CN104195282B - Zero-turriform-hairline control method of 35MnBM for engineering machinery - Google Patents
Zero-turriform-hairline control method of 35MnBM for engineering machinery Download PDFInfo
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- CN104195282B CN104195282B CN201410405428.4A CN201410405428A CN104195282B CN 104195282 B CN104195282 B CN 104195282B CN 201410405428 A CN201410405428 A CN 201410405428A CN 104195282 B CN104195282 B CN 104195282B
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Abstract
The invention belongs to the technical field of steelmaking, and particularly relates to a zero-turriform-hairline control method of 35MnBM for engineering machinery. The invention aims to improve the internal quality of the 35MnBM for engineering machinery, thereby achieving the goal of zero turriform hairline. A molten steel ultrapurity control technique is adopted in the steelmaking process, and a large compression ratio and high-temperature hydrogen diffusion slow cooling technique is adopted in the steel rolling process, so that the contents of inclusions and gas in the steel achieve the expected goals, thereby implementing zero turriform hairline of the finished product and ensuring the workability of the product.
Description
Technical field
The invention belongs to the technical field of steel-making, specially engineering machinery 35mnbm zero turriform hairline control method.
Background technology
Turriform hairline is mainly a, c type impurity and loose, gas content (mainly h in steel2Produce hydrogen embrittlement) etc.
Caused by being extended along forging rolling direction during the machining deformation of steel.
Steel for engineering machinery requires very big ratio of forging reduction, reaches as high as 1/4 forging and stamping, therefore required steel is proposed non-
Often strict requirements, and how many turriform hairlines directly affects the warm and hot forging performance of steel.Hairline severely compromises the mechanics of steel
Performance, particularly fatigue strength etc., the quantity to hairline for the steel, size and distribution for manufacturing important parts have sternly
The restriction of lattice.Therefore, the origin cause of formation for turriform hairline being controlled by by optimize technique, becomes industry to eliminate turriform hairline
The emphasis of interior research.
Content of the invention
It is an object of the invention to solving the internal soundness of engineering type 35mnbm, to reach the mesh of zero turriform hairline
's.Steelmaking process adopts molten steel ultrapure cleanliness control technology, and rolling process adopts big compression ratio and high temperature hydrogen to spread slow cooling technology,
Steel inclusion and gas content is made to reach expected purpose, it is achieved thereby that zero turriform hairline of finished product is it is ensured that product
Processing characteristics.
The technical scheme is that
Engineering machinery 35mnbm zero turriform hairline control method, specifically comprises the following steps that
(1): fully carry out former auxiliary material, the baking of ferroalloy, reduce external hydrogen source；
Tundish is toasted, using the baking time of 6-8 hour, 1000-1200 DEG C of baking temperature is it is ensured that tundish
After baking, temperature control is more than 1100 DEG C；Using box layering oven, coverture and covering slag are toasted, baking temperature
Spend for 200-300 DEG C, baking time 3-4 hour；Ferroalloy is toasted using alloy baking stove, baking temperature controls
300-500 DEG C, baking time 4-6 hour；Reach the purpose of moisture removal by aforesaid operations, thus effectively reducing external hydrogen
Source；
(2): rational lf slagging regime, the sufficient low Argon gas agitating of cooperation adds the enough soft blow time it is ensured that pressing from both sides
The abundant floating of debris；Super subnormal ambient created by vd vacuum refining furnace, is de-gassed further and goes to be mingled with process；
Carry out deep deoxidation by adding the aluminium ingot of purity >=99% after Converter；Lf refining process adopts high basicity slag in 4-6
System, the big quantity of slag operation of 1-1.2 ton carries out deoxidation, desulfurization operations；Low Argon gas agitating adds soft blow time >=20 minute；
Vd vacuum refining process vacuum≤66.5pa, and keep the vacuum retention time of 10-15 minute；
(3): the cast of casting process whole process protection, low overheat, permanent pulling rate casting, and coordinate first and end electromagnetic agitation, fall
Low strand column crystal rate, improves Center Equiaxial Crystal rate, reduces that strand is loose and segregation with effective；
Casting process safeguard measure: protective casting is carried out using big bag long nozzle and submersed nozzle；In the middle of bilayer
Covering agent and special crystallizer covering slag carry out molten steel covering protection, on the one hand can effectively prevent the secondary oxidation of molten steel, separately
On the one hand the effect of further dross inclusion adsorption can be played；
Casting process controls rational molten steel overheat, is controlled in the range of≤30 DEG C, and coordinates permanent pulling rate behaviour
Make, reduce the fluctuation in molten steel face, stablize slab quality；By electromagnetic agitation is coordinated using m-ems and f-ems first and last, reduce partially
The generation of analysis；
(4): steel-making, rolling process adopt high temperature hydrogen to spread slow cooling technology, reduce gas content further；
Interval according to hydrogen diffusion temperature, ensure strand in time, stocking enters to cheat slow cooling on hydrogen diffusion temperature it is ensured that hydrogen
Abundant diffusion, the entering to cheat slow cooling temperature and should control more than 450 DEG C of strand and stocking, and when temperature be reduced to 100 DEG C it
Before, do not allow to cheat.
The feature of the present invention also has:
In described step (2), the soft blow time is 20-40 minute it is ensured that the abundant floating of field trash.
In described step (2), vd vacuum refining process vacuum is 66.5-20pa, and keeps the true of 10-15 minute
The empty retention time, to reach further degassing and to go the purpose being mingled with.
In described step (3), casting process controls rational molten steel overheat, is controlled the scope at 15-30 DEG C
Interior.
In described step (4), the entering to cheat slow cooling temperature and should control at 450-560 DEG C of strand and stocking；Preferably, casting
The entering to cheat slow cooling temperature and should control at 500 DEG C of base and stocking.
In described step (4), slow cooling to the temperature that enters to cheat of strand and stocking is reduced to 80-100 DEG C and has started to cheat, as
Preferably, slow cooling to the temperature that enters to cheat of strand and stocking is reduced to 90 DEG C and has started to cheat.
The invention has the benefit that
(1) product push away through mountain, the forging of Jinan Jilong on probation, and through oversampling magnetic powder inspection, product flawless exists, and produces
Product qualification rate reaches 100%.
(2) product is checked through national steel products Quality Supervision and Inspection Center, Shan Tui clinical laboratory, and all no turriform hairline is deposited
?.
Following part detection datas for national steel products Quality Supervision and Inspection Center
Trade mark 35mnbm, specification (diameter) 80mm.
1. chemical composition is shown in Table 1.
Table 1
2. macrostructure
0.5 grade of General Loosen, 1.0 grades of center porosity, 0.5 grade of pattern segregation, 0 grade of general spot segregation, edge point-like
0 grade of segregation.
3. turriform hairline
3 ladders are to find hairline.
4. non-metallic inclusion (level)
A class: be carefully 0.5
It is slightly 0
B class: be carefully 1.0
It is slightly 0
C class: be carefully 0
It is slightly 0
D class: be carefully 1.0
It is slightly 0
Ds class: 0.
5. grain size (level) 7.0.
6. decarburized layer deepness 0.628mm.
7. quenching degree (hrc) j1.5:55.5；J13:49.8；j19:39.6.Quenching degree heat treating regime requires: normalizing
900℃；End quenching temperature: 870 DEG C.
Maximum nitride size (μm) 11.17.
Specific embodiment
Below by specific embodiment, technical scheme is described in detail.
Embodiment 1
Engineering machinery 35mnbm zero turriform hairline control method, specifically comprises the following steps that
(1): fully carry out former auxiliary material, the baking of ferroalloy, reduce external hydrogen source；
Tundish is toasted, using the baking time of 6 hours, 1200 DEG C of baking temperature was it is ensured that after baking of tundish
Temperature control is more than 1100 DEG C；Using box layering oven, coverture and covering slag are toasted, baking temperature is 200
DEG C, baking time 4 hours；Ferroalloy is toasted using alloy baking stove, baking temperature controls at 300 DEG C, during baking
Between 6 hours；Reach the purpose of moisture removal by aforesaid operations, thus effectively reducing external hydrogen source；
(2): rational lf slagging regime, the sufficient low Argon gas agitating of cooperation adds the enough soft blow time it is ensured that pressing from both sides
The abundant floating of debris；Super subnormal ambient created by vd vacuum refining furnace, is de-gassed further and goes to be mingled with process；
Pass through after Converter to add enough aluminium ingots (purity >=99%) to carry out deep deoxidation；Lf refining process adopts high in 4-6
Basicity slag system, the big quantity of slag operation of 1-1.2 ton carries out deoxidation, desulfurization operations；Guarantee to press from both sides by the 20 minutes sufficient soft blow time
The abundant floating of debris；
Vd vacuum refining process passes through to create super subnormal ambient, and vacuum 20pa, when the vacuum of cooperation 10-15 minute keeps
Between, to reach further degassing and to go the purpose being mingled with；
(3): the cast of casting process whole process protection, low overheat, permanent pulling rate casting, and coordinate first and end electromagnetic agitation, fall
Low strand column crystal rate, improves Center Equiaxial Crystal rate, dredges that strand is loose and segregation with effective reduction；
Casting process safeguard measure: protective casting is carried out using big bag long nozzle and submersed nozzle；In the middle of bilayer
Covering agent and special crystallizer covering slag carry out molten steel covering protection, on the one hand can effectively prevent the secondary oxidation of molten steel, separately
On the one hand the effect of further dross inclusion adsorption can be played.
Casting process controls rational molten steel overheat, is controlled in the range of 30 DEG C, and coordinates permanent pulling rate operation,
Reduce the fluctuation in molten steel face, stablize slab quality.By electromagnetic agitation is coordinated using m-ems and f-ems first and last, reduce segregation
Produce.
(4): steel-making, rolling process adopt high temperature hydrogen to spread slow cooling technology, reduce gas content further；
Root hydrogen diffusion temperature is interval, ensures that strand, stocking enter to cheat slow cooling it is ensured that hydrogen on hydrogen diffusion temperature in time
Fully spread.Strand and become a useful person enter to cheat slow cooling temperature and should control at 560 DEG C, and when temperature is reduced to 80 DEG C before, do not permit
Permitted to cheat.
Embodiment 2
Engineering machinery 35mnbm zero turriform hairline control method, specifically comprises the following steps that
(1): fully carry out former auxiliary material, the baking of ferroalloy, reduce external hydrogen source；
Tundish is toasted, using the baking time of 8 hours, 1100 DEG C of baking temperature was it is ensured that after baking of tundish
Temperature control is more than 1100 DEG C；Using box layering oven, coverture and covering slag are toasted, baking temperature is 300
DEG C, baking time 3 hours；Ferroalloy is toasted using alloy baking stove, baking temperature controls at 500 DEG C, during baking
Between 4 hours；Reach the purpose of moisture removal by aforesaid operations, thus effectively reducing external hydrogen source；
(2): rational lf slagging regime, the sufficient low Argon gas agitating of cooperation adds the enough soft blow time it is ensured that pressing from both sides
The abundant floating of debris；Super subnormal ambient created by vd vacuum refining furnace, is de-gassed further and goes to be mingled with process；
Pass through after Converter to add enough aluminium ingots (purity >=99%) to carry out deep deoxidation；Lf refining process adopts high in 4-6
Basicity slag system, the big quantity of slag operation of 1-1.2 ton carries out deoxidation, desulfurization operations；Guarantee to press from both sides by the 40 minutes sufficient soft blow time
The abundant floating of debris；
Vd vacuum refining process passes through to create super subnormal ambient, vacuum 66.5pa, and the vacuum of cooperation 10-15 minute keeps
Time, to reach further degassing and to go the purpose being mingled with；
(3): the cast of casting process whole process protection, low overheat, permanent pulling rate casting, and coordinate first and end electromagnetic agitation, fall
Low strand column crystal rate, improves Center Equiaxial Crystal rate, reduces that strand is loose and segregation with effective；
Casting process safeguard measure: protective casting is carried out using big bag long nozzle and submersed nozzle；In the middle of bilayer
Covering agent and special crystallizer covering slag carry out molten steel covering protection, on the one hand can effectively prevent the secondary oxidation of molten steel, separately
On the one hand the effect of further dross inclusion adsorption can be played.
Casting process controls rational molten steel overheat, is controlled in the range of 15 DEG C, and coordinates permanent pulling rate operation,
Reduce the fluctuation in molten steel face, stablize slab quality.By electromagnetic agitation is coordinated using m-ems and f-ems first and last, reduce segregation
Produce.
(4): steel-making, rolling process adopt high temperature hydrogen to spread slow cooling technology, reduce gas content further；
Root hydrogen diffusion temperature is interval, ensures that strand, stocking enter to cheat slow cooling it is ensured that hydrogen on hydrogen diffusion temperature in time
Fully spread.Strand and become a useful person enter to cheat slow cooling temperature and should control more than 450 DEG C, and when temperature is reduced to 100 DEG C before,
Do not allow to cheat.
Claims (6)
1. engineering machinery 35mnbm zero turriform hairline control method, specifically comprises the following steps that
(1): fully carry out former auxiliary material, the baking of ferroalloy, reduce external hydrogen source；
Tundish is toasted, using the baking time of 6-8 hour, 1000-1200 DEG C of baking temperature is it is ensured that baking of tundish
Temperature control is more than 1100 DEG C afterwards；Using box layering oven, coverture and covering slag are toasted, baking temperature is
200-300 DEG C, baking time 3-4 hour；Ferroalloy is toasted using alloy baking stove, baking temperature controls in 300-
500 DEG C, baking time 4-6 hour；
(2): rational lf slagging regime, the sufficient low Argon gas agitating of cooperation adds the enough soft blow time it is ensured that field trash
Abundant floating；Super subnormal ambient created by vd vacuum refining furnace, is de-gassed further and goes to be mingled with process；
Carry out deep deoxidation by adding the aluminium ingot of purity >=99% after Converter；Lf refining process adopts high alkalinity slag system in 4-6,
The big quantity of slag operation of 1-1.2 ton carries out deoxidation, desulfurization operations；Low Argon gas agitating adds that the soft blow time is 20-40 minute；
Vd vacuum refining process vacuum is 66.5-20pa, and keeps the vacuum retention time of 10-15 minute；
(3): the cast of casting process whole process protection, low overheat, permanent pulling rate casting, and coordinate first and end electromagnetic agitation, reduce casting
Base column crystal rate, improves Center Equiaxial Crystal rate, reduces that strand is loose and segregation with effective；
Casting process safeguard measure: protective casting is carried out using big bag long nozzle and submersed nozzle；Using cladding in the middle of bilayer
Lid agent and crystallizer protecting residue carry out molten steel covering protection；
Casting process controls rational molten steel overheat, is controlled in the range of≤30 DEG C, and coordinates permanent pulling rate operation, leads to
Cross and electromagnetic agitation is coordinated using m-ems and f-ems first and last；
(4): steel-making, rolling process adopt high temperature hydrogen to spread slow cooling technology, reduce gas content further；
Interval according to hydrogen diffusion temperature, ensure entering to cheat slow cooling temperature and should controlling more than 450 DEG C of strand and stocking in time, and
When temperature is reduced to 100 DEG C before, do not allow to cheat.
2. engineering machinery according to claim 1 35mnbm zero turriform hairline control method, its feature is as follows:
In described step (3), casting process controls rational molten steel overheat, is controlled in the range of 15-30 DEG C.
3. engineering machinery according to claim 1 35mnbm zero turriform hairline control method, its feature is as follows:
In described step (4), the entering to cheat slow cooling temperature and should control at 450-560 DEG C of strand and stocking.
4. engineering machinery according to claim 1 35mnbm zero turriform hairline control method, its feature is as follows:
In described step (4), slow cooling to the temperature that enters to cheat of strand and stocking is reduced to 80-100 DEG C and has started to cheat.
5. engineering machinery according to claim 3 35mnbm zero turriform hairline control method, its feature is as follows:
In described step (4), the entering to cheat slow cooling temperature and should control at 500 DEG C of strand and stocking.
6. engineering machinery according to claim 4 35mnbm zero turriform hairline control method, its feature is as follows:
In described step (4), slow cooling to the temperature that enters to cheat of strand and stocking is reduced to 90 DEG C and has started to cheat.
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| CN108998725A (en) * | 2018-07-17 | 2018-12-14 | 石家庄钢铁有限责任公司 | Track link rail 35MnBM steel and preparation method thereof |
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Address after: West Industrial Park 256209 Shandong province Binzhou city Zouping County Patentee after: XIWANG METAL TECHNOLOGY Co.,Ltd. Address before: West Industrial Park 256209 Shandong province Binzhou city Zouping County Patentee before: SHANDONG XIWANG SPECIAL STEEL Co.,Ltd. |
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Denomination of invention: Control method of 35MnBM zero tower hairline for construction machinery Effective date of registration: 20211227 Granted publication date: 20170125 Pledgee: Xiwang Group Finance Co.,Ltd. Pledgor: XIWANG METAL TECHNOLOGY Co.,Ltd. Registration number: Y2021980016144 |
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