CN105950834A - Surface treatment process of stainless steel machined product - Google Patents
Surface treatment process of stainless steel machined product Download PDFInfo
- Publication number
- CN105950834A CN105950834A CN201610422388.3A CN201610422388A CN105950834A CN 105950834 A CN105950834 A CN 105950834A CN 201610422388 A CN201610422388 A CN 201610422388A CN 105950834 A CN105950834 A CN 105950834A
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- China
- Prior art keywords
- rustless steel
- processes
- vacuum
- machining
- goods
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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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a surface treatment process of a stainless steel machined product. The surface treatment process of the stainless steel machined product can improve both the hardness of the surface and the abrasion resistance of the surface. The surface treatment process includes the steps that annealing is firstly performed in vacuum where protective gas is nitrogen gas and temperature ranges from 1050 DEG C to 1250 DEG C; then, NH4Cl or HCl is adopted to perform the surface activation treatment in vacuum where temperature ranges from 500 DEG C to 800 DEG C and pressure is 100 torr or below; and next, independent gas of acetylene or ammonia gas is led in in vacuum where temperature is 550 DEG C or below and pressure is 300 torr or below, or acetylene and ammonia gas mixed gas is led in in vacuum to perform carbonitriding treatment. The surface treatment process is especially suitable for stainless steel anti-loosing self-locking gaskets.
Description
Technical field
The present invention relates to a kind of metal surface treatment process, be specifically related to a kind of rustless steel machining goods
Process of surface treatment.
Background technology
At present, the surface of self-locking gasket locking to rustless steel processes and generally uses cryogenic gas carbo-nitriding or aura
The methods such as ionic nitriding so that the surface of the locking self-locking gasket of rustless steel is formed as chromium carbide (Cr23C6), nitridation
The compound of chromium (CrN), to increase the hardness of described gasket surface；But, said method can make described pad
Sheet surface forms the chromium content of dense oxide chromium and reduces, and this reduces stainless corrosion resistance.True
On, a lot of pads in use or use front surface to get rusty, it is impossible to meet the most corrosion-resistant but also wear-resisting use
Requirement.
Summary of the invention
The technical problem to be solved is: provide a kind of hardness, but also permissible that not only can improve surface
Improve the process of surface treatment of the rustless steel machining goods of the corrosion resistance on surface.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the table of rustless steel machining goods
Face processes technique, the steps include: the stainless steel products that machining is obtained carry out successively making annealing treatment, surface
Activation, carbo-nitriding process；Described annealing, surface activation process and at carbo-nitriding
Reason is carried out the most in a vacuum；When annealing, the protective gas in vacuum is nitrogen, and temperature controls
Between 1050 DEG C-1250 DEG C, at 300 Torrs, (Torr i.e. torr, 1 Torr is equivalent to 1 millimeter of mercury to Stress control
Pressure) below；When surface activation processes, temperature controls between 500 DEG C-800 DEG C, Stress control
Below 100 Torrs, use NH4The surface of described machining goods is individually processed by Cl or HCl, or,
Use NH4The surface of described machining goods is processed by Cl and HCl；When carbo-nitriding processes, temperature
Controlling below 550 DEG C, Stress control, below 300 Torrs, imports acetylene or the independent gas of ammonia in a vacuum,
Or, import acetylene and the mixed gas of ammonia in a vacuum.
As a kind of preferred version, in the process of surface treatment of described rustless steel machining goods, at carbon
Nitrogen oozes in processing procedure altogether, when importing acetylene and ammonia in a vacuum, and the relative discharge of regulation both gas,
Make in infiltration layer the distribution of carbon away from surface some, and nitrogen element is near surface.
As a kind of preferred version, in the process of surface treatment of described rustless steel machining goods, at carbon
When nitrogen oozes process altogether, temperature controls between 300 DEG C-550 DEG C.
As a kind of preferred version, in the process of surface treatment of described rustless steel machining goods, described
Rustless steel be austenitic stainless steel, martensitic stain less steel or two phase stainless steel.
As a kind of preferred version, in the process of surface treatment of described rustless steel machining goods, described
Rustless steel machining goods be the locking self-locking gasket of rustless steel.
The invention has the beneficial effects as follows: insider both knows about, stainless steel gasket is after machine-shaping, interior
Portion's metallographic structure there occurs that great changes, distortion of lattice, crystal grain are elongated, and is not the most single austenite
Organize, greatly differ from each other from statenchyma, when its surface is processed, it is easy to formed carbide or
Nitride, to this end, the present invention is before surface processes, enters in the vacuum environment that protective gas is nitrogen it
Row annealing, to eliminate distortion of lattice and grain deformation, it is thus achieved that austenite structure completely, for follow-up table
Face processes and has prepared balance metallographic structure, and, high temperature nitrogen is decomposed can make a small amount of nitrogen-atoms uniformly be diffused into
In matrix, this is solid-solubilized in the nitrogen element in austenite on a small quantity, can improve the hardness of matrix, and this is for locking
The auto-lock function of self-locking gasket is helpful；It addition, the maximum difficult point of carbo-nitriding is rustless steel before treatment
Surface activation processes, the removal of dense oxide chromium；The present invention is by suitable by using under vacuum conditions
Reducing agent eliminate dense oxide chromium well in moderate moisture, process for follow-up carbo-nitriding and perform
Prepare；The present invention uses acetylene (C2H2) when low temperature carburization as carburizing gas, both can prevent white carbon black
Formed, metal surface can be made to keep bright and clean, and, acetylene is also as the supply source of carbon；Carbo-nitriding
After process, metal surface does not has compound layer.
Twist it is demonstrated experimentally that the locking self-locking gasket of rustless steel after above-mentioned PROCESS FOR TREATMENT is more than at loosening torque
On the premise of tight moment of torsion, the time of resistance to neutral salt spray test can reach more than 120 hours.
Accompanying drawing explanation
Fig. 1 is the locking self-locking gasket after using process of surface treatment of the present invention to process and self-lock mechanism
Structural representation.
Fig. 2 is the apparent condition comparison diagram after salt spray test.
Detailed description of the invention
Below in conjunction with the accompanying drawings, as a example by the locking self-locking gasket of rustless steel, one of the present invention is described in detail not
The specific embodiments of the process of surface treatment of rust steel machining goods:
The process of surface treatment of a kind of rustless steel of the present invention machining goods, the steps include: to add machine
The locking self-locking gasket of rustless steel (the most locking self-locking gasket) that work obtains carries out making annealing treatment successively, table
Face activation, carbo-nitriding process；Described annealing, surface activation process and carbo-nitriding
Process and carry out the most in a vacuum；When annealing, the protective gas in vacuum is nitrogen, and temperature controls
Between 1050 DEG C-1250 DEG C, at 300 Torrs, (Torr i.e. torr, 1 Torr is equivalent to 1 millimeter of mercury to Stress control
Pressure) below；When surface activation processes, temperature controls between 500 DEG C-800 DEG C, and Stress control exists
Less than 100 Torrs, use NH4The surface of locking self-locking gasket is individually processed by Cl or HCl, or, adopt
Use NH4The surface of described machining goods is processed by Cl and HCl；When carbo-nitriding processes, temperature control
System is between 300 DEG C-550 DEG C, and Stress control, below 300 Torrs, imports acetylene in a vacuum or ammonia is independent
Gas, or, import acetylene and the mixed gas of ammonia in a vacuum.In the present embodiment, described not
Rust steel is austenitic stainless steel.
Certainly, rustless steel of the present invention machining goods process of surface treatment for martensitic stain less steel,
Two phase stainless steel, carbon steel or steel alloy machining goods are all suitable for.
When reality is applied, in carbo-nitriding processing procedure, when can import acetylene and ammonia in a vacuum,
The relative discharge of regulation both gas so that in infiltration layer the distribution of carbon away from surface some, and nitrogen element leans on
Near surface；In order to prevent the surface of activation from again exposing in atmosphere so that Surface Creation passivating film,
Surface activation processes and carbo-nitriding processes and must carry out in the same apparatus, must not be exposed to big compression ring
Under border.
As it is shown in figure 1, the locking self-locking gasket processed through process of surface treatment of the present invention,
Between connected piece 3 and screw 1, there is a pair locking self-locking gasket 2.Angle of thread β of screw 1 is less than
The occlusal surface inclination alpha of locking self-locking gasket 2, when vibration, occlusal rotation makes screw 1 generation draw should
Power, thus screw 1 can be effectively prevented and loosen.
As seen from Figure 2, the sample B that the Sample A of general carbo-nitriding method process and the present invention process
Outward appearance far from each other；And, its hardness and neutral salt spray test result also obvious difference, concrete data are detailed
It is shown in Table 1.
Table 1: the corrosion-resistant and relation of surface Vickers hardness of the sample processed under different condition
Disclosed by the invention is widely suitable to needing to have both the medical apparatus and instruments of wear-resisting and corrosion-resistant requirement, petrochemical industry
The metallic element of the various application scenarios such as machinery, marine ship, bridge railway carries out surface process, and not
It is limited only to self-locking gasket locking to rustless steel.
In sum, only presently preferred embodiments of the present invention, not it is used for limiting the model that the present invention implements
Enclose, all impartial changes made according to the shape described in scope of the invention as claimed, structure, feature and spirit
With modification, all should be included in scope of the presently claimed invention.
Claims (6)
1. a process of surface treatment for rustless steel machining goods, the steps include: to obtain not machining
Rust steel part carries out making annealing treatment successively, surface activation processes, carbo-nitriding processes；Described is annealing treatment
Reason, surface activation process and carbo-nitriding processes and carries out the most in a vacuum；When annealing, in vacuum
Protective gas be nitrogen, temperature controls between 1050 DEG C-1250 DEG C；When surface activation processes, temperature
Degree controls between 500 DEG C-800 DEG C, and Stress control, below 100 Torrs, uses NH4Cl or HCl is the most right
The surface of described machining goods processes, or, use NH4Cl and HCl is to described machining goods
Surface processes；When carbo-nitriding processes, temperature controls below 550 DEG C, and Stress control is at 300 Torrs
Hereinafter, import acetylene or the independent gas of ammonia in a vacuum, or, import acetylene and ammonia in a vacuum
Mixed gas.
The process of surface treatment of a kind of rustless steel the most according to claim 1 machining goods, its feature
It is: in carbo-nitriding processing procedure, when importing acetylene and ammonia in a vacuum, regulates both gas
Relative discharge so that in infiltration layer the distribution of carbon away from surface some, and nitrogen element is near surface.
The process of surface treatment of a kind of rustless steel the most according to claim 1 machining goods, its feature
It is: when carbo-nitriding processes, temperature controls between 300 DEG C-550 DEG C.
The surface of a kind of rustless steel the most according to any one of claim 1 to 3 machining goods processes
Technique, it is characterised in that: described rustless steel is austenitic stainless steel, martensitic stain less steel or two-phase stainless
Steel.
The surface of a kind of rustless steel the most according to any one of claim 1 to 3 machining goods processes
Technique, it is characterised in that: described rustless steel machining goods are the locking self-locking gasket of rustless steel.
The process of surface treatment of a kind of rustless steel the most according to claim 4 machining goods, its feature
It is: described rustless steel machining goods are the locking self-locking gasket of rustless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610422388.3A CN105950834A (en) | 2016-06-13 | 2016-06-13 | Surface treatment process of stainless steel machined product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610422388.3A CN105950834A (en) | 2016-06-13 | 2016-06-13 | Surface treatment process of stainless steel machined product |
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| CN105950834A true CN105950834A (en) | 2016-09-21 |
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ID=56906578
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610422388.3A Pending CN105950834A (en) | 2016-06-13 | 2016-06-13 | Surface treatment process of stainless steel machined product |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106741205A (en) * | 2016-12-27 | 2017-05-31 | 北京新能源汽车股份有限公司 | Engine hood lock and method for manufacturing engine hood lock |
| CN109022730A (en) * | 2018-10-26 | 2018-12-18 | 重庆工业职业技术学院 | Austenite stainless steel surface S phase and anti-corrosion layer acquisition methods |
| 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 |
| CN111575637A (en) * | 2020-05-29 | 2020-08-25 | 青岛丰东热处理有限公司 | Method for low-temperature nitrocarburizing of austenitic stainless steel surface |
| CN114059006A (en) * | 2021-11-03 | 2022-02-18 | 龙工（上海）精工液压有限公司 | Process for controlling tufftriding deformation of plunger pump cylinder body |
| RU2782414C1 (en) * | 2021-11-11 | 2022-10-26 | Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") | METHOD FOR GAS LOW-TEMPERATURE NITRO-CEMENTATION OF TOOL MADE OF HIGH-SPEED STEELS (SATURATION LAYERS UP TO 0.05 mm) WITHOUT CARBONITRIDE HIGH-NITROGEN SURFACE LAYER IN VACUUM FURNACES |
| CN115537712A (en) * | 2022-09-22 | 2022-12-30 | 中国石油大学(华东) | Chemical heat treatment method for improving hydrogen resistance of gamma-alpha double-phase stainless steel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106741205A (en) * | 2016-12-27 | 2017-05-31 | 北京新能源汽车股份有限公司 | Engine hood lock and method for manufacturing engine hood lock |
| CN109022730A (en) * | 2018-10-26 | 2018-12-18 | 重庆工业职业技术学院 | Austenite stainless steel surface S phase and anti-corrosion layer acquisition methods |
| 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 |
| CN111575637A (en) * | 2020-05-29 | 2020-08-25 | 青岛丰东热处理有限公司 | Method for low-temperature nitrocarburizing of austenitic stainless steel surface |
| CN111575637B (en) * | 2020-05-29 | 2021-12-14 | 青岛丰东热处理有限公司 | Method for low-temperature nitrocarburizing of austenitic stainless steel surface |
| 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 |
| CN114059006A (en) * | 2021-11-03 | 2022-02-18 | 龙工（上海）精工液压有限公司 | Process for controlling tufftriding deformation of plunger pump cylinder body |
| RU2782414C1 (en) * | 2021-11-11 | 2022-10-26 | Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") | METHOD FOR GAS LOW-TEMPERATURE NITRO-CEMENTATION OF TOOL MADE OF HIGH-SPEED STEELS (SATURATION LAYERS UP TO 0.05 mm) WITHOUT CARBONITRIDE HIGH-NITROGEN SURFACE LAYER IN VACUUM FURNACES |
| CN115537712A (en) * | 2022-09-22 | 2022-12-30 | 中国石油大学(华东) | Chemical heat treatment method for improving hydrogen resistance of gamma-alpha double-phase stainless steel |
| CN115537712B (en) * | 2022-09-22 | 2024-06-11 | 中国石油大学(华东) | Chemical heat treatment method for improving hydrogen resistance of gamma-alpha duplex stainless steel |
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