CN109097773A - A kind of heat treatment method improving glazing hardness of steel - Google Patents
A kind of heat treatment method improving glazing hardness of steel Download PDFInfo
- Publication number
- CN109097773A CN109097773A CN201811017135.3A CN201811017135A CN109097773A CN 109097773 A CN109097773 A CN 109097773A CN 201811017135 A CN201811017135 A CN 201811017135A CN 109097773 A CN109097773 A CN 109097773A
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- China
- Prior art keywords
- glazing
- steel
- heat treatment
- hardness
- cooled
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D13/00—After-treatment of the enamelled articles
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
- C23D5/00—Coating with enamels or vitreous layers
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
Abstract
The invention discloses a kind of heat treatment methods for improving glazing hardness of steel, glazing to be processed are placed in lye after 10~15min of cleaning with steel, then be placed in 2~3min of cleaning in acid solution；The uniform daub of glazing steel surface after pickling；Glazing after daub is heated to 760~870 DEG C with steel and carries out 5~10min of heat preservation heat treatment；Glazing after heat treatment is placed in air with steel to be cooled to room temperature；It is cooled to the glazing of room temperature steel surface uniform daub again, is then heated to 400~600 DEG C of 5~10min of progress tempering；Glazing after tempering is placed in air with steel to be cooled to room temperature to obtain the final product.The heat treatment method of glazing of the present invention hardness of steel both can guarantee that glazing obtained the good glazing layer in surface after glazing sintering with steel, and yield strength is obviously improved after tempering, the glazing for being sintered non-tempering compared to glazing improves 30%~40% with hardness of steel.
Description
Technical field
The present invention relates to a kind of heat treatment methods for improving glazing hardness of steel, belong to field of material processing.
Background technique
Glazing steel be by specialty inorganic vitreous material by high-temperature fusion coagulate on matrix steel plate (glazing steel) and with
Secured chemical bonds are generated between the steel plate and a kind of manufactured composite material haveing excellent performance.Glazing steel both maintains steel plate
Substrate is tough and shock proof characteristic, it may have the strong acid and alkali-resistance of enamel layer, it is corrosion-resistant, do not burn, be easy to clean, pollution-free and nothing
The features such as radiation.Therefore, glazing steel is widely used in the fields such as light industry, household electrical appliances, metallurgy, chemical industry and building.Wherein, glazing is used
Steel generallys use mild steel steel plate, and phosphorus content is general≤0.08wt.%.
For producing the glazing steel of water heater liner, required steel plate that there is good formability, both to meet liner envelope
Head it is stamping, have higher intensity again, with guarantee liner be able to bear pressure be 1.0~1.2MPa pressure test and
High pressure water cycle test, while also there is good weldability, make commissure and heat affected area in application of slip performance and resistance to pressure energy
It is unlikely to become weak link in terms of power.However, glazing is with steel in the thermal cycle (760~900 for carrying out glass enamel sintering
DEG C) in treatment process, yield strength can decrease.
It is closely related between the microscopic structure of glazing steel and its performance, microscopic structure generally comprises ferrite, pearly-lustre
Body, carbide and non-metallic inclusion etc., the glazing haveing excellent performance is less with the content of steel requirement pearlite, and existing few
Amount pearlite should be evenly distributed in around ferrite, and reduction is endangered in enamel firing to caused by enamel；It is ferritic simultaneously
Crystal particle scale also should be tiny as far as possible, reduces the impurity content of grain boundaries on unit area.However, glazing steel is sintered in glazing
Cheng Zhong generates rich carbon massive phase since Carbon diffusion is insufficient easily in its tissue, weakens solution strengthening and dislocation strengthening
Effect, reduces the yield strength of steel plate.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide one kind to significantly improve glazing
With the heat treatment method of hardness of steel.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is as follows:
A kind of heat treatment method improving glazing hardness of steel, includes the following steps:
Step 1: glazing to be processed is placed in lye after 10~15min of cleaning with steel, then is placed in acid solution and cleans 2
~3min；
Step 2: the uniform daub of glazing steel surface after step 1 pickling；
Step 3: by the glazing after step 2 daub with steel be heated to 760~870 DEG C carry out heat preservation heat treatment 5~
10min；
Step 4: the glazing after step 3 is heat-treated is placed in air with steel to be cooled to room temperature；
Step 5: being cooled to the glazing of room temperature steel surface uniform daub again in step 4, it is then heated to 400~
600 DEG C of 5~10min of progress tempering；
Glazing after step 5 tempering is placed in air with steel and is cooled to room temperature by step 6.
In step 1, the lye is the mixed liquor that sodium hydroxide solution and sodium carbonate liquor are mixed according to mass ratio 8:5,
Wherein, the concentration of the sodium hydroxide solution is 60~90g/L, and the concentration of the sodium carbonate liquor is 40~60g/L；It is preferred that
The sodium hydroxide solution of 80g/L and the sodium carbonate liquor of 50g/L, the effect of alkali cleaning are the lubricating oil and label for removing surface of steel plate
The dirts such as paint.
The acid solution is the hydrochloric acid solution of 20~24wt% of concentration, and the effect of pickling is to remove the oxide skin of steel surface,
Time cannot be too long, in order to avoid the Fe in glazing steel and sour overreaction.
In step 2 and step 5, the coating is the anti-oxidant painting of century No.1 purchased from Huangyan, Zhejiang sapecial coating factory
The coating layer thickness of material, smearing is 0.16~0.20mm, so that glazing is heated evenly with each region of steel in heat treatment process.
In step 3, the heating rate of heating is controlled in 1~1.5 DEG C/s, preferably 1.25 DEG C/s.
In step 4,400 DEG C first are cooled to the rate of temperature fall of 5~6 DEG C/s, then cooled to room temperature.
In step 5, the heating rate of heating is controlled in 1~1.5 DEG C/s, preferably 1.25 DEG C/s；The purpose of tempering is to make group
Rich carbon massive phase in knitting is decomposed, the atoms such as C, N can be sufficiently diffused to it is transgranular to form KESHI gas mass pinning dislocation,
The effect of solution strengthening and dislocation strengthening is enhanced, to obtain higher yield strength.
In step 6, the glazing after tempering is directly placed at cooled to room temperature in air with steel.
The utility model has the advantages that
The heat treatment method of glazing of the present invention hardness of steel both can guarantee glazing, and with steel, to obtain surface excellent after glazing sintering
The glazing layer of matter, and yield strength is obviously improved after tempering, it is strong compared to the glazing steel that glazing is sintered non-tempering
Degree improves 30~40%.
Detailed description of the invention
The present invention is done with reference to the accompanying drawings and detailed description and is further illustrated, of the invention is above-mentioned
And/or otherwise advantage will become apparent.
Microscopic structure when Fig. 1 is 1 glazing steel rolling state of embodiment；
Fig. 2 is 1 glazing steel of embodiment in the sintered microscopic structure of glazing；
Fig. 3 is the microscopic structure after 1 glazing steel tempering of embodiment；
Fig. 4 be 1 glazing steel rolling state of embodiment, glazing sintering after and tempering after stress-strain diagram.
Specific embodiment
According to following embodiments, the present invention may be better understood.
Structure depicted in Figure of description, ratio, size etc., only to cooperate the revealed content of specification, with
Understand for those skilled in the art and read, be not intended to limit the invention enforceable qualifications, therefore does not have technically
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size can be generated not influencing the present invention
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.
In following embodiment, the glazing steel of use is by following mass percent at being grouped as: C:0.05~0.10%；
Mn:1.0~1.50%；P≤0.07%；S:0.001~0.025%；Si:0.03~0.05%；Cu≤0.2%；Ni:0.02~
0.04%；Cr:0.03~0.06%；Mo≤0.03%；Sn:0.003~0.01%；Al:0.02~0.045%；V:0.005~
0.012%；Nb≤0.01%；N:0.005~0.013%；Ti:0.015~0.03%；B≤0.005%；Ca≤0.005%；
Surplus is Fe and other inevitable impurity.
Embodiment 1
Step 1: glazing to be processed is placed in the mixing of 60g/L sodium hydroxide solution and 40g/L sodium carbonate liquor with steel
The profit of cleaning 10~15min removal surface of steel plate in liquid (sodium hydroxide solution and sodium carbonate liquor are mixed according to mass ratio 8:5)
The dirts such as lubricating oil and label paint, are then placed in the hydrochloric acid solution of 20wt% again and clean the oxygen of 2~3min removal steel surface
Change skin；
Step 2: the uniform daub of glazing steel surface after step 1 pickling, coating with a thickness of 0.16~
0.20mm；
Step 3: it is laggard that the glazing after the uniform daub of step 2 with steel is heated to 760 with the heating rate of 1 DEG C/s
Row heat preservation heat treatment 10min；
Step 4: the glazing after step 3 is heat-treated is cooling using air-cooled mode with steel, first with the rate of temperature fall of 5 DEG C/s
400 DEG C are cooled to, then cooled to room temperature；
Step 5: being cooled to the glazing of room temperature with carrying out tempering after steel surface again uniform daub in step 4,
Wherein, coating with a thickness of 0.16~0.20mm, 400 DEG C of progress tempering 10min are heated to the heating rate of 1 DEG C/s；
Step 6: glazing after step 5 is tempered is placed in air cooled to room temperature with steel to obtain the final product.
The glazing of embodiment 1 is σ with its rolling state yield strength of steel0.2r: 332MPa；After glazing sintering heat treatment (the
When four the end of the step), the good glazing layer in surface is obtained, glazing steel is under with a thickness of 1.1~1.4mm, yield strength σ0.2e:
285Mpa has dropped 47MPa；After tempered processing, compared with the sintered glazing steel of glazing, yield strength σ0.2t:
382MPa compares σ0.2eImprove 97MPa.
From can be seen that glazing steel in Fig. 1, Fig. 2 and Fig. 3 after 760 DEG C of heat treatment, occurs C, Mn segregation in tissue
The second phase, after tempering, massive phase in tissue all decomposes substantially is changed into pearlite, that is, the microscopic structure after being tempered is iron element
Body and the pearlite being distributed at ferrite grain boundaries on a small quantity.Fig. 4 be 1 glazing steel rolling state of embodiment, glazing sintering after and
Stress-strain diagram after tempering.Figure 4, it is seen that the yield strength of glazing steel significantly drops after glazing is sintered
It is low, and after tempering, 97MPa is improved compared with the sintered yield strength of glazing.
Embodiment 2
Step 1: glazing to be processed is placed in the mixing of 80g/L sodium hydroxide solution and 50g/L sodium carbonate liquor with steel
The profit of cleaning 10~15min removal surface of steel plate in liquid (sodium hydroxide solution and sodium carbonate liquor are mixed according to mass ratio 8:5)
Then the dirts such as lubricating oil and label paint are placed in 2~3min of middle cleaning removal steel surface in the hydrochloric acid solution of 22wt% again
Oxide skin；
Step 2: the uniform daub of glazing steel surface after step 1 pickling, coating with a thickness of 0.16~
0.20mm；
Step 3: the glazing after the uniform daub of step 2 is heated to 800 with steel with the heating rate of 1.25 DEG C/s
Heat preservation hot is carried out after DEG C handles 8min；
Step 4: the glazing after step 3 is heat-treated is cooling using air-cooled mode with steel, first with the rate of temperature fall of 6 DEG C/s
400 DEG C are cooled to, then cooled to room temperature；
Step 5: being cooled to the glazing of room temperature with carrying out tempering after steel surface again uniform daub in step 4,
Wherein, coating with a thickness of 0.16~0.20mm, 500 DEG C of progress temperings are heated to the heating rate of 1.25 DEG C/s
8min；
Step 6: glazing after step 5 is tempered is placed in air cooled to room temperature with steel to obtain the final product.
The glazing of embodiment 2 is σ with its rolling state yield strength of steel0.2r: 335MPa；After glazing sintering heat treatment (the
When four the end of the step), the good glazing layer in surface is obtained, glazing steel is under with a thickness of 1.1~1.4mm, yield strength σ0.2e:
280Mpa has dropped 49MPa；After tempered processing, compared with the sintered glazing steel of glazing, yield strength σ0.2t:
390MPa compares σ0.2eImprove 110MPa.
Embodiment 3
Step 1: glazing to be processed is placed in the mixing of 90g/L sodium hydroxide solution and 60g/L sodium carbonate liquor with steel
The profit of cleaning 10~15min removal surface of steel plate in liquid (sodium hydroxide solution and sodium carbonate liquor are mixed according to mass ratio 8:5)
Then the dirts such as lubricating oil and label paint are placed in 2~3min of middle cleaning removal steel surface in the hydrochloric acid solution of 24wt% again
Oxide skin；
Step 2: the uniform daub of glazing steel surface after step 1 pickling, coating with a thickness of 0.16~
0.20mm；
Step 3: the glazing after the uniform daub of step 2 is heated to 870 DEG C with steel with the heating rate of 1.5 DEG C/s
Heat preservation hot is carried out afterwards handles 5min；
Step 4: the glazing after step 3 is heat-treated is cooling using air-cooled mode with steel, first with the rate of temperature fall of 6 DEG C/s
400 DEG C are cooled to, then cooled to room temperature；
Step 5: being cooled to the glazing of room temperature with carrying out tempering after steel surface again uniform daub in step 4,
Wherein, coating with a thickness of 0.16~0.20mm, 600 DEG C of progress tempering 5min are heated to the heating rate of 1.5 DEG C/s；
Step 6: glazing after step 5 is tempered is placed in air cooled to room temperature with steel to obtain the final product.
The glazing of embodiment 3 is σ with its rolling state yield strength of steel0.2r: 335MPa；After glazing sintering heat treatment (the
When four the end of the step), the good glazing layer in surface is obtained, glazing steel is under with a thickness of 1.1~1.4mm, yield strength σ0.2e:
290Mpa has dropped 45MPa；After tempered processing, compared with the sintered glazing steel of glazing, yield strength σ0.2t:
380MPa compares σ0.2eImprove 90MPa.
Glazing obtains the good glazing layer in surface after glazing sintering with steel in the prior art, but yield strength obviously drops
It is low, under 1.1~1.4mm thickness, general yield strength: σ0.2Glaze after≤180MPa, the far smaller than embodiment of the present invention tempering
Change the yield strength for using steel.
The present invention provides the thinkings and method of a kind of heat treatment method for improving glazing hardness of steel, implement the skill
There are many method and approach of art scheme, the above is only a preferred embodiment of the present invention, it is noted that this technology is led
For the those of ordinary skill in domain, various improvements and modifications may be made without departing from the principle of the present invention, these
Improvements and modifications also should be regarded as protection scope of the present invention.The available prior art of each component part being not known in the present embodiment
It is realized.
Claims (8)
1. a kind of heat treatment method for improving glazing hardness of steel, which comprises the steps of:
Step 1: glazing to be processed being placed in lye with steel after cleaning 10~15min, then be placed in acid solution cleaning 2~
3min；
Step 2: the uniform daub of glazing steel surface after step 1 pickling；
Step 3: by the glazing after step 2 daub with steel be heated to 760~870 DEG C carry out heat preservation heat treatment 5~
10min；
Step 4: the glazing after step 3 is heat-treated is placed in air with steel to be cooled to room temperature；
Step 5: it is cooled to the glazing of room temperature steel surface uniform daub again in step 4, is then heated to 400~600
DEG C carry out 5~10min of tempering；
Glazing after step 5 tempering is placed in air with steel and is cooled to room temperature by step 6.
2. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 1
In, the lye is the mixed liquor that sodium hydroxide solution and sodium carbonate liquor are mixed according to mass ratio 8:5, wherein the hydrogen-oxygen
The concentration for changing sodium solution is 60~90g/L, and the concentration of the sodium carbonate liquor is 40~60g/L.
3. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 1
In, the acid solution is the hydrochloric acid solution of 20~24wt% of concentration.
4. it is according to claim 1 it is a kind of improve glazing hardness of steel heat treatment method, which is characterized in that step 2 and
In step 5, the coating is the century No.1 antioxidant coating purchased from Huangyan, Zhejiang sapecial coating factory, the coating layer thickness of smearing
For 0.16~0.20mm.
5. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 3
In, the heating rate of heating is controlled in 1~1.5 DEG C/s.
6. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 4
In, 400 DEG C first are cooled to the rate of temperature fall of 5~6 DEG C/s, then cooled to room temperature.
7. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 5
In, the heating rate of heating is controlled in 1~1.5 DEG C/s.
8. a kind of heat treatment method for improving glazing hardness of steel according to claim 1, which is characterized in that step 6
In, the glazing after tempering is directly placed at cooled to room temperature in air with steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017135.3A CN109097773A (en) | 2018-08-31 | 2018-08-31 | A kind of heat treatment method improving glazing hardness of steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811017135.3A CN109097773A (en) | 2018-08-31 | 2018-08-31 | A kind of heat treatment method improving glazing hardness of steel |
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| CN109097773A true CN109097773A (en) | 2018-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115283309B (en) * | 2022-07-06 | 2024-04-02 | 中船重工龙江广瀚燃气轮机有限公司 | Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method |
-
2018
- 2018-08-31 CN CN201811017135.3A patent/CN109097773A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115283309B (en) * | 2022-07-06 | 2024-04-02 | 中船重工龙江广瀚燃气轮机有限公司 | Method for removing residual scale and paint layer on surface of gas turbine casing by chemical method |
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