CN101532076A - Heat treatment quenching and tempering method - Google Patents
Heat treatment quenching and tempering method Download PDFInfo
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- CN101532076A CN101532076A CN200910097293A CN200910097293A CN101532076A CN 101532076 A CN101532076 A CN 101532076A CN 200910097293 A CN200910097293 A CN 200910097293A CN 200910097293 A CN200910097293 A CN 200910097293A CN 101532076 A CN101532076 A CN 101532076A
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Abstract
A heat treatment quenching and tempering method is disclosed, comprising the following steps of: (1) putting a cast in a heating furnace to be heated up to over AC3, followed by heat preservation; (2) after the heat preservation, taking out and putting the cast in a cooling medium for being cooled; (3) putting the cooled cast in the heating furnace once again to be heated up to the temperature between AC1 and AC3, followed by the heat preservation; (4) after the heat preservation, taking out and putting the cast in the cooling medium for being cooled; (5) putting the cooled cast back in the heating furnace to be heated up to the temperature between 500 DEG C and AC1, followed by the heat preservation; (6) after the heat preservation, taking out and putting the cast in the air for being cooled. Compared with the prior art, the invention has the advantages of low apparatus requirement, simple technological process, low technological cost, realizable batch operation, ideal resultant plastic index and high rate of finished products.
Description
Technical field:
The invention belongs to the metal heat treatmet field, particularly relate to a kind of heat treatment quenching and tempering method.
Background technology:
Foundry goods is owing to produce crystal defect in the molten steel solidification process, can not eliminate by rolling going again, therefore the relative section bar of mechanical property, especially plasticity index of foundry goods is relatively poor, and the plasticity index of stabilizing and increasing in its mechanical property just becomes a problem that needs to be resolved hurrily.
For a long time, following several processing method is roughly arranged aspect the thermal treatment of prior art medium casting after casting, is better solved in the hope of making above-mentioned problem:
1, High temperature diffusion: purpose is to make the crystallization homogenizing, eliminates the crystallization deviation to greatest extent, tries hard to change the profile of impurities mode, but because foundry goods needs 1200～1300 degrees centigrade of insulations 24 is above for a short time, therefore very high to the requirement of equipment, and much the technology cost is higher, now more do not adopt;
2, cycle heat treatment: cast product improves plasticity through repeatedly lower the temperature ladder rapid heating and cooling to reach thinning microstructure, but because of technological process complicated, the geometrical dimension, size and the heating installation that are subjected to foundry goods are limit, and are difficult to realize in actual production batch operation;
3 high temperature normalizings add modified: be to use more general processing method in the prior art, but Yin Wendu and soaking time limit, its effect of improving the foundry goods plasticity index is still undesirable;
It is modified that 4 normalizings add intercritical hardening: purpose is to improve and improve plasticity by thinning microstructure and the approach of adjusting the Impurity Distribution mode, but the technological effect fluctuation is bigger, causes yield rate lower.
Summary of the invention:
The present invention is directed to that above problem provides that a kind of equipment requirements is low, technological process is simple, the technology cost is low, can realize batch operation, obtain the heat treatment quenching and tempering method that plasticity index is more satisfactory and yield rate is high.
The present invention overcomes the above problems used technical scheme: a kind of heat treatment quenching and tempering method, and it may further comprise the steps:
1. foundry goods is put into process furnace, be heated to AC
3More than insulation, soaking time are calculated according to casting thickness and are decided, and calculation formula is: casting thickness/soaking time=1.5～2mm/min;
2. after the insulation, heat-eliminating medium is put in the foundry goods taking-up cooled off;
3. cooled foundry goods is reentered into process furnace, is heated to AC
1～AC
3Between temperature insulation, soaking time is calculated according to casting thickness and is decided, calculation formula with step 1.;
4. after the insulation, heat-eliminating medium is put in the foundry goods taking-up cooled off;
5. cooled foundry goods is reentered into process furnace, is heated to 500 ℃～AC
1Between temperature insulation, soaking time is calculated according to casting thickness and is decided, calculation formula is: casting thickness/soaking time=2.5mm/min;
6. after the insulation, foundry goods taken out to be placed in the air cool off.
After adopting above method, the present invention compared with prior art because before quenching, foundry goods at first is heated to the above postcooling of AC3 and has obtained non-equilibrium microstructure (non-equilibrium microstructure is meant that organizing of material is not perlite+ferrite); And when quenching, foundry goods is to be heated to two-phase region (two-phase region herein is meant the ferrite+austenitic area in the carbon iron balance phasor), and behind last high tempering, the plasticity index of foundry goods is better; What use in technological process simultaneously all is the general equipment of prior art.Therefore present device require low, technological process simple, the technology cost is low, can realize batch operation, to obtain plasticity index more satisfactory and yield rate is high.
Embodiment:
Below in conjunction with concrete embodiment, the present invention is described further:
Embodiment 1 (is example with the 25# foundry goods)
A kind of heat treatment quenching and tempering method, it may further comprise the steps:
1. foundry goods is put into process furnace, be heated to the temperature insulation between 900～950 ℃, soaking time is calculated according to casting thickness and is decided, calculation formula is: casting thickness/soaking time=1.8mm/min, purpose is for obtaining non-equilibrium microstructure, because foundry goods is because in the forming core characteristics of non-equilibrium microstructure austenitization and microstructure ultra-fining treatment, the interface is than increasing;
2. after the insulation, water is put in the foundry goods taking-up cooled off;
3. cooled foundry goods is reentered into process furnace, be heated to the temperature insulation between 760～780 ℃, soaking time is calculated according to casting thickness and is decided, calculation formula with step 1., purpose is in two-phase region heating because in this heat-processed the retained part ferrite, utilize impurity element in the big mechanism of α phase solubility, impurity is dissolved in the crystal, reduce the abundance of impurity, thereby improve the plasticity of foundry goods at crystal boundary;
4. after the insulation, water is put in the foundry goods taking-up cooled off;
5. cooled foundry goods is reentered into process furnace, is heated to the temperature insulation between 500～760 ℃, soaking time is calculated according to casting thickness and is decided, and calculation formula is: casting thickness/soaking time=2.5mm/min;
6. after the insulation, foundry goods taken out to be placed in the air cool off.
Foundry goods testing data after the present invention handles (quiet stretching test method adopts GB 288-1987) table:
Data from above table contrast as can be known, and the plasticity of the foundry goods after the present invention handles will be significantly better than the section bar of same material.And unit elongation≤24%, shrinking percentage≤45% of 25# foundry goods under identical strength condition that obtains of technology routinely, so plasticity is handled the foundry goods that obtains not as the present invention.
Embodiment 2 (is example with the 30# foundry goods)
A kind of heat treatment quenching and tempering method, it may further comprise the steps:
1. foundry goods is put into process furnace, be heated to the temperature insulation between 900～950 ℃, soaking time is calculated according to casting thickness and is decided, calculation formula is: casting thickness/soaking time=1.7mm/min, purpose is for obtaining non-equilibrium microstructure, because foundry goods is because in the forming core characteristics of non-equilibrium microstructure austenitization and microstructure ultra-fining treatment, the interface is than increasing;
2. after the insulation, water is put in the foundry goods taking-up cooled off;
3. cooled foundry goods is reentered into process furnace, be heated to the temperature insulation between 760～780 ℃, soaking time is calculated according to casting thickness and is decided, calculation formula with step 1., purpose is in two-phase region heating because in this heat-processed the retained part ferrite, utilize impurity element in the big mechanism of α phase solubility, impurity is dissolved in the crystal, reduce the abundance of impurity, thereby improve the plasticity of foundry goods at crystal boundary;
4. after the insulation, water is put in the foundry goods taking-up cooled off;
5. cooled foundry goods is reentered into process furnace, is heated to the temperature insulation between 500～760 ℃, soaking time is calculated according to casting thickness and is decided, and calculation formula is: casting thickness/soaking time=2.5mm/min;
6. after the insulation, foundry goods taken out to be placed in the air cool off.
Foundry goods testing data after the present invention handles (quiet stretching test method adopts GB 288-1987) table:
Data from above table contrast as can be known, and the plasticity of the foundry goods after the present invention handles will be significantly better than the section bar of same material.And unit elongation≤24%, shrinking percentage≤45% of 30# foundry goods under identical strength condition that obtains of technology routinely, so plasticity is handled the foundry goods that obtains not as the present invention.
Above embodiment only is a preferable embodiment of the present invention, the present invention also allows other and changes, and is all in the scope of claim 1, all in the protection domain of claim of the present invention.
Claims (3)
1, a kind of heat treatment quenching and tempering method, it is characterized in that: it may further comprise the steps:
1. foundry goods is put into process furnace, be heated to AC
3More than insulation, soaking time are calculated according to casting thickness and are decided, and calculation formula is: casting thickness/soaking time=1.5～2mm/min;
2. after the insulation, heat-eliminating medium is put in the foundry goods taking-up cooled off;
3. cooled foundry goods is reentered into process furnace, is heated to AC
1～AC
3Between temperature insulation, soaking time is calculated according to casting thickness and is decided, calculation formula with step 1.;
4. after the insulation, heat-eliminating medium is put in the foundry goods taking-up cooled off;
5. cooled foundry goods is reentered into process furnace, is heated to the temperature insulation between the 500 ℃～AC1, soaking time is calculated according to casting thickness and is decided, and calculation formula is: casting thickness/soaking time=2.5mm/min;
6. after the insulation, foundry goods taken out to be placed in the air cool off.
2, heat treatment quenching and tempering method according to claim 1 is characterized in that: the calculation formula of described step in 1. is: casting thickness/soaking time=1.8mm/min.
3, heat treatment quenching and tempering method according to claim 1 is characterized in that: 2. described step is water with the heat-eliminating medium of step in 3..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910097293A CN101532076A (en) | 2009-03-31 | 2009-03-31 | Heat treatment quenching and tempering method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910097293A CN101532076A (en) | 2009-03-31 | 2009-03-31 | Heat treatment quenching and tempering method |
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| CN101532076A true CN101532076A (en) | 2009-09-16 |
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|---|---|---|---|
| CN200910097293A Pending CN101532076A (en) | 2009-03-31 | 2009-03-31 | Heat treatment quenching and tempering method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892362A (en) * | 2010-04-26 | 2010-11-24 | 晋西工业集团有限责任公司 | Hardening and tempering method in pump body manufacturing |
| CN102021305A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Super-conventional performance heat treatment process for large axial forgings of carbon steel |
| CN112063816A (en) * | 2019-06-10 | 2020-12-11 | 育材堂（苏州）材料科技有限公司 | Heat treatment method of high-strength steel and product obtained thereby |
-
2009
- 2009-03-31 CN CN200910097293A patent/CN101532076A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892362A (en) * | 2010-04-26 | 2010-11-24 | 晋西工业集团有限责任公司 | Hardening and tempering method in pump body manufacturing |
| CN102021305A (en) * | 2010-12-07 | 2011-04-20 | 无锡宏达重型锻压有限公司 | Super-conventional performance heat treatment process for large axial forgings of carbon steel |
| CN112063816A (en) * | 2019-06-10 | 2020-12-11 | 育材堂（苏州）材料科技有限公司 | Heat treatment method of high-strength steel and product obtained thereby |
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Open date: 20090916 |