CN100374607C - Tungsten-containing high manganese steel for wear-resistant casting - Google Patents
Tungsten-containing high manganese steel for wear-resistant casting Download PDFInfo
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- CN100374607C CN100374607C CNB2005100419923A CN200510041992A CN100374607C CN 100374607 C CN100374607 C CN 100374607C CN B2005100419923 A CNB2005100419923 A CN B2005100419923A CN 200510041992 A CN200510041992 A CN 200510041992A CN 100374607 C CN100374607 C CN 100374607C
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Abstract
The present invention discloses tungsten-containing high-manganese steel for an abrasion resistant casting. The tungsten-containing high-manganese steel is characterized in that the tungsten-containing high-manganese steel comprises raw materials of the following weight ratio: 0.95 to 1.35% of C, 11.5 to 14% of Mn, 0.3 to 1.0% of Si, 0.2 to 1.0% of Cr, 0.2 to 0.6% of W, 0.2 to 0.4% of Mo, at most 0.07% of P and Fe as the rest; or the content of W is from 3.5 to 4.2% or 0.7 to 2.0%, and no Mo is contained. 0.02 to 0.15% of rare earth element Re can also be added into the tungsten-containing high-manganese alloy steel. As indicated by the results of simulating component impact bending tests, mechanical property tests and on-site use tests, the strength and the toughness of the steel can be enhanced obviously by adding W in the high-manganese steel. W is cooperated with other alloy elements to take a favorable integration effect. Compared with common high-manganese steel, the tungsten-containing high-manganese steel has much higher performance. By contrasting two kinds of high-manganese steel containing the same amount of W and Mo (two portions of W are equivalent to one portion of Mo), the mechanical performance and the service life of the two kinds of high-manganese steel are all square, and the cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of steel alloy that is used to cast, particularly a kind of high manganese steel containing tungsten that is used for the wear resistance castings that broken metal (black and coloured) nonmetal (stone, coal, cement clinker etc.) machinery uses.
Background technology
In developed countries such as America and Europes, junked-auto reclaims enormous amount.After the recovery, common way is, takes out individual parts such as storage battery, and automobile is flattened, and integral body is sent in the crusher, knocks repeatedly with the tup of high speed rotating, is broken into the foundry returns that steel mill uses.This type of machine also is widely used in broken other black and non-ferrous metal, and nonmetal (stone, coal, cement clinker etc.).
For example: at four types bigger crusher of U.S.'s sales volume, rotating speed is respectively RPM720,600,514,450.Machine is big more, and rotating speed is low more.This rotating speed is meant that many axles installing tup center on the rotating speed at crushing chamber center.During the axle revolution, tup is rotation on axle.
External expert calculates the centrifugal force of the tup of high speed rotating, is example with the little tup of 90KG, reaches more than 300 ton.So big centrifugal force is pounded on broken thing, reacts on tup, and what make that it bears is gouging abrasion.In crusher, the tup of 90kg still belongs to little, big tup can reach 900 pound weights, is roughly equal to 400kg.Tup has been proposed higher requirement with material.
As everyone knows, high mangaenese steel is under big impact load, and the surface produces cold working hardening, form the upper layer of high abrasion, and the internal layer austenite is still keeping good toughness.But learn that from the domestic production enterprise that this type of tup is provided to the U.S. toughness of common high mangaenese steel still is not enough to satisfy the requirement of foundry goods such as tup, must in high mangaenese steel, add Mo.E-2 chemical ingredients among the U.S. ASTM A 128/A128M is to add 1.8-2.1%Mo in the high mangaenese steel; The high mangaenese steel that contains Mo is also arranged in the US enterprise standard.Because molybdenum can improve the tendency of austenite along the dentrite development when the steel condensation, and can improve austenitic stability, suppressing separating out of carbide eliminates the carbide network on the crystal boundary and forms bulk and granular carbide and crystal grain thinning, but solution strengthening austenite also, thereby obviously improve the toughness of high mangaenese steel.Above-mentioned domestic enterprise is by the casting high mangaenese steel tup that contains Cr, Mo of US enterprise standard production, the use of succeeing on U.S. home-made crusher, and the random device various places that distribute all over the world.The High Manganese Steel Casting that tup etc. contain molybdenum has become the outlet pillar product of this enterprise.
But the price of molybdenum is more expensive.Particularly China raw material market price is progressively in line with international standards in recent years, and the domestic price of molybdenum is no longer far below the world market valency, and domestic in addition steel scrap valency goes up, and the advantage of enterprise on the prices of raw and semifnished materials almost exhausted.Oil price soars and climbing sharply and electrovalent rise of the domestic trade that causes and international ocean shipping price significantly reduces the competitive power of product on markets such as the U.S. of China enterprise.The U.S. client who has has turned to surrounding countries to order.Therefore seek the instead of alloy composition of molybdenum, most important.
Both at home and abroad in the books and document about high mangaenese steel, refer to its chemical ingredients nothing more than C, Mn, Si, P, S, and Cr, Ni, Mo, Ti, V, Nb and rare earth element, accidental argumentation to W, also be to say that it impels carbide to distribute on crystal boundary, unfavorable to performance.
Summary of the invention
The objective of the invention is to, a kind of high manganese steel containing tungsten that is used for wear resistance castings is provided, this high manganese steel containing tungsten can satisfy above-mentioned requirements and competitive on price.
Tungsten and molybdenum belong to VI together in the periodic table of elements
AFamily.In structure iron and tool steel, the mutual alternate successful example of two elements is not rarely seen.
Because molybdenum has above-mentioned many good actions in high mangaenese steel, tungsten also can have the possibility of respective action, therefore, the applicant attempts replacing molybdenum (all or part of) with tungsten in casting high mangaenese steel, attempt to obtain a kind of price low and can with contain the high manganese steel containing tungsten that molybdenum casting high mangaenese steel effect is equal to.
To achieve these goals, the technical scheme that the present invention takes is, a kind of high manganese steel containing tungsten that is used for wear resistance castings, it is characterized in that this high mangaenese steel contains the chemical ingredients of following weight ratio: C:0.95-1.35%, Mn:11.5-14%, Si:0.3-1.0%, Cr:0.2-1.0%, P :≤0.07%, surplus is Fe.Wherein the content of W is 0.6-2.0%, or the content of W adds the Mo of 0.2-0.4% when being 0.2-0.5% again, more than is the foundry goods at the wearing and tearing that are hit.
When broken non-metallic material, considerable situation belongs to non-thump abrasive wear.For this reason, the applicant has designed following high manganese steel containing tungsten again, and its chemical ingredients that comprises is: C:0.95-1.35%, and Mn:11.5-14.0%, Si:0.3-1.0%, Cr:0.2-1.0%, W:3.5-4.2%, P :≤0.07%, surplus is Fe.Contrast with the E-2 steel among the U.S. ASTM A 128/128M.
Can also add rare earth element Re at above-mentioned tungsten-containing alloy steel, its content is 0.02-0.15%.
The high manganese steel containing tungsten that is used for wear resistance castings of the present invention, contain molybdenum high mangaenese steel with the U.S. and common high mangaenese steel contrasts, show through simulation part shock bending test, mechanicl test and field service test result, in high mangaenese steel, add W, can obviously improve the intensity and the toughness of steel.W and other alloying element are combined with good comprehensive action.The high mangaenese steel of tungstenic is compared with common high mangaenese steel, and performance is high.At W, in the contrast of two kinds of high mangaenese steel of Mo content suitable (two parts of W are for a Mo), mechanical property and work-ing life are all equally matched, and cost reduces greatly.
Description of drawings
Fig. 1 is the sampling point synoptic diagram, and is wherein circular as tensile test bar to getting from A, gets squarely as impact specimen, and sampling method is the line cutting.
Embodiment
The applicant has launched research and has carried out a large amount of tests according to technique scheme, and its smelting, casting and thermal treatment process and existing processes are roughly the same, and therefrom filters out best chemical ingredients.Casting high mangaenese steel and the common high mangaenese steel that again steel grade and U.S. of this composition is contained Cr, Mo has carried out simultaneous test afterwards.The foundry goods that is hit and weares and teares is made mechanical property simultaneous test and the on-the-spot simultaneous test of using.Be subjected to the foundry goods of abrasive wear, then only make scene simultaneous test in work-ing life.Each steel grade chemical ingredients is referring to table 1, and in the table No. 2, No. 3 No. 4 and No. 11 steel grades are casting high mangaenese steel of the present invention, wherein are used in the foundry goods that is subjected to abrasive wear No. 11.No. 5, No. 12 steel grade is the high mangaenese steel that the U.S. contains Mo, and wherein No. 12 is U.S. E-2 steel, is used for the foundry goods of abrasive wear.No. 8 steel grades are common high mangaenese steel.
Table 1: chemical ingredients, surplus Fe
| Steel grade number | C(％) | Mn(％) | Si(％) | Cr(％) | Mo(％) | W(％) | P(％) | Re(％) | Annotate |
| 2 | 1.05 | 12.35 | 0.52 | 0.42 | 0.31 | 0.29 | 0.052 | 0.05 | Steel grade of the present invention |
| 3 | 0.96 | 11.61 | 0.32 | 0.21 | 1.96 | 0.041 | 0.06 | ||
| 4 | 1.07 | 12.23 | 0.57 | 0.38 | 1.00 | 0.043 | 0.04 | ||
| 11 | 1.33 | 13.78 | 0.96 | 0.95 | 4.11 | 0.061 | |||
| 5 | 1.14 | 12.38 | 0.43 | 0.35 | 0.45 | 0.058 | The U.S. contains molybdenum high mangaenese steel | ||
| 12 | 1.30 | 12.60 | 0.46 | 1.90 | 0.056 | ||||
| 8 | 1.16 | 13.07 | 0.46 | 0.057 | Common high mangaenese steel |
Its preparation method is undertaken by traditional high mangaenese steel production method.
2, test-results:
A, simulation part shock bending test:
The applicant adds up by the present tup of producing, and most of thickness is 120mm.
Simulation casting dimension: 120 * 120 * 500 (mm).The centre is cast with V-notch, the dark 50mm of breach.Above-mentioned three kinds of simulation foundry goods carry out the tough processing of water by thermal treatment process separately.
The iron stone roller of heavy 865kg is adopted in test, hangs highly 5 meters, and freely falling body is pounded to foundry goods.Test-results such as table 2.
Table 2:
| Steel grade number | Strike the disconnected used number of times of foundry goods | Fracture morphology |
| 3 | 7 | Fracture is uneven, and tear trace is obvious. |
| 2,4,5 | 4 | Fracture is uneven, and tear trace is not obvious. |
| 8 | 3 | No tear trace. |
B, mechanicl test:
Sampling: above-mentioned each steel grade is cast the tup of same model respectively.Sampling after heat treatment, sampling plan and spot size are as shown in Figure 1, and be circular as tensile test bar to getting from A, gets the square impact specimen that is.Sampling method is the line cutting.
Test-results such as table 3:
Table 3:
| Steel grade number | Tension test | Shock test AkV (JCm -2) | ||
| σ b(Mpa) | A％ | Normal temperature | -40℃ | |
| 3 | 535 555 530 | 19.0 18.4 19.0 | 262，226 254，234 | 116，110 184，175 |
| 4 | 506 510 450 | 19.0 15.0 - | 210，206 156，160 | 115，105 98，118 |
| 2 | 502 460 430 | 18.0 11.0 - | 210，180 132，127 | 120，115 102，96 |
| 5 | 505 470 435 | 10.0 17.4 - | 124，120 170，206 | 117，78 93，110 |
| 8 | 440 480 495 | 8.8 8.8 - | 115，104 90，78 | 50，58 50，48 |
Annotate: tension test is undertaken by GB 228-2002 standard, and shock test is undertaken by GB 229-1994 standard.
Test-results shows, tungstenic and to contain molybdenum high mangaenese steel more high than common Mn13 high mangaenese steel performance.Except that containing the higher mechanical property of higher a kind of steel (No. 3) tool of W amount, contain the Mo steel No. 5 of other the two kinds of steel (No. 2 with No. 4) and the U.S. to compare, mechanical property is approaching.With the same in some structure iron, tool steel, the effect of two parts of W and a Mo is similar in high mangaenese steel for proof.
C, the on-the-spot use:
The tup that No. 4 No. 3 and No. 2 steel are made send U.S. client on probation, and it is close that the mean lifetime of No. 2 steel and No. 4 steel and the U.S. No. 5 contain Mo high mangaenese steel, and the life-span of No. 3 steel (containing W1.96%) is wanted high 5-10%.
Make the tup that is subjected to abrasive wear by No. 11 and No. 12 steel, send U.S. client on probation, the life-span is on a par.
The production cost contrast:
With on March 14th, 05 domestic market be example: 60% molybdenum-iron valency is 420,000 yuan/T, is equivalent to 700,000 yuan/T of pure molybdenum; 70% ferrotungsten valency is 15.6 ten thousand yuan/T, is equivalent to 22.3 ten thousand yuan/T of pure tungsten valency.We adopt 2 parts of tungsten generation 1 part of molybdenums.2 tons of tungsten valencys are 44.6 ten thousand yuan, than cheap 25.4 ten thousand yuan of 1 ton of molybdenum valency.Save material cost 36% (price of rare earth is 1.4 ten thousand yuan/T, add-on again seldom, the ratio that accounts in cost is very little) improved product at home, the competitive power in outer market.
Claims (4)
1. high manganese steel containing tungsten that is used for wear resistance castings, it is characterized in that, this high mangaenese steel contains the chemical ingredients of following weight ratio: C:0.95-1.35%, Mn:11.5-14%, Si:0.3-1.0%, Cr:0.2-1.0%, W:0.2-0.5%, Mo:0.2-0.4%, P :≤0.07%, surplus is an iron.
2. a high manganese steel containing tungsten that is used for wear resistance castings is characterized in that, this high mangaenese steel contains the chemical ingredients of following weight ratio: C:0.95-1.35%, Mn:11.5-14%, Si:0.3-1.0%, Cr:0.2-1.0%, W:0.6-2.0%, P :≤0.07%, surplus is an iron.
3. the wear resistance castings high manganese steel containing tungsten that is used for as claimed in claim 2 is characterized in that the content of the W in the described high mangaenese steel is 3.5-4.2%.
4. as claim 1 or the 2 or 3 described wear resistance castings high manganese steel containing tungstens that are used for, it is characterized in that this steel grade also contains rare earth element Re, its content is 0.02-0.15%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50128617A (en) * | 1974-03-30 | 1975-10-09 | ||
| CN1068857A (en) * | 1991-10-10 | 1993-02-10 | 株洲市机械工业研究所 | The multicomponent alloy malleablized high-Mn steel |
| US5308408A (en) * | 1990-09-12 | 1994-05-03 | Lokomo Oy | Austenitic wear resistant steel and method for heat treatment thereof |
| JPH1161339A (en) * | 1997-08-08 | 1999-03-05 | Kobe Steel Ltd | High toughness super wear-resistant steel and its manufacture |
| CN1363712A (en) * | 2001-10-22 | 2002-08-14 | 刘承刚 | High-strength alloyed cast steel with high resistance to wear and impact and its preparing process |
-
2005
- 2005-04-25 CN CNB2005100419923A patent/CN100374607C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50128617A (en) * | 1974-03-30 | 1975-10-09 | ||
| US5308408A (en) * | 1990-09-12 | 1994-05-03 | Lokomo Oy | Austenitic wear resistant steel and method for heat treatment thereof |
| CN1068857A (en) * | 1991-10-10 | 1993-02-10 | 株洲市机械工业研究所 | The multicomponent alloy malleablized high-Mn steel |
| JPH1161339A (en) * | 1997-08-08 | 1999-03-05 | Kobe Steel Ltd | High toughness super wear-resistant steel and its manufacture |
| CN1363712A (en) * | 2001-10-22 | 2002-08-14 | 刘承刚 | High-strength alloyed cast steel with high resistance to wear and impact and its preparing process |
Non-Patent Citations (2)
| Title |
|---|
| 含铬高鳃钢铸件的应用研究. 周文辉，黄伟嘉.南方钢铁，第6期. 1996 * |
| 提高高锰钢衬板性能的研究. 蔡岳洪，胡晖.铸造技术，第3期. 2000 * |
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