CN102876865A - Heat treatment method of 304 stainless steel - Google Patents
Heat treatment method of 304 stainless steel Download PDFInfo
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- CN102876865A CN102876865A CN 201210318610 CN201210318610A CN102876865A CN 102876865 A CN102876865 A CN 102876865A CN 201210318610 CN201210318610 CN 201210318610 CN 201210318610 A CN201210318610 A CN 201210318610A CN 102876865 A CN102876865 A CN 102876865A
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Abstract
The invention relates to a heat treatment method of 304 stainless steel. The stainless steel comprises the following chemical compositions in percent by weight: less than or equal to 0.07 percent of C, less than or equal to 1.0 percent of Si, 17.0 to 19.0 percent of Cr, less than or equal to 2.0 percent of Mn, 8.0 to 11.0 percent of Ni, less than or equal to 0.03 percent of S, less than or equal to 0.035 percent of P, and Fe in balancing amount. The heat treatment method of the 304 stainless steel comprises the following steps: step I, placing semi-finished 304 stainless steel in a heat treatment furnace for heat treatment, and placing the semi-finished 304 stainless steel subjected to heat treatment in the water for quenching; and step II, taking the quenched semi-finished product out of the water, cooling, placing the cooled semi-finished product in a tempering furnace, heating and then continuously cooling to obtain a product with the hardness of more than or equal to 45 HRC and the tensile strength of 620 MIN. The finished stainless steel obtained by the heat treatment method can eliminate stress, reduce intergranular corrosion tendency and achieve improved corrosion resistance.
Description
Technical field
The present invention relates to 304 stainless steel manufacture fields, relate in particular to a kind of 304 stainless heat treating methods.
Background technology
Stainless steel can not produce burn into spot corrosion, corrosion or wearing and tearing.One of material that intensity is the highest in stainless steel or the metallic substance for building.Because stainless steel has good erosion resistance, so the integrity that it can make structure unit for good and all keep engineering to relate to.Chromium stainless steel also integrates physical strength and Gao Yan natural disposition, is easy to the processing and manufacturing of parts, can satisfy architect and structure design personnel's needs.Stainless steel can be divided into by composition at present: chromium system, chromium nickel system, chromium manganese nickel system.It is stainless steel that 304 stainless steels belong to chromium nickel, generally adopts electrosmelting, lost foam casting, and through normalizing, quenching and temper, its chromium content is 〉=18%, also contains the elements such as nickel, titanium, its metallographic structure is mainly austenite.Process stainless complex process in the prior art, cost is higher, and hardness and tensile strength are lower.
Summary of the invention
The present invention provides a kind of 304 stainless heat treating methods in order to overcome the deficiency of above technology, and it can obtain higher hardness and tensile strength, to reach the purpose that improves work-ing life.
Technical scheme of the present invention is: a kind of 304 stainless heat treating methods, it is characterized in that: described 304 stainless steels chemical composition by weight percentage is: C :≤0.07%, Si :≤1.0%, Cr:17.0-19.0%, Mn :≤2.0%, Ni:8.0-11.0%, S :≤0.03%, P :≤0.035%, and surplus is Fe;
Described 304 stainless steel hots are processed and are comprised the steps:
Step 1, work in-process 304 stainless steels are put into heat treatment furnace, after heat-treating, put into water and quench;
Step 2, will quench after work in-process from water, take out, put into tempering stove after the cooling, continue cooling after the heating, obtain hardness 〉=45HRC, tensile strength is the goods of 620MIN.
In the described step 1, heat treated concrete steps are: after work in-process 304 stainless steels are heated to 1050～1150 ℃, be incubated 20-60 minute.
In the described step 1, put into the concrete steps that water quenches and be: it is that 30-40 ℃ of water soaked 1-6 minute that work in-process 304 stainless steels are put into initial temperature.
Described quenching step is preferably: it is that 35 ℃ of water soaked 4 minutes that work in-process 304 stainless steels are put into initial temperature.
In the described step 2, the temperature that 304 stainless steel work in-process are put into before the tempering stove is normal temperature.
In the described step 2, Heating temperature is 850～880 ℃ in the tempering stove, is incubated 2 hours.
In the described step 2, described continuation cooling step is: work in-process 304 stainless steels are put into burial pit naturally cool to below 100 ℃, then be cooled to room temperature fully in the postponement district.
The beneficial effect that the present invention has: process the finished product 304 stainless steel hardness that obtain through method of the present invention and can reach 〉=45HRC, tensile strength is the performance of 620MIN, can reach and save the ferrochrome resource, the effect that significantly reduces production costs has wide market outlook.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
Reach technique means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, embodiment, step, feature and the effect thereof of the 304 stainless heat treating methods that foundation the present invention is proposed are described in detail as follows.
Embodiment 1:
304 stainless steel compositions by weight percentage are: 0.05%C, 0.8%Si, 18.0%Cr:, 1.0%Mn, 9.0%Ni, 0.01%S, 0.03%P, surplus is Fe and impurity.The present embodiment comprises the steps:
Step 1, work in-process 304 stainless steels are put into heat treatment furnace, after heat-treating, put into water and quench.
Get work in-process 304 stainless steels, pack in the metal screen frame, put into heat treatment furnace, stainless steel is heated to 1080 ℃ after, be incubated 30 minutes; Afterwards whole frame work in-process 304 stainless steels are put into ready 30 ℃ pond and quench, the time of quenching is 2 minutes.
Step 2 is taken out work in-process after quenching from water, put into tempering stove after the cooling.Continue cooling after the heating.
After quenching work in-process are picked up from the pond, be cooled to room temperature and put into tempering stove, be heated to 850 ℃, constant temperature kept 2 hours afterwards, then work in-process was put into burial pit and naturally cooled to 80 ℃, then was cooled to room temperature fully in the postponement district.
The implementation result of the present embodiment: after processing through the method for the present embodiment, the finished product trade mark 304 stainless steel hardness that obtain can reach 48HRC, and tensile strength is 620MIN, thereby realize saving ferrochrome resource, the effect that significantly reduces production costs.
Embodiment 2:
304 stainless steel compositions by weight percentage are: 0.03%C, 0.5%Si, 17.0%Cr:, 1.5%Mn, 10.0%Ni, 0.02%S, 0.025%P, surplus is Fe and impurity.The present embodiment comprises the steps:
Step 1, work in-process 304 stainless steels are put into heat treatment furnace, after heat-treating, put into water and quench.
Get work in-process 304 stainless steels, pack in the metal screen frame, put into heat treatment furnace, stainless steel is heated to 1100 ℃ after, be incubated 40 minutes; Afterwards whole frame work in-process 304 stainless steels are put into ready 35 ℃ pond and quench, the time of quenching is 3 minutes.
Step 2 is taken out work in-process after quenching from water, put into tempering stove after the cooling.Continue cooling after the heating.
After quenching work in-process are picked up from the pond, be cooled to room temperature and put into tempering stove, be heated to 860 ℃, constant temperature kept 2 hours afterwards, then work in-process was put into burial pit and naturally cooled to 70 ℃, then was cooled to room temperature fully in the postponement district.
The implementation result of the present embodiment: after processing through the method for the present embodiment, the finished product trade mark 304 stainless steel hardness that obtain can reach 50HRC, and tensile strength is 620MIN, thereby realize saving ferrochrome resource, the effect that significantly reduces production costs.
Embodiment 3:
304 stainless steel compositions by weight percentage are: 0.02%C, 0.3%Si, 19.0%Cr:, 1.8%Mn, 11.0%Ni, 0.03%S, 0.02%P, surplus is Fe and impurity.The present embodiment comprises the steps:
Step 1, work in-process 304 stainless steels are put into heat treatment furnace, after heat-treating, put into water and quench.
Get work in-process 304 stainless steels, pack in the metal screen frame, put into heat treatment furnace, stainless steel is heated to 1130 ℃ after, be incubated 50 minutes; Afterwards whole frame work in-process 304 stainless steels are put into ready 38 ℃ pond and quench, the time of quenching is 4 minutes.
Step 2 is taken out work in-process after quenching from water, put into tempering stove after the cooling.Continue cooling after the heating.
After quenching work in-process are picked up from the pond, be cooled to room temperature and put into tempering stove, be heated to 870 ℃, constant temperature kept 2 hours afterwards, then work in-process was put into burial pit and naturally cooled to 60 ℃, then was cooled to room temperature fully in the postponement district.
The implementation result of the present embodiment: after processing through the method for the present embodiment, the finished product trade mark 304 stainless steel hardness that obtain can reach 52HRC, and tensile strength is 620MIN, thereby realize saving ferrochrome resource, the effect that significantly reduces production costs.
Above-described embodiment provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be in the situation that do not break away from thought of the present invention; above-described embodiment is made various modifications or variation; therefore protection scope of the present invention is not limit by above-described embodiment, and should be the maximum range that meets the inventive features that claims mention.
Claims (7)
1. stainless heat treating method, it is characterized in that: described 304 stainless steels chemical composition by weight percentage is: C :≤0.07%, Si :≤1.0%, Cr:17.0-19.0%, Mn :≤2.0%, Ni:8.0-11.0%, S :≤0.03%, P :≤0.035%, and surplus is Fe;
Described 304 stainless steel hots are processed and are comprised the steps:
Step 1, work in-process 304 stainless steels are put into heat treatment furnace, after heat-treating, put into water and quench;
Step 2, will quench after work in-process from water, take out, put into tempering stove after the cooling, continue cooling after the heating, obtain hardness 〉=45HRC, tensile strength is the goods of 620MIN.
2. according to claim 1 304 stainless heat treating methods, it is characterized in that: in the described step 1, heat treated concrete steps are: after work in-process 304 stainless steels are heated to 1050～1150 ℃, be incubated 20-60 minute.
3. according to claim 1 304 stainless heat treating methods is characterized in that: in the described step 1, put into the concrete steps that water quenches and be: it is that 30-40 ℃ of water soaked 1-6 minute that work in-process 304 stainless steels are put into initial temperature.
4. according to claim 3 304 stainless heat treating methods, it is characterized in that: described quenching step is preferably: it is that 35 ℃ of water soaked 4 minutes that work in-process 304 stainless steels are put into initial temperature.
5. according to claim 1 304 stainless heat treating methods is characterized in that: in the described step 2, the temperature that 304 stainless steel work in-process are put into before the tempering stove is normal temperature.
6. according to claim 1 304 stainless heat treating methods is characterized in that: in the described step 2, heating humidity is 850～880 ℃ in the tempering stove, is incubated 2 hours.
7. according to claim 1 304 stainless heat treating methods, it is characterized in that: in the step 2, described continuation cooling step is: work in-process 304 stainless steels are put into burial pit naturally cool to below 100 ℃, then be cooled to room temperature fully postponing the district.
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| CN 201210318610 CN102876865A (en) | 2012-08-31 | 2012-08-31 | Heat treatment method of 304 stainless steel |
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| CN 201210318610 CN102876865A (en) | 2012-08-31 | 2012-08-31 | Heat treatment method of 304 stainless steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484621A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method for stainless steel |
| CN103498035A (en) * | 2013-09-26 | 2014-01-08 | 无锡阳工机械制造有限公司 | Thermal treatment method of stainless steel |
| CN107904365A (en) * | 2017-10-19 | 2018-04-13 | 常熟中德重机有限公司 | A kind of heat treatment process of constructing tunnel bogie frame |
| CN109778077A (en) * | 2017-11-10 | 2019-05-21 | 大连华锐重工集团股份有限公司 | The smelting process of one seed nucleus main pump pump case material |
| CN110468348A (en) * | 2019-09-16 | 2019-11-19 | 无锡市法兰锻造有限公司 | A kind of used in nuclear power station 022Cr19Ni10 steel flange and its manufacturing method |
-
2012
- 2012-08-31 CN CN 201210318610 patent/CN102876865A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103484621A (en) * | 2013-09-26 | 2014-01-01 | 无锡阳工机械制造有限公司 | Heat treatment method for stainless steel |
| CN103498035A (en) * | 2013-09-26 | 2014-01-08 | 无锡阳工机械制造有限公司 | Thermal treatment method of stainless steel |
| CN107904365A (en) * | 2017-10-19 | 2018-04-13 | 常熟中德重机有限公司 | A kind of heat treatment process of constructing tunnel bogie frame |
| CN107904365B (en) * | 2017-10-19 | 2019-08-23 | 常熟中德重机有限公司 | A kind of heat treatment process of constructing tunnel bogie frame |
| CN109778077A (en) * | 2017-11-10 | 2019-05-21 | 大连华锐重工集团股份有限公司 | The smelting process of one seed nucleus main pump pump case material |
| CN110468348A (en) * | 2019-09-16 | 2019-11-19 | 无锡市法兰锻造有限公司 | A kind of used in nuclear power station 022Cr19Ni10 steel flange and its manufacturing method |
| CN110468348B (en) * | 2019-09-16 | 2022-04-29 | 无锡市法兰锻造有限公司 | 022Cr19Ni10 stainless steel flange for nuclear power station and manufacturing method thereof |
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Application publication date: 20130116 |