CN102517522A - Steel for hydraulic piece and manufacturing method for steel - Google Patents
Steel for hydraulic piece and manufacturing method for steel Download PDFInfo
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Abstract
The invention provides steel for a hydraulic piece and a preparation method for the steel. The preparation method comprises the following steps of: 1, smelting, namely generating foaming slag in the electric furnace smelting overall process and controlling terminal points [C] and [P], wherein the tapping temperature of molten steel is 1,620 to 1,680 DEG C; the adding amount of steel core aluminum for preliminary dexidation in a steel ladle is 0.5 to 2.0 kilograms per ton of steel; and alloying is performed in the steel ladle when the tapping amount of the molten steel is 1/4; 2, performing external low-frequency (LF) furnace refining, wherein the refining slag alkalinity is 3.0 to 3.5; the white slag retention time is more than 20 minutes; in a sulfur feeding line, the vacuum degree is less than 67 Pa and the retention time is more than 12 minutes; and after vacuum distillation (VD), the argon blowing time is 10 to 15 minutes; 3, pouring, wherein casting blanks are poured through continuous casting; during continuous casting, magnetic stirring is adopted, the temperature of a tundish is controlled to be between 1,520 and 1,535 DEG C, and the casting speed is 0.6 to 0.8 m/min; and the soaking temperature of a heating furnace is controlled to be between 1,140 and 1,240 DEG C, the heating time is 2 to 3 hours, the initial rolling temperature is between 1,080 and 1,130 DEG C, and the final rolling temperature is between 850 and 950 DEG C; and slowly cooling, wherein the slowly cooling speed is 1.0 to 1.5 DEG C/min. The steel for the hydraulic piece comprises the following chemical components in percentage by mass: 0.22 to 0.32 percent of C, 0.17 to 0.37 percent of Si, 0.80 to 1.30 percent of Mn, 1.0 to 1.40 percent of Cr, 0.003 to 0.015 percent of Mo, less than or equal to 0.25 percent of Ni, less than or equal to 0.030 percent of P, 0.015 to 0.060 percent of S, 0.005 to 0.070 percent of Al, 0.04 to 0.15 percent of Ti and the balance of Fe and inevitable impurities.
Description
Technical field
The present invention relates to the steel alloy technical field, more particularly, relate to a kind of hydraulic part with steel and method of manufacture thereof.
Background technology
Hydraulic part comprises hydro-cylinder, hydro-pump, hydraulicvalve three major types.Hydro-pump carries out energy transformation through the stator and the rotor of oil motor.Stator and rotor are strict to surface smoothness, and the broaching processibility is very big to its influence.The hardness of stator is when 180HB～210HB, and the broaching performance is splendid, and broaching back surface quality is also very good.Hardness is low excessively, and broaching occurs the heap bits often and causes the broaching tool fracture.Hardness is too high, and cutting force will increase during broaching, and broaching tool overwork for a long time can cause repeated stress failure.
One Chinese patent application CN101161845A discloses a kind of synthetic cast iron that is used for hydraulic part production and preparation method thereof; The percentage composition of wherein contained main chemical compositions is: C:3.0-3.3%, Si:1.8-2.0%, Mn:0.4-0.7%, Cr:0-0.3%, Cu:0-0.5%, surplus is Fe and impurity.One Chinese patent application CN1847412A discloses the annealing process of cold-extruded with the 20CrMnTi steel, is specifically related to the annealing heat treatment process of a kind of cold-extruded with the 20CrMnTi steel.
In the disclosed synthetic cast iron of above-mentioned patented claim CN101161845A, carbon content is higher, occurs the hydraulic part poor in processability easily, and dense structure's degree is low, not shortcoming such as anti-high oil pressure.The disclosed annealing heat treatment process of patented claim CN1847412A has increased the operation of making hydraulic part, has caused the increase of cost, and technology is loaded down with trivial details higher with cost.
Therefore, should adopt more suitable material to satisfy broaching processibility, enhancing dense structure degree, raising surface smoothness and the Nai Gao oil pressure property of hydraulic part, will simplify production technique simultaneously.
Summary of the invention
The present invention provides a kind of hydraulic part that composition of steel has been carried out optimization design through the method for microalloying with steel and method of manufacture thereof.
According to an aspect of the present invention, the preparation method of a kind of hydraulic part with steel is provided, said method comprises smelting, LF external refining, casting, rolling, slow cooling operation; Wherein, 1) in smelting procedure, electrosmelting is converted hot metal charging; The operation of whole process making foamed slag, control terminal point [C], [P], the tapping temperature 1620-1680 of molten steel ℃; Preliminary dexidation adds steel core aluminium amount 0.5～2.0kg/t steel in the ladle, and the molten steel tap reaches at 1/4 o'clock, carries out the ladle interalloyization; 2) in LF external refining operation, refining slag basicity is 3.0-3.5, and the white slag hold-time was fed the sulphur line greater than 20 minutes, and vacuum tightness is less than 67Pa, and the hold-time, the soft blow argon time was 10-15 minute behind the VD greater than 12 minutes; 3) in the casting operation, adopt the continuous casting strand, adopt induction stirring in the continuous casting, the control tundish temperature is 1520-1535 ℃, pulling rate 0.6～0.8m/min; 4) in rolling process, 1140-1240 ℃ of control process furnace soaking temperature, 2-3 hour heat-up time, start rolling temperature 1080-1130 ℃, finishing temperature 850-950 ℃; 5) slow cooling; Slow cooling speed is at 1.0-1.5 ℃/min; Wherein, The hydraulic part that makes comprises with the chemical ingredients of steel by mass percentage: 0.22-0.32%, Si:0.17-0.37%, Mn:0.80-1.30%, Cr:1.0-1.40%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.015～0.060%, Al:0.005-0.070%, Ti:0.04-0.15%, all the other are Fe and unavoidable impurities.
Preferably, in the step 1) smelting procedure, control terminal point [C] is 0.15～0.20wt%, [P]≤0.015wt%, when carrying out the ladle alloying, adds Gao Meng, middle chromium, molybdenum-iron, silicomanganese, and wherein, C, Si, Mn, Cr are by the control of specification lower limit add-on.
Preferably, in step 2) in the LF external refining operation, add Gao Meng, Gao Ge, ferrosilicon, molybdenum-iron, aluminum steel, titanium wire etc. according to analytical results, the adjustment component content.More preferably, 2) in LF external refining operation, the add-on of feeding sulphur line and sulphur line before the VD is for being 0.28kg/t～0.67kg/t steel.
Preferably, in step 3) casting operation, adopt the low overheat casting.
Preferably, in step 4) slow cooling operation, adopt stacking slow cooling.
According to a further aspect in the invention; Also provide a kind of hydraulic part to use steel; Wherein, Said hydraulic part comprises 0.22-0.32%, Si:0.17-0.37%, Mn:0.80-1.30%, Cr:1.0-1.40%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.015～0.060%, Al:0.005-0.070%, Ti:0.04-0.15% by mass percentage with the chemical ingredients of steel, and all the other are Fe and unavoidable impurities.
According to embodiments of the invention; Preferably; Said hydraulic part comprises C:0.22-0.31%, Si:0.17-0.37%, Mn:0.80-1.20%, Cr:1.0-1.30%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.020～0.060%, Al:0.005-0.070%, Ti:0.04-0.10% by mass percentage with the chemical ingredients of steel, and all the other are Fe and unavoidable impurities.
Embodiment
To the hydraulic part user to the broaching of material and Drilling Operations property require increasingly high, and the problem that exists of current material, the present invention provides a kind of engineering hydraulic part to use steel.
Specifically, through adjustment C content, reduce the hardness of material; According to the method for microalloying, come crystal grain thinning, the tissue of optimizing material and the hardening capacity of stabilized steel through adding an amount of alloying element Mn, Ti, Al; Add an amount of S element, improve the broaching performance, improve surface quality; Add the Mo element, improved the wear resistance of material.
In addition, the present invention also provides the method for manufacture of this steel, and the oil motor stator that utilizes steel produced according to the invention to make has even hardness, broaching good processability, characteristics such as the dense structure degree is high, and surface smoothness is high, hardening capacity is stable.
Hydraulic part according to the embodiment of the invention uses the chemical ingredients of steel to be C:0.22-0.32%, Si:0.17-0.37%, Mn:0.80-1.30%, Cr:1.0-1.40%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.015～0.060%, Al:0.005-0.070%, Ti:0.04-0.15% by mass percentage, and all the other are Fe and unavoidable impurities.
Be the composition design according to the hydraulic part of the embodiment of the invention with one of characteristics of steel, will describe in detail below according to the effect of the hydraulic part of the embodiment of the invention with each component in the steel.
1) reduce C content, the scope of C content is designed to hardness that 0.22-0.32wt% reduces material to be fit to processing, when C content was less than 0.22wt%, the strength of materials will reduce, and can influence the use of hydraulic part; When C content during greater than 0.32wt%, material hardness will increase, and influences surface smoothness.
2) adopt Mn, Ti, the multi-element alloyed composition design of Al; The content of Mn, Ti, Al is designed to Mn:0.80-1.30wt%, Ti:0.04-0.15wt%, Al:0.005-0.070wt%; Through above-mentioned design, the Al refinement tissue of steel, Mn, Ti have stablized the hardening capacity of steel.
3) add the Mo element, Mo content has been designed to Mo:0.003～0.015wt%, improved the wear resistance of material.Add the less DeGrain of Mo element, can significantly improve hardening capacity more at most, cause cementation zone blocked up.
4) add an amount of S element, S content is designed to S:0.020～0.075wt%, improved the broaching performance, improved surface quality.Add the less DeGrain of S element, can influence the casting quality more at most.
On above-mentioned optimization design basis, consistent for the stable performance that guarantees steel, the composition of preferred steel by mass percent is:
C:0.22-0.31%, Si:0.17-0.37%, Mn:0.80-1.20%, Cr:1.0-1.30%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.020～0.060%, Al:0.005-0.070%, Ti:0.04-0.10%, surplus is Fe and unavoidable impurities.
Two of technical characterstic of the present invention is rational production technique, thereby improves the purity of steel, guarantees the performance quality of steel, has solved the problem of broaching processibility.
To describe in detail below according to the hydraulic part of the embodiment of the invention method of manufacture with steel.
Hydraulic part according to the present invention is with the preparation method of steel, and the chemical composition design of steel requires as stated, and concrete preparation method may further comprise the steps:
(1) smelts
Adopt electrosmelting, the operation of electrosmelting whole process making foamed slag guarantees good oxidizing boil, promotes inclusion and gas come-up; Terminal point [C]: 0.15～0.20wt%, [P]≤0.015wt%, impurity content adheres to specification, the tapping temperature 1620-1680 of molten steel ℃.Preliminary dexidation adds steel core aluminium amount 0.5～2.0kg/t steel in the ladle.The molten steel tap reaches at 1/4 o'clock, carries out the ladle interalloyization, adds Gao Meng, middle chromium, molybdenum-iron, silicomanganese, and wherein, C, Si, Mn, Cr are by the control of specification lower limit add-on.So-called specification lower limit refers to the lower limit of corresponding element content in the steel.
(2) LF external refining
Refining slag basicity is 3.0-3.5, adds Gao Meng, Gao Ge, ferrosilicon, molybdenum-iron, aluminum steel, titanium wire etc. according to analytical results, the adjustment component content.The white slag hold-time was fed the sulphur line greater than 20 minutes, and the add-on of sulphur line is 0.28kg/t～0.67kg/t steel.
In the VD stove, carry out vacuum-treat after the refining, vacuum tightness is less than 67Pa, and the hold-time, the time of soft blow argon was 10-15 minute behind the VD greater than 12 minutes.
(3) casting
Adopt the continuous casting strand, should adopt induction stirring in the continuous casting.1520-1535 ℃ of control tundish temperature, pulling rate 0.6～0.8m/min, to guarantee slab quality, tundish temperature and pulling rate are crossed the low eye that can cause freezing, too high then easy bleed-out.
(4) rolling
1140-1240 ℃ of control process furnace soaking temperature, 2-3 hour heat-up time, start rolling temperature 1080-1130 ℃, finishing temperature 850-950 ℃.Make hot rolled circular steel.
(5) slow cooling
Roll the back and in time collect stacking slow cooling, slow cooling speed so that obtain uniform perlite+ferritic structure, is suitable for the broaching processing of hydraulic part at 1.0-1.5 ℃/min.
The processing condition that do not add qualification among the above preparation method all can be with reference to this area routine techniques.
Below in conjunction with embodiment the present invention is described further.
Embodiment
A kind of engineering hydraulic part is used steel, and its commercial trade mark is 30CrMnTiSH1.Adopt UHP uhp electric arc furnace, LF external refining, VD vacuum degassing treatment tech to smelt continuous casting strand, the rolling explained hereafter steel of becoming a useful person.Embodiment is that the production technique with Φ 90mm specification steel specifies the present invention and how to implement.
Production technique is following:
(1) smelt: adopt electrosmelting, terminal point [C] 0.10～0.15wt%, [P]≤0.015wt%, impurity content adheres to specification, the tapping temperature 1620-1680 of molten steel ℃; Preliminary dexidation adds steel core aluminium amount 0.5～2.0kg/t steel in the ladle.The molten steel tap reaches at 1/4 o'clock, carries out the ladle interalloyization, adds Gao Meng, middle chromium, molybdenum-iron, silicomanganese, and wherein, C, Si, Mn, Cr are by the control of specification lower limit add-on.
(2) LF external refining: refining slag basicity 3.3 adds Gao Meng, Gao Ge, ferrosilicon, molybdenum-iron, aluminum steel, titanium wire etc. according to analytical results, the adjustment component content; 21 minutes white slag hold-times, feed the sulphur line, the add-on of sulphur line is 0.28kg/t～0.67kg/t steel; The refining final vacuum is handled, and vacuum tightness is less than 67Pa, 14 minutes hold-times, 13 minutes soft blow argon time behind the VD.
(3) casting: adopt continuous casting, should adopt induction stirring in the continuous casting.1520-1535 ℃ of control tundish temperature, pulling rate 0.6～0.8m/min, slab quality is good.
(4) rolling: 1140-1240 ℃ of control process furnace soaking temperature, 2-3 hour heat-up time, start rolling temperature 1080-1130 ℃, finishing temperature 850-950 ℃.
(5) slow cooling: roll the back and in time collect stacking slow cooling, slow cooling speed is at 1.2-1.4 ℃/min.
Concrete processing parameter is seen table 1 and table 2.Table 1 is that table 2 is continuous casting molten steel temperature in tundish, casting speed, billet heating temperature, time and rolling temperature according to the hydraulic part of the embodiment of the invention chemical ingredients with steel.
Table 1 embodiment chemical ingredients (weight, %)
| Embodiment | C | Si | Mn | Cr | Al | Ti | P | S | Mo | Fe |
| 1 | 0.28 | 0.28 | 0.85 | 1.05 | 0.023 | 0.067 | 0.017 | 0.035 | 0.010 | Surplus |
| 2 | 0.29 | 0.26 | 0.86 | 1.06 | 0.025 | 0.068 | 0.018 | 0.036 | 0.011 | Surplus |
| 3 | 0.28 | 0.25 | 0.87 | 1.05 | 0.026 | 0.069 | 0.018 | 0.032 | 0.009 | Surplus |
Table 2 continuous casting molten steel temperature in tundish, casting speed, billet heating temperature, time and finishing temperature
Extract 3 samples in the steel from embodiment, test its hardening capacity performance.900～920 ℃ of normalizing temperatures, end quenching temperature are tested terminal hardening capacity situation for 880 ± 5 ℃ and are seen table 3, and mechanical property and hardness detect sees table 4.
Table 3 sample hardening capacity test case
Table 4 sample mechanical property and hardness test situation
Can find out that by top table 3 and table 4 hardening capacity of finished product, mechanical property and surface hardness all meet the requirements.The hot rolling attitude is organized as perlite+ferritic structure, and crystal grain is tiny.
Compared with prior art, the excellent results of technical scheme of the present invention is following:
The first, the multi-element alloyed mode of composition of steel design employing of the present invention improves the hardening capacity and the wear resisting property of steel, and dense structure exempts from the thermal treatment of annealing, and cost is lower;
The second, the present invention through optimizing ME, reduces C content and is prone to cutting S element with adding in production engineering, has reduced hardness and has improved the broaching performance, has satisfied the requirement of engineering hydraulic part processibility.
Although describe the present invention in detail, the invention is not restricted to this with reference to specific embodiment of the present invention.Under all situations that does not break away from the spirit and scope of the present invention, can make various variations in form and details.Scope of the present invention is limited claim and equivalent thereof.
Claims (10)
1. a hydraulic part is with the preparation method of steel, and said method comprises smelting, LF external refining, casting, rolling gentle cooling working procedure, it is characterized in that:
1) in smelting procedure, the operation of electrosmelting whole process making foamed slag, control terminal point [C], [P]; 1620 ℃-1680 ℃ of the tapping temperatures of molten steel; Preliminary dexidation adds steel core aluminium amount 0.5～2.0kg/t steel in the ladle, and the molten steel tap reaches at 1/4 o'clock, carries out the ladle interalloyization;
2) in LF external refining operation, refining slag basicity is 3.0-3.5, and the white slag hold-time was fed the sulphur line greater than 20 minutes, and vacuum tightness is less than 67Pa, and the hold-time, the soft blow argon time was 10-15 minute behind the VD greater than 12 minutes;
3) in the casting operation, adopt the continuous casting strand, adopt induction stirring in the continuous casting, the control tundish temperature is 1520 ℃-1535 ℃, and pulling rate is 0.6m/min～0.8m/min;
4) in rolling process, control process furnace soaking temperature is 1140 ℃-1240 ℃, and be 2-3 hour heat-up time, and start rolling temperature is 1080 ℃-1130 ℃, and finishing temperature is 850 ℃-950 ℃;
5) slow cooling, slow cooling speed be at 1.0-1.5 ℃/min,
Wherein, The hydraulic part that makes comprises C:0.22-0.32%, Si:0.17-0.37%, Mn:0.80-1.30%, Cr:1.0-1.40%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.015～0.060%, Al:0.005-0.070%, Ti:0.04-0.15% by mass percentage with the chemical ingredients of steel, and all the other are Fe and unavoidable impurities.
2. hydraulic part as claimed in claim 1 is characterized in that in step 1) that with the method for manufacture of steel control terminal point [C] is 0.10～0.15wt%, [P]≤0.015wt%.
3. hydraulic part as claimed in claim 1 is characterized in that in step 2 with the method for manufacture of steel) in, the add-on of sulphur line is 0.28kg/t～0.67kg/t steel.
4. hydraulic part as claimed in claim 1 is characterized in that in step 3) with the method for manufacture of steel, adopts the low overheat casting.
5. hydraulic part as claimed in claim 1 is characterized in that in step 1) with the method for manufacture of steel, when carrying out the ladle alloying, adds Gao Meng, middle chromium, molybdenum-iron, silicomanganese, and wherein, C, Si, Mn, Cr are by the control of specification lower limit add-on.
6. hydraulic part as claimed in claim 5 is characterized in that in step 2 with the method for manufacture of steel) in, add Gao Meng, Gao Ge, ferrosilicon, molybdenum-iron, aluminum steel, titanium wire according to analytical results, the adjustment component content.
7. hydraulic part as claimed in claim 1 is characterized in that in step 5) with the method for manufacture of steel, adopts stacking slow cooling.
Like any described hydraulic part in the claim 1 to 7 with the method for manufacture of steel; The hydraulic part that it is characterized in that making comprises C:0.22-0.31%, Si:0.17-0.37%, Mn:0.80-1.20%, Cr:1.0-1.30%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.020～0.060%, Al:0.005-0.070%, Ti:0.04-0.10% by mass percentage with the chemical ingredients of steel, and all the other are Fe and unavoidable impurities.
9. a hydraulic part is used steel; It is characterized in that said hydraulic part comprises C:0.22-0.32%, Si:0.17-0.37%, Mn:0.80-1.30%, Cr:1.0-1.40%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.015～0.060%, Al:0.005-0.070%, Ti:0.04-0.15% by mass percentage with the chemical ingredients of steel, all the other are Fe and unavoidable impurities.
10. hydraulic part according to claim 9 is used steel; It is characterized in that said hydraulic part comprises C:0.22-0.31%, Si:0.17-0.37%, Mn:0.80-1.20%, Cr:1.0-1.30%, Mo:0.003～0.015%, Ni≤0.25%, P≤0.030%, S:0.020～0.060%, Al:0.005-0.070%, Ti:0.04-0.10% by mass percentage with the chemical ingredients of steel, all the other are Fe and unavoidable impurities.
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| CN102794424A (en) * | 2012-08-08 | 2012-11-28 | 内蒙古包钢钢联股份有限公司 | Method for controlling impurities in steel |
| CN102925811A (en) * | 2012-11-12 | 2013-02-13 | 莱芜钢铁集团有限公司 | Easy-cutting vanadium-feeding high-aluminum nitriding steel and preparation method thereof |
| CN104195289A (en) * | 2014-08-13 | 2014-12-10 | 中原特钢股份有限公司 | Alloying process for adjusting nickel content in steel |
| CN104498666A (en) * | 2014-12-26 | 2015-04-08 | 芜湖金龙模具锻造有限责任公司 | Manufacturing method of alloy steel for pump |
| CN104789734A (en) * | 2015-04-03 | 2015-07-22 | 山东钢铁股份有限公司 | Smelting method of sulfur bearing steel |
| CN104878321A (en) * | 2015-04-21 | 2015-09-02 | 中信重工机械股份有限公司 | Process for melting 25Cr2Ni4MoV rotor steel |
| CN105420445A (en) * | 2015-11-12 | 2016-03-23 | 舞阳钢铁有限责任公司 | Method for smelting coarse-grained steel |
| CN105238994A (en) * | 2015-11-25 | 2016-01-13 | 山东钢铁股份有限公司 | Steels for train buffers and preparation method thereof |
| CN105463320A (en) * | 2015-12-06 | 2016-04-06 | 辽宁宏昌重工股份有限公司 | High-strength wear-resistant steel for track shoe and preparing method for high-strength wear-resistant steel |
| CN105925908A (en) * | 2016-06-16 | 2016-09-07 | 安庆市吉安汽车零件锻轧有限公司 | Automobile axle material |
| CN106086671A (en) * | 2016-06-16 | 2016-11-09 | 安庆市吉安汽车零件锻轧有限公司 | A kind of axle alloy steel nitride |
| CN111534759A (en) * | 2020-06-15 | 2020-08-14 | 建龙北满特殊钢有限责任公司 | Processing method for improving end cracking of high-hardenability steel after annealing |
| CN111534759B (en) * | 2020-06-15 | 2022-03-22 | 建龙北满特殊钢有限责任公司 | Processing method for improving end cracking of high-hardenability steel after annealing |
| CN113817966A (en) * | 2021-09-18 | 2021-12-21 | 建龙北满特殊钢有限责任公司 | Optimized production method of alloy structural steel |
| CN114182061A (en) * | 2021-10-22 | 2022-03-15 | 南京钢铁股份有限公司 | Smelting method of steel for high-speed rail brake disc |
| CN115233090A (en) * | 2022-06-17 | 2022-10-25 | 山东钢铁股份有限公司 | Low-carbon steel for track pin sleeve and preparation method thereof |
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