CN104195282A - 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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- CN104195282A CN104195282A CN201410405428.4A CN201410405428A CN104195282A CN 104195282 A CN104195282 A CN 104195282A CN 201410405428 A CN201410405428 A CN 201410405428A CN 104195282 A CN104195282 A CN 104195282A
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- hairline
- turriform
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 239000001257 hydrogen Substances 0.000 claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 24
- 238000010583 slow cooling Methods 0.000 claims abstract description 21
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 13
- 238000009628 steelmaking Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 150000002431 hydrogen Chemical class 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005204 segregation Methods 0.000 claims description 10
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 7
- 238000007667 floating Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
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, be specially engineering machinery 35MnBM zero turriform hairline control method.
Background technology
Turriform hairline is mainly that A in steel, C type impurity and loose, gas content (are mainly H
2produce hydrogen embrittlement) etc. in the machining deformation process of steel, be extended along forging rolling direction due to.
Steel for engineering machinery requires very large ratio of forging reduction, reaches as high as 1/4 forging and stamping, therefore required steel has been proposed to very strict requirement, and how many turriform hairlines directly affects the heat forged performance of steel.Hairline is seriously endangering the mechanical property of steel, particularly fatigue strength etc., and quantity, size and distribution for the manufacture of the steel of important parts to hairline have strict restriction.Therefore, for the origin cause of formation of turriform hairline and controlled by Optimization Technology, become to eliminate turriform hairline the emphasis of studying in industry.
Summary of the invention
The object of the invention is to solve the internal soundness of engineering type 35MnBM, to reach the object of zero turriform hairline.Steelmaking process adopts the ultrapure cleanliness control techniques of molten steel, rolling process adopts large compression ratio and high temperature hydrogen diffusion slow cooling technology, make steel inclusion and gas content reach the object of expection, thereby realized zero turriform hairline of finished product, guaranteed the processing characteristics of product.
Technical scheme of the present invention is:
35MnBM zero turriform hairline control method for engineering machinery, concrete steps are as follows:
(1): fully carry out the baking of former auxiliary material, iron alloy, reduce external hydrogen source;
Tundish is toasted, adopt the baking time of 6-8 hour, storing temperature 1000-1200 DEG C, guarantees after baking of tundish that temperature is controlled at and is greater than 1100 DEG C; Adopt box layering roaster to toast insulating covering agent and covering slag, storing temperature is 200-300 DEG C, baking time 3-4 hour; Adopt alloy baking stove to toast for iron alloy, storing temperature is controlled at 300-500 DEG C, baking time 4-6 hour; Reach the object of removing moisture by aforesaid operations, thereby effectively reduce external hydrogen source;
(2): reasonably LF slagging regime, coordinate sufficient low blowing argon gas to stir and add the enough soft blow time, guarantee the abundant floating of inclusion; VD vacuum refining furnace is created super subnormal ambient, further carry out degassed with go to be mingled with processing;
After Converter, carry out deep deoxidation by the aluminium ingot that adds purity >=99%; LF refining process adopts high alkalinity slag system in 4-6, and deoxidation, desulfurization operations are carried out in the large quantity of slag operation of 1-1.2 ton; Low blowing argon gas stirs and adds soft blow time >=20 minute;
VD vacuum refinement process vacuum tightness≤66.5Pa, and keep vacuum hold-time of 10-15 minute;
(3): the cast of casting process whole process protection, low overheat, the casting of permanent pulling rate, and coordinate first and end induction stirring, and reduce strand column crystal rate, improve center equiaxial crystal ratio, loosen and segregation effectively to reduce strand;
Casting process sfgd.: adopt large bag long nozzle and submerged nozzle to carry out protective casting; Adopt double-layer tundish covering agent and special crystallizer covering slag to carry out molten steel covering protection, can effectively prevent on the one hand the secondary oxidation of molten steel, can play on the other hand the effect of further dross inclusion adsorption;
The rational molten steel overheat of casting process control, in the be controlled at≤scope of 30 DEG C, and coordinates permanent pulling rate operation, reduces the fluctuation of molten steel face, stablizes slab quality; By adopting M-EMS and F-EMS first and last to coordinate induction stirring, reduce the generation of segregation;
(4): steel-making, rolling process adopt high temperature hydrogen diffusion slow cooling technology, further reduce gas content;
According to hydrogen diffusion temperature interval, ensure that in time strand, stocking enter to cheat slow cooling on hydrogen diffusion temperature, guarantee the abundant diffusion of hydrogen, the entering to cheat slow cooling temperature and should be controlled at more than 450 DEG C of strand and stocking, and when temperature was reduced to before 100 DEG C, do not allow hole.
Feature of the present invention also has:
In described step (2), the soft blow time is 20-40 minute, guarantees the abundant floating of inclusion.
In described step (2), VD vacuum refinement process vacuum tightness is 66.5-20Pa, and keeps the vacuum hold-time of 10-15 minute, reaches the further degassed object with going to be mingled with.
In described step (3), the rational molten steel overheat of casting process control, is controlled in the scope of 15-30 DEG C.
In described step (4), the entering to cheat slow cooling temperature and should be controlled at 450-560 DEG C of strand and stocking; As preferably, the entering to cheat slow cooling temperature and should be controlled at 500 DEG C of strand 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 hole, and 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.
Beneficial effect of the present invention is:
(1) product through mountain push away, Jilong, Jinan forges on probationly, and through oversampling magnetic-particle inspection, product flawless exists, product qualification rate reaching 100%.
(2) product, through national steel products Quality Supervision and Inspection Center, the inspection of Shan Tui clinical laboratory, all exists without turriform hairline.
Following is that the part of national steel products Quality Supervision and Inspection Center detects data
Trade mark 35MnBM, specification (diameter) 80mm.
1. chemical composition is in table 1.
Table 1
2. macrostructure
0.5 grade of General Loosen, 1.0 grades of center porosities, 0.5 grade of pattern segregation, 0 grade of general spot segregation, 0 grade of edge spot segregation.
3. turriform hairline
3 ladders are for finding hairline.
4. non-metallic inclusion (level)
Category-A: be carefully 0.5
Be slightly 0
Category-B: be carefully 1.0
Be slightly 0
C class: be carefully 0
Be slightly 0
D class: be carefully 1.0
Be slightly 0
DS class: 0.
5. grain fineness number (level) 7.0.
6. decarburized layer deepness 0.628mm.
7. hardening capacity (HRC) J1.5:55.5; J13:49.8; J19:39.6.Hardening capacity heat treating regime requires: 900 DEG C of normalizings; End quenching temperature: 870 DEG C.
Maximum nitride size (μ m) 11.17.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in detail.
embodiment 1
35MnBM zero turriform hairline control method for engineering machinery, concrete steps are as follows:
(1): fully carry out the baking of former auxiliary material, iron alloy, reduce external hydrogen source;
Tundish is toasted, adopt the baking time of 6 hours, 1200 DEG C of storing temperatures, guarantee after baking of tundish that temperature is controlled at and are greater than 1100 DEG C; Adopt box layering roaster to toast insulating covering agent and covering slag, storing temperature is 200 DEG C, baking time 4 hours; Adopt alloy baking stove to toast for iron alloy, storing temperature is controlled at 300 DEG C, baking time 6 hours; Reach the object of removing moisture by aforesaid operations, thereby effectively reduce external hydrogen source;
(2): reasonably LF slagging regime, coordinate sufficient low blowing argon gas to stir and add the enough soft blow time, guarantee the abundant floating of inclusion; VD vacuum refining furnace is created super subnormal ambient, further carry out degassed with go to be mingled with processing;
After Converter by adding enough aluminium ingots (purity >=99%) to carry out deep deoxidation; LF refining process adopts high alkalinity slag system in 4-6, and deoxidation, desulfurization operations are carried out in the large quantity of slag operation of 1-1.2 ton; Guaranteed the abundant floating of inclusion by 20 minutes sufficient soft blow time;
VD vacuum refinement process surpasses subnormal ambient by creation, and vacuum tightness 20Pa coordinates the vacuum hold-time of 10-15 minute, reaches the further degassed object with going to be mingled with;
(3): casting process whole process protection is poured into a mould, low overheat, the casting of permanent pulling rate, and coordinate first and end induction stirring, and reduce strand column crystal rate, improve center equiaxial crystal ratio, loosen and segregation effectively to reduce thin strand;
Casting process sfgd.: adopt large bag long nozzle and submerged nozzle to carry out protective casting; Adopt double-layer tundish covering agent and special crystallizer covering slag to carry out molten steel covering protection, can effectively prevent on the one hand the secondary oxidation of molten steel, can play on the other hand the effect of further dross inclusion adsorption.
The rational molten steel overheat of casting process control, is controlled in the scope of 30 DEG C, and coordinates permanent pulling rate operation, reduces the fluctuation of molten steel face, stablizes slab quality.By adopting M-EMS and F-EMS first and last to coordinate induction stirring, reduce the generation of segregation.
(4): steel-making, rolling process adopt high temperature hydrogen diffusion slow cooling technology, further reduce gas content;
Root hydrogen diffusion temperature interval, ensures that strand, stocking enter to cheat slow cooling on hydrogen diffusion temperature, guarantee the abundant diffusion of hydrogen in time.Strand and become a useful person enter to cheat slow cooling temperature and should be controlled at 560 DEG C, and be reduced to before 80 DEG C when temperature, do not allowed to cheat.
embodiment 2
35MnBM zero turriform hairline control method for engineering machinery, concrete steps are as follows:
(1): fully carry out the baking of former auxiliary material, iron alloy, reduce external hydrogen source;
Tundish is toasted, adopt the baking time of 8 hours, 1100 DEG C of storing temperatures, guarantee after baking of tundish that temperature is controlled at and are greater than 1100 DEG C; Adopt box layering roaster to toast insulating covering agent and covering slag, storing temperature is 300 DEG C, baking time 3 hours; Adopt alloy baking stove to toast for iron alloy, storing temperature is controlled at 500 DEG C, baking time 4 hours; Reach the object of removing moisture by aforesaid operations, thereby effectively reduce external hydrogen source;
(2): reasonably LF slagging regime, coordinate sufficient low blowing argon gas to stir and add the enough soft blow time, guarantee the abundant floating of inclusion; VD vacuum refining furnace is created super subnormal ambient, further carry out degassed with go to be mingled with processing;
After Converter by adding enough aluminium ingots (purity >=99%) to carry out deep deoxidation; LF refining process adopts high alkalinity slag system in 4-6, and deoxidation, desulfurization operations are carried out in the large quantity of slag operation of 1-1.2 ton; Guaranteed the abundant floating of inclusion by 40 minutes sufficient soft blow time;
VD vacuum refinement process surpasses subnormal ambient by creation, and vacuum tightness 66.5Pa coordinates the vacuum hold-time of 10-15 minute, reaches the further degassed object with going to be mingled with;
(3): the cast of casting process whole process protection, low overheat, the casting of permanent pulling rate, and coordinate first and end induction stirring, and reduce strand column crystal rate, improve center equiaxial crystal ratio, loosen and segregation effectively to reduce strand;
Casting process sfgd.: adopt large bag long nozzle and submerged nozzle to carry out protective casting; Adopt double-layer tundish covering agent and special crystallizer covering slag to carry out molten steel covering protection, can effectively prevent on the one hand the secondary oxidation of molten steel, can play on the other hand the effect of further dross inclusion adsorption.
The rational molten steel overheat of casting process control, is controlled in the scope of 15 DEG C, and coordinates permanent pulling rate operation, reduces the fluctuation of molten steel face, stablizes slab quality.By adopting M-EMS and F-EMS first and last to coordinate induction stirring, reduce the generation of segregation.
(4): steel-making, rolling process adopt high temperature hydrogen diffusion slow cooling technology, further reduce gas content;
Root hydrogen diffusion temperature interval, ensures that strand, stocking enter to cheat slow cooling on hydrogen diffusion temperature, guarantee the abundant diffusion of hydrogen in time.Strand and become a useful person enter to cheat slow cooling temperature and should be controlled at more than 450 DEG C, and be reduced to before 100 DEG C when temperature, do not allowed to cheat.
Claims (8)
1. 35MnBM zero turriform hairline control method for engineering machinery, concrete steps are as follows:
(1): fully carry out the baking of former auxiliary material, iron alloy, reduce external hydrogen source;
Tundish is toasted, adopt the baking time of 6-8 hour, storing temperature 1000-1200 DEG C, guarantees after baking of tundish that temperature is controlled at and is greater than 1100 DEG C; Adopt box layering roaster to toast insulating covering agent and covering slag, storing temperature is 200-300 DEG C, baking time 3-4 hour; Adopt alloy baking stove to toast for iron alloy, storing temperature is controlled at 300-500 DEG C, baking time 4-6 hour;
(2): reasonably LF slagging regime, coordinate sufficient low blowing argon gas to stir and add the enough soft blow time, guarantee the abundant floating of inclusion; VD vacuum refining furnace is created super subnormal ambient, further carry out degassed with go to be mingled with processing;
After Converter, carry out deep deoxidation by the aluminium ingot that adds purity >=99%; LF refining process adopts high alkalinity slag system in 4-6, and deoxidation, desulfurization operations are carried out in the large quantity of slag operation of 1-1.2 ton; Low blowing argon gas stirs and adds soft blow time >=20 minute;
VD vacuum refinement process vacuum tightness≤66.5Pa, and keep vacuum hold-time of 10-15 minute;
(3): the cast of casting process whole process protection, low overheat, the casting of permanent pulling rate, and coordinate first and end induction stirring, and reduce strand column crystal rate, improve center equiaxial crystal ratio, loosen and segregation effectively to reduce strand;
Casting process sfgd.: adopt large bag long nozzle and submerged nozzle to carry out protective casting; Adopt double-layer tundish covering agent and special crystallizer covering slag to carry out molten steel covering protection;
The rational molten steel overheat of casting process control, in the be controlled at≤scope of 30 DEG C, and coordinates permanent pulling rate operation, by adopting M-EMS and F-EMS first and last to coordinate induction stirring;
(4): steel-making, rolling process adopt high temperature hydrogen diffusion slow cooling technology, further reduce gas content;
According to hydrogen diffusion temperature interval, ensure in time entering to cheat slow cooling temperature and should being controlled at more than 450 DEG C of strand and stocking, and be reduced to before 100 DEG C when temperature, do not allow to cheat.
2. 35MnBM zero turriform hairline control method for engineering machinery according to claim 1, its feature is as follows:
In described step (2), the soft blow time is 20-40 minute.
3. 35MnBM zero turriform hairline control method for engineering machinery according to claim 1, its feature is as follows:
In described step (2), VD vacuum refinement process vacuum tightness is 66.5-20Pa, and keeps the vacuum hold-time of 10-15 minute.
4. 35MnBM zero turriform hairline control method for engineering machinery according to claim 1, its feature is as follows:
In described step (3), the rational molten steel overheat of casting process control, is controlled in the scope of 15-30 DEG C.
5. 35MnBM zero turriform hairline control method for engineering machinery according to claim 1, its feature is as follows:
In described step (4), the entering to cheat slow cooling temperature and should be controlled at 450-560 DEG C of strand and stocking.
6. 35MnBM zero turriform hairline control method for engineering machinery according to claim 1, its feature is as follows:
In described step (4), strand and stocking enter to cheat slow cooling to temperature be reduced to 80-100 DEG C started hole.
7. 35MnBM zero turriform hairline control method for engineering machinery according to claim 5, its feature is as follows:
In described step (4), the entering to cheat slow cooling temperature and should be controlled at 500 DEG C of strand and stocking.
8. 35MnBM zero turriform hairline control method for engineering machinery according to claim 6, its feature is as follows:
In described step (4), strand and stocking enter to cheat slow cooling to temperature be reduced to 90 DEG C started hole.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177442A (en) * | 2015-08-19 | 2015-12-23 | 山东西王特钢有限公司 | Low-alloy high-strength steel billet and manufacturing method thereof |
| 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 |
| CN109082500A (en) * | 2018-08-28 | 2018-12-25 | 包头钢铁（集团）有限责任公司 | The control method of rail hydrogen content |
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| CN101654761A (en) * | 2009-05-25 | 2010-02-24 | 莱芜钢铁股份有限公司 | Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof |
| CN103952640A (en) * | 2014-04-26 | 2014-07-30 | 广东韶钢松山股份有限公司 | 35MnB steel and preparation method thereof |
-
2014
- 2014-08-18 CN CN201410405428.4A patent/CN104195282B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101654761A (en) * | 2009-05-25 | 2010-02-24 | 莱芜钢铁股份有限公司 | Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof |
| CN103952640A (en) * | 2014-04-26 | 2014-07-30 | 广东韶钢松山股份有限公司 | 35MnB steel and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177442A (en) * | 2015-08-19 | 2015-12-23 | 山东西王特钢有限公司 | Low-alloy high-strength steel billet and manufacturing method thereof |
| 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 |
| CN109082500A (en) * | 2018-08-28 | 2018-12-25 | 包头钢铁（集团）有限责任公司 | The control method of rail hydrogen content |
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