CN100588723C - Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof - Google Patents
Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof Download PDFInfo
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- CN100588723C CN100588723C CN200710068744A CN200710068744A CN100588723C CN 100588723 C CN100588723 C CN 100588723C CN 200710068744 A CN200710068744 A CN 200710068744A CN 200710068744 A CN200710068744 A CN 200710068744A CN 100588723 C CN100588723 C CN 100588723C
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Abstract
A surface decarburation technology in the process of metal strip plumbum quenching-tempering and apparatus are provided. The process comprises humidifying the protective gas to make the protective gascontain a certain vapor in the process of metal strip continuous quenching and heating, doing an oxidation reaction of oxygen in the hot vapor and carbon in the metal strip surface layer to obtain the objective of metal strip surface decarburation and the ecarburation layer about 5 mum thickness on the metal strip surface and improve the metal strip plastic nature obviously. Meanwhile, there hasno distinct oxidation on the metal strip surface. The metal strip by decarburation treatment will not breakdown or appears crack by 180 DEG bending so as to effectively improve the rate of finished products and quality of the metal strip.
Description
Technical field
The present invention relates to steel band heat treatment table emaciated face carbon technique, particularly about the method and the equipment thereof of the surface decarburization in the steel belt lead-bath quenching and backfire process.
Background technology
Usually need do to quench as the high quality steel of cutter or band saw or tool steel and add tempering and handle, because the common consumption of this class steel is big, must adopting quenching to add the tempered production line again, carry out the thermal treatment of successive steel band.The thermal treatment process of comparative maturity is exactly: the lead bath quenching+tempering process under the protective atmosphere, and to obtain high strength, high rigidity, beautiful outward appearance and little distortion.Yet, because this class steel contains higher carbon equivalent, quench treatment rear surface hardness is very high, when steel band is carried out local bending, crackle appears easily, even fracture, for example, the occasion that is used for the footwear cutter require the steel band after the thermal treatment can bend to certain shape, so the hardness of steel strip surface just can not be too high.Common terms of settlement is carried out decarburization to steel strip surface exactly.
Summary of the invention
Basic ideas of the present invention are; lead to humidifier of increase in the pipeline of quenching heating furnace at shielding gas; be sprayed onto the steel band two sides by the jet pipe that is arranged on heated steel band upper and lower surface after will having the protection gas reheat of water vapour; blended water vapour makes protection gas have weak oxide in the shielding gas; under the condition of high temperature; the a small amount of Sauerstoffatom that contains in the protection gas combines with the carbon in the steel strip surface layer; forming CO and protected air-flow takes away; thereby realize decarburization purpose to steel strip surface; because oxygen level is less in the atmosphere; the time that steel band in moving is exposed in this mixed gas is also shorter, so the oxidation that can not produce tangible steel strip surface decarburization the time.
Steel belt lead-bath quenching and backfire product line decarburization equipment, it comprises shielding gas access tube, quenching process furnace, be located at the mixed gas reheater in the quenching process furnace, the overheated mixed gas pipeline that is connected with reheater sprays comb with the mixed gas that is located at operation steel band upper and lower surface, it is characterized in that being provided with the humidifier of shielding gas being sneaked into water vapour between shielding gas access tube and mixed gas reheater; Described humidifier is located at the electric heater in the cistern by water inlet pipe, inlet pipe, cistern, escape pipe, and the air pressure lid that is located between electric heater and the inlet pipe is formed.
The method of steel belt lead-bath quenching and backfire product line steel band decarburization may further comprise the steps:
Input produces in the steam humidifier of water vapour and mixes with water vapour as shielding gas for a, the nitrogen that will contain 75% hydrogen and 25%;
B, the above-mentioned shielding gas that contains water vapour sent into be heated to 860～900 ℃ in the reheater;
C, the above-mentioned hybrid protection gas that is reheated is ejected into the upper and lower surface that translational speed is 1～2 meter/minute mobile steel band with the flow of 800～1500 milliliters of per minutes by spraying comb;
D, with the steel band of coming out of the stove keep dry, room temperature cooling.
Ultimate principle of the present invention can illustrate by following chemical equation:
Protection gas at first decomposes 2NH by ammonia
3→ 3H
2+ N
2The 75%H that forms
2+ 25%N
2Form,, contained a certain amount of water vapour: H in the protection gas through after the humidification
2O
The component concentration of hybrid protection gas is (75%H
2+ 25%N
2)
1-x(H
2O) x X=0.1～0.2 wherein
Carbon generation redox reaction in water vapour and the steel strip surface layer restores carbon atom:
H
2O+C → H
2+ CO or: 2H
2O+C → 2H
2+ CO
2
The CO or the CO that form
2Protected mixed airflow is constantly taken away, thereby forms the carbon rejection process of successive steel strip surface layer.The speed of decarburization depends on H
2O, H
2, CO, CO
2Wait the dividing potential drop of each gas.During design, make that usually the flow direction of furnace gas is opposite with the direction of steel band operation, be easy to CO or CO that decarburizing reaction is formed
2Gas is discharged, and above-mentioned reaction is constantly carried out to right-hand decarburizing reaction direction.
The invention has the beneficial effects as follows: the decarburization on steel surface must be carried out in high temperature oxidation stability atmosphere, yet steel strip surface is easy to oxidation under the hot conditions.The present invention adopts the method that the ammonia decomposing protection+the heat steam decarburization combines, and has obtained the Decarburized layer of about 5 micron thickness of steel strip surface, and tangible oxidative phenomena does not appear in steel strip surface simultaneously.In steel band continuous quenching heat-processed, utilize oxygen in the heat steam and the carbon in the steel strip surface layer to play oxidizing reaction, reach the purpose of steel strip surface decarburization.This technology is applied to steel belt lead-bath quenching and backfire product line, has realized the target of steel strip surface decarburization, has significantly improved steel band plasticity.Make the surface hardness of steel band reduce, toughness strengthens, can carry out the bending at 180 degree angles and fracture does not take place or crackle occurs through the steel band of this Technology decarburization, effectively improve and resemble yield rate and the quality product of footwear cutter when needing crooked tool steel to make like this.
Description of drawings
Fig. 1 is a steel band quenching carbon rejection process synoptic diagram.
Fig. 2 is a steam humidifier structural representation.
Embodiment
Below in conjunction with Fig. 1, further describe the primary process of content of the present invention and decarburization.Adopt ammonia to decompose in the quenching heat-processed, ammonia is led into access tube 1,, become the gas mixture of 75% hydrogen and 25% nitrogen, so protective atmosphere is by 75%H after being higher than 200 degree because ammonia just begins to decompose as shielding gas
2+ 25%N
2Form.In the protection air pipe, increase a humidifier; humidifier is a device that produces water vapour; as shown in Figure 2; by water inlet pipe 25, inlet pipe 21, cistern 22, escape pipe 27; be located at the electric heater 24 in the cistern 22; and the air pressure lid 26 that is located between electric heater 24 and the inlet pipe 21 is formed; containing the gas of protecting gas is mixed with heat steam by the air pressure lid 26 times that inlet pipe 21 enters in the cistern 22; make shielding gas flow through humidifier, contain a certain amount of water vapour thereby make in the protection gas.By Flow-rate adjustment to inlet pipe 21; control shielding gas and water vapour blending ratio; the gas mixture reheat of humidifier will be flowed out; to strengthen the oxidation activity of gas; overheated gas mixture flows through in two row's jet pipes of pipeline 4 feeding steel band upper and lower surfaces settings; the shielding gas that will be mixed with superheated vapo(u)r by jet pipe 5 is injected on the steel band upper and lower surface equably, goes out the carbon atom of steel strip surface by the hydrogen reduction in the steam, thereby realizes the processing of steel strip surface pull-up carbon.
When quenching heating the steel strip surface layer being carried out decarburization is to improve steel band plasticity, avoids steel band the effective ways of crackle even fracture to occur when follow-up bending forming.Adopting the thermal treatment of steel tape lead-bath quenching and backfire is the basic skills of the high-level efficiency modulation treatment of some tool steel, spring steel etc., be widely used in many cutter industries, for example: the footwear cutter of the scudding knife of all size, various series and specification etc., wherein the footwear cutter carries out various bending formings according to the different size needs to cutter, if do not carry out the decarburization of steel strip surface layer, therefore steel band can ftracture even rupture when bending forming, carries out the upper layer decarburization technological process that is absolutely necessary simultaneously in lead bath quenching.Below be two specific embodiments of the present invention.
Be used to make 2 mm thick of footwear cutter, the 30CrMo steel band of 24 mm wides, carrying out continuous carbonization treatment on the lead-bath quenching and backfire heat-treatment production line continuously, steel band moves with the speed of 1.5～2.0 meters of per minutes.The component concentration of hybrid protection gas is (75%H
2+ 25%N
2)
0.9(H
2O)
0.1The protection gas of being sneaked into water vapour is further heated 860～880 ℃ in pipeline, the flow with 800 milliliters of per minutes sprays to the steel band upper and lower surface by jet pipe then, the decarburization time of mobile steel strip surface 2～3 minutes.Through the steel band that above decarbonization process is handled, about 5 micron thickness of surface decarburization layer, decarburized amount about 40%, the hardness on steel band top layer is starkly lower than the steel band of not decarburization, plasticity obviously improves, and crooked experiment shows that fracture or cracking do not take place in the doubling of steel band being carried out 180 degree.
To be used to make 4 mm thick of footwear cutter, the 40CrMo steel band of 80 mm wides equally, carrying out continuous carbonization treatment on the lead-bath quenching and backfire heat-treatment production line continuously, steel band moves with the speed of 1.0～1.5 meters of per minutes.The component concentration of hybrid protection gas is (75%H
2+ 25%N
2)
0.8(H
2O)
0.2The protection gas of being sneaked into water vapour is heated to 880～900 degree in pipeline, and sprays to the steel band upper and lower surface by jet pipe, about 1～2 minute of the decarburization time of mobile steel strip surface with 1000 milliliters of flows of per minute.Through the steel band that above decarbonization process is handled, about 4～5 micron thickness of surface decarburization layer, decarburized amount is about 30～40%, and the plasticity on steel band top layer obviously improves, and fracture or cracking do not take place in the doublings of steel band being carried out 180 degree.
Claims (5)
1, steel belt lead-bath quenching and backfire product line decarburization equipment, it comprises shielding gas access tube (1), quenching process furnace (7), be located at the mixed gas reheater (3) in the quenching process furnace (7), overheated mixed gas pipeline (4) that is connected with reheater and the mixed gas that is located at operation steel band (6) upper and lower surface spray comb (5), it is characterized in that being provided with between shielding gas access tube (1) and mixed gas reheater (3) humidifier (2) of shielding gas being sneaked into water vapour; Described humidifier (2) is located at the electric heater (24) in the cistern (22) by water inlet pipe (25), inlet pipe (21), cistern (22), escape pipe (27), and the air pressure lid (26) that is located between electric heater (24) and the inlet pipe (21) is formed.
2, the steel strip surface decarbonization method of steel belt lead-bath quenching and backfire product line decarburization equipment according to claim 1 is characterized in that may further comprise the steps:
A, will contain 75% H
2With 25% N
2As mixing with water vapour in the shielding gas input humidifier (2);
B, the above-mentioned shielding gas that contains water vapour sent in the reheater (3) be heated to 860～900 ℃;
C, above-mentioned heated hybrid protection gas is ejected into the upper and lower surface of the mobile steel band of 1～2 meter/minute of translational speed with 800～1000 ml/min flows by spraying comb (5);
D, with the steel band of coming out of the stove keep dry, room temperature cooling.
3, the steel strip surface decarbonization method of steel belt lead-bath quenching and backfire product line decarburization equipment according to claim 2, the component concentration that it is characterized in that hybrid protection gas is (75%H
2+ 25%N
2)
1-X(H
2O)
X, X=0.1～0.2 wherein.
4, the steel strip surface decarbonization method of steel belt lead-bath quenching and backfire product line decarburization equipment according to claim 2, the component concentration that it is characterized in that hybrid protection gas is (75%H
2+ 25%N
2)
0.9(H
2O)
0.1
5, the steel strip surface decarbonization method of steel belt lead-bath quenching and backfire product line decarburization equipment according to claim 2, the component concentration that it is characterized in that hybrid protection gas is (75%H
2+ 25%N
2)
0.8(H
2O)
0.2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710068744A CN100588723C (en) | 2007-05-18 | 2007-05-18 | Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof |
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|---|---|---|---|
| CN200710068744A CN100588723C (en) | 2007-05-18 | 2007-05-18 | Steel belt lead-bath quenching and backfire product line decarburization technique and device thereof |
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|---|---|
| CN101054620A CN101054620A (en) | 2007-10-17 |
| CN100588723C true CN100588723C (en) | 2010-02-10 |
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| CN101418367B (en) * | 2007-10-25 | 2010-11-17 | 新万鑫（福建）精密薄板有限公司 | Carbon elimination process for non-oriented silicon steel production |
| TWI450976B (en) * | 2012-01-02 | 2014-09-01 | China Steel Corp | Induction heat treatment method of spring wire rod |
| TW201418476A (en) * | 2012-11-01 | 2014-05-16 | Metal Ind Res & Dev Ct | Furnace gas generation apparatus used in small heat treatment furnace |
| CN103242043B (en) * | 2013-05-24 | 2014-10-15 | 中国科学院上海光学精密机械研究所 | Synthetic method of aluminum oxynitride powder |
| CN110079657B (en) * | 2019-05-17 | 2024-01-26 | 东台艺新金属材料有限公司 | Gas mixing and feeding device in saw blade tempering furnace |
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