CN100365156C - Air/gasoline ion multi element copermeation technology of steel - Google Patents
Air/gasoline ion multi element copermeation technology of steel Download PDFInfo
- Publication number
- CN100365156C CN100365156C CNB2005100571189A CN200510057118A CN100365156C CN 100365156 C CN100365156 C CN 100365156C CN B2005100571189 A CNB2005100571189 A CN B2005100571189A CN 200510057118 A CN200510057118 A CN 200510057118A CN 100365156 C CN100365156 C CN 100365156C
- Authority
- CN
- China
- Prior art keywords
- workpiece
- ion
- gasoline
- air
- break
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The present invention discloses air/gasoline ion multicomponent metallization technology for steel, which relates to steel surface intensifying technology. The present invention uses gas which is mostly full of air as gas sources. Carbon sources are supplied by gasoline volatilization so as to realize multicomponent metallization of nitrogen, carbon and oxygen. The present invention comprises the steps: a workpiece which is quenched and tempered is cleaned and dried and is put in a furnace, an ion nitriding furnace is vacuated, the DC voltage is input, the air and the gasoline are input according to proportion, and simultaneously, the heating, the thermal insulation, the furnace cooling and the furnace discharge are carried out. Because of not using alkaline gas or nitrogen hydrogen gas, the cost is reduced, the environmental pollution and the safety hidden trouble brought by a high pressure gas cylinder are reduced, and the abrasion resistance and the hardness of a nitriding workpiece can be improved. The present invention is suitable for the surface intensification of carbon steel, alloy structural steel and die steel.
Description
Technical field:
The invention belongs to steel surface reinforcement technology.Be applicable to the surface strengthening of carbon steel, structural alloy steel and mould steel.
Background technology:
The Chinese invention patent application number is 200410021642.6, its denomination of invention is " the air ion cxygen nitrogen coinfiltration technology patent of ferrous metal ", this technical process is: (1) is with the workpiece cleaning after modified, drying, place on the cathode disc, close body of heater, will be evacuated in the ion-nitriding furnace to 50～120Pa with mechanical pump; (2) to stove, break up arc to the adjustable high direct voltage of anode and cathode input 10～1000V, break up after the arc rareness again straightening stream voltage until not beating or break up less arc; (3) in nitriding furnace, feed ammonia or nitrogen-hydrogen gas mixture; (4) with 50～100 ℃/hour speed workpiece is heated to 500～580 ℃; (5) insulation is after 0.5～60 hour, close source of the gas and power supply, get rid of ammonia or nitrogen-hydrogen gas mixture in the ion-nitriding furnace with mechanical pump, be chilled to 50～150 ℃ with 50～100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.But this patent application be the air that utilizes and ammonia as the nitriding source of the gas, have the pollution of ammonia to environment.
In this technical process, nitriding gas inserts the valve of the bottom of drying cylinder by rubber tubing, after valve enters desiccant layer in the tube, be connected to the lower end valve of gas meter with rubber tubing by the valve on top, open the under meter needle valve, nitriding gas inserts ion-nitriding furnace by the upper end valve with rubber tubing after by needle valve and Glass tubing.
Summary of the invention:
The objective of the invention is to be provides a kind of air/gasoline ion multi element copermeation technology of steel at above-mentioned the deficiencies in the prior art, utilizes this technology that steel is carried out ion multi element copermeation, solves ammonia to the pollution of environment and the problem that reduces cost.
In order to realize the foregoing invention purpose, the present invention's step in the following order carries out:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 50～120Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of anode and cathode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.1～0.6m
3/ h and 0.00006～0.06m
3/ h air and gasoline are heated to 500～580 ℃ by glow discharge with workpiece with 50～100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 0.5～60 hour, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 50～150 ℃ with 50～100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
The present invention compared with prior art has following technique effect:
Compare with the conventional ion nitriding, main application of air of air/gasoline ion multi element copermeation technology and small quantities of gasoline, pollution-free without ammonia, nitrogen and hydrogen, reduced production cost 10%.
Description of drawings:
Fig. 1 makes the air/gasoline ion multi element copermeation technology airing system synoptic diagram of nitriding source of the gas for air;
Fig. 2 is respectively 0.6m for the 40Cr steel with flow
3/ h and 0.0003m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 3 is respectively 0.5m for the 40Cr steel with flow
3/ h and 0.00024m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 4 is respectively 0.4m for the 40Cr steel with flow
3/ h and 0.00018m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 5 is respectively 0.3m for the 40Cr steel with flow
3/ h and 0.00012m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 6 is that 45 steel are respectively 0.3m with flow
3/ h and 0.0006m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 7 is that 45 steel are respectively 0.4m with flow
3/ h and 0.0003m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
Fig. 8 is that 45 steel are respectively 0.5m with flow
3/ h and 0.00024m
3The air of/h and the gasoline microhardness graphic representation after this invented technology is handled;
In Fig. 1,1 is storage tanker, and 2,3 and 4 is under meter, and 5 is drying bottle, and 6 are the ionitriding body of heater, and 7 is workpiece, and 8 is cathode disc.In Fig. 2～8, X-coordinate is represented the distance from the surface, and ordinate zou is represented hardness value (HV
0.2)
Embodiment:
The air/gasoline ion multi element copermeation technology of embodiment 1:40Cr steel
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of anode and cathode input 10～1000V, break up after the arc rareness again straightening stream voltage until not beating or break up less arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.6m
3/ h and 0.0003m
3The air of/h and gasoline are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 2:40Cr steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m
3/ h and 0.00024m
3The air of/h and gasoline are heated to 540 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 3:40Cr steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.4m
3/ h and 0.00018m
3The air of/h and gasoline are heated to 560 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 4:40Cr steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.3m
3/ h and 0.00012m
3The air of/h and gasoline are heated to 580 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 5:45 steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.3m
3/ h and 0.0006m
3The air of/h and gasoline are heated to 500 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 6:45 steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.4m
3/ h and 0.0003m
3The air of/h and gasoline are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
The air/gasoline ion multi element copermeation technology of embodiment 7:45 steel
(1) (2) (3) step is identical with (1) (2) (3) step of embodiment 1;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m
3/ h and 0.00024m
3The air of/h and gasoline are heated to 540 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, with speed furnace cooling to the 100 ℃ blowing out of 100 ℃/h, treated work-piece cools blow-on taking-up workpiece after the room temperature.
Claims (8)
1. the air/gasoline ion multi element copermeation technology of a steel, it is characterized in that this technology in the following order step carry out:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 50～120Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable dc voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.1～0.6m
3/ h and 0.00006～0.06m
3The air of/h and gasoline are heated to 500～580 ℃ by glow discharge with workpiece with 50～100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 0.5～60 hour, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 50～150 ℃ with 50～100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
2. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 40Cr steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.6m
3/ h and 0.0003m
3The air of/h and gasoline are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
3. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 40Cr steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m
3/ h and 0.00024m
3The air of/h and gasoline are heated to 540 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
4. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 40Cr steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.4m
3/ h and 0.00018m
3The air of/h and gasoline are heated to 560 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
5. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 40Cr steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.3m
3/ h and 0.00012m
3The air of/h and gasoline are heated to 580 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
6. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 45 steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.3m
3/ h and 0.0006m
3The air of/h and gasoline are heated to 500 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
7. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 45 steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.4m
3/ h and 0.0003m
3The air of/h and gasoline are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
8. according to the steel air/gasoline ion multi element copermeation technology described in the claim 1, it is characterized in that the air/gasoline ion multi element copermeation technology of 45 steel carries out according to the following steps:
(1), places on the cathode disc with the workpiece cleaning after modified, drying;
(2) close body of heater, will be evacuated in the ion-nitriding furnace to 100Pa with mechanical pump;
(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V, break up after the arc rareness again straightening stream voltage until stopping to break up arc by power supply;
(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m
3/ h and 0.00024m
3The air of/h and gasoline are heated to 540 ℃ by glow discharge with workpiece with 100 ℃/hour speed;
(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100571189A CN100365156C (en) | 2005-06-14 | 2005-06-14 | Air/gasoline ion multi element copermeation technology of steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100571189A CN100365156C (en) | 2005-06-14 | 2005-06-14 | Air/gasoline ion multi element copermeation technology of steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1718837A CN1718837A (en) | 2006-01-11 |
| CN100365156C true CN100365156C (en) | 2008-01-30 |
Family
ID=35930784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100571189A Expired - Fee Related CN100365156C (en) | 2005-06-14 | 2005-06-14 | Air/gasoline ion multi element copermeation technology of steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100365156C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102485933A (en) * | 2010-12-02 | 2012-06-06 | 大连新氏传动科技有限公司 | Nitridation method |
| CN102108481A (en) * | 2011-03-17 | 2011-06-29 | 中国铁道科学研究院金属及化学研究所 | Plasma multi-component cementation method |
| CN110359009B (en) * | 2019-08-08 | 2021-06-08 | 江苏良川科技发展有限公司 | Multi-gas co-permeation strengthening system and process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3831100A1 (en) * | 1987-09-19 | 1989-03-30 | Volkswagen Ag | Process for producing nitrogen diffusion layers in edge zones of iron-containing workpieces |
| JPH04141573A (en) * | 1990-09-28 | 1992-05-15 | Nippon Denshi Kogyo Kk | Production of nitrided steel |
| CN1556243A (en) * | 2004-01-09 | 2004-12-22 | 重庆大学 | Air ion cxygen nitrogen coinfiltration technology of ferrous metal |
-
2005
- 2005-06-14 CN CNB2005100571189A patent/CN100365156C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3831100A1 (en) * | 1987-09-19 | 1989-03-30 | Volkswagen Ag | Process for producing nitrogen diffusion layers in edge zones of iron-containing workpieces |
| JPH04141573A (en) * | 1990-09-28 | 1992-05-15 | Nippon Denshi Kogyo Kk | Production of nitrided steel |
| CN1556243A (en) * | 2004-01-09 | 2004-12-22 | 重庆大学 | Air ion cxygen nitrogen coinfiltration technology of ferrous metal |
Non-Patent Citations (2)
| Title |
|---|
| 快速离子氮化渗氮层相组成和微观组织形貌研究. 钟厉等.宇航材料工艺，第1期. 2003 * |
| 离子渗氮技术的进展. 高仰之等.机械工人（热加工），第7期. 2003 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1718837A (en) | 2006-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100365156C (en) | Air/gasoline ion multi element copermeation technology of steel | |
| CA2528691A1 (en) | Fuel cell, operating method thereof, sintering furnace, and power generator | |
| CN106937470A (en) | Heating means, heater and application based on plasma arc | |
| CN107620031A (en) | Austenitic stainless steel nitrogen treatment system and method based on hollow cathode ion source | |
| CN101851736A (en) | Environment-friendly nitrogen-enriched layer rapid nitriding treatment method | |
| CN105112617A (en) | Novel high-temperature annealing process of cold-rolled oriented silicone steel | |
| CN101122004A (en) | Vacuum surface strengthening technique and device | |
| CN100387748C (en) | Air/carbon hydrogen organic gaseous ion nitrogen, carbon, oxygen coinfusion technology of steel | |
| CN101525698A (en) | Method for preparing high-purity nickel ingot | |
| CN103334078B (en) | ion nitriding furnace | |
| CN103789722B (en) | One significantly improves the corrosion proof chemical heat treatment method of gear | |
| CN201082898Y (en) | Vacuum surface strengthening device | |
| CN1556243A (en) | Air ion cxygen nitrogen coinfiltration technology of ferrous metal | |
| CN102534221A (en) | Technology for recycling scrap copper in high-temperature vacuum nitrogen-charging cycle smelting manner | |
| CN107619911B (en) | A kind of energy saving heat-treatment furnace | |
| CN101139694A (en) | Steel air-ethanol ionic oxynitrocarburizing process | |
| CN202148344U (en) | Nitrogen ion generating device for metal surface nitriding | |
| CN104942301A (en) | Technology for producing nickel raw material for stainless steel by nickelous hydroxide | |
| CN1138019C (en) | Normal-pressure non-equilibrium plasma equipment and technology for reinforcement of metal surface | |
| CN201686739U (en) | Ion nitriding furnace | |
| CN112063964A (en) | Energy-saving and environment-friendly stainless steel surface hardening process method | |
| US8357224B2 (en) | Method of iron smelting in blast furnace with high temperature coal Gas | |
| CN215516655U (en) | Graphite powder high temperature purification device | |
| CN1789477A (en) | Energy-saving ion nitrifying furnace | |
| CN2760046Y (en) | Energy-saving ion nitriding furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |