CN1132261A - Backing material for metel and saw and metal band saw, having superior fatigue strength regarding weld zone - Google Patents
Backing material for metel and saw and metal band saw, having superior fatigue strength regarding weld zone Download PDFInfo
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- CN1132261A CN1132261A CN95118719A CN95118719A CN1132261A CN 1132261 A CN1132261 A CN 1132261A CN 95118719 A CN95118719 A CN 95118719A CN 95118719 A CN95118719 A CN 95118719A CN 1132261 A CN1132261 A CN 1132261A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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Abstract
The present invention relates to a barrel material use in metal band saw and metal band saw.Thereinto, this metal band saw barrel material excellent in the fatigue strength in the weld zone is the one having a composition, by weight, 0.40 to 0.50% C, <=1.0% Si, <=1.5% Mn, 1.0 to 1.5% Cr, one or two kinds of Mo and W by 0.5 to 0.9% by Mo+1/2W, 0.1 to 0.5% V and 0.01 to 0.1% Al, and the balance Fe with impurities, and <=0.2% Nb may be added to the same composition.
Description
The present invention relates to be used for the back lining materials and the band saw for metal of band saw for metal, described back lining materials is welded on the rapid steel cutting edge material.
Band saw for metal is made by the following step: uses electron beam welding, laser beam weldering, Inert gas welding etc. that the Dry Steel backing blank of rapid steel cutting edge blank and low price is bonded to each other and is integral, thus the rapid steel of conserve expensive; Make engaged cutting edge blank form cutting edge, and it is heat-treated under the condition of the rapid steel that is suitable for using as the cutting edge material, just, in about 1200 to 1220 ℃ of quenchings and 540 to 570 ℃ of following tempering.
Requirement has the material of high tenacity and high-fatigue strength as back lining materials, wherein, even also grain coarsening or analogue can not take place when material stands thermal treatment identical as rapid steel.In order to satisfy this requirement, the present inventor once developed with rapid steel thermal treatment the same terms under heat-treat and the material that has suitable performance reliably, and developed the novel alloy steel that is published in following patent document: special public clear 49-16008, special public clear 54-5366, special public clear 55-32778, special public clear 56-11744, special public clear 59-10991, special public clear 61-12022, spy open flat 2-115353 and the flat 4-354852 of Te Kai, and oneself is put to practical application these steel alloy industries.
Band saw for metal is usually by following step manufacturing: the cutting edge blank is soldered on the backing blank; Make cutting edge; The product that welds is heat-treated; With the two ends jam welding of banded backing blank so that form ring-type; And carry out spot anneling with regard to its welding zone.
Band saw for metal is rotated between the two-wheeled that is installed on the cutting machine, and to being fixed in material (mainly the being steel) cutting between the two-wheeled.
Crooked in cutting process in order to prevent to want cutting material, the band saw for metal that is between the two-wheeled is applied tension force, simultaneously, when band saw for metal was driven, it was subjected to stress in bending repeatedly along two-wheeled.
And because wheel tilts from horizontal plane, band saw for metal is subjected to torsional stress corresponding to the obliquity of wheel.Therefore, when band saw for metal is driven, its back lining materials stand severe condition, such as tension stress, stress in bending and torsional stress repeat the influence.Particularly, band saw for metal is subjected to bigger stress on modern sawing machine, so that prevent that material is crooked in cutting process; And make the machine densification and improve sawed-off ability.
As the back lining materials that has the height fatigue strength of above-mentioned various stress, the present inventor has developed disclosed steel in above-mentioned publication, and is put to practicality.As a result, improved the anti-fracture time length of band saw for metal widely.
Since modern age band saw for metal development, cause the improvement of the fatigue strength of back lining materials itself, yet the fracture of band saw for metal has 50% to be to occur in welding zone (sedimentary province and be close to the heat affected zone of sedimentary province specifically.Below these two districts be referred to as the welding zone together), by this district, the two ends of back lining materials are soldered and form ring-type.
Usually,, the two ends of backing body are docked mutually, by applying big electric current and the fusing of backing body two ends being welded them together to it for band saw for metal is welded into ring-type.After such upset buttwelding, annealed between the low temperature short-term in the welding zone.For the fatigue strength that keeps the welding zone at good order and condition, the integrity of welding zone is important.
Band saw for metal is being welded into ring-type, and as mentioned above, with the fusing of the opposite end of same backing body and be welded to each other, the performance in upset buttwelding district is subjected to the influence of back lining materials composition very big.
The contriver has studied the back lining materials composition that its fatigue strength is worsened, this composition can prevent to produce sand holes when welding cutting edge blank and backing blank, and this composition can improve the integrity in upset buttwelding district when being welded into ring-type at backing blank two ends, just: after the short period of time low-temperature annealing, this composition can reduce the difference between backing body hardness and the welding zone hardness after welding.
In following explanation, so-called " welding zone " except other has special lexical or textual analysis, is meant the part that the two ends of backing blank interconnect.
Below the welding zone is explained in detail.Welding zone after the welding comprises, the melting area, extends near the melting area and is subjected to the floor of chilling again that melting heat influences most and in abutting connection with the high tempering district of chilling floor again.The melting area, chilling floor and high tempering district have Hardness Distribution again, and wherein the hardness in every layer or every district is different.As local short period of time annealed result after welding, the softening and hardness reduction of these layers.At this moment, the Hardness Control that preferably makes the backing body with each layer hardness par of welding zone on, and make on the micro-part of each layer changes in hardness reduce to minimum.
From this viewpoint, once studied again and be used for the back lining materials commonly used that band saw for metal is developed, the inventor finds that the exploitation of carrying out usually mainly is in order to strengthen back lining materials and to improve fatigue strength, and a kind of trend of using high quality steel to make back lining materials is arranged.The result, the contriver finds, even control the hardness of each layer of welding zone so that it has the level identical with back lining materials by the control welding conditions with local annealing conditions, but in the micro-part of each layer of welding zone, changes in hardness takes place still, therefore cause the welding zone early fracture.
The object of the present invention is to provide a kind of back lining materials and band saw for metal that is used for band saw for metal, in this band saw for metal, the backing body has high-fatigue strength and its welding zone and has hardness with backing body average hardness par, and reduce to minimum in the hardness deviation of welding zone, simultaneously, this welding zone has good fatigue strength.
The present invention has the back lining materials that is used for band saw for metal of superior fatigue strength with regard to its welding zone, must have Vickers' hardness 450HV or higher at least, and when backing with rapid steel cutting edge the same terms under during thermal treatment, have high fatigue strength.Therefore, back lining materials must have such Chemical Composition so that even also can suppress grain coarsening during at quench hot when back lining materials, and after about 540 to 570 ℃ of following tempering, also can obtain about 450 hardness that arrive 570HV as the rapid steel tempering temperature.Moreover according to the present invention, the upset buttwelding at backing blank two ends is finished after above-mentioned thermal treatment, and spot anneling is subsequently finished between short-term at low temperatures with regard to the welding zone, and wherein, the integrity of welding zone is necessary; And in order to be reduced in the nonhomogeneous hardness between backing body and the welding zone, the hardness performance that only satisfies above-mentioned heat-treat condition and backing body is not enough, need do the more restriction that replenishes to this composition.
Have on it is made, being severely limited of above-mentioned this restriction at the back lining materials that is used for band saw for metal of the present invention, minimum V is a main adding elements, so that form MC type carbide, thereby even also can prevent grain coarsening from quench hot with the Nb that adds where necessary.In addition, C, Cr and Mo and/or W must be added so that form carbide and improve anti-temper softening, therefore, back lining materials has when it is used for band saw for metal and is 450～550HV hardness of suitable hardness and has suitable wear resistance after about 540 to the 570 ℃ of following tempering of the tempering temperature of rapid steel cutting edge material.
In addition, each needs above-mentioned Elements C, Cr and Mo and/or W to add with minimum, to improve anti-temper softening.Therefore, when two opposite ends of backing blank are welded to one another, be not less than the backing body, even also be like this when the backing blank partly is melted hot high tempering in the hardness of the backing blank of adjacency melting area part.On the other hand, in must being limited to C, Cr and Mo and/or each element of W among a small circle, so that make back lining materials have so suitable anti-temper softening so that the melting area and again the chilling layer can soften to and implement the same hardness situation of local short-term annealed back lining materials by welding back welding zone.Particularly, under the situation that these constituent contents improve, the melting area and again the hardness of chilling layer become the hardness that is higher than the backing body.In order to compensate this too high firmness level, if be high temperature with the spot anneling condition changing or prolong annealing time, then will cause another problem, promptly neighbouring part is significantly less than the backing body in the hardness of the back lining materials part of the welding zone of high tempering.Therefore, the upper limit of constituent content must strict restriction.The inventor finds that for satisfying all above-mentioned characteristics, the content restriction of these elements is as follows: 0.40 to 0.50% C, 1.0 to 1.5%Cr and 0.5 to 0.9% be selected from least a among Mo and the W, its amount press Mo+0.5 * W calculating.
Many common used materials in actual use (as the backing body) will add Ni to obtain toughness, this causes occurring retained austenite after welding, this austenite changes into unsettled martensitic structure by short period of time heating subsequently, and result, the hardness of welding zone more are higher than backing body hardness partly.Back lining materials of the present invention is characterised in that and does not contain Ni.
By above-mentioned restriction on composition range, the present invention succeeds in producing band saw for metal first, wherein, after two ends butt welding of backing blank and spot anneling, be in ± 30HV scope or littler in the difference between the average hardness of the hardness of welding zone and backing body.
More specifically, according to first aspect present invention, a kind of back lining materials that is used to the band saw for metal of the cutting edge that has the backing body and be welded to the backing body by the welding zone is provided, described back lining materials has superior fatigue strength with regard to its welding zone, it is characterized in that, described back lining materials mainly contains 0.40 to 0.50% C by weight, be not more than 1.0% Si, be not more than 1.5% Mn, 1.0 to 1.5% Cr, at least a element that is selected from Mo and W, its content is calculated as 0.5 to 0.9% by Mo+0.5 * W, 0.1 to 0.5%V, 0.01 to 0.1% Al, and surplus Fe and incidental impurities.According to second aspect present invention, a kind of back lining materials that is used to the band saw for metal of the cutting edge that has the backing body and be welded to the backing body by the welding zone is provided, described back lining materials has superior fatigue strength with regard to its welding zone, it is characterized in that, described back lining materials mainly contains 0.40 to 0.50% C by weight, be not more than 1.0% Si, be not more than 1.5% Mn, 1.0 to 1.5% Cr, at least a element that is selected from Mo and W, its content is calculated as 0.5 to 0.9% by Mo+0.5 * W, 0.1 to 0.5% V, 0.01 to 0.1% Al, be not more than 0.2% Nb, and surplus Fe and incidental impurities.
According to third aspect present invention, a kind of band saw for metal is provided, this band saw for metal by the welding zone with the mutual butt welding in back lining materials two ends and subsequently spot anneling make, described band saw for metal has superior fatigue strength with regard to its welding zone, it is characterized in that the difference between welding zone hardness and backing body average hardness is ± 30HV or littler.According to fourth aspect present invention, a kind of band saw for metal is provided, this band saw for metal is formed by the back lining materials that has according to the present invention's first and second aspect components, its two ends are by the mutual butt welding in welding zone, spot anneling subsequently, described band saw for metal has superior fatigue strength with regard to its welding zone, it is characterized in that, the difference between the average hardness of the hardness of welding zone and backing body is ± 30HV or littler.
Below make an explanation with regard to reason and some restrictions of chemical ingredients restriction.
C is a kind of for obtaining backing body and welding zone intensity and toughness and for the annealed structure of welding zone is changed into the important element of stablizing martensitic phase.C also with element such as Cr, the Mo, W, V and the Nb chemical combination that form carbide, make these elements during about 540 to 570 ℃ of tempering with fine carbide form precipitation, therefore, improve anti-temper softening.In addition, for not reducing obtaining 450HV or higher hardness behind the tempering back lining materials and compare for the welding zone hardness after making annealing and back of the body material body hardness, it is necessary then being not less than 0.40% C.
On the other hand, when the adding of C greater than 0.50% the time, cause hardness after about 540 to 570 ℃ of tempering greater than 550HV.As a result, not only the fatigue strength of backing body worsens, and the residual Ovshinsky scale of construction in the welding zone also increases, and therefore, can not obtain the hardness of as-annealed condition, so the upper limit amount of C places 0.50%.
When the refinement back lining materials, Si is as reductor, and Si is effective improving anti-temper softening.When Si adds when excessive, particularly under the situation of upset buttwelding, after low-temperature annealing in short-term, the hardness of welding zone becomes too high.Therefore, the upper limit of Si content places 1.0%, and is best, and Si content is not more than 0.6%.
Mn is similar to Si, is used as reductor when the refinement back lining materials.Yet the excessive Mn of adding worsens the cold-workability of back lining materials, and therefore, the upper limit of Mn content places 1.5%, and preferably Mn content is not more than 1.0%.
Cr improve back lining materials hardenability, improve that the remollescent drag takes place in institute when about 540 to 570 ℃ of tempering so that obtain above-mentioned 450HV or higher hardness, and prevent the reduction of welding zone hardness.Therefore, the Cr subsistence level 1.0%.Yet when adding Cr, the layer of chilling again in the heat affected zone produces the part with high rigidity, even also like this after annealing, therefore, makes the heat affected zone have uneven Hardness Distribution when excessive.So the upper limit of Cr content places 1.5%.
The two improves the anti-temper softening of back lining materials Mo and W, and is being effectively obtaining aspect the high rigidity, even also is like this with rapid steel when the back lining materials while during through heat-treated.And Mo and W are the important elements that is used to prevent that the hardness of welding zone under the upset buttwelding situation from reducing, and therefore, must add at least one element among Mo and the W.Mo improves the flexible effective element, and W is the effective element that improves wear resistance.Mo and W optionally add, and its add-on is pressed Mo+0.5 * W and calculated in 0.5 to 0.9% scope.In order to obtain above-mentioned effect, must add and be not less than 0.5%Mo+0.5 * W.Yet when excessive adding Mo and W, the carbide of Mo and W is easy to assemble when secondary hardening, therefore, toughness is worsened, and make the hardness of welding zone too high.So their upper limit is calculated by Mo+0.5 * W and is limited to 0.9%.
V produces the specific carbide of MC-type, and does not have a kind of carbide to be dissolved in the matrix, even also is so when the quenching temperature of rapid steel, therefore prevents the grain coarsening when quenching.This carbide also has unusual effect at the raising anti-temper softening, and V prevents the intensity of back lining materials and the important element that welding zone hardness reduces.One of feature of the present invention is exactly to add fashionable as principal element as V, element such as Cr, the Mo, W and the Nb that are used to improve anti-temper softening will control to minimum, so as to obtain to be used for band saw for metal back lining materials suitable hardness and make and reducing to minimum by the difference of hardness (being changes in hardness) of the formed welding zone of upset buttwelding.
In order to obtain above-mentioned effect, need to add 0.1% V at least.Yet, add fashionablely when V is excessive, the former carbide of the MC-type of crystallization just is easy to assemble when solidified, thereby the toughness of backing body is worsened and the hardness of welding zone becomes too high, and therefore, the upper limit that V measures places 0.5%.
Al is a kind of strong reductor and is the element of a kind of change caused non-metallic inclusion form when carrying out ingot casting because of back lining materials.More specifically, the inclusion by adding Al, make the Mn that causes and/or Si oxide compound in molten metal when ingot casting is because Al
2O
3Generation and be lowered, therefore, when cutting edge blank and backing blank are welded to one another, can prevent the generation of sand holes.Moreover Al generates fine AlN with N chemical combination in molten metal, therefore, be the effective element that is used to suppress grain coarsening.For obtaining above-mentioned effect, need add 0.01%Al at least.Yet excessive adding Al can cause the Al that produced
2O
3Alligatoring, thereby, toughness is worsened.Therefore, the upper limit of Al content places 0.1%.
Nb adds where necessary, because Nb forms dystectic MC-type carbide and can prevent the grain coarsening of back lining materials when back lining materials and rapid steel cutting edge material harden simultaneously.Yet when excessive adding Nb, MC-type carbide is easy to assemble, and therefore, the upper limit of Nb content places 0.2%.
Ni improves by hardenability and the flexible effective element of common plastic working such as forging and rolling institute work material.Yet in back lining materials of the present invention, its two ends are welded to each other, and are easy to produce the fine segregation with high Ni concentration in the melting area, and are exactly that this isolation portion becomes residual austenite.
When carrying out short-cycle annealing subsequently, residual austenite partly changes martensite into and becomes unstable structure, wherein, has increased the variation of the microhardness of melting area.Therefore, in back lining materials of the present invention, do not add Ni.
In the following embodiments, carried out the notch fatigue test of band saw for metal of the present invention welding zone and measured the microhardness distribution of welding zone.As can be known from the results, the difference between welding zone hardness of measuring after spot anneling and the backing body average hardness is during greater than ± 30HV, and the fatigue strength of welding zone reduces.Therefore, difference of hardness must be ± 30HV or littler.
And band saw for metal of the present invention is preferably with the back lining materials manufacturing that has according to the present invention first or second aspect composition.
The summary of accompanying drawing:
Fig. 1 is an expression plate material (thickness of slab: fatiguespecimen shape figure 1mm);
Fig. 2 is an expression plate material (thickness of slab: the welding zone shape figure of fatiguespecimen 1mm);
Fig. 3 A represents the hardness measurement position of welding zone;
Fig. 3 B is illustrated in the hardness profile of welding zone;
Fig. 4 A and 4B represent the partial graph of band saw for metal.
On following embodiment basis, the present invention is described as follows:
Embodiment 1
In order to estimate the back lining materials that is used for band saw for metal of the present invention (1) (below be referred to as the invention steel), prepared invention steel, the ordinary steel that is shown in table 1 and relatively used steel with melting method.Use steel as a comparison, prepare and tested the material that contains the different amounts of Ni, Cr, Mo and C, thus with regard to susceptible of proof according to the importance of the present invention about its composition and content restriction.
Table 1
Number chemical ingredients (weight %)
C Si Mn Ni Cr W
1 0.45 0.30 0.70 - 1.40 -
2 0.41 0.21 0.53 - 1.45 -
3 0.48 0.37 0.55-1.21 0.41 invention steel 4 0.44 0.22 0.54-1.45 1.56
5 0.45 0.27 0.51 - 1.10 -
6 0.46 0.41 0.62 - 1.47 1.31
7 0.44 0.31 0.57 - 1.33 0.56
11 0.43 0.21 0.74 0.75 1.98-ordinary steel 12 0.44 0.30 0.35-2.00-
13 0.27 0.50 1.20 - 6.00 1.50
14 0.30 0.25 0.40 0.60 4.00 -
21 0.45 0.32 0.71 0.80 1.42-comparison 22 0.42 0.30 0.75-1.72-usefulness steel 23 0.55 0.33 0.75-1.50--
24 0.45 0.32 0.71 - 1.43 -
Table 1 (continuing)
Number chemical ingredients (weight %)
Mo V Nb Al Fe
1 0.70 0.30-0.05 surplus
2 0.81 0.26-0.08 surplus
3 0.43 0.48 0.07 0.05 surplus invention steel, 4-0.27-0.07 surplus
5 0.57 0.28 0.05 0.02 surpluses
6-0.33 0.09 0.03 surpluses
7 0.44 0.21-0.05 surplus
11 1.15 0.13-0.03 surplus ordinary steel, 12 0.60 0.65 0.10 0.07 surpluses
13 1.50 0.07-0.07 surplus
14 2.00 0.15-0.01 surplus
21 0.71 0.29-0.06 surplus is 22 0.69 0.28-0.04 surplus steel 23 0.70 0.29-0.03 surplus relatively
24 1.10 0.31-0.04 surplus is annotated: ordinary steel is for No. 11 the material that is published in special public clear 61-012022
Ordinary steel is for No. 12 the material that is published in special public clear 54-005366
Ordinary steel is for No. 13 the material that is published in special public clear 55-032778
Ordinary steel is for No. 14 to be published in the material that the spy opens flat 4-354852
Invention steel, ordinary steel and relatively with steel with the 20kg amount smelt, system ingot and just roll into base.Subsequently steel is become the band with thick 1.0mm and wide 30mm through hot rolling, annealing, cold rolling and annealing and finish to gauge.Then, this band 1200 ℃ of quenchings with 560 ℃ of tempering, with regard to the Hardness Distribution in its hardness of each material tests, fatigue property, upset buttwelding district, the fatigue property in upset buttwelding district, be the results are shown in table 2 then.Before test, remove because the burr (convex part) due to the upset buttwelding, with switch on 20 second mode with material at 700 ℃ of relevant welding zones of local heating, and the surface of abrasive material.
The sample that use is shown in Fig. 1 shape carries out the fatigue test of backing body.With carrying out the fatigue test of welding zone with the identical shaped sample of backing body sample, as shown in Figure 2, the bottom with otch in each sample is positioned at the welding zone.In addition, carry out hardness measurement (as shown in Figure 3) along the edge surface of each flat specimen in the vertical by the mode of crossing welding zone measurement hardness.
Table 2
Number changes in hardness of thermal treatment in the welding zone
(1200 ℃ of quenchings, at (HV)
560 ℃ of tempering) hardness
(HV) +△ -△
1 541 20 12
2 532 17 15
3 547 25 9 invention steel 4 537 15 20
5 521 5 30
6 545 21 11
7 549 20 17
11 547 41 13 ordinary steels 12 545 43 15
13 520 70 57
14 540 62 10
21 537 47 12 compare 22 551 35 21 usefulness steel 23 574 44 20
24 550 18 15
Table 2 (continuing)
Number repeat to execute and be processed into metal until numerical value to fracture as load
Idle running behind the band saw
The rupture time of the welding zone of cylindrical material
Fatigue strength fatigue strength (h)
1 1.36×10
4 1.30×10
4 62.7
2 1.32×10
4 1.29×10
4 66.9
3 1.39 * 10
41.35 * 10
4Do not try invention steel 4 1.42 * 10
41.33 * 10
4Not examination
5 1.30 * 10
41.26 * 10
4Not examination
6 1.40 * 10
41.32 * 10
4Not examination
7 1.47 * 10
41.35 * 10
4Not examination
11 1.39 * 10
41.18 * 10
451.3 ordinary steel 12 1.51 * 10
41.15 * 10
454.9
13 1.27 * 10
41.11 * 10
4Not examination
14 1.35 * 10
41.22 * 10
4Not examination
21 1.35 * 10
41.10 * 10
4Examination does not compare 22 1.47 * 10
41.01 * 10
4Steel 23 1.50 * 10 not on probation
40.98 * 10
4Not examination
24 1.50 * 10
41.25 * 10
4Not examination
In fatigue test, make sample at tensile stress 244 N/mm
2With another tensile stress 882N/mm
2Between repeat to load, and calculate each sample like the repetition numerical value of sinusoidal load up to fracture.Test under the same conditions repeats five times, so that derive its mean value from five tests, thereby estimates fatigue property.
In addition, measure the Hardness Distribution of each sample thickness centre portions by the micro-vickers hardness survey meter under 1kg load, by backing body, heat affected zone, melting area, heat affected zone and backing body order, thereby measure the Hardness Distribution in upset buttwelding district, as shown in Figure 3A.In Fig. 3 B, with respect to the hardness of backing body, hardness increases to be represented with symbol+△; Hardness reduces then to be represented with symbol-△.
As known from Table 2, the changes in hardness that the welding zone of invention steel has is little, and the difference of its fatigue strength and back lining materials is little, therefore, is difficult to rupture in the welding zone.
Ordinary steel contains 0.75%Ni for No. 11 and than the more Cr of invention steel, when with the hardness ratio of backing body than the time, the welding zone hardness that No. 11, ordinary steel is partial to the higher hardness aspect widely.Therefore, be appreciated that and do not add Ni and add Cr and be not more than 1.5% good result that can cause shown in the invention steel.Relatively use 21 to No. 24 contained elements of steel outside invention composition of steel scope.So relatively using in the steel, the hardness deviation of welding zone is big, therefore, fatigue strength is worsened.
In order to confirm above-mentioned test-results, each true band saw 1 with backing body 2 and cutting edge 3 is made for No. 11 and No. 12 with No. 1, invention steel and No. 3 and ordinary steel.Band saw is contained on the sawing machine, makes to be under the tension force that increases with predetermined amount, and make idle running, so that measure time cycle up to fracture.The results are shown in table 2.Three samples are for No. 1 62.7 hours up to the mean time of fracture with regard to the invention steel, and the invention steel is for No. 3 66.9 hours, and the fracture of every kind of situation all is to occur on the backing body.On the other hand, three samples are for No. 11 51.3 hours (two sample fracture wherein being arranged in the welding zone) and ordinary steel is for No. 12 54.9 hours (sample fracture wherein being arranged in the welding zone) up to the mean value of fracture with regard to ordinary steel.
Can recognize that from above test-results the invention steel is superior as the back lining materials of band saw for metal.
As mentioned above, grain coarsening does not take place in back lining materials of the present invention, even when making the back of the body It also is like this that lining material stands the heat treatment identical with high-speed steel cutting edge material. Again owing to can get To predetermined hardness, the backing body also has high-fatigue strength. And the hardness of docking welding zone becomes Change little and the upset butt welding district has the hardness identical with the backing body basically. As a result, as Have the band saw for metal more superior than the fatigue strength of common steel, back lining materials of the present invention is to have Effect.
Claims (4)
1, the back lining materials that is used to have backing and is soldered to the band saw for metal of the cutting edge on the backing by the welding zone, described back lining materials has superior fatigue strength with regard to its welding zone, it is characterized in that, described back lining materials mainly contains by weight 0.40 to 0.50% C, be not more than 1.0% Si, be not more than 1.5% Mn, 1.0 to 1.5% Cr, be selected from a kind of element among Mo and the W at least, its content is calculated as 0.5 to 0.9%, 0.1 to 0.5% V, 0.01 to 0.1% Al according to Mo+0.5 * W, and its surplus is Fe and incidental impurities.
2, the back lining materials that is used to have backing and is soldered to the band saw for metal of the cutting edge on the backing by the welding zone, described back lining materials has superior fatigue strength with regard to its welding zone, it is characterized in that, described back lining materials mainly contains 0.40 to 0.50% C by weight, be not more than 1.0% Si, be not more than 1.5% Mn, 1.0 to 1.5% Cr, at least be selected from a kind of element among Mo and the W, its content is calculated as 0.5 to 0.9% according to Mo+0.5 * W, 0.1 to 0.5% V, 0.01 to 0.1% Al, be not more than 0.2% Nb, its surplus is Fe and incidental impurities.
3, band saw for metal, make by the mutual jam welding in the two ends of backing blank and relevant this welding zone being carried out spot anneling through the welding zone, described band saw for metal has superior fatigue strength with regard to the welding zone, it is characterized in that, be in ± 30HV or littler scope in the hardness of welding zone and the difference between the backing body average hardness.
4, band saw for metal, make by having according to the back of the body material blank jam welding of claim 1 or 2 compositions, the two ends of its backing blank are by the mutual jam welding in welding zone and carry out spot anneling, this band saw for metal has superior fatigue strength with regard to its welding zone, it is characterized in that, be in ± 30HV or littler scope in the hardness of welding zone and the difference between the backing body average hardness.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7065522A JPH08260093A (en) | 1995-03-24 | 1995-03-24 | Metal band saw barrel material excellent in fatigue strength in weld zone and metal band saw |
| JP65522/95 | 1995-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1132261A true CN1132261A (en) | 1996-10-02 |
| CN1043478C CN1043478C (en) | 1999-05-26 |
Family
ID=13289446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95118719A Expired - Fee Related CN1043478C (en) | 1995-03-24 | 1995-10-19 | Backing material for metel and saw and metal band saw, having superior fatigue strength regarding weld zone |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH08260093A (en) |
| KR (1) | KR0175178B1 (en) |
| CN (1) | CN1043478C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358321B (en) * | 2008-09-08 | 2012-02-22 | 杭州钢铁集团公司 | HG20 back material steel for high strength and toughness bimetallic strip saw blade |
| CN112041469A (en) * | 2018-04-11 | 2020-12-04 | Qsgs技术格拉季娜克莱普塞夫斯卡公司 | Steel for single-piece band saw and double-metal band saw for wood |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PT1332822E (en) * | 2002-01-16 | 2007-11-16 | Swarovski Tyrolit Schleif | Bandsaw |
| EP1887096A1 (en) * | 2006-08-09 | 2008-02-13 | Rovalma, S.A. | Hot working steel |
| JP5562758B2 (en) * | 2010-08-11 | 2014-07-30 | 日立マクセル株式会社 | Cutlery manufacturing method, cutlery obtained by this manufacturing method, and small electric device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61130456A (en) * | 1984-11-29 | 1986-06-18 | Honda Motor Co Ltd | High-strength bolt and its production |
-
1995
- 1995-03-24 JP JP7065522A patent/JPH08260093A/en active Pending
- 1995-10-19 CN CN95118719A patent/CN1043478C/en not_active Expired - Fee Related
- 1995-10-19 KR KR1019950036095A patent/KR0175178B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358321B (en) * | 2008-09-08 | 2012-02-22 | 杭州钢铁集团公司 | HG20 back material steel for high strength and toughness bimetallic strip saw blade |
| CN112041469A (en) * | 2018-04-11 | 2020-12-04 | Qsgs技术格拉季娜克莱普塞夫斯卡公司 | Steel for single-piece band saw and double-metal band saw for wood |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043478C (en) | 1999-05-26 |
| JPH08260093A (en) | 1996-10-08 |
| KR960033623A (en) | 1996-10-22 |
| KR0175178B1 (en) | 1999-02-18 |
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