CN104233098A - Low-cost 60Si2Mn spring steel and production technology thereof - Google Patents
Low-cost 60Si2Mn spring steel and production technology thereof Download PDFInfo
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Abstract
The invention relates to low-cost 60Si2Mn spring steel. The spring steel comprises components in percentage by weight as follows: 0.58%-0.62% of C, 1.70%-1.80% of Si, 0.80-0.90% of Mn, smaller than or equal to 0.35% of Cr, smaller than or equal to 0.35% of Ni and smaller than or equal to 0.20% of Cu, and further comprises residual components in percentage by weight as follows: smaller than or equal to 13*10<-6> of [O], smaller than or equal to 0.030% of S, smaller than or equal to 0.030% of P and the balance of Fe and other trace residual elements. A production technology of the low-cost 60Si2Mn spring steel comprises steps as follows: converter smelting, external refining, continuous casting, heating, rolling and cooling and cutting to length. Compared with the conventional technology, the low-cost 60Si2Mn spring steel and the production technology thereof have the advantage of low alloy cost and process cost; and low-cost 60Si2Mn spring steel has the effects of stable low-cost production performance, good decarbonizing control effect and good end part quality through combination control of smelting, a rolled steel blank heating technology and a cutting-to-length technology.
Description
Technical field
The invention belongs to technical field of metallurgical manufacturing, special steel class, relate to a kind of steel and production technique thereof, specifically for the leaf spring of automobile, railway and engineering machinery, helical spring a kind of low cost 60Si2Mn spring steel and production technique thereof.
Background technology
60Si2Mn is one of most popular spring steel kind of China, its consumption accounts for about 70% of spring steel total amount, there is alloying element content low, temper resistance is good, elasticity attenuation resistance is good, the advantage of excellent property after thermal treatment, but this steel grade exist decarburizing tendency comparatively large, shear the problem that rearward end easily ftractures.Spring steel is just towards high strength, long-life future development, more and more higher to the specification of quality such as homogeneity of structure, surface quality, decarburized layer deepness, mechanical property of spring steel.For ensureing performance index and the work-ing life of spring steel, production technique of the prior art mainly contains:
Describing a kind of weight percentages of components (Wt%) in " exploitation of 60Si2Mn spring steel wire rod " document disclosed in October, 2011 in " metal products " is: C:0.58% ~ 0.60%, Si:1.63% ~ 1.67%, Mn:0.83% ~ 0.87%, Cr:0.12% ~ 0.18%, S :≤0.010%, the 60Si2Mn spring steel of P :≤0.020%, it has homogeneous microstructure, advantage of good performance.But for reducing decarburization, obtaining good tissue, in composition proportion, with the addition of the Cr element of 0.12% ~ 0.18%, adding production cost.
The weight percentages of components (Wt%) introduced in " Nb-V microalloying is on the impact of spring steel 60Si2MnA surface decarburization " document disclosed in February, 2011 in " material heat treatment technology " is: C:0.58%, Si:1.60%, Mn:0.76%, Cr:0.35%, Nb:0.024%, V:0.12%, S:0.005%, the 60Si2MnA spring steel of P:0.008%, result of study shows that adding Nb, V effectively can reduce decarburization, but alloying element interpolation can increase production cost.
Publication number CN1510089, disclosed in the patent of by name " a kind of prevent the material of high carbon steel decarburization ", billet surface coating effectively can reduce practical decarburized depth, but such a process increases production process, and production cost is increased.
Cut the problem of rearward end transverse crack for solving 60Si2Mn spring steel in " Jiangsu is metallurgical " in October, 2008 disclosed " 60Si2Mn spring steel crack on end side producing cause is analyzed and inquired into " document, adopt the technique entering burial pit slow cooling after rolling off the production line, although this method effectively can solve the problem of cutting rearward end cracking, but add production process, manufacturing cost is increased.
In sum, current production spring steel is in order to obtain good Performance and quality, mainly through adding alloying element, adopt roll after to roll off the production line the technique such as slow cooling and billet surface coating, these methods or technique increase manufacturing cost, under the stagnant background of present steel industry, be unfavorable for the future development of this steel grade to low cost, the high market competitiveness.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides that a kind of decarburization is low, stable performance, the low cost 60Si2Mn spring steel of long service life and production technique thereof.
The technical solution adopted for the present invention to solve the technical problems is: a kind of low cost 60Si2Mn spring steel, its component and weight percent (Wt%) are: C:0.58% ~ 0.62%, Si:1.70% ~ 1.80%, Mn:0.80% ~ 0.90%, Cr :≤0.35%, Ni :≤0.35%, Cu :≤0.20%, also comprise the residual components of following weight percent (Wt%): [O]≤13 × 10
-6, S :≤0.030%, P :≤0.030%, remaining is Fe and some other micro residue elements.
The production technique of above-mentioned low cost 60Si2Mn spring steel, its processing step is:
The first step: converter smelting, chooses above-mentioned materials, adopts the converter smelting of 130t, adds in converter by molten iron and steel scrap, and the strict terminal C that controls controls >=0.10%, and terminal of controlling well tapping slag, controls P≤0.015%;
Second step: external refining, the molten steel ladle that the first step obtains is winched to furnaceman LF position, guarantee that the good and slag look of slag fluidity bleaches, control Ar air pressure simultaneously well, prevent molten steel rolling from seriously causing slag, Fruit storage is carried out to molten steel, be less than below 0.266kPa vacuum tightness treatment time >=18min, the Ca process of refining later stage, simultaneously weak stirrings calmness, soft argon blowing time >=15min, ensures that inclusion fully floats;
3rd step: continuous casting, the molten steel ladle of above-mentioned process is winched to platform, adopt the superheating temperature of≤40 DEG C, constant temperature permanent pulling rate, automatic liquid surface control technology, M-EMS technology, use comprise large bag long nozzle argon envelope, the measure of middle bag submerged nozzle, middle covering agent, crystallizer protecting residue carries out omnidistance argon for protecting pouring to molten steel, steel billet carried out stacking slow cooling process or redly send heating rolling;
4th step: heating rolling, strand after slow cooling process or the red steel billet that send are heated, Heating temperature is 1120 ± 20 DEG C, total heat-up time >=260min, control steel billet at high temperature section time 80 ~ 100min, make the even heat penetration of steel billet be unlikely to again high temperature section overlong time, strand adopts the iron scale of high-pressure water descaling guarantee billet surface except clean after coming out of the stove;
5th step: cooling scale, after the end of rolling the strand that above-mentioned 4th step prepares is served cold bed cooling, shears when temperature >=300 DEG C according to rhythm of production ,≤300 DEG C time adopt emery wheel sawing, obtain 60Si2Mn spring steel.
The invention has the beneficial effects as follows: 1, strictly controlled by smelting process, guarantee that steel billet composition arrowband, homogeneity of ingredients control good, spring steel structure property just can be made uniform and stable, with existing control method than having the low advantage of cost of alloy without the need to additionally adding alloy; 2, rolling process is by the design of heating steel billet technique with strictly control, the decarburized layer deepness stability contorting of 60Si2Mn spring steel is made to be round steel diameter at 1%D(D) below, significantly reduce the decarburization of spring steel, with existing control method than having cost of alloy and the low advantage of process cost; 3, simultaneously according to actual production rhythm, adopt when >=300 DEG C shear scale ,≤300 DEG C time adopt emery wheel sawing, avoid scale to cause spring steel cracking ends, its control method and conventional control methods are than having the low advantage of process cost; By the effect of the 60Si2Mn spring steel that Comprehensive Control realizes low cost production stable performance, Decarburization Control is effective, end mass is good of smelting, rolling steel billet heating process, scale technique.
Embodiment
below in conjunction with embodiment, the present invention is further described.
A kind of low cost 60Si2Mn spring steel, its component and weight percent (Wt%) are: C:0.58% ~ 0.62%, Si:1.70% ~ 1.80%, Mn:0.80% ~ 0.90%, Cr :≤0.35%, Ni :≤0.35%, Cu :≤0.20%, also comprise the residual components of following weight percent (Wt%): [O]≤13 × 10
-6, S :≤0.030%, P :≤0.030%, remaining is Fe and some other micro residue elements.
The production technique of above-mentioned low cost 60Si2Mn spring steel, its processing step is:
The first step: converter smelting, chooses above-mentioned materials, adopts the converter smelting of 130t, adds in converter by molten iron and steel scrap, and the strict terminal C that controls controls >=0.10%, and terminal of controlling well tapping slag, controls P≤0.015%;
Second step: external refining, the molten steel ladle that the first step obtains is winched to furnaceman LF position, guarantee that the good and slag look of slag fluidity bleaches, control Ar air pressure simultaneously well, prevent molten steel rolling from seriously causing slag, Fruit storage is carried out to molten steel, be less than below 0.266kPa vacuum tightness treatment time >=18min, the Ca process of refining later stage, simultaneously weak stirrings calmness, soft argon blowing time >=15min, ensures that inclusion fully floats;
3rd step: continuous casting, the molten steel ladle of above-mentioned process is winched to platform, adopt the superheating temperature of≤40 DEG C, constant temperature permanent pulling rate, automatic liquid surface control technology, M-EMS technology, use comprise large bag long nozzle argon envelope, the measure of middle bag submerged nozzle, middle covering agent, crystallizer protecting residue carries out omnidistance argon for protecting pouring to molten steel, steel billet carried out stacking slow cooling process or redly send heating rolling;
4th step: heating rolling, strand after slow cooling process or the red steel billet that send are heated, Heating temperature is 1120 ± 20 DEG C, total heat-up time >=260min, control steel billet at high temperature section time 80 ~ 100min, make the even heat penetration of steel billet be unlikely to again high temperature section overlong time, strand adopts the iron scale of high-pressure water descaling guarantee billet surface except clean after coming out of the stove;
5th step: cooling scale, after the end of rolling the strand that above-mentioned 4th step prepares is served cold bed cooling, shears when temperature >=300 DEG C according to rhythm of production ,≤300 DEG C time adopt emery wheel sawing, obtain 60Si2Mn spring steel.
Embodiment 1: a kind of 60Si2Mn spring steel, its component and weight percent are: C:0.59%, Si:1.73%, Mn:0.84%, P:0.015%, S:0.001%, Cr :≤0.35%, Ni :≤0.35%, Cu :≤0.20%, [O]: 9ppm, surplus is Fe and some other micro residue elements.
1, converter smelting, chooses above-mentioned materials, adopts the converter smelting of 130t, molten iron and steel scrap are added in converter, molten iron is greater than 15:1 with the ratio (weight ratio Wt%) of steel scrap, uses excellent steel scrap, strict control terminal C >=0.10%, P is controlled≤0.015%, terminal of controlling well tapping slag, tapping process adopts slide plate pushing off the slag technology strictly to control the lower quantity of slag, tap 1/3 time add ferro-aluminum and carry out pre-deoxidation, add silicomanganese, ferromanganese etc. simultaneously and carry out alloying, Si, Mn composition controls by internal control lower limit;
2, external refining, after tapping, molten steel ladle is winched to furnaceman LF position by overhead traveling crane, thermometric, sampling survey composition, start heated by electrodes, be energized and after 3 minutes, add the mobility that lime and fluorite carry out slag making, adjustment slag in batches, the LF refining initial stage makes white slag fast, and the middle and later periods protects white slag, reduces the oxygen level of molten steel; Refining process carries out molten steel protection, prevents from contacting with air.With overhead traveling crane, molten steel is winched to RH refining station, then start vacuum circulation degassing process, process and within 3 minutes, carry out sampling, determining oxygen.Molten steel keeps treatment time 20min under≤0.266kPa vacuum tightness, high vacuum stage of Fig and process later stage do not add any alloy adjusting component, vacuum circular flow adopts argon gas, vacuum-treat terminates the calcium iron wire feeding about 200m, then carbonization rice husk insulation is dropped into, carry out the process of soft blow argon, soft argon blowing time 24min;
3, billet continuous casting, after soft blow argon terminates, molten steel ladle is winched to platform, guarantee that ladle long nozzle depth of penetration >=200mm connects tundish, and the submerged nozzle depth of penetration of tundish controls by 120 ± 20mm, opens water with drainage sand drainage, 280mm × 280mm square billet is adopted to cast, open and water backward crystallizer and add specific covering slag, covering slag will marginally, equably add, the superheating temperature of casting process 21-39 DEG C, constant temperature permanent pulling rate, M-EMS; And omnidistance argon envelope molding casting is carried out to molten steel; Casting process uses torch-cutting machine to carry out a point base cutting by blank specified length 9000mm, is winched on transhipment train by steel billet, be transported to Steel Mill with fixture;
4, heating rolling, strand after slow cooling process or the red steel billet that send are heated, Heating temperature is 1108 DEG C ~ 1131 DEG C, heating 280min, strand high temperature section time 98min, strand adopt high-pressure water descaling to ensure after coming out of the stove the iron scale of billet surface is except clean, control tapping, Rolling Production rhythm well according to follow-up tandem rolling, hot saw situation;
5, upper cold bed cooling, controls cold bed rhythm well, and actual scale temperature 268 DEG C, adopts emery wheel sawing, obtained 60Si2Mn spring steel.
Embodiment 2: a kind of 60Si2Mn spring steel, its component and weight percent are: C:0.60%, Si:1.76%, Mn:0.84%, P:0.014%, S:0.003%, Cr :≤0.35%, Ni :≤0.35%, Cu :≤0.20%, [O]: 8ppm, surplus is Fe and some other micro residue elements.
1, converter smelting, chooses above-mentioned materials, adopts the converter smelting of 130t, molten iron and steel scrap are added in converter, molten iron is greater than 15:1 with the ratio (weight ratio Wt%) of steel scrap, uses excellent steel scrap, strict control terminal C >=0.10%, P is controlled≤0.015%, terminal of controlling well tapping slag, tapping process adopts slide plate pushing off the slag technology strictly to control the lower quantity of slag, tap 1/3 time add ferro-aluminum and carry out pre-deoxidation, add silicomanganese, ferromanganese etc. simultaneously and carry out alloying, Si, Mn composition controls by internal control lower limit;
2, external refining, after tapping, molten steel ladle is winched to furnaceman LF position by overhead traveling crane, thermometric, sampling survey composition, start heated by electrodes, be energized and after 3 minutes, add the mobility that lime and fluorite carry out slag making, adjustment slag in batches, the LF refining initial stage makes white slag fast, and the middle and later periods protects white slag, reduces the oxygen level of molten steel; Refining process carries out molten steel protection, prevents from contacting with air.With overhead traveling crane, molten steel is winched to RH refining station, then start vacuum circulation degassing process, process and within 3 minutes, carry out sampling, determining oxygen; Guarantee that molten steel keeps treatment time 23min under≤0.266kPa vacuum tightness, high vacuum stage of Fig and process later stage do not add any alloy adjusting component.Vacuum circular flow adopts argon gas; Vacuum-treat terminates the calcium iron wire feeding about 200m, then drops into carbonization rice husk insulation, carries out the process of soft blow argon, soft argon blowing time 19min;
3, billet continuous casting, after soft blow argon terminates, winches to platform by molten steel ladle, guarantees that ladle long nozzle depth of penetration >=200mm connects tundish, and the submerged nozzle depth of penetration of tundish controls by 120 ± 20mm.Open with drainage sand drainage and water, adopt 280mm × 280mm square billet to cast, open and water backward crystallizer and add specific covering slag, covering slag will marginally, equably add, the superheating temperature of casting process 21-39 DEG C, constant temperature permanent pulling rate, M-EMS; And omnidistance argon envelope molding casting is carried out to molten steel; Casting process uses torch-cutting machine to carry out a point base cutting by blank specified length 9000mm, is winched on transhipment train by steel billet, be transported to Steel Mill with fixture;
4, heating rolling, strand after slow cooling process or the red steel billet that send are heated, Heating temperature is 1111 DEG C ~ 1130 DEG C, heating 278min, steel billet is at high temperature section time 88min, strand adopt high-pressure water descaling to ensure after coming out of the stove the iron scale of billet surface is except clean, control tapping, Rolling Production rhythm well according to follow-up tandem rolling, hot saw situation;
5, upper cold bed cooling, controls cold bed rhythm well, actual scale temperature 268 DEG C, shear temperature 326 DEG C, obtained 60Si2Mn spring steel.
The feature that 60Si2Mn spring steel has stable performance, Decarburization Control is effective, end mass good, production cost is low that above-mentioned two embodiments prepare, its related data is as follows:
Table 1 60Si2Mn chemical composition (Wt, %)
| Sequence number | C | Si | Mn | P | S | Cr | Cu | Ni | O |
| Embodiment 1 | 0.59 | 1.73 | 0.84 | 0.015 | 0.001 | 0.017 | 0.022 | 0.001 | 0.0009 |
| Embodiment 2 | 0.60 | 1.76 | 0.84 | 0.014 | 0.003 | 0.019 | 0.013 | 0.004 | 0.0008 |
| The present invention | 0.58-0.60 | 1.63-1.67 | 0.83-0.87 | ≤0.020 | ≤0.010 | 0.12-0.18 | ? | ? | ? |
Table 2 process parameter controls
Table 3 60Si2Mn structure property
Table 4 60Si2Mn mechanical property
| Sequence number | Rp0.2 | Rm | A% | Z% | HBW |
| Embodiment 1 | 1257 / 1265 | 1424 / 1439 | 8 / 7.5 | 30 / 27 | 277 / 283 / 282 |
| Embodiment 2 | 1280 / 1276 | 1442 / 1438 | 7 / 7 | 30 / 31 | 276 / 278 / 278 |
| The present invention | 1190 /1200 | 1330 /1350 | 8.4 /8.5 | 28 /29 | 280 /292 |
Strictly controlled by smelting process, steel billet composition arrowband, homogeneity of ingredients control good, and in order to realize, spring steel performance is uniform and stable provides guarantee; Rolling process, by the design of heating steel billet technique and strictly control, makes the decarburized layer deepness stability contorting of 60Si2Mn spring steel be round steel diameter at 1%D(D) below, significantly reduce the decarburization of spring steel; Simultaneously according to actual production rhythm, adopt when >=300 DEG C shear scale ,≤300 DEG C time adopt emery wheel sawing, avoid scale to cause spring steel cracking ends.By the effect that Comprehensive Control realizes spring steel stable performance, Decarburization Control is effective, end mass good, production cost is low of smelting, rolling steel billet heating process, scale technique.
Claims (1)
1. a low cost 60Si2Mn spring steel, it is characterized in that component and weight percent (Wt%) are: C:0.58% ~ 0.62%, Si:1.70% ~ 1.80%, Mn:0.80% ~ 0.90%, Cr :≤0.35%, Ni :≤0.35%, Cu :≤0.20%, also comprise the residual components of following weight percent (Wt%): [O]≤13 × 10
-6, S :≤0.030%, P :≤0.030%, remaining is Fe and some other micro residue elements;
The production technique of above-mentioned low cost 60Si2Mn spring steel, is characterized in that processing step is:
The first step: converter smelting, chooses above-mentioned materials, adopts the converter smelting of 130t, adds in converter by molten iron and steel scrap, and the strict terminal C that controls controls >=0.10%, and terminal of controlling well tapping slag, controls P≤0.015%;
Second step: external refining, the molten steel ladle that the first step obtains is winched to furnaceman LF position, guarantee that the good and slag look of slag fluidity bleaches, control Ar air pressure simultaneously well, prevent molten steel rolling from seriously causing slag, Fruit storage is carried out to molten steel, be less than below 0.266kPa vacuum tightness treatment time >=18min, the Ca process of refining later stage, simultaneously weak stirrings calmness, soft argon blowing time >=15min, ensures that inclusion fully floats;
3rd step: continuous casting, the molten steel ladle of above-mentioned process is winched to platform, adopt the superheating temperature of≤40 DEG C, constant temperature permanent pulling rate, automatic liquid surface control technology, M-EMS technology, use comprise large bag long nozzle argon envelope, the measure of middle bag submerged nozzle, middle covering agent, crystallizer protecting residue carries out omnidistance argon for protecting pouring to molten steel, steel billet carried out stacking slow cooling process or redly send heating rolling;
4th step: heating rolling, strand after slow cooling process or the red steel billet that send are heated, Heating temperature is 1120 ± 20 DEG C, total heat-up time >=260min, control steel billet at high temperature section time 80 ~ 100min, make the even heat penetration of steel billet be unlikely to again high temperature section overlong time, strand adopts the iron scale of high-pressure water descaling guarantee billet surface except clean after coming out of the stove;
5th step: cooling scale, after the end of rolling the strand that above-mentioned 4th step prepares is served cold bed cooling, shears when temperature >=300 DEG C according to rhythm of production ,≤300 DEG C time adopt emery wheel sawing, obtain 60Si2Mn spring steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106947921A (en) * | 2017-03-20 | 2017-07-14 | 石家庄钢铁有限责任公司 | A kind of high-speed railway spring corrosion-resistant spring steel and its production method |
| CN107299291A (en) * | 2017-06-30 | 2017-10-27 | 武汉钢铁有限公司 | A kind of spring steel and its skin decarburization control technique |
| CN109161632A (en) * | 2018-08-24 | 2019-01-08 | 邢台钢铁有限责任公司 | Control the production method of large scale hard inclusions object in spring steel wire rod |
| CN109735765A (en) * | 2019-01-17 | 2019-05-10 | 江苏利淮钢铁有限公司 | A kind of big specification, Ultra-fine Grained, high-strength tenacity spring steel and its production method |
| CN109881117A (en) * | 2019-03-20 | 2019-06-14 | 包头钢铁（集团）有限责任公司 | A kind of high-carbon spring hot-rolled coil and its production method |
| CN111270155A (en) * | 2020-03-11 | 2020-06-12 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111961981A (en) * | 2020-07-29 | 2020-11-20 | 南京钢铁股份有限公司 | 60Si2Mn spring steel for railway fastener and preparation method thereof |
| CN112760570A (en) * | 2020-12-28 | 2021-05-07 | 武钢集团襄阳重型装备材料有限公司 | Novel 60Si2Mn spring flat steel and preparation method thereof |
| CN115074604A (en) * | 2022-08-11 | 2022-09-20 | 江苏省沙钢钢铁研究院有限公司 | Spring steel wire rod and production method thereof |
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| CN106947921A (en) * | 2017-03-20 | 2017-07-14 | 石家庄钢铁有限责任公司 | A kind of high-speed railway spring corrosion-resistant spring steel and its production method |
| CN107299291A (en) * | 2017-06-30 | 2017-10-27 | 武汉钢铁有限公司 | A kind of spring steel and its skin decarburization control technique |
| CN107299291B (en) * | 2017-06-30 | 2019-05-24 | 武汉钢铁有限公司 | A kind of spring steel and its skin decarburization control technique |
| CN109161632B (en) * | 2018-08-24 | 2020-11-24 | 邢台钢铁有限责任公司 | Production method for controlling large-size hard inclusions in spring steel wire rod |
| CN109161632A (en) * | 2018-08-24 | 2019-01-08 | 邢台钢铁有限责任公司 | Control the production method of large scale hard inclusions object in spring steel wire rod |
| CN109735765A (en) * | 2019-01-17 | 2019-05-10 | 江苏利淮钢铁有限公司 | A kind of big specification, Ultra-fine Grained, high-strength tenacity spring steel and its production method |
| CN109735765B (en) * | 2019-01-17 | 2020-05-05 | 江苏利淮钢铁有限公司 | Large-sized, ultra-fine grain, high-strength and high-toughness spring steel and production method thereof |
| CN109881117A (en) * | 2019-03-20 | 2019-06-14 | 包头钢铁（集团）有限责任公司 | A kind of high-carbon spring hot-rolled coil and its production method |
| CN111270155A (en) * | 2020-03-11 | 2020-06-12 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111270155B (en) * | 2020-03-11 | 2021-08-10 | 南京钢铁股份有限公司 | Preparation method of spring steel hot-rolled steel strip for safety belt |
| CN111961981A (en) * | 2020-07-29 | 2020-11-20 | 南京钢铁股份有限公司 | 60Si2Mn spring steel for railway fastener and preparation method thereof |
| CN112760570A (en) * | 2020-12-28 | 2021-05-07 | 武钢集团襄阳重型装备材料有限公司 | Novel 60Si2Mn spring flat steel and preparation method thereof |
| CN115074604A (en) * | 2022-08-11 | 2022-09-20 | 江苏省沙钢钢铁研究院有限公司 | Spring steel wire rod and production method thereof |
| CN115074604B (en) * | 2022-08-11 | 2023-01-31 | 江苏省沙钢钢铁研究院有限公司 | Spring steel wire rod and production method thereof |
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