CN104878290A - High-hot-strength material for hydraulic spanner pistons and preparation method thereof - Google Patents
High-hot-strength material for hydraulic spanner pistons and preparation method thereof Download PDFInfo
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- CN104878290A CN104878290A CN201510239069.4A CN201510239069A CN104878290A CN 104878290 A CN104878290 A CN 104878290A CN 201510239069 A CN201510239069 A CN 201510239069A CN 104878290 A CN104878290 A CN 104878290A
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Abstract
The invention relates to a high-hot-strength material for hydraulic spanner pistons, which contains the following chemical components in percentage by mass: 1.8-2.2% of C, 0.02-0.05% of Sc, 0.5-0.9% of Mn, 0.04-0.9% of Ca, 0.015-0.035% of Co, 0.02-0.04% of Sr, 2.2-2.6% of Si, at most 0.02% of S, at most 0.03% of P, and the balance of Fe. The piston material has the advantages of higher hot strength, favorable dimensional stability, favorable resistance to atmospheric corrosion, high yield point and favorable toughness. The production method enhances the crack resistance of the casting, improves the hardness and abrasion resistance of the piston surface and effectively prolongs the service life of the piston. The nodulizer and inoculant can enhance the roundness of the graphite, and effectively enhance the mechanical properties of the ductile iron casting, so that the ductile iron casting has high tensile strength.
Description
Technical field
The present invention relates to casting technology field, particularly relate to a kind of high-heat strength hydraulic spanner piston material and preparation method thereof.
Background technology
Hydraulic spanner is applied to all trades and professions, and hydraulic spanner forms primarily of three parts, body (being also housing), oil cylinder and drive disk assembly.Oil cylinder piston is the important composition parts of hydraulic spanner, is related to working efficiency and the security of spanner.
Current piston also also exists a lot of problem, also needs the hardness, wear resistance, dimensional stability, pore, yield-point, fatigue resistance, the erosion resistance that improve piston.The performance of piston can be improved by the composition and technique improving foundry goods.
Summary of the invention
The object of the present invention is to provide a kind of high-heat strength hydraulic spanner piston material and preparation method thereof, this piston material has higher hot strength, good stability of the dimension, and resistance to atmospheric corrosion is good, and yield-point is high, good toughness.
Technical scheme of the present invention is as follows:
A kind of high-heat strength hydraulic spanner piston material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C1.8-2.2, Sc 0.02-0.05, Mn0.5-0.9, Ca0.04-0.9, Co0.015-0.035, Sr 0.02-0.04, Si2.2-2.6, S≤0.02, P≤0.03, all the other are Fe.
The production method of described high-heat strength hydraulic spanner piston material, is characterized in that:
(1) raw material is sent into smelting pot, at 1550-1650 DEG C, after melting, detecting the content of each element in molten iron and adjusting each constituent content to meeting recipe requirements;
(2) nodulizing agent being equivalent to iron liquid weight 2.0-2.2% is poured into the side of dykes and dams in casting ladle, the first nucleating agent being equivalent to iron liquid weight 0.3-0.4% is covered on nodulizing agent equably, pour iron liquid, carry out spheroidizing and first time inoculation, pour residue iron liquid again, the second nucleating agent being equivalent to iron liquid weight 0.25-0.35% pours with stream, completes second time inoculation, cast, obtains ingot casting;
(3) ingot casting is heated to 950-1050 DEG C, insulation 5-6 hour, hardening is cooled to less than 100 DEG C, then ingot casting is heated to 600-700 DEG C, insulation 5-6 hour, then naturally cools to room temperature, carries out machine-shaping;
(4) whole piston is carried out surfaces nitrided process, the nitriding treatment degree of depth >=0.3mm, to obtain final product;
Described nodulizing agent is made up of the raw material of following weight part: Ba1-1.6, Mg10-12, Ca 1-1.5, Si10-13, rare earth 2-3, Fe82-86; Preparation method is; By Ba powder, Mg powder, Ca powder, Si powder, rare earth mixing, add the iron powder of 1/3, in argon atmosphere, be heated to iron powder fusing, stir, build, pulverize, cross 10 mesh sieves, obtain powder; Residue iron powder is added crucible, described powder injection is sent into the central authorities of iron powder, in argon atmosphere, be heated to 1510-1520 DEG C, roll is rolled into the thin slice that thickness is 4-5mm, then be ground into the particle that particle diameter is less than 4mm, to obtain final product;
Described first nucleating agent is made up of the raw material of following weight part: La0.1-0.3, Mg3-4, Ca2-4, Mn1-2, Nb0.4-0.7, Si25-30, Fe71-75; Preparation method is, is mixed by metal-powder, grinds 10-20 minute, to obtain final product in argon atmosphere;
Described first nucleating agent is made up of the raw material of following weight part: Y0.1-0.3, Mg2-3, Ca3-5, Mn2-4, Sr0.5-0.7, Si29-35, Fe71-75; Preparation method is, is mixed by metal-powder, grinds 10-20 minute, to obtain final product in argon atmosphere.
Beneficial effect of the present invention
The present invention's formula makes piston material have higher hot strength, good stability of the dimension, and resistance to atmospheric corrosion is good, and yield-point is high, good toughness; Production method of the present invention, add the cracking resistance of foundry goods, add hardness and the abrasion resistance of piston face, effectively extend the work-ing life of piston, nodulizing agent of the present invention and nucleating agent can make the roundness of graphite better, the mechanical property of effective raising nodular iron casting, tensile strength is high.
Embodiment
A kind of high-heat strength hydraulic spanner piston material, the chemical element composition that it contains and mass percent thereof are: C1.8-2.2, Sc 0.02-0.05, Mn0.5-0.9, Ca0.04-0.9, Co0.015-0.035, Sr 0.02-0.04, Si2.2-2.6, S≤0.02, P≤0.03, all the other are Fe.
The production method of described high-heat strength hydraulic spanner piston material is:
(1) raw material is sent into smelting pot, at 1600 DEG C, after melting, detecting the content of each element in molten iron and adjusting each constituent content to meeting recipe requirements;
(2) nodulizing agent being equivalent to iron liquid weight 2.1% is poured into the side of dykes and dams in casting ladle, the first nucleating agent being equivalent to iron liquid weight 0.3% is covered on nodulizing agent equably, pour iron liquid, carry out spheroidizing and first time inoculation, pour residue iron liquid again, the second nucleating agent being equivalent to iron liquid weight 0.3% pours with stream, completes second time inoculation, cast, obtains ingot casting;
(3) ingot casting is heated to 1000 DEG C, be incubated 5.5 hours, hardening is cooled to 90 DEG C, then ingot casting is heated to 650 DEG C, is incubated 5.5 hours, then naturally cools to room temperature, carry out machine-shaping;
(4) whole piston is carried out surfaces nitrided process, the nitriding treatment degree of depth is 0.35mm, to obtain final product;
Described nodulizing agent is made up of the raw material of following weight part (kilogram): Ba1.3, Mg11, Ca 1.3, Si12, rare earth 2.5, Fe84; Preparation method is; By Ba powder, Mg powder, Ca powder, Si powder, rare earth mixing, add the iron powder of 1/3, in argon atmosphere, be heated to iron powder fusing, stir, build, pulverize, cross 10 mesh sieves, obtain powder; Residue iron powder is added crucible, described powder injection is sent into the central authorities of iron powder, in argon atmosphere, be heated to 1515 DEG C, roll is rolled into the thin slice that thickness is 4mm, then be ground into the particle that particle diameter is less than 4mm, to obtain final product;
Described first nucleating agent is made up of the raw material of following weight part (kilogram): La0.2, Mg3.5, Ca3, Mn1.5, Nb0.5, Si27, Fe73; Preparation method is, is mixed by metal-powder, grinds 15 minutes, to obtain final product in argon atmosphere;
Described first nucleating agent is made up of the raw material of following weight part (kilogram): Y0.2, Mg2.5, Ca4, Mn3, Sr0.6, Si32, Fe73; Preparation method is, is mixed by metal-powder, grinds 15 minutes, to obtain final product in argon atmosphere.
Experimental data:
After tested, tensile strength is 604MPa to the material of this embodiment, and unit elongation is 11.2%, and yield strength is 378MPa, and surface hardness is 205HBW, and toughness is 9.7J/ ㎡.
Claims (2)
1. a high-heat strength hydraulic spanner piston material, is characterized in that: the chemical element composition that it contains and mass percent thereof are: C1.8-2.2, Sc 0.02-0.05, Mn0.5-0.9, Ca0.04-0.9, Co0.015-0.035, Sr 0.02-0.04, Si2.2-2.6, S≤0.02, P≤0.03, all the other are Fe.
2. the production method of high-heat strength hydraulic spanner piston material according to claim 1, is characterized in that:
(1) raw material is sent into smelting pot, at 1550-1650 DEG C, after melting, detecting the content of each element in molten iron and adjusting each constituent content to meeting recipe requirements;
(2) nodulizing agent being equivalent to iron liquid weight 2.0-2.2% is poured into the side of dykes and dams in casting ladle, the first nucleating agent being equivalent to iron liquid weight 0.3-0.4% is covered on nodulizing agent equably, pour iron liquid, carry out spheroidizing and first time inoculation, pour residue iron liquid again, the second nucleating agent being equivalent to iron liquid weight 0.25-0.35% pours with stream, completes second time inoculation, cast, obtains ingot casting;
(3) ingot casting is heated to 950-1050 DEG C, insulation 5-6 hour, hardening is cooled to less than 100 DEG C, then ingot casting is heated to 600-700 DEG C, insulation 5-6 hour, then naturally cools to room temperature, carries out machine-shaping;
(4) whole piston is carried out surfaces nitrided process, the nitriding treatment degree of depth >=0.3mm, to obtain final product;
Described nodulizing agent is made up of the raw material of following weight part: Ba1-1.6, Mg10-12, Ca 1-1.5, Si10-13, rare earth 2-3, Fe82-86; Preparation method is; By Ba powder, Mg powder, Ca powder, Si powder, rare earth mixing, add the iron powder of 1/3, in argon atmosphere, be heated to iron powder fusing, stir, build, pulverize, cross 10 mesh sieves, obtain powder; Residue iron powder is added crucible, described powder injection is sent into the central authorities of iron powder, in argon atmosphere, be heated to 1510-1520 DEG C, roll is rolled into the thin slice that thickness is 4-5mm, then be ground into the particle that particle diameter is less than 4mm, to obtain final product;
Described first nucleating agent is made up of the raw material of following weight part: La0.1-0.3, Mg3-4, Ca2-4, Mn1-2, Nb0.4-0.7, Si25-30, Fe71-75; Preparation method is, is mixed by metal-powder, grinds 10-20 minute, to obtain final product in argon atmosphere;
Described first nucleating agent is made up of the raw material of following weight part: Y0.1-0.3, Mg2-3, Ca3-5, Mn2-4, Sr0.5-0.7, Si29-35, Fe71-75; Preparation method is, is mixed by metal-powder, grinds 10-20 minute, to obtain final product in argon atmosphere.
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| CN201510239069.4A CN104878290A (en) | 2015-05-12 | 2015-05-12 | High-hot-strength material for hydraulic spanner pistons and preparation method thereof |
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| CN201510239069.4A CN104878290A (en) | 2015-05-12 | 2015-05-12 | High-hot-strength material for hydraulic spanner pistons and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893194A (en) * | 2017-10-27 | 2018-04-10 | 宁波市鄞州永佳电机工具有限公司 | A kind of high-performance spanner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3689255A (en) * | 1969-12-30 | 1972-09-05 | Sulzer Ag | Process for the production of cast iron with spherolites |
| JP2008285711A (en) * | 2007-05-16 | 2008-11-27 | Hino Motors Ltd | Method for manufacturing malleable cast iron, and piston manufactured by the method |
| CN104498813A (en) * | 2014-12-10 | 2015-04-08 | 马鞍山市益华液压机具有限公司 | Heat-resistant material for hydraulic spanner piston and preparation method thereof |
-
2015
- 2015-05-12 CN CN201510239069.4A patent/CN104878290A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3689255A (en) * | 1969-12-30 | 1972-09-05 | Sulzer Ag | Process for the production of cast iron with spherolites |
| JP2008285711A (en) * | 2007-05-16 | 2008-11-27 | Hino Motors Ltd | Method for manufacturing malleable cast iron, and piston manufactured by the method |
| CN104498813A (en) * | 2014-12-10 | 2015-04-08 | 马鞍山市益华液压机具有限公司 | Heat-resistant material for hydraulic spanner piston and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107893194A (en) * | 2017-10-27 | 2018-04-10 | 宁波市鄞州永佳电机工具有限公司 | A kind of high-performance spanner |
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Application publication date: 20150902 |