CN109457183A - A kind of low-sulfur free-cutting pinion steel and preparation method thereof - Google Patents
A kind of low-sulfur free-cutting pinion steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of low-sulfur free-cutting pinion steel and preparation method thereof, pinion steel described in weight percent includes following chemical component: C:0.17~0.23%, Si:0.17~0.37%, Mn:0.80~1.15%, Cr:1.00~1.35%, P :≤0.035%, S:0.020~0.040%, Ti :≤0.04~0.10%, Al :≤0.04%, O :≤20 × 10‑4%, surplus are Fe and inevitable impurity.The preparation method comprises the following steps: 1) electric furnace smelting；2) LF furnace refines；3) VD furnace vacuum refining；4) continuous casting；5) hot sending rolling.Gained pinion steel of the invention has good machinability, and will not crack in processing forging process.
Description
Technical field
The invention belongs to metallurgical technology field, be related to a kind of good low-sulfur free-cutting pinion steel of machinability and its
Preparation method.
Background technique
With the rapid development of machine-building and auto industry, the quantity of automatic machine tool increases sharply, gear and rack gear etc.
Manufacture generally use supermatic flow line production mode, this production method requires the cutting ability of steel that must expire
The needs of sufficient technique.Since the yield of gear is very big, cutting ability slightly improves, that is, can produce very big economic benefit.Therefore
Increasingly higher demands are proposed to the free cutting property for being cut material.Machining cost be in manufacturing industry components manufacture at
This major part, sometimes even over the 40% of components manufacturing cost, user wishes pole the machining by improving steel
Performance reduces processing cost.
Sulphur automatic steel based on cutting ability, sulfur content is generally 0.20%~0.60%；Based on mechanical performance,
Automatic steel supplemented by cutting ability, sulfur content do more important structural member 0.02%~0.13%.Machine components are used
Steel, when sulfur content is less than 0.015%, machining is extremely difficult, economically also uneconomical.Since the yield of gear is very big,
So cutting ability slightly improves, that is, it can produce very big economic benefit.Therefore, the technology of Germany and Japanese pinion steel in recent years
The bound requirement of sulphur is generally defined in condition, the purpose is to improve the cutting ability of steel.
Summary of the invention
It is an object of the present invention to provide a kind of low-sulfur free-cutting pinion steels with good machinability, and
It will not be cracked in processing forging process.
To solve the above-mentioned problems, the invention provides the following technical scheme:
The present invention is a kind of low-sulfur free-cutting pinion steel, weight percent it include following chemical component: C:0.17~
0.23%, Si:0.17~0.37%, Mn:0.80~1.15%, Cr:1.00~1.35%, P :≤0.035%, S:0.020~
0.040%, Ti :≤0.04~0.10%, Al :≤0.04%, O :≤20 × 10-4%, surplus be Fe and inevitably it is miscellaneous
Matter.
A kind of above-mentioned low-sulfur free-cutting pinion steel preparation method, comprising the following steps:
1, electric furnace smelting: feed stock for blast furnace is molten iron and steel scrap, using high quality burden, it is ensured that molten iron percentage is no less than
40%, and add the alloys such as silicomanganese, Gao Meng, high chromium in predetermined component ratio and carry out ladle alloying；Electric furnace smelting whole process is made
Foamed slag guarantees good oxidizing boil, and steel inclusion and gas is promoted to float, and decarburized amount is greater than 0.30%, controls terminal
[C] >=0.10%, 1630~1660 DEG C of molten steel tapping temperature, tap Shi Liugang, remaining slag operation, forbids slag, tapping plus steel core
Aluminium carries out pre-deoxidation.
2, LF furnace refines: the molten steel for passing through electric furnace smelting in step 1 being carried out the refining of LF furnace, whole process is made white in refining process
Slag, white slag retention time >=15 minute, final deoxidizing is fed aluminium content in aluminum steel control steel and is guaranteed 0.010~0.040% before tapping
Molten steel cleanliness.2~3m/t of titanium wire steel is fed, then feeds CaSi line by 4.0~5.0m/t, carries out inclusions class, it is clean
Net molten steel；Ingredient and fine tune temperature guarantee the performance stabilization and continuous casting process temperature requirement of steel.
3, VD furnace vacuum refining: the molten steel after LF furnace refining in step 2 is carried out to take off Slag treatment, it is de- that molten steel carries out vacuum
Gas, vacuum degree are less than the 67Pa lower retention time greater than 12 minutes, sulphur iron wire are fed after breaking vacuum, and sulfur content control in steel is existed
0.020~0.040%, continue soft blow argon and be greater than 15 minutes, control oxide morphology, avoids occurring bulky grain sulfide folder in steel
It is miscellaneous.
4, continuous casting: molten steel uses monoblock type Tundish Connection after step 3 processing, is poured using whole process protection, using covering
Lid agent, the special crystallizer covering slag for selecting function admirable, to prevent secondary oxidation of steel, middle packet liquid level is stablized 700
±50mm；Using Prepared by Low Superheat Pouring, middle baotou steel water superheat control mitigates center porosity and segregation at 20~30 DEG C；Crystallization
Device and solidification end use electromagnetic agitation, reduce the tissue defects such as segregation, improve slab quality.Casting uses " constant level, constant temperature
The permanent operation of degree, permanent pulling rate " three, slab is into withdrawal straightening machine temperature >=920 DEG C.
5, hot sending rolling: to reduce energy consumption, the slab of the continuous casting forming in step 4 is carried out using hot delivering technology of CC billets technique
Rolling, control parameter when rolling are as follows: 1130~1200 DEG C of heating furnace soaking section temperature of control, so that steel billet uniform well-burnt, permits
Perhaps the temperature difference≤30 DEG C, heating time >=2.5 hour should guarantee that heating steel billet is uniform, prevent decarburization and viscous furnace again.Open rolling temperature
>=1080 DEG C of degree reinforces the control to rolling rhythm, guarantees finishing temperature >=850 DEG C.In the operation of rolling, enhance process control
System, keeps a close eye on the material type situation of each passage, there is not allowed that the defects of scuffing, folding, the ears or side handles of a utensil.Slow cooling is collected after rolling in time to room
Temperature obtains the low-sulfur free-cutting pinion steel.
A certain amount of sulphur, the sulfide point that S and Mn are formed is added in order to improve the cutting abilities of steel in the present invention in steel
Cloth reduces resistance to cutting in steel, has cut off the continuity of matrix and has kept chip easily broken, the lubricating action of MnS reduces knife
The abrasion of tool, so as to improve the processing performance of steel.MnS in steel is extended along rolling direction in the hot rolling, so that steel
Horizontal mechanical performance significantly reduces, and exacerbates the anisotropy of steel mechanics performance, with the increase of S content in steel, this phenomenon
It is more and more prominent, while sulphur is also the harmful element for causing steel hot-short.Comprehensively consider both the above factor, sulfur content control is existed
Between 0.020~0.040%, and guarantee Mn/S, produces low-sulfur free-cutting pinion steel.
Compared with the immediate prior art, technical solution provided by the invention has following excellent effect:
Method by feeding sulphur line after refining can control sulfur content 100% 0.020~0.040%.94% or more
Field trash concentrate between 0~4 μm, be not greater than 10 μm of field trash, field trash is in the distribution of small and dispersed, nothing in steel
By to steel cutting ability or mechanical property it is all highly beneficial.Cutting ability after sulphur is added to significantly improve, cutter life
5 times are improved, production efficiency improves 30%, meets specific demand of the user to cutting rolled steel performance, greatly reduces user
Use cost.
Detailed description of the invention
The distribution metallographic microscope (1500 times of amplification) of field trash, the gold in the low-sulfur free-cutting pinion steel that Fig. 1 present invention obtains
Phasor shows that the field trash of steel grade of the present invention is in the distribution of small and dispersed in steel, greatly improves the cutting ability of steel；
The chip for the low-sulfur free-cutting pinion steel that Fig. 2 a, the b present invention obtain is that C-shaped (Fig. 2 a) is considered to be worth doing with spiral (see figure
2b), chip is in yellow, light blue；
The chip that Fig. 3 present invention obtained be not added sulphur comparative example 1 is mainly in band-like bits, is not easy chip removal, chip be light blue color,
Blue.
Specific embodiment
Any feature is disclosed to obtain in this specification, it unless specifically stated, can be equivalent or with similar purpose by other
Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.It is described to understand the present invention just for the sake of help, it should not be considered as to concrete restriction of the invention.
With the drawings and specific embodiments, the present invention is described in further detail below.
The embodiment of the present invention is smelted using UHP uhp electric arc furnace, LF furnace refines, VD vacuum degassing treatment tech smelting
Refining, continuous casting slab roll technique production steel of becoming a useful person.Below with reference to example, the present invention is further illustrated.
The preparation method of low-sulfur free-cutting pinion steel the following steps are included:
1, electric furnace smelting: feed stock for blast furnace is molten iron and steel scrap, using high quality burden, molten iron percentage 35.19~
64.81%, and add the alloys such as silicomanganese, Gao Meng, high chromium in predetermined component ratio and carry out ladle alloying；Electric furnace smelting is whole
Making foamed slag guarantees good oxidizing boil, and steel inclusion and gas is promoted to float, decarburized amount 0.30~0.88%, control
Terminal [C] 0.10~0.11%, 1636~1655 DEG C of molten steel tapping temperature, tap Shi Liugang, remaining slag operation, forbids slag, out
Steel adds steel-core-aluminium to carry out pre-deoxidation.
2, LF furnace refines: the molten steel for passing through electric furnace smelting in step 1 being carried out the refining of LF furnace, whole process is made white in refining process
Slag, white slag retention time >=15 minute, final deoxidizing is fed aluminium content in aluminum steel control steel and is guaranteed 0.012~0.035% before tapping
Molten steel cleanliness.2~3m/t of titanium wire steel is fed, then feeds CaSi line by 4.0~5.0m/t, carries out inclusions class, it is clean
Net molten steel；Ingredient and fine tune temperature guarantee the performance stabilization and continuous casting process temperature requirement of steel.
3, VD furnace vacuum refining: the molten steel after LF furnace refining in step 2 is carried out to take off Slag treatment, it is de- that molten steel carries out vacuum
Gas, vacuum degree are less than the 67Pa lower retention time greater than 12 minutes, 15~80 meters of sulphur iron wire are fed after breaking vacuum, sulphur in steel is contained
Amount control continues soft blow argon and is greater than 15 minutes, control oxide morphology, avoid occurring bulky grain in steel 0.024~0.031%
Sulphide inculsion.
4, continuous casting: molten steel uses monoblock type Tundish Connection after step 3 processing, is poured using whole process protection, using covering
Lid agent, the special crystallizer covering slag for selecting function admirable, to prevent secondary oxidation of steel, middle packet liquid level is stablized 700
±50mm；Using Prepared by Low Superheat Pouring, middle baotou steel water superheat control mitigates center porosity and segregation at 19~29 DEG C；Crystallization
Device and solidification end use electromagnetic agitation, reduce the tissue defects such as segregation, improve slab quality.Casting uses " constant level, constant temperature
The permanent operation of degree, permanent pulling rate " three, slab is into withdrawal straightening machine temperature >=920 DEG C.
5, hot sending rolling: to reduce energy consumption, the slab of the continuous casting forming in step 4 is carried out using hot delivering technology of CC billets technique
Rolling, control parameter when rolling are as follows: 1130~1200 DEG C of heating furnace soaking section temperature of control, so that steel billet uniform well-burnt, permits
Perhaps the temperature difference≤30 DEG C, heating time >=2.5 hour should guarantee that heating steel billet is uniform, prevent decarburization and viscous furnace again.Open rolling temperature
>=1080 DEG C of degree reinforces the control to rolling rhythm, guarantees finishing temperature >=850 DEG C.In the operation of rolling, enhance process control
System, keeps a close eye on the material type situation of each passage, there is not allowed that the defects of scuffing, folding, the ears or side handles of a utensil.Slow cooling is collected after rolling in time to room
Temperature obtains the low-sulfur free-cutting pinion steel.
Embodiment 1- embodiment 4, comparative example 1
Embodiment 1- embodiment 4, comparative example 1 provide a kind of gear steel respectively, and chemical component is as shown in table 1.
The chemical component table of 1 embodiment 1- embodiment 4 of table, 1 middle gear steel of comparative example
| It is required that | C | Si | Mn | Cr | P | S | Ti | Al |
| Embodiment 1 | 0.19 | 0.21 | 0.95 | 1.09 | 0.022 | 0.024 | 0.062 | 0.012 |
| Embodiment 2 | 0.21 | 0.23 | 1.07 | 1.22 | 0.016 | 0.031 | 0.065 | 0.028 |
| Embodiment 3 | 0.2 | 0.21 | 0.96 | 1.06 | 0.017 | 0.025 | 0.065 | 0.022 |
| Embodiment 4 | 0.19 | 0.21 | 0.98 | 1.07 | 0.011 | 0.025 | 0.066 | 0.022 |
| Comparative example 1 | 0.2 | 0.21 | 0.87 | 1.09 | 0.014 | 0.003 | 0.073 | 0.028 |
Above-mentioned comparative example 1 is made by the following method, specifically includes the following steps:
1, electric furnace smelting: feed stock for blast furnace is molten iron and steel scrap, using high quality burden, molten iron percentage 51.79%, and presses rule
Determine component ratio and adds the alloys such as silicomanganese, Gao Meng, high chromium progress ladle alloying；Electric furnace smelting whole process making foamed slag guarantees
Good oxidizing boil promotes steel inclusion and gas to float, and decarburized amount 1.03% controls terminal [C] 0.15%, and molten steel goes out
1658 DEG C of steel temperature, tap Shi Liugang, remaining slag operation, forbids slag, and tapping plus steel-core-aluminium carry out pre-deoxidation.
2, LF furnace refines: the molten steel for passing through electric furnace smelting in step 1 being carried out the refining of LF furnace, whole process is made white in refining process
Slag, white slag retention time >=15 minute, aluminium content guarantees that molten steel is pure 0.028% in final deoxidizing hello aluminum steel control steel before tapping
Cleanliness feeds titanium wire 3m/t steel, then feeds CaSi line by 4.0m/t, carries out inclusions class, purifying of steel；Ingredient and temperature
Degree fine tuning guarantees the performance stabilization and continuous casting process temperature requirement of steel.
3, VD furnace vacuum refining: the molten steel after LF furnace refining in step 2 is carried out to take off Slag treatment, it is de- that molten steel carries out vacuum
Gas, vacuum degree were less than the 67Pa lower retention time greater than 12 minutes, continued soft blow argon after breaking vacuum and were greater than 15 minutes.
4, continuous casting: molten steel uses monoblock type Tundish Connection after step 3 processing, is poured using whole process protection, using covering
Lid agent, the special crystallizer covering slag for selecting function admirable, prevent secondary oxidation of steel, and middle packet liquid level stablizes 700 ±
50mm；Using Prepared by Low Superheat Pouring, middle baotou steel water superheat control mitigates center porosity and segregation at 19~29 DEG C；Crystallizer
Electromagnetic agitation is used with solidification end, reduces the tissue defects such as segregation, improves slab quality.Casting uses " constant level, constant temperature
The permanent operation of degree, permanent pulling rate " three, slab is into withdrawal straightening machine temperature >=920 DEG C.
5, hot sending rolling: to reduce energy consumption, the slab of the continuous casting forming in step 4 is carried out using hot delivering technology of CC billets technique
Rolling, control parameter when rolling are as follows: 1200 DEG C of heating furnace soaking section temperature of control heating time 2.5 hours, should guarantee steel
Base homogeneous heating prevents decarburization and viscous furnace again.1180 DEG C of start rolling temperature, reinforce the control to rolling rhythm, guarantees finish to gauge temperature
950 DEG C of degree.In the operation of rolling, enhance process to control, keeps a close eye on the material type situation of each passage, there is not allowed that scratch, fold,
The defects of ears or side handles of a utensil.Slow cooling is collected after rolling in time to room temperature, obtains the compared steel 1.
Steel inclusion quantity is in rising trend after feeding sulphur line, is conducive to the cutting ability for improving steel, grain after Calcium treatment
Small-sized the amount of inclusions between 0~2 μm of diameter increases 10.76%, and bulky grain is mingled with reduction, illustrates granularity of inclusions after denaturation
More tend to tiny, 94% or more field trash concentrates between 0~4 μm, is not greater than 10 μm of field trash, therefore field trash exists
It is in the distribution of small and dispersed in steel, it is no matter all highly beneficial to the cutting ability or mechanical property of steel, see Fig. 1.
Embodiment 1- embodiment 4, comparative example 1 take stocking to make cutting sample respectively, see Fig. 2-3, in selected cutting speed model
In enclosing, under identical machining condition, the cutting process of low-sulfur free-cutting pinion steel is steady, and tool life, which is apparently higher than, is not added sulphur
Comparative example 1；The chip of low-sulfur free-cutting pinion steel is C-shaped (Fig. 2 a) with spiral bits (see Fig. 2 b), and exclusion is more smooth, and chip is in
Yellow, light blue, machined surface roughness is lower, shows that low-sulfur free-cutting pinion steel is suitable on numerically-controlled machine tool and machining center
Batch production；In selected parameter area, the cutting process that sulphur comparative example 1 is not added is unstable, and situation of forging a knife is more obvious, cuts
Bits are in mainly band-like bits (see Fig. 3), are not easy chip removal, chip is light blue color, blue, and machined surface roughness is higher.From chip face
Judge on color, the cutting object color that sulphur comparative example 1 is not added is turned blue, what the cutting temperature that sulphur comparative example 1 is not added in judgement was apparently higher than
Low-sulfur free-cutting pinion steel cutting temperature.
The low-sulfur free-cutting pinion steel of technique manufacture through the invention, with performance is stable, crystal grain is tiny, cutting ability
Good, the features such as cutting rear surface is highly polished, the field trash in steel are in the distribution of small and dispersed, no matter to the cutting abilities of steel
Or mechanical property is all highly beneficial.Customer responsiveness adds cutting ability after sulphur to significantly improve, and cutter life improves 5 times, life
It produces efficiency and improves 30%, meet specific demand of the user to cutting rolled steel performance, greatly reduce the use cost of user.
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law,
Embodiment numerous to list herein.
Ordinary skill in the art knowledge can be used in the unspecified content of the present invention.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (2)
1. a kind of low-sulfur free-cutting pinion steel, which is characterized in that pinion steel described in weight percent includes following chemical component:
C:0.17~0.23%, Si:0.17~0.37%, Mn:0.80~1.15%, Cr:1.00~1.35%, P :≤
0.035%, S:0.020~0.040%, Ti :≤0.04~0.10%, Al :≤0.04%, O :≤20 × 10-4%, surplus Fe
And inevitable impurity.
2. the preparation method of low-sulfur free-cutting pinion steel described in claim 1, the preparation method comprises the following steps:
1) electric furnace smelting:
Feed stock for blast furnace is molten iron and steel scrap, it is ensured that molten iron percentage is no less than 40%, electric furnace smelting whole process making foamed slag, decarburized amount
It greater than 0.30%, controls terminal [C] >=0.10%, 1630~1660 DEG C of molten steel tapping temperature, tapping plus steel-core-aluminium carry out pre- take off
Oxygen；
2) LF furnace refines:
The molten steel of electric furnace smelting carries out the refining of LF furnace, and whole process makes white slag, white slag retention time >=15 minute, tapping in refining process
Preceding final deoxidizing feeds aluminium content in aluminum steel control steel and feeds 2~3m/t of titanium wire steel, then press 4.0~5.0m/ 0.010~0.040%
T feeds CaSi line；
3) VD furnace vacuum refining:
Molten steel after the refining of LF furnace carries out taking off Slag treatment, and molten steel carries out vacuum outgas, and it is big that vacuum degree is less than the 67Pa lower retention time
In 12 minutes, sulphur iron wire is fed after breaking vacuum, by sulfur content control in steel 0.020~0.040%, is continued soft blow argon and is greater than
15 minutes；
4) continuous casting:
It using monoblock type Tundish Connection, is poured using whole process protection, middle packet liquid level is stablized in 700 ± 50mm；Using low
Degree of superheat casting, middle baotou steel water superheat control is at 20~30 DEG C；Crystallizer and solidification end use electromagnetic agitation, and slab is into drawing
Rectify machine temperature >=920 DEG C；
5) hot sending rolling:
It is rolled using hot delivering technology of CC billets technique, controls 1130~1200 DEG C of heating furnace soaking section temperature, heating time >=2.5
Hour, start rolling temperature >=1080 DEG C, finishing temperature >=850 DEG C.
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| CN110055374A (en) * | 2019-06-10 | 2019-07-26 | 上海工程技术大学 | A kind of method of added Oxides control automatic steel oxide morphology |
| CN110117747A (en) * | 2019-05-22 | 2019-08-13 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of high Al nitrided steel |
| CN110306009A (en) * | 2019-07-25 | 2019-10-08 | 山东钢铁股份有限公司 | A kind of control method for cutting down low-carbon toothed wheel steel band structure |
| CN111172351A (en) * | 2020-01-17 | 2020-05-19 | 中天钢铁集团有限公司 | Control method for medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel Ds inclusion |
| CN111254353A (en) * | 2020-02-19 | 2020-06-09 | 邯郸钢铁集团有限责任公司 | Production process for improving hardness stability of gear steel 22CrMoH |
| CN111318659A (en) * | 2020-02-29 | 2020-06-23 | 邯郸钢铁集团有限责任公司 | Method for solving nozzle blockage of high-sulfur free-cutting gear steel produced by continuous casting of small square billets |
| CN114107820A (en) * | 2021-11-26 | 2022-03-01 | 宝武集团鄂城钢铁有限公司 | Steel plate with elongation rate more than 30% and good cutting performance and production method thereof |
| CN114393182A (en) * | 2022-01-28 | 2022-04-26 | 江苏联峰能源装备有限公司 | Control method for sulfide form of free-cutting gear steel |
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| CN109988972A (en) * | 2019-04-23 | 2019-07-09 | 中天钢铁集团有限公司 | A kind of low-carbon sulfur-bearing air conditioner tube round steel and its production technology |
| CN110117747A (en) * | 2019-05-22 | 2019-08-13 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of high Al nitrided steel |
| CN110055374A (en) * | 2019-06-10 | 2019-07-26 | 上海工程技术大学 | A kind of method of added Oxides control automatic steel oxide morphology |
| CN110306009A (en) * | 2019-07-25 | 2019-10-08 | 山东钢铁股份有限公司 | A kind of control method for cutting down low-carbon toothed wheel steel band structure |
| CN111172351B (en) * | 2020-01-17 | 2021-07-30 | 中天钢铁集团有限公司 | Control method for medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel Ds inclusion |
| CN111172351A (en) * | 2020-01-17 | 2020-05-19 | 中天钢铁集团有限公司 | Control method for medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel Ds inclusion |
| CN111254353A (en) * | 2020-02-19 | 2020-06-09 | 邯郸钢铁集团有限责任公司 | Production process for improving hardness stability of gear steel 22CrMoH |
| CN111318659A (en) * | 2020-02-29 | 2020-06-23 | 邯郸钢铁集团有限责任公司 | Method for solving nozzle blockage of high-sulfur free-cutting gear steel produced by continuous casting of small square billets |
| CN114107820A (en) * | 2021-11-26 | 2022-03-01 | 宝武集团鄂城钢铁有限公司 | Steel plate with elongation rate more than 30% and good cutting performance and production method thereof |
| CN114393182A (en) * | 2022-01-28 | 2022-04-26 | 江苏联峰能源装备有限公司 | Control method for sulfide form of free-cutting gear steel |
| CN114393182B (en) * | 2022-01-28 | 2024-02-06 | 江苏联峰能源装备有限公司 | Method for controlling sulfide morphology of free-cutting gear steel |
| CN115198058A (en) * | 2022-06-24 | 2022-10-18 | 石家庄钢铁有限责任公司 | Smelting method of low-carbon low-sulfur ultra-low-silicon welding wire steel |
| CN115198058B (en) * | 2022-06-24 | 2023-10-27 | 石家庄钢铁有限责任公司 | Smelting method of low-carbon low-sulfur ultralow-silicon welding wire steel |
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