CN104087849A - Lifting jack top cap - Google Patents
Lifting jack top cap Download PDFInfo
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- CN104087849A CN104087849A CN201410328247.6A CN201410328247A CN104087849A CN 104087849 A CN104087849 A CN 104087849A CN 201410328247 A CN201410328247 A CN 201410328247A CN 104087849 A CN104087849 A CN 104087849A
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Abstract
The invention discloses a lifting jack top cap which comprises the following components in percentage by weight: 1.2-1.4% of C, 12.5-13.0% of Mn, 0.7-0.9% of Si, 2.6-2.8% of Cr, 0.4-0.6% of Mo, at most 0.01% of S, at most 0.01% of P, 0.05-0.1% of Re and the balance of Fe. The components of the top cap are changed to enhance the hardness and tensile strength to 200-240 HRB and 240-280 MPa, thereby satisfying the demands for production and living; and the service life of the lifting jack is prolonged, thereby saving the cost and reducing the waste.
Description
Technical field
The present invention relates to technical field of jacks, be specifically related to a kind of screw block top cap.
Background technology
Screw block is a kind of with lifting part as equipment, the light little weight handling equipment of jacking weight in stroke by top bracket or bottom claw in rigidity top.Screw block is mainly used in the department such as factories and miness, communications and transportation for Mechanical Help and other lifting, support etc.Its structure is firm, flexibility and reliability lightly, and a people is portability and operation.
Screw block is divided into two kinds of mechanic jacks and whisky jack, and principle is had nothing in common with each other.Principle, whisky jack based on principle be pascal's principle, that is: liquid pressure is everywhere consistent, like this, in the system of balance, above smaller piston, applied pressure is smaller, and on large piston, applied pressure is also larger, can keep like this static of liquid.So by the transmission of liquid, can obtain the different pressure on different ends, so just can reach the object of a conversion.We common to whisky jack be exactly to have utilized this principle to reach the transmission of power.Mechanic jacks adopts theory of machines, and back and forth to pull handle, pusher dog promotes the revolution of ratchet gap, and conical pinion drives large bevel gear, makes the rotation of weight lifting screw rod, hoists or declines, and reach the function of lifting pulling force thereby jacking sleeve is obtained.
Screw block is generally that top cap is stressed, and this just requires it to have very large tensile strength and hardness.The hardness of top of the prior art cap is 150-180HRB, and tensile strength is 200MPa.Along with social development, hardness, the tensile strength of top of the prior art cap can not be satisfied the demand.
Summary of the invention
For the problems referred to above, the invention provides a kind of screw block top cap, there is higher hardness and tensile strength.
In order to address the above problem, technical scheme provided by the invention is:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.2-1.4%, Mn:12.5-13.0%, Si:0.7-0.9%, Cr:2.6-2.8%, Mo:0.4-0.6%, S :≤0.01%, P :≤0.01%, Re:0.05-0.1%; Surplus is Fe.
Preferably, each composition and weight percent thereof are: C:1.25-1.4%, Mn:12.6-13.0%, Si:0.76-0.9%, Cr:2.65-2.8%, Mo:0.45-0.6%, S :≤0.01%, P :≤0.01%, Re:0.06-0.1%; Surplus is Fe.
Preferably, each composition and weight percent thereof are: C:1.28%, Mn:12.8%, Si:0.82%, Cr:2.75%, Mo:0.48%, S:0.01%, P:0.008%, Re:0.07%; Surplus is Fe.
The preparation method of described screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1560-1580 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 15-20%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1400-1420 DEG C, cast duration is not more than 7 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 320-340 DEG C, be incubated 1.6-2 hours, in the time that temperature is 520-540 DEG C, be incubated 2-2.4 hours, in the time that temperature is 800-820 DEG C, be incubated 1.6-1.8 hours;
(6) temper: in the time that temperature is 220-240 DEG C, be incubated 1.5-1.8 hours, in the time that temperature is 380-420 DEG C, be incubated 2-2.2 hours.
C: form stable compound with Fe, Cr, Mn, improve its hardness and wear resistance by thermal treatment; C and other elements produce synergy, put forward tall hat over-all properties.
Mn: be strengthening element, strengthening matrix, can thinning microstructure, improves intensity, hardness, wear resistance.
Cr: improve the hardening capacity of material, can effectively prevent that the graphite of free state from producing, make common cementite change alloyed cementite into, improve overall intensity and hardness.
Mo: can effectively suppress cementite and assemble, strengthening austenite structure, increases intensity and hardness, and strain-hardening performance strengthens, thereby improves fastness to wear.
Re: improve toughness and wear resistance.Add Re to make grain refining, inclusion even dispersion distributes, and pattern, taking spherical as main, weakens the isolate effect of inclusion to matrix.
Compared with prior art, beneficial effect of the present invention is:
Top of the present invention cap, by changing its composition, has improved its hardness and tensile strength, hardness: 200-240HRB, and tensile strength: 240-280MPa, has met the needs of production, life; In the work-ing life of also having improved screw block, provide cost savings, and reduced waste.
Embodiment
The present invention will be further described below:
Embodiment 1:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.28%, Mn:12.8%, Si:0.82%, Cr:2.75%, Mo:0.48%, S:0.01%, P:0.008%, Re:0.07%; Surplus is Fe.
The preparation method of screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1568 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 18%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1410 DEG C, cast duration 7 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 325 DEG C, be incubated 1.8 hours, in the time that temperature is 530 DEG C, be incubated 2.2 hours, in the time that temperature is 805 DEG C, be incubated 1.75 hours;
(6) temper: in the time that temperature is 225 DEG C, be incubated 1.7 hours, in the time that temperature is 390 DEG C, be incubated 2.1 hours.
C: form stable compound with Fe, Cr, Mn, improve its hardness and wear resistance by thermal treatment; C and other elements produce synergy, put forward tall hat over-all properties.
Mn: be strengthening element, strengthening matrix, can thinning microstructure, improves intensity, hardness, wear resistance.
Cr: improve the hardening capacity of material, can effectively prevent that the graphite of free state from producing, make common cementite change alloyed cementite into, improve overall intensity and hardness.
Mo: can effectively suppress cementite and assemble, strengthening austenite structure, increases intensity and hardness, and strain-hardening performance strengthens, thereby improves fastness to wear.
Re: improve toughness and wear resistance.Add Re to make grain refining, inclusion even dispersion distributes, and pattern, taking spherical as main, weakens the isolate effect of inclusion to matrix.
Embodiment 2:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.2%, Mn:13.0%, Si:0.7%, Cr:2.8%, Mo:0.4%, S:0.01%, P:0.01%, Re:0.1%; Surplus is Fe.
The preparation method of screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1560 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 20%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1400 DEG C, cast duration 6 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 320 DEG C, be incubated 2 hours, in the time that temperature is 52 DEG C, be incubated 2.4 hours, in the time that temperature is 800 DEG C, be incubated 1.8 hours;
(6) temper: in the time that temperature is 220 DEG C, be incubated 1.8 hours, in the time that temperature is 380 DEG C, be incubated 2.2 hours.
Embodiment 3:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.4%, Mn:12.5%, Si:0.9%, Cr:2.6%, Mo:0.6%, S:0.008%, P:0.007%, Re:0.05%; Surplus is Fe.
The preparation method of screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1580 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 15%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1420 DEG C, cast duration 5 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 340 DEG C, be incubated 1.6 hours, in the time that temperature is 540 DEG C, be incubated 2 hours, in the time that temperature is 820 DEG C, be incubated 1.6 hours;
(6) temper: in the time that temperature is 240 DEG C, be incubated 1.5 hours, in the time that temperature is 420 DEG C, be incubated 2 hours.
Embodiment 4:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.2%, Mn:12.5%, Si:0.9%, Cr:2.8%, Mo:0.4%, S:0.01%, P:0.008%, Re:0.06%; Surplus is Fe.
The preparation method of screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1575 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 17%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1415 DEG C, cast duration is not more than 7 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 326 DEG C, be incubated 1.7 hours, in the time that temperature is 535 DEG C, be incubated 2.3 hours, in the time that temperature is 816 DEG C, be incubated 1.75 hours;
(6) temper: in the time that temperature is 235 DEG C, be incubated 1.6 hours, in the time that temperature is 400 DEG C, be incubated 2.15 hours.
Embodiment 5:
A kind of screw block top cap, each composition and weight percent thereof are: C:1.28%, Mn:12.7%, Si:0.86%, Cr:2.64%, Mo:0.56%, S:0.006%, P:0.01%, Re:0.09%; Surplus is Fe.
The preparation method of screw block top cap, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1570 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 18%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1410 DEG C, cast duration is not more than 7 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 330 DEG C, be incubated 1.7 hours, in the time that temperature is 525 DEG C, be incubated 2.35 hours, in the time that temperature is 816 DEG C, be incubated 1.68 hours;
(6) temper: in the time that temperature is 230 DEG C, be incubated 1.7 hours, in the time that temperature is 410 DEG C, be incubated 2.15 hours.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification sheets, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. a screw block top cap, is characterized in that: each composition and weight percent thereof are: C:1.2-1.4%, Mn:12.5-13.0%, Si:0.7-0.9%, Cr:2.6-2.8%, Mo:0.4-0.6%, S :≤0.01%, P :≤0.01%, Re:0.05-0.1%; Surplus is Fe.
2. screw block according to claim 1 top cap, is characterized in that: each composition and weight percent thereof are: C:1.25-1.4%, Mn:12.6-13.0%, Si:0.76-0.9%, Cr:2.65-2.8%, Mo:0.45-0.6%, S :≤0.01%, P :≤0.01%, Re:0.06-0.1%; Surplus is Fe.
3. screw block according to claim 1 top cap, is characterized in that: each composition and weight percent thereof are: C:1.28%, Mn:12.8%, Si:0.82%, Cr:2.75%, Mo:0.48%, S:0.01%, P:0.008%, Re:0.07%; Surplus is Fe.
4. the preparation method of screw block according to claim 1 top cap, is characterized in that, comprises the following steps:
(1) adopt intermediate frequency furnace to carry out melting, temperature: 1560-1580 DEG C; Raw material: steel scrap 20%, the pig iron 70%, feed back 10%, after melting, carry out sampling analysis, each composition will meet the requirements;
(2) inoculation: carry out at twice, add for the first time the Re of total amount 15-20%, breed with iron liquid stream in the time tapping a blast furnace for the second time;
(3) cast: temperature is 1400-1420 DEG C, cast duration is not more than 7 minutes;
(4) be cooled to after room temperature, unpack, polishing, deburring;
(5) quench treatment: in the time that temperature is 320-340 DEG C, be incubated 1.6-2 hours, in the time that temperature is 520-540 DEG C, be incubated 2-2.4 hours, in the time that temperature is 800-820 DEG C, be incubated 1.6-1.8 hours;
(6) temper: in the time that temperature is 220-240 DEG C, be incubated 1.5-1.8 hours, in the time that temperature is 380-420 DEG C, be incubated 2-2.2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410328247.6A CN104087849B (en) | 2014-07-10 | 2014-07-10 | A kind of screw block top cap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410328247.6A CN104087849B (en) | 2014-07-10 | 2014-07-10 | A kind of screw block top cap |
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| Publication Number | Publication Date |
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| CN104087849A true CN104087849A (en) | 2014-10-08 |
| CN104087849B CN104087849B (en) | 2016-04-27 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068857A (en) * | 1991-10-10 | 1993-02-10 | 株洲市机械工业研究所 | The multicomponent alloy malleablized high-Mn steel |
| CN1363712A (en) * | 2001-10-22 | 2002-08-14 | 刘承刚 | High-strength alloyed cast steel with high resistance to wear and impact and its preparing process |
| CN101469390A (en) * | 2007-12-25 | 2009-07-01 | 张莹 | Wear resistant steel cast and method for manufacturing the same |
| CN101709430A (en) * | 2009-12-07 | 2010-05-19 | 淮阴工学院 | High manganese steel crusher hammer with high original hardness and manufacturing method thereof |
| EP2465964A1 (en) * | 2010-12-14 | 2012-06-20 | Fundacion Inasmet | Hadfield steel with Hafnium |
-
2014
- 2014-07-10 CN CN201410328247.6A patent/CN104087849B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1068857A (en) * | 1991-10-10 | 1993-02-10 | 株洲市机械工业研究所 | The multicomponent alloy malleablized high-Mn steel |
| CN1363712A (en) * | 2001-10-22 | 2002-08-14 | 刘承刚 | High-strength alloyed cast steel with high resistance to wear and impact and its preparing process |
| CN101469390A (en) * | 2007-12-25 | 2009-07-01 | 张莹 | Wear resistant steel cast and method for manufacturing the same |
| CN101709430A (en) * | 2009-12-07 | 2010-05-19 | 淮阴工学院 | High manganese steel crusher hammer with high original hardness and manufacturing method thereof |
| EP2465964A1 (en) * | 2010-12-14 | 2012-06-20 | Fundacion Inasmet | Hadfield steel with Hafnium |
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| CN104087849B (en) | 2016-04-27 |
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