing → stabilization processes → check.
1. wire rod is reviewed
Select the special-purpose wire rod of φ 13.5mm, B82MnQL bridge cable of Shanghai Baosteel development for use, the major technique condition is as follows:
(1) smelting component:
| Leading element | ??C | ??Si | ??Mn | ??P | ??S | ??Cu | ??Cr |
| Smelting component | ??0.80-0.85 | ??0.12-0.32 | ??0.60-0.90 | ??≤0.025 | ??≤0.06 | ??≤0.20 |
(2) mechanical property: tensile strength 1210 ± 50MPa, section shrink 〉=30% (wire rod through after 14 days timeliness, 〉=35%).
(3) processing performance:
But wire rod drawing total draught is not less than 85%.
(4) surface quality:
Wire rod should be with the excision of injurous defect end to end, and the surface should be smooth, folding, the ears or side handles of a utensil of not having, scab, layering and macroscopic crackle.Allow local impression, projection, cut and pitted skin, its degree of depth or height and should be not more than 0.10mm.
(5) microscopic structure:
Wire rod should carry out the check of sorbite content, and sorbite content should be greater than 90%.Wire rod must not have quenching structure, network cementite and the tissue harmful to performance.
(6) decarburized layer deepness:
Undertaken by the GB/T224-1987 requirement, total decarburized layer (full decarburization+transition zone) should be not more than 0.07mm.
(7) non-metallic inclusion:
Wire rod non-metallic inclusion content is tested by the JISG0555-1998 standard-required, and wire rod sample analysis non-metallic inclusion content should be not more than 0.10%.
(8) grain size:
Wire rod should carry out the detection of grain size by the YB/T5148 standard, and the acceptability limit that grain size detects is the 7-9 level.
2. surperficial preparation surface is prepared
Remove the iron scale on wire rod surface by the pickling mode; Then phosphatization and boronation processing and oven dry are carried out in the wire rod surface after washing down.
Surface preparatory process technological process: wire rod → pickling → cleaning (rinsing, flushing) → phosphatization → hot water cleans → is coated with boron → oven dry → discharging
3. wire drawing
According to the product strength requirement, primary election raw material specification of the present invention is 13.5mm, strength range 1210 ± 50MPa, and the wire drawing trimmed size is a 5.0mm series.Adopting the wire drawing total draught is 86.12%, and " preceding high back is low " method is adopted in the distribution of each passage part compression ratio.
The present invention is to the basic demand of wire-drawing process:
(1) raw material of using for wire drawing should have surface of good phosphatization quality.
(2) lubricating condition in the drawing process should keep good.
(3) drawing speed should be moderate.
4. galvanizing
Zinc-plated operation is the critical process in the production overall process, and the quality control of this operation is related to the quality of the decay resistance of product on the one hand.Also galvanizing should be controlled in certain scope product strength and toughness influence on the other hand.
The present invention is to the basic demand of zinc-plated operation:
(1) has favorable surface quality.
(2) zinc-plated half-finished ovality must be controlled in the suitable scope.
5. stabilization processes
The basic principle of stabilization processes is " when steel wire is applied tension force steel wire being carried out lonneal handles ".The obtain manner of tension force has two kinds in existing stabilization processes: a kind of is to obtain (mould pulls out needs steel wire to have the deflection more than 10% just can obtain enough tension force) by the mode of " mould pulls out ", and another kind is to obtain in the mode of " two tensioning "." mould pulls out " mode equipment is simple, but to product tough, plasticity is influential; " two tensioning " mode equipment relative complex, but, plasticity not influence tough to product.Two tensioning modes that stabilization processes of the present invention adopts are produced its main technologic parameters:
Stabilization processes tension force: 25%-45% nominal Fracture Force.
Stabilization processes temperature: 350-400 ℃.
The key technical indexes of the present invention and GB GB/T17101-2008 and international advanced French NF A35-035 standard compare: see the following form.
| Sequence number | Project | ??NF?A35-035 | ??GB/T17101 | Product the key technical indexes of the present invention |
| ??1 | Nominal diameter and permissible variation (mm) | ??5.00 | ??5.00±0.06 | ??5.10±0.06 |
| ??2 | Out-of-roundness (mm) | ??- | ??≤0.06 | ??≤0.06 |
| ??3 | Tensile strength (MPa) Fracture Force (kN) | ??≥1860??≥ | ??≥1860 | ??≥1860 |
| ??4 | Yield strength (MPa) 0.1% yield force (kN) | ??≥ | ??≥1490 | ??≥1490 |
| ??5 | Percentage elongation L=250mm, the contraction percentage of area (%) | ??≥3.5??≥25 | ??≥4.0 | ??≥4.0 |
| ??6 | Alternating bending (inferior) | ??(r＝15mm)??≥5 | ??(r＝15mm)??≥5 | ??(r＝15mm)??≥5 |
| ??7 | Twine by (circle) | ??- | ??3d×8 | ??3d×8 |
| Sequence number | Project | ??NF?A35-035 | ??GB/T17101 | Product the key technical indexes of the present invention |
| ??8 | Elastic modelling quantity (GPa) | ??- | ??190～210 | ??190～210 |
| ??9 | Relaxation rate (%), initial load 0.7F me，1000h | ??≤8 | ??≤7.5 | ??≤7.5 |
| ??10 | Zinc layer weight (g/m 2) | ??190～350 | ??≥300 | ??≥300 |
| ??11 | Adhesive force (circle) | ??5d×6 | ??5d×8 | ??5d×8 |
| ??12 | Copper sulfate test (inferior), zinc-plated 60 seconds once | ??≥2 | ??≥4 | ??≥4 |
| ??13 | Nature rise (mm/m) | ??- | ??≤30 | ??≤15 |
| ??14 | Freezone rise (cm) | ??- | ??≤15 | ??≤15 |
| ??15 | Fatigue behaviour | Zinc-coated wire bears 300Mpa (upper limit stress 0.45 σ 2,000,000 times b) (category-B) do not rupture | Zinc-coated wire bears 360Mpa (upper limit stress 0.45 σ 2,000,000 times b) do not rupture | Zinc-coated wire bears 360Mpa (upper limit stress 0.45 σ 2,000,000 times b) do not rupture |
| ??16 | Reverse (circle) L=100d | ?- | ??≥8 | ??≥8 |
Claims (1)
1. method of making φ 5.0mm 1860MPa superhigh intensity hot-dip galvanizing steel wire, technological process is: wire rod reinspection → surface preparation → wire drawing → galvanizing → stabilization processes → check; Select for use smelting component and mechanical property meet pre-provisioning request, by the φ 13.5mm of Shanghai Baoshan Iron and Steel General Plant development, the special-purpose wire rod of B82MnQL bridge cable that strength range is 1210 ± 50MPa, and remove the iron scale on wire rod surface by the pickling mode; Then the wire rod surface after washing down is carried out that phosphatization and boronation are handled and oven dry, make the wire rod surface have the good lubrication condition and can produce good lubricated carrier function; By special-purpose wire rod being implemented the tube reducing wire drawing to the finished diameter specification greater than the part compression ratio distribution method of 85% superelevation total draught and employing " preceding high back is low "; Steel Wire Surface is done galvanizing handle, make it to have favorable surface quality; On the production line of " two tensioning " process equipment, increase be provided with a working range for " 0.00-0.10 " mm, only to Steel Wire Surface play wiping and smooth interaction and restriction steel wire diameter, " limited diameter mould " that the integral body of steel wire is not produced metamorphosis make stabilization processes to steel wire, when steel wire is applied tension force, steel wire is carried out lonneal and smooth surface processing, make steel wire when obtaining underrelaxation, also have a smooth surface, also do not influence final toughness of product and plasticity simultaneously; The tension force of described stabilization processes is 25%-45% nominal Fracture Force, and the temperature of stabilization processes is 350-400 ℃.
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