CN104789871A - 27SiMn seamless steel tube for thick-wall cold-drawn hydraulic cylinder barrel and preparation method - Google Patents
27SiMn seamless steel tube for thick-wall cold-drawn hydraulic cylinder barrel and preparation method Download PDFInfo
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- CN104789871A CN104789871A CN201510159559.3A CN201510159559A CN104789871A CN 104789871 A CN104789871 A CN 104789871A CN 201510159559 A CN201510159559 A CN 201510159559A CN 104789871 A CN104789871 A CN 104789871A
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Abstract
The invention discloses a 27SiMn seamless steel tube for a thick-wall cold-drawn hydraulic cylinder barrel. The 27SiMn seamless steel tube comprises chemical components in percentage by mass as follows: 0.26%-0.31% of C, 1.20%-1.40% of Si, 1.20%-1.40% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.20%-0.30% of Cr, 0.015%-0.04% of Al and the balance of Fe, and the sum of the mass percentages is 100%. The invention further discloses a preparation method of the 27SiMn seamless steel tube for the thick-wall cold-drawn hydraulic cylinder barrel. The seamless steel tube prepared with the method has a good comprehensive mechanical property and can meet the performance of the cold-drawn hydraulic cylinder barrel with the wall thickness larger than or equal to 20 mm.
Description
Technical field
The present invention relates to metallurgical technology field, be specifically related to a kind of heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube and preparation method.
Background technology
27SiMn is a kind of hydraulic prop weldless steel tube material, be used for the mining hydraulic bracket in colliery, the hydro-cylinder of truck-mounted crane, piston, the specific equipments such as big machinery, a lot of enterprise is by being used for hydraulic support by after 27SiMn cold-drawing seamless tube in recent years, common 27SiMn hardening capacity is poor, produce thick-walled tube time thoroughly do not make the comprehensive mechanical property of material poor owing to quenching, easily brittle failure is there is in Cold Drawing Process, the problem such as to pull, and in Cold Drawing Process, need steel pipe to have good size deviation planeness, therefore develop the heavy wall 27SiMn weldless steel tube that surfaces externally and internally quality well has a good comprehensive mechanical property simultaneously and have important meaning.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube.
To achieve these objectives, a kind of heavy wall cold-drawn of the present invention hydraulic cylinder 27SiMn weldless steel tube, its chemical composition mass percent is: C 0.26 ~ 0.31%, Si 1.20 ~ 1.40%, Mn 1.20 ~ 1.40%, P≤0.020%, S≤0.010%, Cr 0.20 ~ 0.30%, Al 0.015 ~ 0.04%, all the other are Fe, and massfraction amounts to 100%.Add by the addition of C r element the hardening capacity improving steel, material has good comprehensive mechanical property after heat treatment.
Further: the chemical composition mass percentage of described heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube material is: C 0.26%, Si 0.1.20%, Mn 1.20%, Cr 0.20%, Al 0.015%, P 0.02%, S 0.010%, all the other are Fe, and massfraction amounts to 100%; Or, C 0.28%, Si 1.25%, Mn 1.25%, Cr 0.22%, Al 0.020%, P 0.015%, S 0.008% all the other be Fe, massfraction amounts to 100%; Or C 0.29%, Si 1.30%, Mn 1.30%, Cr 0.25%, Al 0.030%, P 0.013%, S 0.007%, all the other are Fe, massfraction amounts to 100%; Or, C 0.30%, Si 1.35%, Mn1.35%, Cr 0.27%, Al 0.035%, P 0.013%, S 0.006% all the other be Fe, massfraction amounts to 100%; Or, C 0.31%, Si 1.40%, Mn 1.40%, Cr 0.30%, Al 0.04%, P 0.02%, S 0.010% all the other be Fe, massfraction amounts to 100%.
Another technical problem that the present invention solves is to provide a kind of preparation method of heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube, makes steel pipe have good dimensional precision and surfaces externally and internally quality by the rolling of Φ 460mmPQF unit simultaneously.
Technical scheme of the present invention is as follows:
A preparation method for heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube, comprising: the operation of rolling of steelmaking process, steel and heat treatment process.The mass percentage of the 27SiMn weldless steel tube material chemical composition obtained is C 0.26 ~ 0.31%, Si 1.20 ~ 1.40%, Mn 1.20 ~ 1.40%, P≤0.020%, S≤0.010%, Cr 0.20 ~ 0.30%, Al 0.015 ~ 0.04%, all the other are Fe, and massfraction amounts to 100%.
Further, described steelmaking process comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting.
Further: converter smelting adopts desulphurised hot metal, and in pre-desulphurised hot metal, S content controls at below 120ppm, the carbon content of converter terminal wants >=0.06% to reduce the activity of oxygen in steel, finely tunes composition according to going out in composition of steel LF refining of converter.In VD vacuum outgas, vacuum tightness≤0.1KPa, adopts stronger bottom blowing argon gas pattern, the silicon-calcium wire feeding 150m after VD vacuum then keep soft blow time >=13min, to ensure that inclusion fully floats.Keep low superheating temperature in casting process, superheating temperature controls within 30 DEG C, and adopt constant casting speed control, speed control is at 1 ~ 1.2m/min simultaneously.
Further, the operation of rolling of described steel comprises: circle base → sawing → heating → perforation → tube rolling → de-pipe → sizing → cooling → crop end.Heating of pipe blank temperature is 1240 ~ 1290 DEG C; Circle base piercing temperature is 1220 ~ 1250 DEG C; Tube rolling temperature is 1100 ~ 1220 DEG C; Ensure finishing temperature >=880 DEG C.
Further, roll state steel heat treatment process described in comprise: quenching adds tempering; Quenching temperature is 920 ± 15 DEG C, is incubated 60 ~ 70 minutes; Tempering temperature is 610 ± 10 DEG C, is incubated 80 ~ 90 minutes.
Technique effect of the present invention is as follows:
The basis of heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube of the present invention by original common 27SiMn adds and appropriate can improve hardening capacity element Cr, thus improve the hardening capacity of steel, make when production thick-walled seamless steel pipes that thermal treatment can through hardening, steel is made to have good comprehensive mechanical property by tempering, then utilize the rolling of Φ 460PQF unit to make steel pipe have good surfaces externally and internally quality and dimensional precision, the cold-drawn ensureing follow-up provides the steel pipe of superperformance.
Embodiment
Below in conjunction with embodiment, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
Steelmaking process is: pre-desulphurised hot metal → converter smelting → VD vacuum outgas → LF refining → round billet continuous casting.Converter smelting adopts desulphurised hot metal, and silicomanganese, ferromanganese and ferrochrome deoxidation alloying, smelted by converter.Adopt single slag melting technique, finishing slag basicity controls 3.0, the carbon content of converter terminal wants >=0.06% to reduce the activity of oxygen in steel, composition is finely tuned in LF refining according to converter tapping composition, in VD vacuum outgas, vacuum tightness≤0.1KPa, adopts stronger bottom blowing argon gas pattern, according to every 100 tons of molten steel feeding 150m silicon-calcium wire after dark vacuum, soft blow time maintenance >=13min after VD vacuum.Control superheating temperature≤30 DEG C of molten steel, adopt constant casting speed control technique, speed control is at 1 ~ 1.2m/min.
The operation of rolling of steel comprises: circle base → sawing → heating → perforation → tube rolling → de-pipe → sizing → cooling → crop end.Heating of pipe blank temperature is 1240 ~ 1290 DEG C, should ensure that heating of pipe blank equal control grain fineness number size prevents decarburization again.During its circle base perforation, temperature is 1220 ~ 1250 DEG C, and when ensureing to bore a hole, pipe has good deformability; During tube rolling, temperature is 1100 ~ 1220 DEG C, and this steel at this temperature plasticity is best, and during rolling, resistance to deformation is little, effectively can ensure the quality of hollow forging surfaces externally and internally; Ensure finishing temperature >=880 DEG C, the high steel pipe that is equivalent to of finishing temperature carries out a normalizing, can crystal grain thinning, eliminates stress, and alleviating banded structure for finished heat treatment provides suitable structural state.
Roll state steel heat treatment process to comprise: quenching+tempering.Quenching temperature is 920 ± 15 DEG C, is incubated 60 ~ 70 minutes, and this temperature can ensure that the whole austenitizing of material can not make coarse grains again; Tempering temperature is 610 ± 10 DEG C, is incubated 80 ~ 90 minutes, to ensure that material has good comprehensive mechanical property.Enter straightener after tempering fast to ensure that steel pipe has good planeness, the stress of steel can be reduced again.
The thick-walled tube cold-drawn hydraulic cylinder 27SiMn weldless steel tube mass percentage that said process is produced is: C 0.26 ~ 0.31%, Si 1.20 ~ 1.40%, Mn 1.20 ~ 1.40%, P≤0.020%, S≤0.010%, Cr 0.20 ~ 0.30%, Al 0.015 ~ 0.04%, all the other are Fe, and massfraction amounts to 100%.The basis of conventional 27SiMn adding the hardening capacity that steel usually improves in appropriate Cr unit, making the material when producing thick-walled tube have good comprehensive mechanical property.
Detect the chemical composition of each example, chemical composition is as shown in table 1:
The each exemplary chemical composition (%) of table 1
| Embodiment | C | Si | Mn | P | S | Cr | Al |
| Embodiment 1 | 0.26 | 1.20 | 1.20 | 0.020 | 0.01 | 0.20 | 0.015 |
| Embodiment 2 | 0.28 | 1.25 | 1.25 | 0.015 | 0.008 | 0.22 | 0.020 |
| Embodiment 3 | 0.29 | 1.30 | 1.30 | 0.013 | 0.007 | 0.25 | 0.030 |
| Embodiment 4 | 0.30 | 1.35 | 1.35 | 0.013 | 0.006 | 0.27 | 0.035 |
| Embodiment 5 | 0.31 | 1.40 | 1.40 | 0.010 | 0.02 | 0.31 | 0.040 |
Each embodiment chemico-mechanic the performance test results is as shown in table 2.
The mechanical experimental results of each embodiment of table 2
As can be seen from Table 2, weldless steel tube material of the present invention has good mechanical property, particularly material and has very high toughness, in follow-up Cold Drawing Process, and the problem such as brittle failure can not occur, pull.
Above-described embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (7)
1. a heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube, it is characterized in that: described steel pipe chemical composition mass percent is: C 0.26 ~ 0.31%, Si 1.20 ~ 1.40%, Mn 1.20 ~ 1.40%, P≤0.020%, S≤0.010%, Cr 0.20 ~ 0.30%, Al 0.015 ~ 0.04%, and all the other are Fe.
2. prepare a method for heavy wall cold-drawn hydraulic cylinder 27SiMn weldless steel tube as claimed in claim 1, it is characterized in that: production process comprises: hot metal pretreatment, converter smelting, LF refining, VD degassed and round billet continuous casting, heating of pipe blank, tandem rolling and thermal treatment.
3. the heavy wall cold-drawn hydraulic cylinder preparation method of 27SiMn weldless steel tube as claimed in claim 2, is characterized in that: described converter smelting adopts desulphurised hot metal, carbon content >=0.06% of converter terminal.
4. the heavy wall cold-drawn hydraulic cylinder as claimed in claim 2 preparation method of 27SiMn weldless steel tube, it is characterized in that: in described VD vacuum outgas, vacuum tightness≤0.1KPa, adopt bottom blowing argon gas pattern, by every 100 tons of molten steel feeding 150m silicon-calcium wire after dark vacuum terminates, soft blow time maintenance >=13min after VD vacuum.
5. the heavy wall cold-drawn hydraulic cylinder preparation method of 27SiMn weldless steel tube as claimed in claim 2, it is characterized in that: superheating temperature≤30 DEG C in described round billet continuous casting process, pulling rate is 1 ~ 1.2m/min.
6. the heavy wall cold-drawn hydraulic cylinder preparation method of 27SiMn weldless steel tube as claimed in claim 2, is characterized in that: described heating of pipe blank temperature is 1240 ~ 1290 DEG C; Circle base piercing temperature is 1220 ~ 1250 DEG C; Tube rolling temperature is 1100 ~ 1220 DEG C; Finishing temperature >=880 DEG C.
7. the heavy wall cold-drawn hydraulic cylinder preparation method of 27SiMn weldless steel tube as claimed in claim 2, is characterized in that: described heat treatment process comprises: quenching adds tempering, and quenching temperature is 920 ± 15 DEG C, is incubated 60 ~ 70 minutes; Tempering temperature is 610 ± 10 DEG C, is incubated 80 ~ 90 minutes.
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| CN201510159559.3A CN104789871A (en) | 2015-04-07 | 2015-04-07 | 27SiMn seamless steel tube for thick-wall cold-drawn hydraulic cylinder barrel and preparation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304529A (en) * | 2019-12-02 | 2020-06-19 | 张子夜 | Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof |
| CN114395719A (en) * | 2021-12-02 | 2022-04-26 | 安阳钢铁股份有限公司 | Production method of alloy steel 27SiMn hot rolled steel strip |
| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304529A (en) * | 2019-12-02 | 2020-06-19 | 张子夜 | Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof |
| RU2758739C1 (en) * | 2019-12-02 | 2021-11-01 | Цзые ЧЖАН | Seamless steel pipe for multistage oil cylinder and its manufacturing method |
| CN114395719A (en) * | 2021-12-02 | 2022-04-26 | 安阳钢铁股份有限公司 | Production method of alloy steel 27SiMn hot rolled steel strip |
| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
| CN114619004B (en) * | 2022-02-28 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed seamless steel tube for cold drawn high-strength hydraulic cylinder barrel and preparation method thereof |
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Application publication date: 20150722 |
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