CN107385177A - Medium carbon steel skin decarburization controls hot rolling wire production technology - Google Patents
Medium carbon steel skin decarburization controls hot rolling wire production technology Download PDFInfo
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- CN107385177A CN107385177A CN201710417372.8A CN201710417372A CN107385177A CN 107385177 A CN107385177 A CN 107385177A CN 201710417372 A CN201710417372 A CN 201710417372A CN 107385177 A CN107385177 A CN 107385177A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The present invention relates to a kind of medium carbon steel skin decarburization to control hot rolling wire production technology, including blank prepares, heated, rolling, spinning/collection is rolled up, it is cold to control（It is incubated slow cooling）, packaging etc. key step.Blank peels off one layer of oxide skin of blank surface, it is therefore intended that remove the decarburized layer on blank by process of refinement such as peeling, reconditioning processing.Blank is become a useful person using two fire, increases by a procedure, eliminates surface defect and decarburized layer.Reacted relational expression in heating process by studying blank and furnace gas, control furnace gas atmosphere using the composition for detecting reaction residual, that is, find out rational combustion gas and air stoichiometry.Different steel grade Decarburization Sensitivities are studied, by adjusting step pitch and empty step in heating furnace, shorten preform heating time.Wire rod is by spinning/collection plume journey, then is incubated, using insulation slow cooling（Equivalent to reheating）Decarburized layer deepness increase afterwards；Research decarburization mechanism of production increases protective gas in stay-warm case, avoids decarburization from deepening.
Description
Technical field
The present invention relates to wire rolling production technology, and in particular to the wire rolling producer of medium carbon steel skin decarburization control
Method.
Background technology
Medium carbon steel wire rod Decarburization Control production technology mainly includes：Blank preparation, heating, groove rolling, spinning/collection
Roll up, control cold, finishing, and medium carbon steel blank specification, type are single at present, blank surface defect is more, and heating-up temperature, time are difficult to
Control, hot dirty gas composition is unstable, and it is immature to control cold technique, cause at present on the market finished product decarbonization process do not reach Gao Shui
It is flat.Medium carbon steel carbon content is high, and Decarburization Control is especially difficult in process of production, and there is presently no effective Decarburization Control technique.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of medium carbon steel skin decarburization control for above-mentioned prior art
Hot rolling wire production technology, solves the big technical barrier of medium carbon steel skin decarburization control difficulty, optimization medium carbon steel is in wire rolling
The control technique of skin decarburization during production.
Technical scheme is used by the present invention solves the above problems：A kind of medium carbon steel skin decarburization control hot rolling wire life
Production. art, comprise the following steps,
S1：Blank prepares, and using medium carbon steel continuous casting billet as raw material, rolls into square steel：490*610mm continuous casting billets are heated, are rolled into 200
Side is to 140 side's small billets, 1200~1300 DEG C of heating-up temperature, heat time >=8 hour, start rolling temperature >=1050 DEG C, in roll temperature
>=900 DEG C of degree, be rolled into needed for slow cooling after small billet, high temperature controlled rolling is carried out to continuous casting billet by heating rolling into small billet,
Change blank interior tissue, grain size and uniformly nothing is mingled with；
Square shaped steel billet, stacked by level, in groined type, surface fine processing then is carried out to blank：Round and smooth turning, beat
Mill, peels off one layer of oxide skin of blank surface, it is therefore intended that removes the decarburized layer on blank；
S2：Heat, square steel is sent in step heating-furnace and heated, raw material is evenly distributed in stove, equidistantly heating；Roll one
Zhi Jinyi branch, waits the time to heat up；Four sections of walking-beam furnace point：It is preheating section, one section, two sections, equal section successively, partition wall is added between section and section
Every section of temperature is not influenceed by other sections；Every section is uniformly arranged four temperature measuring points, it is ensured that front and rear temperature is uniform in section, and burner is freely controlled
Heating-up temperature processed, square billet head, middle and end temperature difference≤30 DEG C；Every section of residual oxygen detection means of installation, residual oxygen control：Adjusted by air-fuel ratio
It is whole, every section of air-fuel ratio difference, preheating section air-fuel ratio 0.35~0.70, one section of air-fuel ratio 0.47~0.75, equal section air-fuel ratio 0.75
~0.95, corresponding every section of residual oxygen do not control ≤4.5% ,≤6.5% ,≤7% ,≤8%；
The heating-up temperature of walking-beam furnace and time：Different steel grade Decarburization Sensitivities are studied, by adjusting step pitch and empty step in heating furnace,
For phosphorus content such as 50BV30,30CrMnTi in the steel grade of 0.25~0.35% scope, blank made a move an empty step, and step pitch is set
For 260mm, heat time control is≤120min；For the phosphorus content such as 42CrNiMoA, SCM440, B7,40Cr 0.36~
The steel grade of 0.45% scope, blank make a move an empty step, and step pitch is arranged to 310mm, and heat time control is≤100min；
S3：Rolling：By rolling in roughing, heating, one, being rolled in two, pre- finish rolling, reducing sizing mill by billet rolling into section be circle
Wire rod, its velocity interval are 2.0m/s~15m/s；Enter 900~1000 DEG C of roughing temperature, rolled in entering（Roll in one, rolled in two）, it is pre-
850~950 DEG C of final rolling temperature, enter 800~900 DEG C of reducing sizing mill temperature, head and tail temperature difference control is≤30 DEG C, is playing equipment energy
The maximized situation of power is rolled according to low temperature, advantageously reduces the decarburization that red steel occurs in the operation of rolling；
S4：Spinning/collection volume：The wire rod rolled in step S3 is changed into by ring shape using collection reel, wire-rod roll is obtained, tells
Silk/collection volume temperature is 750~1000 DEG C；
S5：Control cold：Wire rod finished product in step S4 is collected using sealing heat, case can be realized by filling protective gas into case
Interior anaerobic, duration is not less than 70min in case, goes out incubator temperature no more than 400 DEG C, cooling velocity is 3.5~30 DEG C/min；
S6：Packaging, the wire rod in step S5 is carried out to upper C-shaped hook-P/F lines transport cooling-hot inspection-haircut tail successively and beaten
Bundle-packaging and storage.
Preferably, in step S1, automobile steel blank 0.8~2.0mm of barking depth, corner barking depth 1.0~
3.0mm, the round and smooth processing in corner are local to carry out artificial reconditioning.
In step S2, preheating section temperature requirement≤700 DEG C, two sections of temperature of cold-heading class steel are 850~1100 DEG C, equal temperature section
For 900~1150 DEG C, the high temperature section time, total heat time avoided low-temperature zone area in 120~180min in 40~90min
Between.
Preferably, de-scaling step is also set up between step S2 and S3, de-scaling processing, hydraulic pressure are carried out to blank using water under high pressure
Not less than 18MPa, prepared for wire rod rolling.
Preferably, also there is water-cooling step between step S3 and S4, water cooling, domination set volume are carried out using the water cooling tubes of Φ 40
Temperature, but need to ensure that temperature is more than 750 DEG C during rolled piece collection volume.
Preferably, step S3 roughing and in roll between using sensing stove heat blank, heat time 60-80min, work(
Rate is 2-55HZ, and blank temperature is heated into more than 990 DEG C.
Preferably, in step S5, Steel for cold heading processing, which uses, is incubated retarded cooling process, 3.5~10.0 DEG C/min of cooling velocity, commonly
Air cooling technique, 10~20 DEG C/min of cooling velocity are used with steel.
Further, in step S5, the cold technology controlling and process means of different steel grade controls are different：For 50BV30,30CrMnTi
Stay-warm case is capped in course of conveying after the steel grade collection volume of 0.25%~0.35% scope etc. phosphorus content, enters stay-warm case temperature 700
~850 DEG C, go out stay-warm case temperature≤550 DEG C, cooldown rate≤10 DEG C/min, 40~60min of soaking time；For
The phosphorus content such as 2CrNiMoA, SCM440, B7,40Cr use Vacuum Heat collection side after the steel grade collection volume of 0.36%~0.45% scope
Formula is incubated slow cooling, enters 750~900 DEG C of collection device temperature, goes out collection device temperature≤400 DEG C, 50~80min of soaking time,
Temperature drop rate≤8 DEG C/min.
Compared with prior art, improvement of the invention include it is following some：
1st, blank
（1）Original blank is only handled by ball blast, reconditioning, removes surface defect；Existing blank is by peeling, at reconditioning
Reason, that is, peel off one layer of oxide skin of blank surface, it is therefore intended that removes the decarburized layer on blank.
（2）Original blank one-heating forming, present blank, which makes two fire into, becomes a useful person, and increases by a procedure, it is therefore intended that eliminates table
Planar defect and decarburized layer；
2nd, computer heating control
（1）Original computer heating control means are single, only by temperature, time control, reacted by studying blank with furnace gas
Relational expression, furnace gas atmosphere is controlled using the composition for detecting reaction residual, that is, finds out rational combustion gas and air stoichiometry.
Blank main component is Fe, C and a small amount of alloying element, and furnace gas composition is CO, CH4, CO2, H2O（Gas）、O2；Decarburization master
The reaction to be occurred is that the O2 in C and stove in blank reacts, produce CO and CO2, while blank again with stove it is other its
Its gas occurs, and this is a complicated chemical reaction process.Consider that the application is by detecting in whole stove from reliability
Residual gas O2 contents control combustion gas and air capacity.
（2）Heating-up temperature and the improvement of time：Study different steel grade Decarburization Sensitivities, by adjust in heating furnace step pitch and
Sky step, shortens preform heating time, by original 120min, foreshortens to 55min；Such as 50BV30 steel grade heat time 70min,
SCM410 heat times 46min, 35CrMo heat time 59min.
3rd, cold technique is controlled：Wire rod is by spinning/collection plume journey, then is incubated（Step S5 air coolings）, using insulation slow cooling
（Equivalent to reheating）Decarburized layer deepness increase afterwards；Research decarburization mechanism of production increases protective gas in stay-warm case, keeps away
Exempt from decarburization deterioration.
The advantage of the invention is that being worked out according to steel grade a set of from blank to the Decarburization Control technique become a useful person, have unique
Property.Tissue is improved, optimizes medium carbon steel skin decarburization when wire rolling produces.
Embodiment
The present invention is described in further detail below in conjunction with attached embodiment.
Medium carbon steel skin decarburization controls hot rolling wire production technology, comprises the following steps,
S1：Blank prepares, and using medium carbon steel continuous casting billet as raw material, rolls into square steel, rolling mill practice：490*610mm continuous casting billets are heated,
It is rolled into 200 sides and 140 side's small billets, 1200~1300 DEG C of heating-up temperature, heat time >=8 hour, start rolling temperature >=1050
DEG C, in roll temperature >=900 DEG C, be rolled into needed for slow cooling after small billet, slow cooling 24-48 hours, high temperature controlled rolling is carried out to continuous casting billet,
Blank interior tissue, grain size are homogenized, avoids grain size from excessively growing up, and uniformly nothing is mingled with；
Square shaped steel billet, stacked by level, in groined type, surface fine processing then is carried out to blank：Ball blast, circular pulley
Cut, polish, peel off one layer of oxide skin of blank surface, it is therefore intended that remove the decarburized layer on blank；Barking depth 0.8~
2.0mm, corner 1.0~3.0mm of barking depth, the round and smooth processing in corner（Chamfering）, it is local to carry out artificial reconditioning.
S2：Heat, square steel is sent in step heating-furnace and heated, raw material is evenly distributed in stove, equidistantly heating；
Roll one and enter one, wait the time to heat up；Four sections of walking-beam furnace point：It is preheating section, one section, two sections, equal section successively, adds between section and section
Every section of temperature of partition wall is not influenceed by other sections；Every section is uniformly arranged four temperature measuring points, it is ensured that front and rear temperature is uniform in section, and burner is certainly
By control heating-up temperature, square billet head, middle and end temperature difference is not higher than 30 DEG C；Every section of residual oxygen detection means of installation, residual oxygen control：Pass through
Air-fuel ratio adjusts, every section of air-fuel ratio difference, preheating section air-fuel ratio 0.35~0.70, one section of air-fuel ratio 0.47~0.75, and equal section is empty
Fire ratio 0.75~0.95, corresponding every section of residual oxygen do not control ≤4.5% ,≤6.5% ,≤7% ,≤8%；
The heating-up temperature of walking-beam furnace and time：Different steel grade Decarburization Sensitivities are studied, by adjusting step pitch and empty step in heating furnace,
For phosphorus content such as 50BV30,30CrMnTi in the steel grade of 0.25~0.35% scope, blank made a move an empty step, and step pitch is set
For 260mm, heat time control is≤120min；For the phosphorus content such as 42CrNiMoA, SCM440, B7,40Cr 0.36~
The steel grade of 0.45% scope, blank make a move an empty step, and step pitch is arranged to 310mm, and heat time control is≤100min；
S3：Rolling：By rolling in roughing, heating, one, being rolled in two, pre- finish rolling, reducing sizing mill by billet rolling into section be circle
Wire rod, its velocity interval are 2.0m/s~15m/s；Enter 900~1000 DEG C of roughing temperature, rolled in entering（Roll in one, rolled in two）, it is pre-
850~950 DEG C of final rolling temperature, enter 800~900 DEG C of reducing sizing mill temperature, head and tail temperature difference control is≤30 DEG C, is playing equipment energy
The maximized situation of power advantageously reduces the decarburization that red steel occurs in the operation of rolling according to zerolling；
S4：Spinning/collection volume：The wire rod rolled in step S3 is changed into by ring shape using collection reel, wire-rod roll is obtained, tells
Silk/collection volume temperature is 750~1000 DEG C；
S5：Control cold（It is incubated slow cooling）：Wire rod finished product in step S4 is collected using sealing heat, anaerobic, the duration in case in case
Not less than 70min, go out incubator temperature no more than 400 DEG C, cooling velocity is 3.5~30 DEG C/min；The different cold works of steel grade control
Skill control device is different：Wherein, for phosphorus content such as 50BV30,30CrMnTi after the steel grade collection volume of 0.25%~0.35% scope
Stay-warm case is capped in course of conveying, enters 700~850 DEG C of stay-warm case temperature, goes out stay-warm case temperature≤550 DEG C, cooldown rate≤
10 DEG C/min, 40~60min of soaking time；For phosphorus content such as 2CrNiMoA, SCM440, B7,40Cr 0.36%~0.45%
Using the insulation slow cooling of Vacuum Heat collection mode after the steel grade collection volume of scope, enter 750~900 DEG C of collection device temperature, go out to collect dress
Put temperature≤400 DEG C, 50~80min of soaking time, temperature drop rate≤8 DEG C/min.
S6：Packaging, the wire rod in step S5 is carried out to upper C-shaped hook-P/F lines transport cooling-hot inspection-haircut tail successively
Bundling-packaging and storage.
In step S2, preheating section temperature requirement≤700 DEG C, two sections of temperature of cold-heading class steel are 850~900 DEG C, equal temperature section
For 1150 DEG C, the high temperature section time, total heat time avoided low-temperature zone section in 120~180min in 40~90min.
De-scaling step is also set up between step S2 and S3, de-scaling processing is carried out to blank using water under high pressure, hydraulic pressure is
18MPa, prepared for wire rod rolling.
Also there is water-cooling step between step S3 and S4, water cooling is carried out using the water cooling tubes of Φ 40, domination set rolls up temperature, but
It need to ensure that temperature is more than 750 DEG C during rolled piece collection volume.
Step S3 roughing and in roll between using sensing stove heat blank, heat time 60-80min, power 2-
55HZ, blank temperature is heated to more than 990 DEG C.
In step S5, Steel for cold heading processing is adopted using insulation retarded cooling process, 3.5~10.0 DEG C/min of cooling velocity, general primary steel
With air cooling technique, 10~20 DEG C/min of cooling velocity.
Decarburization quality versus before and after process improving：
| Specification/mm | Decarburized depth/mm before improvement | Decarburized depth/mm after improvement |
| Φ5.5-10 | 0.08mm | 0.04mm |
| Φ10.5-20 | 0.22mm | 0.07mm |
| Φ20.5-30 | 0.35mm | 0.12mm |
| Φ30.5-40 | 0.38mm | 0.15mm |
In addition to the implementation, present invention additionally comprises have other embodiment, all use equivalent transformation or equivalent replacement modes
The technical scheme of formation, it all should fall within the scope of the hereto appended claims.
Claims (8)
1. a kind of medium carbon steel skin decarburization controls hot rolling wire production technology, it is characterised in that：Comprise the following steps,
S1：Blank prepares, and using medium carbon steel continuous casting billet as raw material, rolls into square steel：490*610mm continuous casting billets are heated, are rolled into 200
Side is to 140 side's small billets, 1200~1300 DEG C of heating-up temperature, heat time >=8 hour, start rolling temperature >=1050 DEG C, in roll temperature
>=900 DEG C of degree, be rolled into needed for slow cooling after small billet, high temperature controlled rolling is carried out to continuous casting billet by heating rolling into small billet,
Change blank interior tissue, grain size and uniformly nothing is mingled with；
Square shaped steel billet, stacked by level, in groined type, surface fine processing then is carried out to blank：Round and smooth turning, beat
Mill, peels off one layer of oxide skin of blank surface, it is therefore intended that removes the decarburized layer on blank；
S2：Heat, square steel is sent in step heating-furnace and heated, raw material is evenly distributed in stove, equidistantly heating；Roll one
Zhi Jinyi branch, waits the time to heat up；Four sections of walking-beam furnace point：It is preheating section, one section, two sections, equal section successively, partition wall is added between section and section
Every section of temperature is not influenceed by other sections；Every section is uniformly arranged four temperature measuring points, it is ensured that front and rear temperature is uniform in section, and burner is freely controlled
Heating-up temperature processed, square billet head, middle and end temperature difference≤30 DEG C；Every section of residual oxygen detection means of installation, residual oxygen control：Adjusted by air-fuel ratio
It is whole, every section of air-fuel ratio difference, preheating section air-fuel ratio 0.35~0.70, one section of air-fuel ratio 0.47~0.75, equal section air-fuel ratio 0.75
~0.95, corresponding every section of residual oxygen do not control ≤4.5% ,≤6.5% ,≤7% ,≤8%；
The heating-up temperature of walking-beam furnace and time：Different steel grade Decarburization Sensitivities are studied, by adjusting step pitch and sky in heating furnace
Step,：For phosphorus content such as 50BV30,30CrMnTi in the steel grade of 0.25%~0.35% scope, blank makes a move an empty step, step pitch
260mm is arranged to, heat time control is≤120min；Exist for phosphorus content such as 42CrNiMoA, SCM440, B7,40Cr
The steel grade of 0.36%~0.45% scope, blank make a move an empty step, and step pitch is arranged to 310mm, heat time control for≤
100min；
S3：Rolling：By rolling in roughing, heating, one, being rolled in two, pre- finish rolling, reducing sizing mill by billet rolling into section be circle
Wire rod, its velocity interval are 2.0m/s~15m/s；Enter 900~1000 DEG C of roughing temperature, rolled in entering（Roll in one, rolled in two）、
Pre- 850~950 DEG C of final rolling temperature, enter 800~900 DEG C of reducing sizing mill temperature, head and tail temperature difference control is≤30 DEG C, is playing equipment
The maximized situation of ability is rolled according to low temperature, advantageously reduces the decarburization that red steel occurs in the operation of rolling；
S4：Spinning/collection volume：The wire rod rolled in step S3 is changed into by ring shape using collection reel, wire-rod roll is obtained, tells
Silk/collection volume temperature is 750~1000 DEG C；
S5：Control cold：Wire rod finished product in step S4 is collected using sealing heat, case can be realized by filling protective gas into case
Interior anaerobic, duration is not less than 70min in case, goes out incubator temperature no more than 400 DEG C, cooling velocity is 3.5~30 DEG C/min；
S6：Packaging, the wire rod in step S5 is carried out to upper C-shaped hook-P/F lines transport cooling-hot inspection-haircut tail successively and beaten
Bundle-packaging and storage.
2. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S1
In, automobile steel blank 0.8~2.0mm of barking depth, corner 1.0~3.0mm of barking depth, the round and smooth processing in corner, locally enter
Pedestrian's work reconditioning.
3. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S2
In, preheating section temperature requirement≤700 DEG C, two sections of temperature of cold-heading class steel are 850~1100 DEG C, and equal temperature section is 900~1150 DEG C,
The high temperature section time, total heat time avoided low-temperature zone section in 120~180min in 40~90min.
4. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S2
De-scaling step is also set up between S3, de-scaling processing is carried out to blank using water under high pressure, hydraulic pressure is not less than 18MPa.
5. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S3
Also there is water-cooling step between S4, water cooling is carried out using the water cooling tubes of Φ 40, but need to ensure that temperature is more than 750 during rolled piece collection volume
℃。
6. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S3
Roughing and in roll between using sensing stove heat blank, heat time 60-80min, power 2-55HZ, by blank temperature
It is heated to more than 990 DEG C.
7. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S5
In, Steel for cold heading processing uses air cooling technique using insulation retarded cooling process, 3.5~10.0 DEG C/min of cooling velocity, general primary steel, cools down
10~20 DEG C/min of speed.
8. medium carbon steel skin decarburization according to claim 1 controls hot rolling wire production technology, it is characterised in that：Step S5
In, the cold technology controlling and process means of different steel grade controls are different：Wherein, for the phosphorus content such as 50BV30,30CrMnTi 0.25%~
Stay-warm case is capped in course of conveying after the steel grade collection volume of 0.35% scope, enters 700~850 DEG C of stay-warm case temperature, goes out stay-warm case temperature
≤ 550 DEG C of degree, cooldown rate≤10 DEG C/min, 40~60min of soaking time；For 2CrNiMoA, SCM440, B7,40Cr etc.
Phosphorus content, using the insulation slow cooling of Vacuum Heat collection mode, enters collection device temperature after the steel grade collection volume of 0.36%~0.45% scope
750~900 DEG C, go out collection device temperature≤400 DEG C, 50~80min of soaking time, temperature drop rate≤8 DEG C/min.
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| CN108034292A (en) * | 2017-12-06 | 2018-05-15 | 博维恩冷冻科技（苏州）有限公司 | A kind of high intensity wear-resistant sheet metal component and its production technology |
| CN108097736A (en) * | 2017-11-29 | 2018-06-01 | 南京钢铁股份有限公司 | A kind of control method of piston rod wire rod quality |
| CN109385516A (en) * | 2018-10-26 | 2019-02-26 | 福建三钢闽光股份有限公司 | A kind of method of determining heater for rolling steel decarbonization process parameter |
| CN111872130A (en) * | 2020-07-17 | 2020-11-03 | 安阳复星合力新材料股份有限公司 | High-speed cold rolling pretreatment process method |
| CN112251578A (en) * | 2020-09-04 | 2021-01-22 | 南京钢铁股份有限公司 | Surface full decarburization control method for small-size wire spring steel 55SiCrA |
| CN113957211A (en) * | 2021-10-27 | 2022-01-21 | 宝武杰富意特殊钢有限公司 | Heating control method for preventing decarburization of steel bar of hot-rolled caterpillar track link |
| CN114405991A (en) * | 2022-03-01 | 2022-04-29 | 张家港荣盛特钢有限公司 | Cogging method for reducing surface decarburization depth of medium-high carbon steel blank |
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| CN109385516A (en) * | 2018-10-26 | 2019-02-26 | 福建三钢闽光股份有限公司 | A kind of method of determining heater for rolling steel decarbonization process parameter |
| CN111872130A (en) * | 2020-07-17 | 2020-11-03 | 安阳复星合力新材料股份有限公司 | High-speed cold rolling pretreatment process method |
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| CN114405991A (en) * | 2022-03-01 | 2022-04-29 | 张家港荣盛特钢有限公司 | Cogging method for reducing surface decarburization depth of medium-high carbon steel blank |
| CN114405991B (en) * | 2022-03-01 | 2024-07-02 | 张家港荣盛特钢有限公司 | Cogging method for reducing decarburization depth of surface of medium-high carbon steel blank |
| CN116890031A (en) * | 2023-07-31 | 2023-10-17 | 辛集市澳森特钢集团有限公司 | Method for producing spring steel without full decarburization without grinding |
| CN116890031B (en) * | 2023-07-31 | 2024-06-04 | 辛集市澳森特钢集团有限公司 | Method for producing spring steel without full decarburization without grinding |
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