CN101787493A - Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof - Google Patents
Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof Download PDFInfo
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Abstract
The invention relates to novel high-strength, fatigue-resistant and non-decarburized alloy spring steel, which comprises the following chemical components by weight percentage: 0.56-0.64 percent of C, 0.80-1.10 percent of Si, 0.80-1.20 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, 0.80-1.20 percent of Cr, 0.60-1.00 percent of Mo, 0.20-0.30 percent of V, 0.05-0.12 percent of Nb, 0.01-0.06 percent of N, 0.02-0.07 percent of RE, and the balance of Fe. The invention also relates to a preparation method of the alloy spring steel and a steel wire thereof. The surface of the alloy spring steel of the invention has no decarburization, cracking or other defects. Moreover, compared with the prior art, the tensile strength, the fatigue life and other performances of the alloy spring steel are all improved significantly.
Description
Technical field
The present invention relates to a kind of alloy spring steel, be in particular a kind of high-strength, fatigue-resistant and non-decarburized alloy spring steel and steel wire thereof, and their preparation method.Described alloy spring steel is mainly used in makes high-end gasoline quenching-tempering valve spring steel wire or bearing spring steel wire etc., belongs to the metal products field of new.
Background technology
In recent years, the Domestic Automotive Industry develop rapidly, the automobile volume of production and marketing had all broken through 1,360 ten thousand high pointes in 2009, surpass the U.S., the rank whole world first, annual gasoline Q-tempering alloy spring steel surpasses 150,000 tons, and selected grade of steel is the trades mark such as 60Si2MnA, 55SiCrA, 50CrVA, 67CrVA substantially.
But, because it is unreasonable and purity is relatively poor that China is used to make the spring steel chemical composition design of oil quenching tempering spring wire, the existence of bigger particulate inclusions is arranged, category-B and the indeformable hard inclusions of D class greater than 15 μ m often appear in the steel, therefore spring fatigue life reduces greatly, do not satisfy requirement fatigue lifetime of high-end automobile, so homemade high-end gasoline Q-tempering spring wire is to adopt from Sweden, Japanese import spring wire substantially, and homemade spring wire is used to make low and middle-grade domestic automobile springs substantially.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention has designed a kind of novel high-strength, fatigue-resistant and non-decarburized alloy spring steel, and innovate from aspects such as smelting technology, wire rod production, steel wire manufacturings, thereby reach high-end motor spring wire technique condition, to satisfy customer requirements, import substitution is realized auto parts machinery production domesticization requirement.
The purpose of this invention is to provide a kind of high-strength, fatigue-resistant and non-decarburized alloy spring steel, it comprises following chemical components in mass percent: C 0.56%～0.64%, Si 0.80%～1.10%, Mn 0.80%～1.20%, P≤0.035%, S≤0.03%, Cr 0.80%～1.20%, Mo0.60%～1.00%, V 0.20%～0.30%, Nb 0.05%～0.12%, N 0.01%～0.06%, RE 0.02%～0.07%, surplus is Fe, also may contain a small amount of unavoidable impurities.The grade of steel of described alloy spring steel is 60SiCrMoVNbNRE.
Preferably, described alloy spring steel comprises following chemical components in mass percent: C0.58%～0.62%, Si 0.90%～1.10%, Mn 0.90%～1.10%, P≤0.020%, S≤0.020%, Cr 0.90%～1.20%, Mo 0.80%～1.00%, V 0.20%～0.26%, Nb 0.06%～0.11%, N 0.02%～0.05%, RE 0.03%～0.06%, and surplus is Fe.
Wherein, the mass ratio of [Nb+V]/[N] is 8～10;
The mass ratio of [RE]/[S] is 3～4.
A further object of the present invention provides the preparation method of described high-strength, fatigue-resistant and non-decarburized alloy spring steel, and it comprises the steps:
------------------continuous casting strips off the skin hot metal pretreatment---heating---the cold φ 5.5～20mm of tandem rolling control wire rod---take-up in flaw detection in flame cleaning in external refining in converter.
Wherein, do not comprise flaw detection and the step that strips off the skin in the technological process of production of low side motor spring steel.
The concrete steps of the technological process of production of high-end motor spring steel are as follows:
1) adopts ordinary method to carry out hot metal pretreatment,, enter converter steelmaking then to reach the purpose of dephosphorization, desiliconization, desulfurization;
2) molten iron, steel scrap and slag former are adopted in converter steelmaking, preferred calcium oxide of described slag former or fluorite, the effect of converter steelmaking mainly is de-carbon and adjusts liquid steel temperature, when the content of carbon in the molten steel reach 1.00～1.10%, when temperature reaches 1550 ℃～1570 ℃, change refining furnace over to, preferably carry out refining with VAD;
3) adopt iron sheet to wrap up various ferroalloy powdeies respectively, add the Mo-Fe alloy oxidation period in external refining and carry out alloying; At the external refining reduction period, when liquid steel temperature reaches 1550 ℃～1590 ℃, adopt the Mn-Si iron alloy to carry out pre-deoxidation earlier, adopt the Si-Ca powder to carry out final deoxygenation again, add ferrochrome, ferro-vanadium and ferrocolumbium then, make V, Nb, N reach the chemical ingredients composition requirement of described alloy spring steel in reduction period nitrogen blowing in steel to increase the N amount, the ratio of control [Nb+V]/[N] is 8～10 simultaneously; Add the RE alloy at last and carry out alloying in steel, the add-on of RE is decided on [S] content in the steel, and the ratio of control [RE]/[S] is 3～4, makes [RE] content of final steel reach 0.02%～0.07%; When various chemical ingredientss reached prescribed value in the steel, liquid steel temperature reached 1590 ℃～1600 ℃ tappings and goes into ladle;
4) continuous casting, preferred continuous casting is a bloom, for example 300mm * 400mm square billet carries out the flame cleaning surface then; And detect a flaw and strip off the skin, remove surface imperfection;
5) the bloom Heating temperature is 1230～1270 ℃, and the cold temperature of tandem rolling control is 980～1020 ℃, and finishing temperature is 940～960 ℃;
6) the wire rod production total coefficient of elongation is 10, and the passage coefficient of extension is 1.1～1.15, rolls into φ 5.5mm～20mm wire rod at last.
Another object of the present invention provides the preparation method of the steel wire of described high-strength, fatigue-resistant and non-decarburized alloy spring steel, and preparing φ 2.0mm steel wire with φ 5.5mm wire rod is example, comprises the steps:
------mechanical descaling strips off the skin φ 5.5mm wire rod unwrapping wire---retractable cable---thermal treatment---retractable cable------retractable cable---gas shield heating---oil quenching---tempering---flaw detection---take-up that is drawn into φ 2.0mm.
Wherein, do not comprise the step that strips off the skin and detect a flaw in the production of low side motor spring steel wire.
The concrete steps of high-end motor spring Production for Steel Wire are as follows:
1)---aligning---------cutting---inverted take-up that enters slicing mould that bending is peeled off that carry out mechanical descaling and stripping off the skin behind the φ 5.5mm wire rod unwrapping wire, its technological process is: the wire rod unwrapping wire;
2) described stripping off the skin is to adopt slicing mould that the mode of described wire rod scraping is carried out, the degree of depth is 0.10～0.15mm, and the steel wire movement velocity is 140～200m/min, is generally 140～160m/min, can reach 200m/min, the steel that scrapes off is simultaneously cut and is adopted rotating knife to cut off recovery; The purpose that strips off the skin is that the nearly surperficial injurous defect of wire rod such as crackle, scuffing, pit, Decarburized layer and inclusion etc. are removed, and makes its smooth surface zero defect, produces no decarburization and free of surface defects spring wire;
3) must be after wire rod strips off the skin through just carrying out drawing after gas shield patenting or the annealing thermal treatment, because there is hardened layer on wire rod surface in the process of stripping off the skin, form martensitic stucture easily, must eliminate by heat treated step, otherwise can not carry out follow-up steps such as drawn steel wire, this is one of gordian technique of the present invention; Described thermal treatment is meant annealing or patenting processing; Thermal treatment temp is 870～930 ℃, DV value 20～30 (D refers to steel wire diameter, and V refers to travelling speed m/min), and the thermal treatment furnace superintendent is 12m; Quenchant is plumbous, and plumbous temperature is 550～640 ℃;
4) steel wire is in φ 600 straight drawing machine drawings 8 passages after the thermal treatment, and total draft is 85.2%, and the passage draft is 15～20%, is drawn into φ 2.0mm steel wire;
5) φ 2.0mm steel wire unwrapping wire by tube furnace heating steel wire to 870～930 ℃, has gas shield in the pipe, to avoid the Steel Wire Surface decarburization, shielding gas is nitrogen and/or rare gas element, wherein the preferred argon gas of rare gas element; Carry out oil quenching then, adopt quenching machine oil, temperature is 40～80 ℃;
6) adopt plumbous liquid to carry out the steel wire tempering, plumbous temperature is 440～460 ℃, carries out non-destructive test(ing)(NDT), take-up then.
In the said process, the speed of retractable cable can adopt this area speed commonly used, and the DV value is generally 20～30.
Another object of the present invention provides the application of described alloy spring steel in making high-end motor spring steel wire or bearing spring steel wire, is preferred for making high-end gasoline quenching-tempering valve spring steel wire.
The key technical indexes of high-strength, fatigue-resistant and non-decarburized alloy spring steel of the present invention is as follows:
Steel wire diameter d=0.5～5.5mm, tensile strength 2150～2500MPa, working stress 〉=1050MPa, fatigue lifetime 〉=1.0 * 10
8Inferior.
As theoretical foundation, design the steel grade chemical ingredients according to following experimental formula (being fit to medium carbon structural alloy steel):
Rm＝44.9+2.63Hv+375C
Hv＝235(C+0.167Si+0.223Mn+0.068Ni+0.25Cr+1.8V+3.16N)-43logD-3.46GSN+99.4
In the formula: Rm-tensile strength
The Hv-Vickers' hardness
The D-specimen finish
GSN-austenite crystal degree
The chemical composition design theory of high-strength, fatigue-resistant and non-decarburized alloy spring steel of the present invention is as follows:
1) regulation of C content
From above-mentioned formula as seen, along with the increase of C content in the steel, tensile strength of wire and hardness increase substantially, and C improves the most effective alloying element of tensile strength in the structural alloy steel.But practical experience proves, intensity of steel wire is when improving, and the plasticity of steel, toughness, performance such as corrosion-resistant can obviously reduce, and the decarburizing tendency of steel will increase greatly.Therefore compare with 67CrVA, the contriver reduces about 0.07% with the content of C, remedies owing to C reduces the loss of strength that causes with the mode of adding alloying elements such as V, Nb, N, and this is a kind of scientific and reasonable selection, determines that C content is 0.56%～0.64%.
2) regulation of Si content
Si content is than higher in the 55SiCrA trade mark, and purpose is to improve the elasticity and the resistance toheat of steel wire, and it is little to the hardness of steel influence.But, when Si content is higher, especially when Si content 〉=1.20%, can impel ferrite crystal grain to grow up, cause decarburization easily.In order to solve the problems of the technologies described above, the present invention has added alloying elements such as Mo, can replace the advantageous effect of Si element in steel fully, avoids causing decarburization simultaneously, therefore Si content is defined as 0.90%～1.10%, reasonably.
3) regulation of Mn content
Though the Mn element is little to the intensity contribution of steel, increases Mn content and can improve impelling strength and plasticity, the especially Mn of steel reducing the fragility contribution maximum of steel.And the Mn alloy is that China is rich in resource, and price is also cheap.But when Mn content greater than 1.50% the time, impel the grain growth of steel, can be unfavorable to rigidity, therefore the content with Mn is defined as 0.80%～1.20%.
4) regulation of Cr content
The Cr element is little to the intensity contribution of steel, but for performances such as the erosion resistance that improves steel, hardening capacity, the Cr element is indispensable alloying element.Consider that Cr alloy price is higher, should control use, Cr content is defined as 0.80%～1.20%, necessary.
5) regulation of Mo content
The effect of Mo alloying element in steel is not to be main purpose with the intensity that improves steel, but for performances such as the temper resistance that improves steel, anti-durable creeping, thermotolerances, but the price comparison of Mo alloying element is expensive, should rationally use, Mo content is defined in 0.60%～1.00%, proper.
6) regulation of V, Nb and N content
From above-mentioned formula as seen, after steel grade adds V, Nb and N alloying element, bigger to the intensity contribution that improves steel.Reason is under certain thermodynamic condition, V, Nb and N form nitride, disperse is separated out at matrix crystalline fault location when tempering, make the grain fineness number refinement of steel, in the intensity that improves steel simultaneously, can significantly not reduce the toughness plasticity of steel again, anti-durable creeping performance, the fatigue strength of steel are improved greatly.
Moreover, V+Nb and N will have a rational proportion, to reach 8～10 through the ratio that repeatedly facts have proved [V+Nb]/[N], promptly could guarantee to make fully the N element to form (VN and NbN) compound with 8 times to 10 times V+Nb content, exist in the steel otherwise the N element is free easily, make the surface of steel produce the bubble surface defective, cause the quality of steel seriously to descend, this is one of core innovative point of solving the problems of the technologies described above of the present invention.Facts have proved that micro-Nb element is bigger to the grain refining effect of steel, when V and Nb add in the steel simultaneously, than independent adding V element more remarkable effect.Therefore V content is defined as 0.20%～0.30%, Nb content is defined as 0.05%～0.12%, N content is defined as 0.01%～0.06%, science and reasonably.
7) regulation of rare earth metal RE content
A series of researchs and facts have proved that rare earth metal RE mainly contains following function in steel:
1. in steel, add the rusty scale densification that RE can make steel, and with the bonding force grow of matrix, thereby improve the atmospheric corrosion resistance ability of steel;
2. rare earth metal has the ability of very strong deoxidation, desulfurization, suction hydrogen, has reduced the detrimental impurity in the steel;
3. rare earth metal has the effect that makes the inclusion balling sex change, and RE content greater than effect in 0.02% o'clock significantly mainly forms RE in the steel but have only
2O
2The S compound;
4. the RE atomic radius is little, has solution strengthening and crystal grain thinning effect etc.
The content of RE is defined as 0.02%～0.07%, and reason is that RE content is not obvious less than the effect in steel in 0.02% o'clock, when RE content greater than 0.07% the time, steel middle-weight rare earths inclusion is increased greatly, worsen the purity of steel.
Main innovate point of the present invention is except the chemical ingredients of above-mentioned scientific and reasonable design steel; take a series of obvious results technical measures and step at aspects such as smelting roll process, preparation method of steel wire thereof; comprise the proportioning between the adding method, precedence, [V and Nb] and [RE] and [S] of various iron alloys, and spring steel wire rod strips off the skin and gas shield thermal treatment process etc.
With present spring steel trade mark 67CrVA ratio, the tensile strength of alloy spring steel of the present invention improves sub-400MPa, and working stress has improved 270MPa, improved several ten million times fatigue lifetime, and main is that Steel Wire Surface does not have defectives such as decarburization, crackle.
Embodiment
The preparation method of following alloy spring steel further specifies content of the present invention, but should not be construed as limitation of the present invention, without departing from the spirit and substance of the case in the present invention, modification or replacement to preparation method of the present invention, step or condition are done all belong to scope of the present invention.If do not specialize, the conventional means that used technique means or technical process are well known to those skilled in the art in the enforcement.
The preparation method of embodiment 1 high-strength, fatigue-resistant and non-decarburized alloy spring steel
1, Production Flow Chart:
---------------------breaking down cogging 160mm square billet strips off the skin continuous casting 300 * 400mm square billet hot metal pretreatment---heating---the cold φ 5.5mm of tandem rolling control wire rod---take-up---inspection---packing in flaw detection in flame cleaning in external refining in converter.
2, preparation process:
1) adopts ordinary method to carry out hot metal pretreatment, enter converter steelmaking then;
2) slag former of converter steelmaking adopts calcium oxide and fluorite, when the content of carbon in the molten steel reaches 1.00%～1.10%, when temperature reaches 1550 ℃～1570 ℃, changes the VAD refining furnace over to;
3) adopt iron sheet to wrap up various ferroalloy powdeies respectively, add the Mo-Fe alloy oxidation period in external refining and carry out alloying; At the external refining reduction period, when liquid steel temperature reaches 1550 ℃～1570 ℃, adopt the Mn-Si iron alloy to carry out pre-deoxidation earlier, adopt the Si-Ca powder to carry out final deoxygenation again, add ferrochrome, ferro-vanadium and ferrocolumbium then, nitrogen blowing is to increase the N amount in steel at whole reduction period, and the ratio of control [Nb+V]/[N] is 8.75; Add the RE alloy at last and carry out alloying in steel, the add-on of RE is decided on [S] content in the steel, and the ratio of control [RE]/[S] is 3～4, makes [RE] content of final steel reach 0.04%; When various chemical ingredientss reached prescribed value in the steel, liquid steel temperature reached 1590 ℃～1600 ℃ tappings and goes into ladle;
4) continuous casting becomes 300mm * 400mm square billet, carries out the flame cleaning surface then; And detect a flaw and strip off the skin, remove surface imperfection;
5) the bloom Heating temperature is 1230 ℃～1250 ℃, and the cold temperature of tandem rolling control is 980 ℃～1000 ℃, and finishing temperature is 940 ℃～950 ℃;
6) the wire rod production total coefficient of elongation is 10, and the passage coefficient of extension is 1.1, rolls into φ 5.5mm wire rod at last.
Grade of steel is that the content of each chemical ingredients sees Table 1 in the alloy spring steel of the spring steel of 67CrVA and embodiment 1:
Table 1 chemical ingredients (mass percent %)
Grade of steel is that the spring steel of 67CrVA and the mechanical property of embodiment 1 alloy spring steel see Table 2:
Table 2 mechanical property (diameter 2.0mm)
| The trade mark | Tensile strength/MPa | Working stress/MPa | Relative reduction in area/% | Fatigue lifetime/number of times |
| ??67CrVA | ??1850 | ??830 | ??45 | ??2.3×10 7 |
| ??60SiCrMoVNbNRE | ??2450 | ??1100 | ??50 | ??1.0×10 8 |
The preparation method of embodiment 2 high-strength, fatigue-resistant and non-decarburized alloy spring steels
1, Production Flow Chart:
---------------------breaking down cogging 160mm square billet strips off the skin continuous casting 300 * 400mm square billet hot metal pretreatment---heating---the cold φ 5.5mm of tandem rolling control wire rod---take-up---inspection---packing in flaw detection in flame cleaning in external refining in converter.
2, preparation process:
1) adopts ordinary method to carry out hot metal pretreatment, enter converter steelmaking then;
2) slag former of converter steelmaking adopts fluorite and calcium oxide, when the content of carbon in the molten steel reaches 1.00～1.10%, when temperature reaches 1570 ℃, changes the VAD refining furnace over to;
3) adopt iron sheet to wrap up various ferroalloy powdeies respectively, add the Mo-Fe alloy oxidation period in external refining and carry out alloying; At the external refining reduction period, when liquid steel temperature reaches 1590 ℃, adopt the Mn-Si iron alloy to carry out pre-deoxidation earlier, adopt the Si-Ca powder to carry out final deoxygenation again, add ferrochrome, ferro-vanadium and ferrocolumbium then, nitrogen blowing is to increase the N amount in steel at whole reduction period, and the ratio of control [Nb+V]/[N] is 9; Add the RE alloy at last and carry out alloying in steel, the add-on of RE is decided on [S] content in the steel, and the ratio of control [RE]/[S] is 3～4, makes [RE] content of final steel reach 0.02%; When various chemical ingredientss reached prescribed value in the steel, liquid steel temperature reached 1600 ℃ of tappings and goes into ladle;
4) continuous casting becomes 300mm * 400mm square billet, carries out the flame cleaning surface then; And detect a flaw and strip off the skin, remove surface imperfection;
5) billet heating temperature is 1270 ℃, and the cold temperature of tandem rolling control is 1000 ℃～1020 ℃, and finishing temperature is 950 ℃～960 ℃;
6) the wire rod production total coefficient of elongation is 10, and the passage coefficient of extension is 1.15, rolls into φ 5.5mm wire rod at last.
Grade of steel is that the content of each chemical ingredients sees Table 3 in the alloy spring steel of the spring steel of 67CrVA and embodiment 2:
Table 3 chemical ingredients (mass percent %)
Grade of steel is that the spring steel of 67CrVA and the mechanical property of embodiment 2 alloy spring steels see Table 4:
Table 4 mechanical property (diameter 2.0mm)
| The trade mark | Tensile strength/MPa | Working stress/MPa | Relative reduction in area/% | Fatigue lifetime/number of times |
| ??67CrVA | ??1800 | ??810 | ??47 | ??2.3×10 7 |
| ??60SiCrMoVNbNRE | ??2400 | ??1080 | ??53 | ??1.0×10 8 |
The preparation method of embodiment 3 high-strength, fatigue-resistant and non-decarburized alloy spring steel silks
Prepare high-strength, fatigue-resistant and non-decarburized alloy spring steel according to method substantially the same manner as Example 1, its difference only is: the ratio of control [Nb+V]/[N] is 8.4; The ratio of controlling [RE]/[S] according to the content of [S] in the steel is 3.5, makes [RE] content of final steel reach 0.07%.
Get the alloy spring steel of gained, prepare steel wire according to following method:
1, Production Flow Chart:
φ 5.5mm wire rod unwrapping wire------stripping off the skin,------------------------------retractable cable is packed retractable cable retractable cable mechanical descaling in flaw detection in tempering in oil quenching in the gas shield heating to be drawn into φ 2.0mm in annealing by take-up---inspection---.
2, preparation process:
1)---aligning---------cutting---inverted take-up that enters slicing mould that bending is peeled off that carry out mechanical descaling and stripping off the skin behind the φ 5.5mm wire rod unwrapping wire, its technological process is: the wire rod unwrapping wire;
2) adopt slicing mould that the mode of described wire rod scraping is stripped off the skin, the degree of depth is 0.15mm, and the steel wire movement velocity is 140m/min, and the steel that scrapes off is simultaneously cut and adopted rotating knife to cut off recovery;
3) annealing temperature after stripping off the skin is 920～930 ℃;
4) annealing back wire rod is in φ 600 straight drawing machine drawings 8 passages, and total draft is 85.2%, is drawn into φ 2.0mm steel wire;
5) φ 2.0mm steel wire unwrapping wire before oil quenching, by tube furnace heating steel wire to 920～930 ℃, has gas shield in the pipe, shielding gas is a nitrogen; During oil quenching, adopt quenching oil, temperature is 80 ℃;
6) adopt plumbous liquid to carry out the steel wire tempering, plumbous temperature is 445 ℃, carries out non-destructive test(ing)(NDT) then, last take-up, finished product inspection, packing warehouse-in.
Grade of steel is that the content of each chemical ingredients sees Table 5 in the alloy spring wire of the spring wire of 67CrVA and embodiment 3:
Table 5 chemical ingredients (mass percent %)
Grade of steel is that the spring wire of 67CrVA and the mechanical property of embodiment 3 alloy spring wires see Table 6:
Table 6 mechanical property (diameter 2.0mm)
| The trade mark | Tensile strength/MPa | Working stress/MPa | Relative reduction in area/% | Fatigue lifetime/number of times |
| ??67CrVA | ??1900 | ??855 | ??44 | ??2.3×10 7 |
| ??60SiCrMoVNbNRE | ??2500 | ??1125 | ??49 | ??1.2×10 8 |
Embodiment 4
Prepare high-strength, fatigue-resistant and non-decarburized alloy spring steel according to method substantially the same manner as Example 1, its difference only is: the ratio of control [Nb+V]/[N] is 10; The ratio of controlling [RE]/[S] according to the content of [S] in the steel is 4, makes [RE] content of final steel reach 0.06%.
Get the alloy spring steel of gained, prepare steel wire according to following method:
1, Production Flow Chart:
φ 5.5mm wire rod unwrapping wire------stripping off the skin,------------------------------retractable cable is packed retractable cable retractable cable mechanical descaling in flaw detection in tempering in oil quenching in the gas shield heating to be drawn into φ 2.0mm in annealing by take-up---inspection---.
2, preparation process:
1) carry out mechanical descaling behind the φ 5.5mm wire rod unwrapping wire and strip off the skin, its technological process is:
---aligning---------cutting---the inverted take-up that enters slicing mould that bending is peeled off of wire rod unwrapping wire;
2) adopt slicing mould that the mode of described wire rod scraping is stripped off the skin, the degree of depth is 0.10mm, and the steel wire movement velocity is 200m/min, and the steel that scrapes off is simultaneously cut and adopted rotating knife to cut off recovery;
3) annealing temperature after stripping off the skin is 870～880 ℃;
4) annealing back wire rod is in φ 600 straight drawing machine drawings 8 passages, and total draft is 85.7%, is drawn into φ 2.0mm steel wire;
5) φ 2.0mm steel wire unwrapping wire before oil quenching, by tube furnace heating steel wire to 870～880 ℃, has gas shield in the pipe, shielding gas is an argon gas; During oil quenching, adopt quenching oil, temperature is 40 ℃;
6) adopt plumbous liquid to carry out the steel wire tempering, plumbous temperature is 445 ℃, carries out non-destructive test(ing)(NDT) then, last take-up, finished product inspection, packing warehouse-in.
Grade of steel is that the content of each chemical ingredients sees Table 7 in the alloy spring wire of the spring wire of 67CrVA and embodiment 4:
Table 7 chemical ingredients (mass percent %)
Grade of steel is that the spring wire of 67CrVA and the mechanical property of embodiment 4 alloy spring wires are seen
Table 8:
Table 8 mechanical property (diameter 2.0mm)
| The trade mark | Tensile strength/MPa | Working stress/MPa | Relative reduction in area/% | Fatigue lifetime/number of times |
| ??67CrVA | ??1750 | ??788 | ??48 | ??2.3×10 7 |
| ??60SiCrMoVNbNRE | ??2350 | ??1050 | ??55 | ??1.0×10 8 |
Claims (10)
1. high-strength, fatigue-resistant and non-decarburized alloy spring steel, it is characterized in that, comprise following chemical components in mass percent: C 0.56%～0.64%, Si 0.80%～1.10%, Mn0.80%～1.20%, P≤0.035%, S≤0.03%, Cr 0.80%～1.20%, Mo 0.60%～1.00%, V 0.20%～0.30%, Nb 0.05%～0.12%, N 0.01%～0.06%, RE0.02%～0.07%, surplus is Fe; Preferably, described alloy spring steel comprises following chemical components in mass percent: C 0.58%～0.62%, Si 0.90%～1.10%, Mn 0.90%～1.10%, P≤0.020%, S≤0.020%, Cr 0.90%～1.20%, Mo 0.80%～1.00%, V 0.20%～0.26%, Nb 0.06%～0.11%, N 0.02%～0.05%, RE 0.03%～0.06%, and surplus is Fe.
2. high-strength, fatigue-resistant and non-decarburized alloy spring steel according to claim 1 is characterized in that, the mass ratio of [Nb+V]/[N] is 8～10.
3. high-strength, fatigue-resistant and non-decarburized alloy spring steel according to claim 1 is characterized in that, the mass ratio of [RE]/[S] is 3～4.
4. the preparation method of a high-strength, fatigue-resistant and non-decarburized alloy spring steel as claimed in claim 1 is characterized in that, comprises the steps:
------------------continuous casting strips off the skin hot metal pretreatment---heating---the cold φ 5.5～20mm of tandem rolling control wire rod---take-up in flaw detection in flame cleaning in external refining in converter.
5. method according to claim 4 is characterized in that, the step of described external refining is as follows:
1) adopts iron sheet to wrap up various ferroalloy powdeies respectively, add the Mo-Fe alloy oxidation period in external refining; At the external refining reduction period, when liquid steel temperature during, add Si-Mn earlier, the Si-Ca iron alloy carries out deoxidation, adds Cr-Fe, V-Fe and Nb-Fe alloy then at 1550～1590 ℃, in described reduction period nitrogen blowing in steel, the ratio of control [Nb+V]/[N] is 8～10;
2) add the RE alloy at last in steel, the ratio of control [RE]/[S] is 3～4.
6. the preparation method of the steel wire of a high-strength, fatigue-resistant and non-decarburized alloy spring steel as claimed in claim 1 is characterized in that, comprises the steps:
------mechanical descaling strips off the skin the wire rod unwrapping wire---retractable cable---thermal treatment---retractable cable---drawing---retractable cable---gas shield heating---oil quenching---tempering---flaw detection---take-up.
7. method according to claim 6 is characterized in that, described stripping off the skin is to adopt slicing mould that the mode of described wire rod scraping is carried out, and the degree of depth is 0.10～0.15mm, and the steel wire movement velocity is 140～200m/min.
8. method according to claim 6 is characterized in that, described heat treated temperature is 870～930 ℃.
9. method according to claim 6 is characterized in that, described gas shield heating is that wherein the shielding gas in the pipe is nitrogen and/or rare gas element by tube furnace heating steel wire to 870～930 ℃.
10. the application of the described high-strength, fatigue-resistant and non-decarburized alloy spring steel of claim 1 in making high-end Automobile air door spring steel wire or bearing spring steel wire.
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| CN2010101025775A CN101787493B (en) | 2010-01-25 | 2010-01-25 | Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof |
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