CN102634645A - Surface protection method for thermally treating steel sample - Google Patents
Surface protection method for thermally treating steel sample Download PDFInfo
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- CN102634645A CN102634645A CN2012101435868A CN201210143586A CN102634645A CN 102634645 A CN102634645 A CN 102634645A CN 2012101435868 A CN2012101435868 A CN 2012101435868A CN 201210143586 A CN201210143586 A CN 201210143586A CN 102634645 A CN102634645 A CN 102634645A
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Abstract
The invention discloses a surface protection method for thermally treating a steel sample. The surface protection method comprises the following steps of: placing silicon dioxide powder into a container, wherein the volume of the silicon dioxide powder is 10%-40% of the total volume of the container; putting in a sample, and then putting in silicon dioxide powder of which the volume is 55%-85% of the total volume, and embedding the sample; finally putting in powdered graphite of which the volume is 5%-35% of the total volume, covering a container lid and sealing the container by using high-temperature resisting inorganic glue; and after curing the high-temperature glue, putting the container into a thermal treatment furnace for performing thermal treatment. After the steel sample is thermally treated according to the surface protection method provided by the invention, the surface is scale-free and decarburation-free. Compared with a traditional thermal treatment protection method, the surface protection method has the advantages of effective protection for sample surface, convenience in operation, low cost, energy conservation, environmental friendliness, and the like.
Description
Technical field
The invention belongs to the metal heat treatmet field, method for protecting surface during particularly a kind of steel sample thermal treatment.
Background technology
In the steel products course of processing, usually use various thermal treatments, for example: in the fastening piece courses of processing such as bolt, nut; For the ease of cold-heading, nodularization or softening annealing are carried out in 700～780 ℃ of insulations 4～8 hours of being everlasting; Reduce the intensity and the hardness of original wire rod; Improve plasticity, thereby reduce the consume of cold-heading mould, avoid the workpiece cracking; In the cold-drawn of wire rod, thin plate, cold-rolled process,,, make it that recrystallization annealing take place with its 50～150 ℃ of insulation for some time below austenitizing temperature in order to eliminate the work hardening phenomenon; For some alloy-steel castings, in order to improve the homogeneity of chemical ingredients, be everlasting under its prerequisite that does not melt, under high as far as possible temperature, be incubated the long period, adopt homogenizing annealing to make the alloying element even diffused.The temperature that thermal treatment needs is generally higher, and about 200 ℃～1200 ℃ are not waited, and soaking time is longer, several hours to tens of hours approximately.Steel are in Conventional Heat Treatment, and at high temperature insulation for a long time usually causes the material surface decarburization, generates thicker oxide debris, causes workpiece size to reduce, and surface structure changes, degradation.
In order to protect the surface of workpiece when the thermal treatment, prevent decarburization and oxidation, traditional method is to adopt vacuum heat treatment furnace or atmosphere protection stove.Vacuum heat treatment furnace need be equipped with the expensive vacuum system of a cover, and the operation and maintenance cost is very high; And the atmosphere protection stove need consume a large amount of shielding gas, is prone to cause environmental pollution.
Summary of the invention
The object of the invention is to provide a kind of method on protection surface when with the Conventional Heat Treatment stove steel samples being heat-treated, and not generate oxide debris, no decarburization, surface quality good for sample when using present method to heat-treat.
For realizing the foregoing invention purpose, the present invention has adopted following technical scheme:
Method for protecting surface during a kind of steel sample thermal treatment may further comprise the steps:
1) puts into SiO 2 powder and the compacting that accounts for container cubic capacity 10%～40%, put into sample then;
2) put into SiO 2 powder and the compacting that accounts for container cubic capacity 55%～85%, with sample embedding, silicon dioxide thickness >=5mm;
3) put into powdered graphite and the compacting that accounts for container cubic capacity 5%～35%, the covered container lid seals with the high temperature inorganic glue;
4) treat that the high temperature inorganic glue is solidified after, container is put into heat treatment furnace heat-treats.
To above method, process step and subsidiary material are specified as follows:
1) at first to put into the SiO 2 powder that accounts for volume about 10～40% in the container, put into sample in the middle then, then put into the SiO 2 powder of TV about 55～85% again,, put into the powdered graphite of TV about 5～35% at last the sample embedding.Select for use the reason of SiO 2 powder embedding sample to be: its stable in properties is difficult for reacting with sample surfaces.Material cheaply enriches within easy reach simultaneously.Put into a certain amount of SiO 2 powder earlier at container, can prevent that sample from directly contacting with container bottom, causes the inequality of being heated.Add a spot of Graphite Powder 99 at last, react with minor amounts of oxygen remaining in the container, the protection sample surfaces is not oxidized.
2) forbid Graphite Powder 99 to contact with sample, both are separated by 5 millimeters at least, prevent sample surfaces carburizing under the high temperature.
3) select the common earthenware porcelain receptacle that lid is arranged for use, need between container and the container cover with the special-purpose refractory inorganic adhesive sealing of pottery.After treating that high-temp glue need be cured, just can put into heat treatment furnace.Program curing is that room temperature keeps 12h～24h, or 100～200 ℃ of insulation 2h～6h, and the high-temp glue heat resisting temperature is greater than 1700 ℃.Use the high-temp glue sealed vessel, guarantee that air does not get into, stop the oxygen source.Just allow to put into stove after high-temp glue must be solidified, otherwise high-temp glue can bond or ftracture insecure, cause the sealing failure.Top temperature when the high-temp glue heat resisting temperature must be greater than thermal treatment, otherwise high-temp glue melts in stove, also can cause the sealing failure.Select for use heat resisting temperature greater than 1700 ℃ high-temp glue, be higher than the steel products thermal treatment temp far away, so high-temp glue can not melt.
4) granularity of SiO 2 powder and powdered graphite all is about 100 μ m～500 μ m, and powder needs compacting.If the granularity of SiO 2 powder and powdered graphite is excessive, loosen easily, be difficult for compacting, internal porosity is more, and residual oxygen is also more, is prone to make sample surfaces generation oxidation.
Compared with prior art, beneficial effect of the present invention is, only uses common material and heat treatment furnace; Just can when thermal treatment, protect the steel samples surface, method is simple, draws materials conveniently; Easy handling, the effect of surface protection is remarkable, especially is suitable for the thermal treatment of small sample.
Embodiment
With embodiment the present invention is done further elaboration below, but these embodiment there is any restriction to the present invention absolutely not.Those skilled in the art will drop in the scope of claims any change of being done in the present invention's enforcement under the enlightenment of this specification sheets.
Embodiment 1
With present method alloy The cold heading steel SCM435 is carried out surface protection when the Spheroidizing Annealing
SCM435 is used to make 12.9 grade high-strength fasteners, need carry out Spheroidizing Annealing to wire rod in its course of processing, reduces the intensity of wire rod, improves plasticity, is beneficial to cold-heading molding.Get the SCM435 hot rolling attitude wire rod of specification φ 14mm, utilize said method of the present invention, when it is annealed, the surface is protected, specific as follows:
(1) 3 sections of SCM435 wire rods getting long 28mm and volume are 1 in the conventional ceramic container of 100ml.Earlier in container, put into about 25ml SiO 2 powder and compacting, granularity is about 350～450 μ m; Put into sample in the middle then, then put into SiO 2 powder and the compacting of about 70ml, sample is imbedded, guarantee that sample is in the container middle; Put into powdered graphite and the compacting of about 5ml at last, granularity is 300～400 μ m, and the distance of 15mm is arranged between sample and the Graphite Powder 99 approximately, builds container cover.
(2) use the special-purpose refractory inorganic adhesive of pottery with container cover and container sealing, then sample is put into the room, be allowed to condition at lasting 20h under the room temperature.The heat resisting temperature of refractory inorganic adhesive is 1730 ℃.
(3) entire container is put into process furnace, process furnace is common box-type furnace, no atmosphere protection, no vacuum apparatus.
After the off-test, take out sample, cutting obtains its xsect sample, prepares metallographic sample according to the metallographic preparation procedure, is used to observe surface structure and scale thickness, and edge tissues does not have decarburization; Scale thickness 25.85 μ m, hot rolling attitude scale thickness 20～35 μ m, both thickness is approaching, and explaining does not have to generate thicker oxide debris.
Claims (4)
1. method for protecting surface during a steel sample thermal treatment is characterized in that, may further comprise the steps:
1) puts into SiO 2 powder and the compacting that accounts for container cubic capacity 10%～40%, put into sample then;
2) put into SiO 2 powder and the compacting that accounts for container cubic capacity 55%～85%, with sample embedding, silicon dioxide thickness >=5mm;
3) put into powdered graphite and the compacting that accounts for container cubic capacity 5%～35%, the covered container lid seals with the high temperature inorganic glue;
4) treat that the high temperature inorganic glue is solidified after, container is put into heat treatment furnace heat-treats.
2. method for protecting surface during steel sample thermal treatment according to claim 1 is characterized in that: in step 1) or step 2) or step 3) described in powder size be 100 μ m～500 μ m.
3. method for protecting surface during steel sample thermal treatment according to claim 1 is characterized in that: step
3) described high temperature inorganic glue heat resisting temperature is greater than 1700 ℃.
4. method for protecting surface during steel sample thermal treatment according to claim 1 is characterized in that: described high temperature inorganic glue is cured as and continues 12h～24h under the room temperature, or 100～200 ℃ of insulation 2h～6h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210143586.8A CN102634645B (en) | 2012-05-10 | 2012-05-10 | Surface protection method for thermally treating steel sample |
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| CN201210143586.8A CN102634645B (en) | 2012-05-10 | 2012-05-10 | Surface protection method for thermally treating steel sample |
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| CN102634645A true CN102634645A (en) | 2012-08-15 |
| CN102634645B CN102634645B (en) | 2014-01-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092897A (en) * | 2015-08-12 | 2015-11-25 | 北京泰瑞特检测技术服务有限责任公司 | Method of processing powder sample for argon ion beam cutting |
| CN107287398A (en) * | 2017-07-20 | 2017-10-24 | 首钢集团有限公司 | A kind of non-oxidation heat treatment for being used to protect iron scale |
| CN107964577A (en) * | 2017-11-13 | 2018-04-27 | 哈尔滨汽轮机厂有限责任公司 | A kind of method that steel material part scale-free heating is carried out using solid carburizer |
| CN111906142A (en) * | 2020-06-24 | 2020-11-10 | 浙江博星工贸有限公司 | Process for controlling mechanical property of cold-rolled stainless steel strip |
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| US3959028A (en) * | 1972-11-20 | 1976-05-25 | The International Nickel Company, Inc. | Process of working metals coated with a protective coating |
| CN101693791A (en) * | 2009-11-02 | 2010-04-14 | 北京科技大学 | Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof |
| CN101736138A (en) * | 2009-12-23 | 2010-06-16 | 北京科技大学 | Antioxidant coating applied to high-temperature alloy heat treatment |
| CN101993983A (en) * | 2009-08-31 | 2011-03-30 | 山东泰山钢铁集团有限公司 | Annealing method for improving machinability of martensitic stainless steel cast |
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2012
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| US3959028A (en) * | 1972-11-20 | 1976-05-25 | The International Nickel Company, Inc. | Process of working metals coated with a protective coating |
| CN101993983A (en) * | 2009-08-31 | 2011-03-30 | 山东泰山钢铁集团有限公司 | Annealing method for improving machinability of martensitic stainless steel cast |
| CN101693791A (en) * | 2009-11-02 | 2010-04-14 | 北京科技大学 | Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092897A (en) * | 2015-08-12 | 2015-11-25 | 北京泰瑞特检测技术服务有限责任公司 | Method of processing powder sample for argon ion beam cutting |
| CN105092897B (en) * | 2015-08-12 | 2017-12-26 | 北京泰瑞特检测技术服务有限责任公司 | A kind of processing method of powder sample for ar-ion beam cutting |
| CN107287398A (en) * | 2017-07-20 | 2017-10-24 | 首钢集团有限公司 | A kind of non-oxidation heat treatment for being used to protect iron scale |
| CN107964577A (en) * | 2017-11-13 | 2018-04-27 | 哈尔滨汽轮机厂有限责任公司 | A kind of method that steel material part scale-free heating is carried out using solid carburizer |
| CN111906142A (en) * | 2020-06-24 | 2020-11-10 | 浙江博星工贸有限公司 | Process for controlling mechanical property of cold-rolled stainless steel strip |
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| CN102634645B (en) | 2014-01-29 |
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Denomination of invention: A surface protection method for steel sample during heat treatment Effective date of registration: 20210901 Granted publication date: 20140129 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Registration number: Y2021980008707 |
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