CN102051572A - Surface boronizing treatment method of steel piece - Google Patents
Surface boronizing treatment method of steel piece Download PDFInfo
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- CN102051572A CN102051572A CN2011100074196A CN201110007419A CN102051572A CN 102051572 A CN102051572 A CN 102051572A CN 2011100074196 A CN2011100074196 A CN 2011100074196A CN 201110007419 A CN201110007419 A CN 201110007419A CN 102051572 A CN102051572 A CN 102051572A
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Abstract
The invention discloses a surface boronizing treatment method of a steel piece. The method sequentially comprises the following steps of: (1) material proportioning: proportioning 88 weight percent of borax pentahydrate, 10 weight percent of Na2CO3 and 12 weight percent of silicon carbide, wherein the total quantity is determined according to the size and the shape of a steel piece and preferential to meet the requirement that a molten pool formed after melting can submerge the steel piece; (2) material melting and molten pool forming: putting the borax pentahydrate into a stainless steel container, and heating up to 650 DEG C; adding SiC powder and stirring; after the borax is completely molten and the temperature of the molten reaches 800 DEG C, adding Na2CO3; strengthening the stirring until the temperature of the molten pool reaches 930 DEG C, putting the steel piece required to be boronized into a borax bath for boronizing; constantly keeping the temperature of the molten pool to be 930 DEG C for longer than 3 hours; and (3) taking the steel piece out, naturally cooling to normal temperature, and then carrying out treatments of quenching, tempering and polishing before use. In the method, a high-hardness piece surface can be obtained through boronizing the piece surface, and the hardness of the surface after boronizing can be higher than 1,200HV, so that the wear resistance of the steel piece is greatly improved; and the wear resistance of the steel piece can be improved by 2.5-3.0 times when the hardness is improved by every 100HV.
Description
Technical field
The invention belongs to the surface boronizing treatment process of the heat treating method of steel, particularly steel part.
Background technology
Steel workpiece is placed in the medium that can produce certain element atom, is heated to certain temperature, stop reasonable time, change the composition and the tissue of workpiece surface thereby cool down subsequently, this technological process is called as the thermo-chemical treatment of steel.
The chemical conversion treatment of steel, present sophisticated technology can also carbonitridings based on carburizing and nitriding.Carburizing, nitriding and carbonitriding are workpiece to be placed in the gas phase that physical-chemical reaction takes place finish.
The carburizing of steel: for example gear, cam, ratchet etc. have particular requirement to its performance, and promptly the surface of steel part not only has high hardness and wear resistance, possesses high impelling strength simultaneously.If make than higher steel,, be difficult to satisfy the needs of high tenacity though the surface hardness of steel and wear resisting property reach requirement with carbon content.If the result is just in time opposite with the soft steel gained.But make part with soft steel or low-carbon alloy structural steel, improve case case carbon thereafter, pass through suitable chemical surface carburizing treatment again, just can reach above-mentioned performance requriements.The carburizing of steel comprises solid carburizing and gas cementation.Carburizing is owing to carry out under high temperature (900～950 ℃), and process duration is long, is difficult to avoid the crystal grain of steel thick, so converted steel (the normalizing)+temper of need quenching.
The nitriding of steel: nitriding is the process of the top layer absorbed nitrogen atom of steel, workpiece is placed on encloses container (adds NH in the container
3) middle heating NH
3=3H
2+ 2N(reversible reaction), along with difference (500～650 ℃) NH of temperature
3Rate of decomposition 15～60%.Nitrogen and iron form Fe
2N, Fe
4N and nitrogenous ferrite, the desalination layer has corrosion resistance to air, fresh water, superheated vapour, but the workpiece easy deformation after the nitriding needs reconditioning once more.
Summary of the invention
The object of the present invention is to provide a kind of surface boronizing treatment process of steel part, can either make steel piece surface have higher hardness, can improve the wear resisting property and the toughness of steel piece surface again.
The object of the present invention is achieved like this: a kind of surface boronizing treatment process of steel part, this method comprises the following steps: 1. material proportions successively: Borax pentahydrate is 88%, Na
2CO
3Be 10%, silicon carbide is 12%, and above proportioning is a mass percent, and total amount can be flooded steel part with the molten bath of melting back formation and be advisable according to the size and the shape of steel part; 2. material melting and bath form: at first Borax pentahydrate is put into a stainless steel vessel, be heated to 650 ℃, add the SiC powder then and stir, treat that borax melts fully, when the bath temperature reaches 800 ℃, add Na again
2CO
3, strengthen being stirred to the bath temperature and reach 930 ℃, the steel part that needs boronising is placed into boronising in the borax bath, the bath temperature keeps 930 ℃ of constant temperature, and the time was greater than 3 hours; 3. the taking-up steel part naturally cools to normal temperature, and---tempering---reconditioning of then steel part being quenched is handled, and can use.
In the methods of the invention,In borax, add a certain amount of SiC powder and make its quick dissolving.Add a certain amount of Na in the borax after the dissolving
2CO
3, quicken borax (Na
2OB
xO
y) decompose fast.By test, determine steel part boronising raw material composition and best proportioning, mass percent: borax content 88%, Na
2CO
3Content 10%, SiC powder content 12%.By test, the optimum temps of having determined the steel part boronising is 930 ℃.Obtained the steel part boronising speed under the optimum temps, steel part soaked 3 hours in 930 ℃ of fused borax baths, and [B] in the solution can infilter the thickness of steel piece surface 0.2mm.
The inventive method obtains the steel piece surface of high rigidity by the workpiece surface boronising, steel part boronising rear surface hardness can reach 1200HV above (carburizing can reach 800HV), increased substantially the wear resistance of steel part, every raising 100 HV of hardness, the wear resistance of steel part can improve 2.5～3.0 times.The steel that this method is handled, the steel construction piece that is particularly useful for using under the complex working condition condition, steel casting etc. have high rigidity, high good performances such as wear resistance.Can be widely used in the quiet mill of requirement and examine the workpiece that condition is used, for example axletree, gear etc. are asked the every field of high rigidity, high-wearing feature steel part.
Embodiment
A kind of surface boronizing treatment process of steel part, this method comprises the following steps: 1. material proportions successively: Borax pentahydrate is 88%, Na
2CO
3Be 10%, silicon carbide is 12%, and above proportioning is a mass percent, and total amount can be flooded steel part with the molten bath of melting back formation and be advisable according to the size and the shape of steel part; 2. material melting and bath form: at first Borax pentahydrate is put into a stainless steel vessel, be heated to 650 ℃, add the SiC powder then and stir, treat that borax melts fully, when the bath temperature reaches 830 ℃, add Na again
2CO
3, strengthen being stirred to the bath temperature and reach 930 ℃, the steel part that needs boronising is placed into boronising in the borax bath, the bath temperature keeps 930 ℃ of constant temperature, 6 hours time; 3. the taking-up steel part naturally cools to normal temperature, and---tempering---reconditioning of then steel part being quenched is handled, and can use.
Claims (1)
1. the surface boronizing treatment process of a steel part, it is characterized in that: this method comprises the following steps: 1. material proportions successively: Borax pentahydrate is 88%, Na
2CO
3Be 10%, silicon carbide is 12%, and above proportioning is a mass percent, and total amount can be flooded steel part with the molten bath of melting back formation and be advisable according to the size and the shape of steel part; 2. material melting and bath form: at first Borax pentahydrate is put into a stainless steel vessel, be heated to 650 ℃, add the SiC powder then and stir, treat that borax melts fully, when the bath temperature reaches 800 ℃, add Na again
2CO
3, strengthen being stirred to the bath temperature and reach 930 ℃, the steel part that needs boronising is placed into boronising in the borax bath, the bath temperature keeps 930 ℃ of constant temperature, and the time was greater than 3 hours; 3. the taking-up steel part naturally cools to normal temperature, and---tempering---reconditioning of then steel part being quenched is handled, and can use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100074196A CN102051572A (en) | 2011-01-14 | 2011-01-14 | Surface boronizing treatment method of steel piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100074196A CN102051572A (en) | 2011-01-14 | 2011-01-14 | Surface boronizing treatment method of steel piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102051572A true CN102051572A (en) | 2011-05-11 |
Family
ID=43956364
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|---|---|---|---|
| CN2011100074196A Pending CN102051572A (en) | 2011-01-14 | 2011-01-14 | Surface boronizing treatment method of steel piece |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014607A (en) * | 2012-11-26 | 2013-04-03 | 姚芙蓉 | Preparation and application method of carbon steel boriding agent |
| CN104911535A (en) * | 2015-06-26 | 2015-09-16 | 中南大学 | Boronizing agent for titanium surface solid boronizing and boronizing process |
| CN106148970A (en) * | 2015-04-16 | 2016-11-23 | 宁波金特信钢铁科技有限公司 | A kind of piercing plug for seamless steel tubes surface infiltration layer technique |
| CN108796426A (en) * | 2017-09-27 | 2018-11-13 | 深圳市金胜金属技术有限公司 | A kind of superhard treatment process of metal surface boronising |
| CN115125477A (en) * | 2022-06-29 | 2022-09-30 | 常州铂林热处理有限公司 | A kind of composite nitriding heat treatment process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105832A (en) * | 1985-08-02 | 1986-06-10 | 兰州炼油厂机械厂 | Superalloy salt bath boronizing agent and preparation method thereof |
| CN1081209A (en) * | 1992-07-06 | 1994-01-26 | 机械电子工业部洛阳拖拉机研究所 | New particulate boronizing agent and compound method |
| CN1603452A (en) * | 2004-10-29 | 2005-04-06 | 武汉理工大学 | Rapid preparation method of boronizing layer on metal surface |
| CN101748356A (en) * | 2010-01-12 | 2010-06-23 | 张云江 | Economical boriding_nitrocarburizing agent |
-
2011
- 2011-01-14 CN CN2011100074196A patent/CN102051572A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105832A (en) * | 1985-08-02 | 1986-06-10 | 兰州炼油厂机械厂 | Superalloy salt bath boronizing agent and preparation method thereof |
| CN1081209A (en) * | 1992-07-06 | 1994-01-26 | 机械电子工业部洛阳拖拉机研究所 | New particulate boronizing agent and compound method |
| CN1603452A (en) * | 2004-10-29 | 2005-04-06 | 武汉理工大学 | Rapid preparation method of boronizing layer on metal surface |
| CN101748356A (en) * | 2010-01-12 | 2010-06-23 | 张云江 | Economical boriding_nitrocarburizing agent |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014607A (en) * | 2012-11-26 | 2013-04-03 | 姚芙蓉 | Preparation and application method of carbon steel boriding agent |
| CN106148970A (en) * | 2015-04-16 | 2016-11-23 | 宁波金特信钢铁科技有限公司 | A kind of piercing plug for seamless steel tubes surface infiltration layer technique |
| CN104911535A (en) * | 2015-06-26 | 2015-09-16 | 中南大学 | Boronizing agent for titanium surface solid boronizing and boronizing process |
| CN108796426A (en) * | 2017-09-27 | 2018-11-13 | 深圳市金胜金属技术有限公司 | A kind of superhard treatment process of metal surface boronising |
| CN115125477A (en) * | 2022-06-29 | 2022-09-30 | 常州铂林热处理有限公司 | A kind of composite nitriding heat treatment process |
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Application publication date: 20110511 |