CN102031462B - High manganese austenitic iron-based alloy containing boron - Google Patents
High manganese austenitic iron-based alloy containing boron Download PDFInfo
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Abstract
The invention relates to a high manganese austenitic iron-based alloy containing boron and a thermal processing method thereof. The alloy comprises the following chemical components of: 0.15-0.40% of C, 0.5-1.5% of Si, 8.0-14.0% of Mn, 15-22% of Cr, 1.5-3.5% of Ni, 0.3-0.55% of Nb, 0.4-0.5% of N+B and the balance being F2 and inevitable impurities. The normal temperature hardness of a cast alloy of the alloy melted by an electric furnace and shaped by centrifugally casting is up to 25-30 HRC; the room temperature extension strength is up to 700-720 MPa; the impact tenacity is up to more than 22 J/cm<2>; the corrosion resisting life is improved by 2.5-3 times more than a 316L stainless steel. Furthermore, the invention provides a thermal processing method for improving the corrosion resistance of the alloy, comprising the following steps of: completely solidly dissolving and separating secondary boride compounds in the issue via the high temperature solidly dissolving treatment and the annealing treatment so that the corrosion resisting life of the alloy is improved to more than 13 times than the 316 L stainless steel. The alloy has excellent liquid metal corrosion resistance and can be used for processing various key members for machining thermal dipping zincing production lines such as sinking rollers, shaft sleeves, bearing bushes, support arms and the like.
Description
Technical field
The present invention relates to the steel and alloy technical field, specifically, relate to a kind of high manganese austenite ferrous alloy of corrosion boracic and heat treating method thereof of anti-liquid metal corrosion.
Background technology
At present, steel product galvanizing technology is to prevent the most economical effective means of iron and steel corrosive in physical environment, after the workpiece pot galvanize; Its solidity to corrosion can improve 11-28 doubly; Simultaneously owing to have good bonding force between coated metal and the matrix, and can increase ornamental and plasticity, therefore be widely used in the processing and the manufacturing processed of plate, band, silk, pipe, net and hardware appliance; Its concrete method is pending iron and steel parts to be placed 450-480 ℃ zinc pot; Take out after staying for some time, but liquid zinc has the intensive corrosion, therefore require the processing unit of long-term contact liquid zinc to have advantages of good anticorrosion performance.
Countries in the world; Comprise on the continuous hot-dipping galvanizing production line of main iron and steel enterprise of China and all use the sinking roller arrangement; Comprise the sinking roller that is sunken in the zinc liquid, stablize roller and support arm thereof, axle sleeve and skewed slot etc. down; In general these parts, except that axle sleeve, watt etc. use cobalt base alloy Stellite6B makes, all the other 316L of use stainless materials are made more.
Although 316L is an austenite structure, its 450-480 ℃ hot strength and hardness are not enough, and therefore in use the body of roll is easy to generate flexural deformation; Make galvanized sheet emersion wave shape wave, thereby reduce galvanized sheet quality and grade that 316L stainless steel sinking roller Zn solution corrosion resistance can be not high enough in addition; Repair for 1st time work-ing life is at 20-30 days, and the frequent change and the maintenance of sinking roller and axle sleeve had both reduced the operating rate of pot galvanize unit; Increase the zinc consumption again, thereby improved the cost of product.
Therefore, be necessary to develop a kind of corrosive of the zinc of anti-liquid better alloy material.
Summary of the invention
The purpose of this invention is to provide high manganese austenite ferrous alloy of a kind of zinc of anti-liquid corrosive boracic and heat treating method thereof.
The high manganese austenite ferrous alloy of boracic of the present invention is through austenitic steel design and control, carries out austenitizing in the hope of obtaining the full austenite alloy structure with (Mn+Ni+C+N) polynary combination.
Concrete, the chemical ingredients of the high manganese austenite ferrous alloy of described boracic consists of (weight %): C:0.15%-0.40%; Si:0.5%-1.5%; Mn:8.0%-14.0%; Cr:15%-22%; Ni:1.5%-3.5%; Nb 0.3%-0.55%, N+B 0.4-0.5%, surplus is Fe and unavoidable impurities.
In addition, can through microalloying further improve alloy according to the invention Zn solution corrosion resistance can, therefore alloy according to the invention can also contain among alloying element: Ti and the Zr one or both; Its weight percent is respectively 0.05%-0.8% and 0.03%-0.12%.
The present invention limits various alloy elements and the reasons are as follows:
C:C is the stable austenite element, also is the main forming element of carbide (Cr7C3, NbC), and the C amount is decided to be the upper limit 0.40%, crosses to promote Fe and Zn reflection at most, and is unfavorable to solidity to corrosion;
Si:Si is the melting deoxidant element, when Si content surpasses 0.5%, just works as alloying element, and the Si content zinc of anti-liquid corrosive power when 0.5-1.5% is better, and＞1.5%Si is unfavorable for that the alloy flexible keeps;
Mn:Mn is the austenitic alloy element, is fully austenitic structure for keeping alloy of the present invention, and 8% is lower limit, and ferritic structure will appear in content＜8%, can be unfavorable to the Zn solution corrosion resistance that guarantees steel; In addition, test that the present invention did confirms that the Mn of content＞14% is totally unfavorable to the zinc of anti-liquid corrosion, and is linear velocity and increases, therefore set Mn content on be limited to 14%;
Cr:Cr improves the zinc of anti-liquid corrosive main alloy element, keeps 15% to be minimum requirements; Cr also is the forming element of Cr7C3 carbide in addition, and ferritic phase appears in too high Cr easily in alloy substrate, and the impelling strength to alloy decreases in addition, and therefore the upper limit with Cr content is defined as 22%;
Ni:Ni also is the austenitic alloy element, because the metallographic structure of alloy of the present invention need be designed to austenite, but in liquid zinc, Ni and Zn react, and very easily generate unsettled NiZn
8Phase, and this phase constitution is prone to and liquid zinc further reacts, so ni content is too high, totally unfavorable to the zinc of anti-liquid corrosion, controlling Ni content thus is that 1.5%-3.5% is advisable;
Nb:Nb is a carbide forming element, and NbC can improve the hardness of austenite structure, and it is useful that gold alloy solder is connect performance, reduces alloy toughness at most but add, and therefore controls Ni content and is advisable for＜0.55%;
N:N also is of value to the invention alloy and keeps fully austenitic structure, and the N and the nitride that are dissolved in matrix can improve alloy strength and hardness, but add-on is too much, controls defectives such as bad easy generation pore, therefore controls N content and is advisable for＜0.95%;
B: micro-B ability filler alloys grain boundary defects, improve solidity to corrosion, but add-on is crossed the boride of high energy in crystal boundary formation net distribution, therefore controls B content and is advisable for＜0.95%;
In addition, can be with alloy of the present invention through quench hot, or further temper is broken off netted boride to be disperse and is distributed, and promotes FeB → Fe
2B changes, and the Zinc-corrosion resistant performance is significantly improved;
Ti: very easily generate TiC, crystal grain thinning with improve intensity and hardness, yet add-on excessive be prone to generate be mingled with, therefore control its content and between 0.05-0.8%, be advisable;
But Zr:Zr is crystal grain thinning both, improves the alloy obdurability, can be filled in crystal boundary again and improve the Zn solution corrosion resistance ability, therefore is controlled between the 0.03-0.12% and is advisable.
Alloy of the present invention can use electrosmelting, preferably adopts the medium-frequency induction furnace melting; Casting preferably adopts the centre spinning method moulding then.
The normal temperature hardness of the cast alloy of alloy according to the invention reaches 25-30HRC, and room temperature tensile intensity reaches 700-720Mpa, and impelling strength can reach 22J/cm
2More than.
For further improving the zinc of the anti-liquid corrosive power of alloy according to the invention, said alloy can carry out following thermal treatment: get said cast alloy, 1050 ℃ of-1150 ℃ of oil quenchings or shrends;
Also can carry out following thermal treatment: get said cast alloy, 1050 ℃ of-1150 ℃ of oil quenchings or shrends, 450 ℃ of tempering, air cooling fast;
Above-mentioned thermal treatment all can further improve the Zn solution corrosion resistance ability of alloy according to the invention.The corrosion-resistant life of the cast alloy of alloy according to the invention improves 2.5-3 doubly than 316L stainless steel.Handle through above-mentioned high temperature solid solution, or further after the temper, can make the abundant solid solution of secondary boride and separate out, thereby further improve the Zn solution corrosion resistance ability, under similarity condition, the corrosion-resistant life of alloy is brought up to more than 13 times than 316L stainless steel.
Alloy of the present invention can be used for anti-solution stopping zinc corrosion, and specifically, said alloy can be used as the key part of galvanizing production line, like sinking roller, axle sleeve, bearing shell, support arm etc.
The present invention has proposed the high manganese austenite ferrous alloy of a kind of zinc of anti-liquid corrosive boracic through the content of adjustment alloying element, and the normal temperature hardness of its cast alloy reaches 25-30HRC, and room temperature tensile intensity reaches 700-720MPa, and impelling strength can reach 22J/cm
2More than, corrosion-resistant life improves 2.5-3 doubly than 316L stainless steel; And as carry out further high temperature solid solution and handle and temper, make the abundant solid solution of secondary boride and separate out, the corrosion-resistant life of alloy according to the invention will be brought up to more than 13 times than 316L stainless steel.Obviously, the intensity of alloy of the present invention and Zn solution corrosion resistance can surpass the 316L stainless steel comprehensively, can be widely used in the zinc of anti-liquid corrosive parts.
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Embodiment 1
The melting and cast slab in 10 kilograms of vacuum induction furnaces of the listed alloy composition of according to the form below.Cut and be processed into impact then, stretch and 15 * 10 * 5mm corrosion sample.Wherein corrosion test is carried out in the plumbago crucible of well formula resistance furnace.Liquid zinc is heated to 450 ℃, adopts the mode of soaking entirely.Through behind continuous seven days (168 hours) static corrosion tests, measure the average corrosion depth (being the mean thickness loss of sample) of sample.
But by the zinc of the anti-liquid corrosive power of last table knowledge capital invention alloy example one is 2.5 times of 316L, and the zinc of the anti-liquid corrosive power of invention alloy example two is 3.5 times of 316L casting alloy.The zinc of the anti-liquid corrosive power of invention alloy example three is 13.5 times of 316L, and the zinc of the anti-liquid corrosive power of invention alloy example four is 5.5 times of 316L.
Alloy over-all properties of the present invention is good, and normal temperature hardness reaches 25-30HRC, and room temperature tensile intensity reaches 700-720MPa, and impelling strength can reach more than the 22J/cm2.Alloy of the present invention is produced as parts such as roller spare and axle sleeves in the medium-sized pot galvanize of part, has obtained to be superior to the stainless good result of 316L.
Embodiment 2
The melting and cast slab in 10 kilograms of vacuum induction furnaces of the listed alloy composition of according to the form below.Cut and be processed into impact then, stretch and 15 * 10 * 5mm corrosion sample.Wherein corrosion test is carried out in the plumbago crucible of well formula resistance furnace.Liquid zinc is heated to 450 ℃, adopts the mode of soaking entirely.Through behind continuous seven days (168 hours) static corrosion tests, measure the average corrosion depth (being the mean thickness loss of sample) of sample.
But by the zinc of the anti-liquid corrosive power of last table knowledge capital invention alloy example one is 3 times of 316L, and the zinc of the anti-liquid corrosive power of invention alloy example two is 3.8 times of 316L casting alloy.The zinc of the anti-liquid corrosive power of invention alloy example three is 10 times of 316L, and the zinc of the anti-liquid corrosive power of invention alloy example four is 6 times of 316L.
Alloy over-all properties of the present invention is good, and normal temperature hardness reaches 25-30HRC, and room temperature tensile intensity reaches 700-720MPa, and impelling strength can reach more than the 22J/cm2.Alloy of the present invention is produced as parts such as roller spare and axle sleeves in the medium-sized pot galvanize of part, has obtained to be superior to the stainless good result of 316L.
Claims (6)
1. high manganese austenite ferrous alloy of boracic, its chemical ingredients consists of the component of following weight percentage ratio: C:0.15%-0.40%; Si:0.5%-1.5%; Mn:8.0%-14.0%; Cr:15%-22%; Ni:1.5%-3.5%; Nb 0.3%-0.55%, N+B 0.4-0.5%, surplus is Fe and unavoidable impurities.
2. alloy as claimed in claim 1 is characterized in that, said alloy also contains among Ti and the Zr one or both, and its weight percent is respectively 0.05%-0.8% and 0.03%-0.12%.
3. claim 1 or 2 described heat treatment of alloy methods is characterized in that, get the cast alloy of said alloy, 1050 ℃ of-1150 ℃ of oil quenchings or shrends.
4. claim 1 or 2 described heat treatment of alloy methods is characterized in that, get the cast alloy of said alloy, 1050 ℃ of-1150 ℃ of oil quenchings or shrends, 450 ℃ of tempering, air cooling fast.
5. according to claim 1 or claim 2 the application of alloy aspect the zinc of anti-liquid corrosion.
6. application as claimed in claim 5 is characterized in that, said alloy is used as the parts of the galvanizing production line that comprises sinking roller, axle sleeve, bearing shell, support arm.
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| CN103300707A (en) * | 2013-06-20 | 2013-09-18 | 常熟金浩机械有限公司 | Manufacturing method of inclination prevention wok |
| CN103614659A (en) * | 2013-10-22 | 2014-03-05 | 芜湖市鸿坤汽车零部件有限公司 | An austenite alloy steel material used for an internal combustion engine and a preparation method of the alloy steel material |
| CN104294268B (en) * | 2014-09-06 | 2016-10-26 | 北京工业大学 | A kind of wear-resisting deflector roll preparation method |
| CN104674129B (en) * | 2015-01-31 | 2017-09-12 | 湘潭大学 | A kind of ferrous alloy of liquid zinc corrosion resistant and preparation method thereof |
| CN106011690B (en) * | 2016-06-12 | 2018-03-09 | 安徽固齐线路器材有限公司 | A kind of process of surface treatment of anticorrosive shockproof hammer |
| CN107605320A (en) * | 2017-11-09 | 2018-01-19 | 台山平安五金制品有限公司 | A kind of high intensity safety box austenitic alloy material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1240839A (en) * | 1998-07-02 | 2000-01-12 | 尤吉纳股份有限公司 | Corrosion-resistant low-nickel austenitic stainless steel |
| CN101545078A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1240839A (en) * | 1998-07-02 | 2000-01-12 | 尤吉纳股份有限公司 | Corrosion-resistant low-nickel austenitic stainless steel |
| CN101545078A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Nickel saving type metastable austenite stainless steel with excellent normal temperature mechanical property |
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