CN105420470A - Surface-hardening treatment method for austenitic steel - Google Patents
Surface-hardening treatment method for austenitic steel Download PDFInfo
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- CN105420470A CN105420470A CN201510742526.1A CN201510742526A CN105420470A CN 105420470 A CN105420470 A CN 105420470A CN 201510742526 A CN201510742526 A CN 201510742526A CN 105420470 A CN105420470 A CN 105420470A
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- hardening treatment
- austenitic steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- Crystallography & Structural Chemistry (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
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Abstract
The invention discloses a surface-hardening treatment method for austenitic steel. The surface-hardening treatment method for the austenitic steel includes the following steps that (1) the austenitic steel are blanked; (2) a blank is formed; (3) forging is carried out at the pressure of 50-80 kg/mm<2>; and (4) ageing is carried out. The surface-hardening treatment method for the austenitic steel has the beneficial effects that 1, the surface needing hardening is subjected to surface-hardening treatment in the part blank period, and the surface hardness of the part subjected to surface-hardening treatment is higher than that of a part subjected to traditional rolling treatment; 2, surface-hardening treatment is carried out in the part blank period, the forging pressure is large, and a formed hardening layer is deeper than that formed through rolling treatment; 3, parameters are adjusted as needed in the surface-hardening treatment process of the blank according to the finished product requirements of the part, so that the surface-hardening treatment method is wide in application range; and 4, surface-hardening treatment is carried out in the part blank period, and the part machining process has good manufacturability.
Description
Technical field
The present invention relates to austenitic steel Surface hardening treatment technology, particularly a kind of austenitic steel surface-hardening treatment method.
Background technology
Austenitic stainless steel is austenite structure at normal temperatures, and austenitic stainless steel is nonmagnetic has excellent corrosion resisting property, high tenacity and plasticity, is widely used in chemical machinery, pharmaceutical machine and food machinery.But because austenitic stainless steel hardness is low, wear no resistance, its surface property is just difficult to meet service requirements, greatly reduces the work-ing life of these components of machine.
Martensite Stainless Steel can carry out high-frequency quenching makes its surface hardening, and austenitic stainless steel can not make it strengthening by phase transformation, only strengthen by cold working hardenings such as roll extrusion, but austenitic steel is lower through roll extrusion post-hardening layer hardness, and surface hardening layer depth is more shallow, is difficult to meet wear resistance and requires higher environment for use.Also can, as common iron, utilize the outer surface treatment processs such as nitrogenize to carry out intensive treatment to it for austenitic steel, but its surface strengthening layer depth be more shallow.
Summary of the invention
The object of the invention is to for existing austenitic steel after roll extrusion cold working hardening processing, its cementation zone hardness is lower, and surface hardening layer depth is more shallow, be difficult to meet deficiency and the defect that wear resistance requires higher environment for use, there is provided a kind of austenitic steel surface-hardening treatment method, to solve the problem.
Technical problem solved by the invention can realize by the following technical solutions:
A kind of austenitic steel surface-hardening treatment method, is characterized in that, comprise the steps:
1) austenitic steel blanking;
2) blank is shaping;
3) forge, forging pressure is 50kg/mm
2-80kg/mm
2;
4) timeliness.
In a preferred embodiment of the invention, described step 2) and step 3) between also comprise solutionizing step.
In a preferred embodiment of the invention, the solid solution parameter of described solutionizing step is 1050 DEG C × 0.5 ~ 1h.
In a preferred embodiment of the invention, described timeliness parameter is 710 ~ 750 DEG C × 4h ~ 16h air cooling.
Owing to have employed technical scheme as above, beneficial effect of the present invention is:
1, this invention carries out Surface hardening treatment in the part blank stage to the surface that need harden, and the process of harveyed piece surface hardness ratio conventional roll wants high;
2, this invention carries out Surface hardening treatment in the part blank stage, and forge pressure comparatively large, the hardened-depth of formation is darker than roll extrusion process;
3, this invention according to finished part requirement, can adjust parameter in the Surface hardening treatment process of blank as required, and therefore this invention scope of application is wider;
4, this invention carries out Surface hardening treatment in the part blank stage, has good processing technology to parts machining process.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the shaping and thermal treatment schematic diagram of existing typical austenitic steel blast gate blank.
Fig. 2 is the austenitic steel blast gate blank stage surface hardening schematic diagram of an embodiment of the present invention.
Fig. 3 is the austenitic steel blast gate blank stage surface hardening schematic diagram of the another kind of embodiment of the present invention.
Embodiment
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further below.
Embodiment 1
Valve is the strength member of oil engine sealing air flue, and require that its valve sealing conical surface in working life has good wear resisting property, particularly blast gate is all the more so.Blast gate is manufactured for the GH4080A material of statement in valve material GB GB/T12773-2008 " Diesel Engine's Air Valve steel and alloy bar material ".
As shown in Figure 2, manufacture blast gate for GH4080A nickel-base high-temperature alloy material and technical solution of the present invention be described: step 1), carry out blanking by specifications of raw materials and length dimension; Step 2), carry out blank by valve blank physical dimension shaping; Step 3), the solid solution parameter of recommending by GB carries out solid solution (solid solution parameter is 1050 DEG C × 1h solid solution) to valve blank; Step 4), forge valve blank sealing cone, forging pressure is 50kg/mm
2-80kg/mm
2; Step 5), the timeliness parameter of recommending by GB carries out timeliness (timeliness parameter is 710 DEG C × 16h air cooling) to valve blank.The shaping valve blank of GH4080A nickel-base high-temperature alloy material is by after machining shown in Fig. 2, and valve blank sealing cone hardness is 40HRC-48HRC.
Comparative example 1
Process by shown in Fig. 1, step 1), carry out blanking by specifications of raw materials and length dimension; Step 2), carry out blank by valve blank physical dimension shaping; Step 3), the heat treatment parameter recommended by GB carries out solid solution aging (solid solution aging parameter is 1050 DEG C × 1h solid solution, 710 DEG C × 16h air cooling) to valve blank.The shaping valve blank of GH4080A nickel-base high-temperature alloy material is by after machining described in Fig. 1, and valve blank sealing cone hardness is 32HRC-38HRC.
Embodiment 2
Shown in Figure 2, manufacture blast gate for NCF3015 high temperature alloy and technical solution of the present invention is described: step 1), carry out blanking by specifications of raw materials and length dimension; Step 2), carry out blank by valve blank physical dimension shaping; Step 3), by the solid solution parameter of recommending, solid solution (solid solution parameter is 1050 DEG C × 0.5h solid solution) is carried out to valve blank; Step 4), forge valve blank sealing cone, forging pressure is 50kg/mm
2-80kg/mm
2; Step 5), by the timeliness parameter of recommending, timeliness (timeliness parameter is 750 DEG C × 4h air cooling) is carried out to valve blank.The shaping valve blank of NCF3015 high temperature alloy is by after machining shown in Fig. 2, and valve blank sealing cone hardness is 44HRC-52HRC.
Comparative example 2
Existing typical blast gate processing scheme as shown in Figure 1, manufactures blast gate for valve material NCF3015 high temperature alloy, processes, step 1 by shown in Fig. 1), carry out blanking by specifications of raw materials and length dimension; Step 2), carry out blank by valve blank physical dimension shaping; Step 3), by the heat treatment parameter recommended, solid solution aging (solid solution aging parameter is 1050 DEG C × 0.5h solid solution, 750 DEG C × 4h air cooling) is carried out to valve blank.The valve blank of NCF3015 forming materials is by after machining described in Fig. 1, and valve blank sealing cone hardness is 36HRC-42HRC.
Embodiment 3
Before needing the surface hardness at sclerosis position more shaping, have reduction for hot-forging forming blank, according to part needs, solution treatment can not carried out.Shown in Figure 3, manufacture blast gate for NCF3015 high temperature alloy and technical solution of the present invention is described: step 1), carry out blanking by specifications of raw materials and length dimension; Step 2), carry out blank by valve blank physical dimension shaping; Step 3), forge valve blank sealing cone, forging pressure is 50kg/mm
2-80kg/mm
2; Step 4), by the timeliness parameter of recommending, timeliness (timeliness parameter is 750 DEG C × 4h air cooling) is carried out to valve blank.The valve blank of NCF3015 forming materials is by after machining shown in Fig. 3, and valve blank sealing cone hardness is 40HRC-48HRC.
The performance perameter of the various embodiments described above and comparative example can be drawn by following table:
The conical surface hardness that the conical surface hardness obtained through austenitic steel surface-hardening treatment method of the present invention is obviously better than prior art treatment process and obtains can be learnt by upper table.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. an austenitic steel surface-hardening treatment method, comprises the steps:
1) austenitic steel blanking;
2) blank is shaping;
3) forge, forging pressure is 50kg/mm
2-80kg/mm
2;
4) timeliness.
2. a kind of austenitic steel surface-hardening treatment method as claimed in claim 1, is characterized in that, described step 2) and step 3) between also comprise solutionizing step.
3. a kind of austenitic steel surface-hardening treatment method as claimed in claim 2, is characterized in that, the solid solution parameter of described solutionizing step is 1050 DEG C × 0.5 ~ 1h.
4. a kind of austenitic steel surface-hardening treatment method as described in claim 1 or 2 or 3, is characterized in that, described timeliness parameter is 710 ~ 750 DEG C × 4h ~ 16h air cooling.
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| CN201510742526.1A CN105420470A (en) | 2015-11-04 | 2015-11-04 | Surface-hardening treatment method for austenitic steel |
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| CN201510742526.1A CN105420470A (en) | 2015-11-04 | 2015-11-04 | Surface-hardening treatment method for austenitic steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401686A (en) * | 2016-12-21 | 2017-02-15 | 湖南天雁机械有限责任公司 | Enhanced engine valve and manufacturing process thereof |
| CN107574294A (en) * | 2017-08-31 | 2018-01-12 | 重庆跃进机械厂有限公司 | The heat processing technique of 4Cr14Ni14W2Mo air valves |
| CN110814662A (en) * | 2019-11-22 | 2020-02-21 | 重庆跃进机械厂有限公司 | Method for processing diesel engine valve blank |
| CN110977625A (en) * | 2019-12-30 | 2020-04-10 | 济南沃德汽车零部件有限公司 | Method for improving wear resistance of conical surface of valve disc and reducing surface roughness |
| CN111575464A (en) * | 2020-05-29 | 2020-08-25 | 青岛丰东热处理有限公司 | Method for improving surface hardening layer of austenitic stainless steel |
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2015
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401686A (en) * | 2016-12-21 | 2017-02-15 | 湖南天雁机械有限责任公司 | Enhanced engine valve and manufacturing process thereof |
| CN107574294A (en) * | 2017-08-31 | 2018-01-12 | 重庆跃进机械厂有限公司 | The heat processing technique of 4Cr14Ni14W2Mo air valves |
| CN107574294B (en) * | 2017-08-31 | 2018-11-13 | 重庆跃进机械厂有限公司 | The heat processing technique of 4Cr14Ni14W2Mo air valves |
| CN110814662A (en) * | 2019-11-22 | 2020-02-21 | 重庆跃进机械厂有限公司 | Method for processing diesel engine valve blank |
| CN110814662B (en) * | 2019-11-22 | 2021-08-17 | 重庆跃进机械厂有限公司 | Method for processing diesel engine valve blank |
| CN110977625A (en) * | 2019-12-30 | 2020-04-10 | 济南沃德汽车零部件有限公司 | Method for improving wear resistance of conical surface of valve disc and reducing surface roughness |
| CN110977625B (en) * | 2019-12-30 | 2021-11-09 | 济南沃德汽车零部件有限公司 | Method for improving wear resistance of conical surface of valve disc and reducing surface roughness |
| CN111575464A (en) * | 2020-05-29 | 2020-08-25 | 青岛丰东热处理有限公司 | Method for improving surface hardening layer of austenitic stainless steel |
| CN111575464B (en) * | 2020-05-29 | 2022-04-08 | 青岛丰东热处理有限公司 | Method for improving surface hardening layer of austenitic stainless steel |
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