CN103952623B - A kind of boracic piston rod steel and production method thereof - Google Patents
A kind of boracic piston rod steel and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title abstract description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 241001062472 Stokellia anisodon Species 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
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- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 229910045601 alloy Inorganic materials 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
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Abstract
A kind of boracic piston rod steel, its component and wt% are: C:0.35 ~ 0.42%, Si:0.15 ~ 0.35%, Mn:0.50 ~ 0.70%, P≤0.035%, S:0.015 ~ 0.035%, B:0.0009 ~ 0.0025%; Production stage: smelt and Argon; In the refining of LF stove; Vacuum-treat in RH vacuum oven; Continuous casting; Strand is heated; Roughing; Finish rolling; Air cooling; Air cooling is to room temperature.Present component is simple, low production cost, and steel processing characteristics is excellent, stable mechanical property, steel surface is highly polished after cutting, and steel hot rolling state property can reach: tensile strength is 550 ~ 610MPa, reduction of area >=30%, the total decarburized layer degree of depth≤0.3mm.
Description
Technical field
The present invention relates to a kind of piston rod steel and production method thereof, belong to a kind of boracic piston rod steel and production method thereof particularly.
Background technology
Piston rod steel is mainly for the manufacture of hydropneumatic, engineering machinery, piston used for automobile shock absorber bar, and the guide pillar of plastics machinery, the roll shaft of wrapping mechanism, the axle center of conveying machinery.General common used material has 35,45 quality carbon steels, 40Cr chromium steel etc.Use 40Cr steel making, its intensity high-wearing feature is good, but is better than quality carbon steel due to this steel hardenability, after modifier treatment, intensity, hardness significantly improve and cause mechanical processing difficulty large, cutter easy to wear, insufficient formability, and cost is high, the 40Cr steel price with producer's same specification is 1.5 times of 45 steel prices; Select 35,45 steel to produce, though its intensity is moderate, because purity of steel, homogeneity of structure are not as good as 40Cr, and it is large to cause quench bend to be out of shape, and follow-up alignment difficulty of processing is large, roller part easy to wear, and the process-cycle is long, and production efficiency is low, complex manufacturing.
Through retrieval, look into and publish in document, have in the report about piston rod steel: Chinese Patent Application No. CN201210585823 discloses a kind of non-hardened and tempered steel being applied to dozer cylinder piston rod, it is characterized in that being made up of the component of following weight percent, carbon 0.33%, silicon 0.36%, manganese 1.17%, alum 0.1%, sulphur 0.027%, phosphorus≤0.0165%, molybdenum≤0.011%, surplus is iron and a small amount of inevitably impurity, and its existence cannot ensure the deficiency of chemical composition hit rate; Japanese patent application No. JP1991167131A discloses a kind of punching press piston rod steel, comprise following chemical composition: C 0.22-0.32%, Si≤0.15%, Mn≤0.60%, P≤0.020%, S≤0.020%, Ni 3.25-4.20%, Cr 1.25-2.00%, Mo 0.20-0.60%, V≤0.17%, all the other are iron and inevitable impurity; Compare traditional piston rod material SNCM439 and SCM440 and there is better work-ing life and impact property.Russ P application number RU20060133363 discloses the production method that a kind of diameter range is 40-170mm medium carbon steel, is applicable to piston rod series products.Comprise following chemical composition: C 0.38-0.43%; Mn 0.50-0.80%; Si 0.17-0.37%; Cr 0.70-1.00%; S 0.005-0.040%; Mo 0.03-0.06%; V 0.04-0.08%; Al 0.020-0.045%; Ti 0.020-0.045%; B 0.001-0.003%; N 0.005-0.012%; As 0.0001-0.03%; Sn 0.0001-0.02%; Pb 0.0001-0.01%; Zn 0.0001-0.005%; And meet (As+Sn+Pb+5 × Zn)≤0.07 and Ti/48+Al/27-N/14>=0.6 × 10
-3.The chemical composition of Japanese documentation and Russ P document is very complicated, and expensive alloying element is many, and control accuracy requires high, and production difficulty is very large, and production cost is very high.
In prior art, this area does not all add boron.Because think if with the addition of boron, the hardness that can increase steel is unfavorable for mechanical workout, wearing and tearing cutter, can improve the hardening capacity of steel but the steel of hardening capacity fluctuation ratio containing boron is large.What also have thinks, excessive boron can reduce hardening capacity on the contrary, and hot-short phenomenon can be caused to occur.
In this context, research and develop tensile strength 550 ~ 610 MPa, relative reduction in area is not less than 30%, and Decarburized layer is no more than the low-alloy piston rod steel of 0.3mm.And make that production technique is simple, processing characteristics is excellent, intensity is high and the piston rod steel of low production cost.
Boracic piston rod steel of the present invention is the constituent content such as B, S, Mn in conservative control steel, by controlling smelting technology and rolling technology, make in steel, to separate out a certain amount of MnS and BN inclusion, be conducive to improving steel mechanical workout and cutting ability, friction can be alleviated during the manufacturing, improve cutter life, there is stable mechanical property simultaneously, cut rear steel surface smooth finish advantages of higher.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of tensile strength 550 ~ 610 MPa, relative reduction in area is not less than 30%, Decarburized layer is no more than 0.3mm, and production technique is simple, easily processes, good moldability, the boracic piston rod steel that processing rear surface is highly polished and production method thereof.
The application to achieve these goals, its result is conducted in-depth research on the rise impact or the alloying element of keying action and technique of the object realizing the application, through a large number of experiments show that, the boron of 0.0009 ~ 0.0025% is added in this steel grade, not only can not increase the hardness of steel, also the hot-short phenomenon of steel can not be caused to occur, make on the contrary in steel, to separate out a certain amount of BN inclusion, be conducive to improving cutting rolled steel performance, and hardening capacity improves, make it after thermal treatment to form one deck cold working hardening layer at material surface, and the strength of materials and surface abrasion resistance can be improved, avoid the burn because causing during machining.RH vacuum-treat measure is mainly taken at process aspect.
Realize the measure of above-mentioned purpose:
A kind of boracic piston rod steel, its component and weight percent content are: C:0.35 ~ 0.42%, Si:0.15 ~ 0.35%, Mn:0.50 ~ 0.70%, P≤0.035%, S:0.015 ~ 0.035%, B:0.0009 ~ 0.0025%, all the other are Fe and inevitable impurity element.
Produce a kind of method of boracic piston rod steel, its step:
1) smelt and in argon station Argon, argon blowing time is not less than 2 minutes;
2) in LF stove, carry out refining, and the basicity controlling slag is 0.7 ~ 3.0; Blowing argon gas stirs, and the time was at 20 ~ 40 minutes;
3) in RH vacuum oven, carry out vacuum-treat, control vacuum tightness and be no more than 100Pa, 10 ~ 35 minutes treatment times;
4) carry out continuous casting, and control casting speed at 1.0 ~ 1.5 ms/min;
5) to strand heating, heating and temperature control at 1100 ~ 1230 DEG C, and is incubated 40 ~ 100 minutes at this temperature, and time inside furnace is 2 ~ 4 hours;
6) carry out roughing, control its start rolling temperature at 1000 ~ 1100 DEG C;
7) carry out finish rolling, control its start rolling temperature 950 ~ 1050 DEG C, finishing temperature is at 1000 ~ 1100 DEG C, and accumulative deflection is 10 ~ 50%;
8) carry out air cooling, be cooled to 450 ~ 700 DEG C according to speed of cooling 5 ~ 20 DEG C/sec, and be incubated 50 ~ 100 minutes at this temperature;
9) air cooling is to room temperature.
The effect of each element and master operation in the present invention
C:C determines the principal element of hardness of steel, along with the increase steel of C content intensity, hardness increases and plasticity and toughness decline, so C content should not be too high, but need to bear higher working strength as piston rod.Therefore, C content is controlled 0.35 ~ 0.42%.
Si:Si is mainly present in ferrite or austenite with the form of sosoloid in steel, can improve the intensity of steel, be also the deoxidant element of steel-making, but content is unsuitable too high, in order to avoid reduce the toughness of steel.Therefore control 0.15 ~ 0.35%
Mn:Mn is good reductor and sweetening agent, is mainly dissolved in ferrite the intensity improving steel, can improve the processing characteristics of steel.But content is unsuitable too high, in order to avoid make the coarse grains of steel.Therefore control 0.50 ~ 0.70%
P:P is harmful element in steel, and the plasticity reducing steel increases cold shortness simultaneously, thus better low as far as possible, considers steel-making working control situation, therefore controls≤0.035%
S:S is strong crack sensitivity element, thus better low as far as possible, but in order to improve the machinability of steel, being formed and keep certain MnS inclusion at steel grade.Therefore control 0.015 ~ 0.035%
B:B promotes Austenite Grain Growth element, and content will cause the hot-short phenomenon of steel more than 0.007%, but is that acquisition strip or granular BN are mingled with, thus improves the machinability of steel, and meanwhile, certain B content can improve the hardening capacity of steel.In addition, suitable B can reduce drawing, the alignment processing that carbon steel As rolled tensile strength is convenient to steel.Therefore content controls 0.0009 ~ 0.0025%.
Carry out the vacuum treated technology of RH after the present invention proposes refining, and control vacuum tightness≤100Pa, treatment time 10 ~ 35min, its object is exactly to reduce steel grade H, O, N gas content, improves purity of steel.950 ~ 1050 DEG C of finish rolling after roughing terminates, finishing stands adds up deformation quantity 10 ~ 50%, the rolling technology of high temperature small deformation amount, and steel matrix resistance to deformation is reduced, MnS and BN inclusion deformability reduce make to roll after be mingled with form and controlled, be conducive to cutting rolled steel performance and improve.Be cooled to be incubated 50 ~ 100min between 450 ~ 700 DEG C with 5 ~ 20 DEG C/s rate of cooling after rolling, make nano-scale particle (ε-Cu) Precipitation, the effect serving inclusion stress raiser improves cuts chip-breaking performance, also alleviates friction and improves cutter life, thus improve the cutting ability of steel.After being incubated, make to naturally cool to room temperature in steel air.
Compared with prior art, composition is simple, low production cost in the present invention, steel processing characteristics is excellent, stable mechanical property, steel surface is highly polished after cutting, and steel hot rolling state property can reach: tensile strength is 550 ~ 610 MPa, reduction of area >=30%, the total decarburized layer degree of depth≤0.3mm.
Embodiment
Below the present invention is described in detail:
Table 1 is the component value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
Its step:
1) smelt and in argon station Argon, argon blowing time is not less than 2 minutes;
2) in LF stove, carry out refining, and the basicity controlling slag is 0.7 ~ 3.0; Blowing argon gas stirs, and the time was at 20 ~ 40 minutes;
3) in RH vacuum oven, carry out vacuum-treat, control vacuum tightness and be no more than 100Pa, 10 ~ 35 minutes treatment times;
4) carry out continuous casting, and control casting speed at 1.0 ~ 1.5 ms/min;
5) to strand heating, heating and temperature control at 1100 ~ 1230 DEG C, and is incubated 40 ~ 100 minutes at this temperature, and time inside furnace is 2 ~ 4 hours;
6) carry out roughing, control its start rolling temperature at 1000 ~ 1100 DEG C;
7) carry out finish rolling, control its start rolling temperature 950 ~ 1050 DEG C, finishing temperature is at 1000 ~ 1100 DEG C, and accumulative deflection is 10 ~ 50%;
8) carry out air cooling, be cooled to 450 ~ 700 DEG C according to speed of cooling 5 ~ 20 DEG C/sec, and be incubated 50 ~ 100 minutes at this temperature;
9) air cooling is to room temperature.
The component value list of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Table 3 various embodiments of the present invention and the list of comparative example Performance Detection situation
As can be seen from Table 3, the boracic piston rod steel mechanical property that the present invention is manufactured by the present invention is stablized, and the tool for cutting machining life-span significantly improves, and chip-breaking performance is excellent, steel surface smooth finish high after cutting.Production method of the present invention is implemented under conventional During Hot Bar Rolling technical process, and production cost is low, produces and uses in steel process simple to operate, controls stable, with low cost.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. produce a kind of method of boracic piston rod steel, its step:
1) smelt and in argon station Argon, argon blowing time is not less than 2 minutes;
2) in LF stove, carry out refining, and the basicity controlling slag is 0.7 ~ 3.0; Blowing argon gas stirs, and the time was at 20 ~ 40 minutes;
3) in RH vacuum oven, carry out vacuum-treat, control vacuum tightness and be no more than 100Pa, 10 ~ 35 minutes treatment times;
4) carry out continuous casting, and control casting speed at 1.0 ~ 1.5 ms/min; The component of strand and weight percent content are: C:0.35 ~ 0.42%, Si:0.15 ~ 0.35%, Mn:0.50 ~ 0.70%, P≤0.035%, S:0.015 ~ 0.035%, B:0.0009 ~ 0.0025%, and all the other are Fe and inevitable impurity element;
5) to strand heating, heating and temperature control at 1100 ~ 1230 DEG C, and is incubated 40 ~ 100 minutes at this temperature, and time inside furnace is 2 ~ 4 hours;
6) carry out roughing, control its start rolling temperature at 1000 ~ 1100 DEG C;
7) carry out finish rolling, control its start rolling temperature 950 ~ 1050 DEG C, finishing temperature is at 1000 ~ 1100 DEG C, and accumulative deflection is 10 ~ 50%;
8) carry out air cooling, be cooled to 450 ~ 700 DEG C according to speed of cooling 5 ~ 20 DEG C/sec, and be incubated 50 ~ 100 minutes at this temperature;
9) air cooling is to room temperature.
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| CN105821348A (en) * | 2015-01-06 | 2016-08-03 | 宝钢特钢有限公司 | Ball stud steel of automobile steering system and manufacturing method thereof |
| CN104630618B (en) * | 2015-01-19 | 2017-04-12 | 宁波钢铁有限公司 | Steel 55MnB for domestic gardening tools and preparation method thereof |
| CN107058880B (en) * | 2017-03-28 | 2018-10-23 | 邢台钢铁有限责任公司 | A kind of automobile daming piston bar steel and its production method |
| CN107227393B (en) * | 2017-06-19 | 2020-04-07 | 武汉钢铁有限公司 | Production method for reducing fatigue crack propagation rate of bainite steel rail |
| CN113528937A (en) * | 2021-06-09 | 2021-10-22 | 南京钢铁股份有限公司 | Economical steel for hardware tools and manufacturing method thereof |
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| JP2003253336A (en) * | 2002-03-06 | 2003-09-10 | Jfe Steel Kk | Process for manufacturing grain-oriented magnetic steel sheet having excellent surface quality and high magnetic flux density |
| CN101792882A (en) * | 2010-01-08 | 2010-08-04 | 唐山国丰钢铁有限公司 | Production method of boracic hot-rolled coil plates with low yield ratio |
| CN103469056A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-tensile-to-yield-ratio common hot rolled steel plate and making method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003253336A (en) * | 2002-03-06 | 2003-09-10 | Jfe Steel Kk | Process for manufacturing grain-oriented magnetic steel sheet having excellent surface quality and high magnetic flux density |
| CN101792882A (en) * | 2010-01-08 | 2010-08-04 | 唐山国丰钢铁有限公司 | Production method of boracic hot-rolled coil plates with low yield ratio |
| CN103469056A (en) * | 2013-08-15 | 2013-12-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-tensile-to-yield-ratio common hot rolled steel plate and making method thereof |
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