TW490494B - Hot working die steel and member comprising the same for high-temperature use - Google Patents

Abstract

The present invention is to provide a member for high-temperature use comprising the hot working die steel. Hot working die steel comprising: 0.10 to 0.50% by weight of C, 0.5% by weight or less of Si, 1.5% by weight or less of Mn, 1.5% by weight or less of Ni, 3.0 to 13.0% by weight of Cr, 0 to 3.0% by weight of Mo, 1.0 to 8.0% by weight of W, 0.01 to 1.0% by weight of V, 0.01 to 1.0% by weight of Nb, 1.0 to 10.0% by weight of Co, 0.003 to 0.04% by weight of B, and 0.005 to 0.05% by weight of N, the balance including Fe and unavoidable impurities. Hot working die steel according to another aspect further comprising: one or more of 0.001 to 0.05% by weight of a rare earth metal, 0.001 to 0.05% by weight of Mg, and 0.001 to 0.05% by weight of Ca.

Description

Description of the invention [Detailed description of the invention 5] The technical field to which the invention belongs i: ί About a hot room tool steel and a state composed of the hot room tool steel =; that is, the present invention is about-a kind of comparison For high-temperature casting, hot-room tool steel and the structure composed of the hot-room tool steel are provided.4, tools, structural members for casting machines, molds for injection molding machines, high-temperature: hot-forging dies, and High-temperature structure for extrusion molds [prior art]

People are refined by casting "in order to make light metals such as | g, Shao as the main component of the two, and alloys with the town as the main component, as well as the former ^, alloys as the main component (hereinafter It is only called light metal. Eight, such as lead, alloys with lead as the main component, tin and low-melting metals with tin as the main main I, = alloy, etc., and alloys with the aforementioned low-melting metals as P 7 knives (Hereinafter, it is only referred to as a low-melting-point metal.) Metals such as 5 ° / ° Cr (chromium) -based JIS (Japan Standards Association) -1 steel are known as casting molds exposed to high temperature or / w machine structural members. Recently, the above-mentioned production of the light metal and the melting point metal f as tjL has also been carried out using the so-called injection molding (machine method, in this case, the same is used) 丨s (Japan Standards Association: SKD61 steel is used as a mold for injection molding machines or structural members for injection molding machines. In addition, even for hot-forging molds for steel materials, etc., JIS (Japanese Standards Association)-SKD6i steel is generally used In like before JIS (Japan Standards Association) is used for

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In the state of S ^ KD ^ l steel, due to various factors, the so-called π and π winter points are reached. As for the aforementioned factors, they can be roughly listed and divided into the following three points. The first factor is the softening of jis-SKD61 steel caused by prolonged use under high temperature conditions. The JIS-KD61 steel is tempered so that in the JIS-SKD61 steel of Masada Masaru, the JIS-SKD61: of reinforced mesh # is dispersed for the reasonably fine carbides, but 1, When it is used for a long time under a high temperature state, there are phenomena such as so-called dislocation, recovery, and agglomeration and coarsening of carbides. Therefore, The aforementioned JIS-SKD61 steel cannot maintain the original material properties and will gradually soften. The second factor is the so-called thermal cracking.

Of it. The so-called heat crack (heat-check) refers to the tortoise-like cracks on the surface of the production material, and the hot crack (^ 卜 ^^ in / rapid heating and cooling cycle of the repeated effects. The * element is melting Due to the molten metal or alloy :: has a very high reactivity, for this reason, in the state of the molten ^ alloy in contact with the surface of the material, due to the surface of the material

Will be one by one: the ground reacts, and the surface of the material undergoes deterioration and consumption. [Problems to be Solved by the Invention] As before, the jis-SKD61 steel, which has been used in the prior art, is known for its softening resistance, heat-check resistance, and melting resistance at high temperatures. The characteristics such as damage properties are relatively poor, which leads to the phenomenon that the service life of J IS-SKD61 steel reaches the end point. The hair

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V. Description of the invention (3) The Ming system was completed in view of the fact that the above-mentioned system is to provide a sense of ancient f; the purpose of the present invention is heat-cheJk. Good softening resistance at high temperatures, The heat-resistant tool steel composed of heat-resistant and hot-tool steel, and the component with the [solution to the problem]. In order to achieve the image as described above with SKD61 steel as the base material, the present inventor is a user of many M ^ θ β t 1 type materials, and the relevant alloy element pairs

) ': =: =: r :: r, heat-resistant cracking (he— investigation. As a result, it was found that :; == ,,, implementation of "when detailed heat-check (heat-check) and melting resistance: = temperature In terms of the various properties of softening resistance and resistance, by adding alloying elements in various amounts, the above-mentioned various characteristics can be greatly reduced to become appropriate, and the gold composition is formed in order to complete the present invention A new combination that exceeds SKD61 steel. That is, the first feature in the present invention is that it contains the following weight% < hot tool steel, which has a special c (carbon) of 0 · 10 ~ 0 · 50%; and s. ° components ... and Mn (macro) 1.5% or less; and n · (silicon) 0 · 5% or less; and Cr (chromium) 3.0 to 13 · 0%; and 1 (nickel) h 5% or less; and, W (tungsten) 1.0 to 8.0%; and v0 (1 mesh) 0 to 3.0%;%; and Nb (Niobium) 0. 0 1 to 1 · 0%; ^, (hungry) 0. 0 1 to 1 · 0 10. 0%; and, B (Shi Peng) 0. 03 to 0. 2 and Co (#) h 0 ~ 〇 · 0 0 5 ~ 0 · 0 5%; and, also by the remaining portion of eight percent, and 'N (nitrogen ) Is composed of avoidable impurities. 77 (Fe) and not

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490494 V. Description of the invention (4) &quot; &quot; __ The second invention of the hot room tool steel, which is special to the first invention of the hot room tool steel, also contains a 0.001 Readings of ~ 0.05%, 0.0001 ~ 005% = weight% and 0 (with a bow of Π ~ 0. 05%) as ingredients. <錤), to a third invention of the hot tool steel of the present invention, characterized in the first or second invention of the hot tool steel, c ",, · is in) content, a total of 5. &quot; Above. 3Year-and "Crane Tool Steel of the 4th Invention of the Invention, Specially_The 1st, 2 or 3 invention of the Hot Room Tool Steel contains ,,,. 05% 之间。 The ratio of the content B / N is based on 02m- and n, and the content of B (boron) and N (nitrogen) is contained within N, and N is 0.05% or less. Is there a 5 meter content, B + version? The fifth invention of the hot room tool steel in the month: one for all people; in the hot room tool steel of the Ming, except for F "iron" which belongs to the king of the king &amp; Jin Wusu's adder e (iron) The sixth invention of the invention is 05.0% or more. It is 15.0% or more. High-temperature structures such as molds, injection molds for injection molding machines, manufacturing molds, structural molds for casting machines, and extrusion molds: hot forging molds, and 3, 4 or 5 inventions, the special desire is: it is composed of the first, second, [action], ..., θ, steel. The following, in the present invention (^) 5 Asada loose iron Metamorphic element; C ^, which is indispensable to promote the flame properties when combined with the matrix, is the element used to ensure the quenching of the material. At the same time, in the alloy, the C (carbon) system:

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Page 8 490494 V. Description of the invention (5) Co-author F e (iron)

Cr (chromium), Mo molybdenum, and Nb (niobium) and other alloy elements, and the shape m), v (the description of C (carbon) are used to improve the high temperature strength A, so, previously, C (carbon ) Is an element that is used for # π # not bite or lack. Ν Diy and Feng are used to ensure the thermal performance: so: the minimum strength of the required strength, hardness and abrasion resistance. In order to play out For the effect as described above, the above-mentioned C (: the low addition amount must be more than 〇 丨 0%. However, when 3, ♦ off) the most C (carbon), it will be quite easy- II ': The phenomenon of excessive coarsening when added to the material leads to the excessive generation of the anatomy substance of the material. Therefore, it will reduce the heat-check property of the material at a high temperature of 5 2 2 and cause defects. The influence of _ ^ ,,, and clothing (carbon) is limited to 0.10 ~ 0.50% = [C and, for the same reason as above, the c Γ 0 °, and Within the range. The amount of [anti] added is limited to the lower limit of 0.15% and the upper limit of 0.40%. When the alloy is used for melting and refining of alloys, it is used as a deoxidizing element. As a result, the aforementioned si (silicon) can be contained in the form of impurities. It is inevitable that y is unavoidable, and 7 '丨 — 疋, Si (silicon) will smash the basic J phenomenon, and form the so-called Laves phase (Laves phase) 2 gen 2 compounds, so that the alloy Attendance can be considerably reduced. Therefore, it is best to reduce the content of Si (Ux) as much as possible, that is, the content of &amp; (石 夕) is limited to a range of 05% or less. In addition, for the same reason as described above, the addition amount of _ (silicon) is preferably limited to the upper limit of 0. 30%. Μη (猛) is the same as Si (to the same as the element for deoxidation,

490494

It is a useful element ', and Mn (manganese) is an element that can contribute to the so-called hardenability. However, when too much Mn is added, it will cause the deterioration of toughness or the phenomenon of so-called high temperature strength reduction. Therefore, it will affect the softness and heat resistance of the material at high temperature. Defective (heat-check), causing bad shadow. Therefore, the amount of Mn (manganese) added is limited to within a range of 50% or less ^. In addition, for the same reason as described above, the amount of the Mn (manganese) added is preferably limited to the upper limit of 1.0%.

Ν 1 (nickel) is a fairly effective additive element for improving toughness, improving so-called hardenability, or suppressing 5 ferrite grains. However, due to the addition of Ni (record), the so-called high temperature structure is stable but mi, so it will make the material prone to change over time: the second material's high temperature resistance and softening resistance Split-peat-check), causing adverse effects. Therefore, the addition of ytterbium for n welding 1 is limited to the range of 1.50% or less ^ = for the same reason that the destruction of Ni (zinc) is ^ 3 and due to the description of U%. Nickel) is best placed on the upper limit

Cr (chrome) is used to ensure the so-called resistance &gt;

By combining C (carbon), the following: and the indispensable elements of hot tool steel must be different from alloy strength. The stability of molten metal is quite high. Therefore, due to Cr (chromium) Damage to the other party. In order to develop the alloy as described above, the addition amount must be at least 3.0% α. But / therefore, the addition of Cr (chromium) will promote the formation of ~ grain iron—’I, fruit

490494 V Description of the invention (7): Low and high temperature strength decrease occurs. Therefore,: Same as :::,: ~~ 13 · ". And, because of the first two". The addition amount of the upper two '〇TV2) is preferably limited to the range of the lower limit 5. The upper limit 11.0Z. = 〇 (Molybdenum) can be dissolved in the matrix to increase the strength, meanwhile, it promotes the fine analysis of carbides, and presents: The so-called can prevent the aforementioned agglomeration of carbides from occurring:: 弋The stability of (molybdenum) to molten metal is quite high: in order to reduce the damage of the alloy, due to A, according to need,

Here Mo (molybdenum). However, an excessive amount of ΜＯΓ 4 meshes on the 1st and 4th days will have an appropriate δ 肥 轱 讲 々 斗 # The addition of Μο (molybdenum) in the evening will promote ρ preparation: the birth of grain iron &amp;, as a result, The so-called addition amount of Γ, which is lower in the Wei blade and high temperature and high yield, is limited to 3 ,. (Indium) t is, and, for the same reasons as above, the Calgary of the aforementioned Mo w,) is preferably limited to the upper limit of 2. (U. W (tungsten) can be solid-solved | r .., high f, due to the increase in material in Japan, / base m lx) ^ promotes the fine precipitation of carbides, and also provides the so-called can prevent the agglomeration of the aforementioned broken compounds ^:

,,, (,, the stability of the molten metal is quite high. Therefore, in terms of such effects, w (two f because of the heat-check just like the foregoing) 4 k liters of material recovery, / dish Softening resistance, Cheat check resistance, and melting loss resistance. Therefore, W (tungsten) must be added. In order to fully exert the effect of w (tungsten), the amount of W (tungsten) added, The system must be at least 10%. However, too much

49〇494 Description of the invention (8) ΊΊη Fruit will ... Fat iron and Lei Xiaosi phase (one P plan / * Zhang leads to the so-called reduced vigor and high-temperature strength reduction of one to two) The amount of addition is limited to 1.0% to 0%? Within the range of 0, and by the female ^, ^ (11; 疋 is in the range of the lower limit of 2 · 0 / G, the upper limit of 7.0%. V (鈒) Combined with C (carbon), you # π several k ^ ^ ^. ^ To form a substrate, therefore, it helps to improve the "friction properties" due to Γ 为了. In order to exert the above-mentioned

Effect M (i, vanadium) must be added at a minimum of 0.01% or more 1: Stone Mountain π: Too much v (vanadium) is added, which can easily lead to: Γ: excessive coarsening of ΐ Occurred, on the contrary, it will also cause: the same as the 1's reduction in the strength of the dish, and therefore, it will have an adverse effect on the softening resistance and heat-check of the material at high temperatures. Therefore, the amount of V (hungry) is limited to the range of 0 · 0 1 ~ 1 · 0%. In addition, for the same reason as described above, the addition amount of v (vanadium) is preferably limited to the range of the lower limit of 0.1% and the upper limit of 0.5%.

Mb (锟 combines with C (carbon) to form carbides. Therefore, it contributes to increase the high-temperature strength of the material and promotes the miniaturization of so-called crystal grains. In order to bring out effects such as those described above, Nb (niobium) The amount of addition must be at least 0.01%. However, due to the excessive amount of Nb (niobium) added, it is quite easy to cause the so-called excessive coarsening of carbides, resulting in the so-called high-temperature strength of the material. Decrease and toughness occur, so it will adversely affect the softening resistance and heat-check resistance of the material at high temperatures. Therefore, Nb (niobium)

D: \ 2D-CODE \ 88-05 \ 88103501. Ptd page 12 5. Description of the invention (9) In addition, Gary 'is limited to the range of 0.01 to 1.0%. In addition, the addition amount of the niobium (niobium) is preferably limited to the range of b / o and the upper limit of 0.5% because the lower limit is 0.

The material Iϊ) can be dissolved in the matrix to improve the dream resistance and impact resistance of the material. Therefore, it can improve the ancient η and heat-check resistance of the material at high temperatures. In addition, since c0 # ,, and w can suppress the precipitation of the so-called δ fertilizer grain iron, it is possible to prevent the decrease in strength and vigour of 7 =. In addition, since the stability of the alloy to molten metal is relatively high, it can also 熔 τ ^ alloy's melt loss resistance. Therefore, it is necessary to add 0 (cobalt);: Once, the effect of Co (cobalt) is exhibited, so the addition of Co (cobalt) must be at least 1.0%. However, because c0 (beginning) is an "expensive element," the excessive c0 (which considerably increases the cost of clothing of the complete system to become Taigu and the ancients) is the cost of the clothing of Calgary in Rikou I. So Addition of Co (cobalt): within the range of m.〇 ~ 1〇 &quot;. And because of the aforementioned n0 / °, the addition amount of Co (cobalt) is preferably limited to the lower limit 2 0%, the upper limit is 8.0%.

As for the sample ‘c0 (drill) will be soft to all high temperature resistance! &quot; Installation (heabu check), and resistance to dissolution damage, bring about the phase: Therefore, in order to further improve the above-mentioned characteristics (within the scope of Co (drilling) (inscribed)). However, in co (cobalt) and)), Yu Shi M Park 4 —, w (tungsten: complementary relationship exists, so it can be replaced by W (crane) instead of some Quite expensive alloy element c

V. Description of the invention (10) I a) 4. Therefore, in order to improve the so-called B properties, heat-check properties, and chemical properties of materials at high temperatures, it is best to have a co⑷ content of two: quite a total amount of 罝, at 5 · Above 0%. In addition, ^ f) contains the same reason as described above, 'The CQ (total content of the content and the content of the two grounds *' is preferably limited to a range of 8.0% or more "crane) contains a small amount of β ), B (butterfly) also has some segregation on the crystal grain boundaries so that the crystal grain boundaries appear = it is possible to suppress the so-called dual-use at high temperature by acting like the foregoing:

The change phenomenon occurs and the high temperature strength of the material is maintained for a long time, so that the occurrence or spread of so-called cracks can be suppressed. Therefore, B 1 ′ is quite enough: to improve the material's resistance to softening at high temperatures by jh at_check). In order to give full play to the effect of b (butterfly), the amount of addition of this' B (butterfly) must be at least 0.003% or more.

Excessive addition of f⑷ will lead to the phenomenon of so-called ductility and low: On the contrary, it will cause adverse effects on the material's high-temperature ergonomics and heat_check properties. Therefore, the addition amount of B (Shi Peng) is limited to within the range of 0.003 to 0.04% ^. In addition, for the same reason as described above, the addition of 限定 to B (boron) is preferably limited to the range of the lower limit of 0.005% and the upper limit of 0.02%. N (nitrogen) is an alloy of Cr (chromium), v (hungry), and niobium (niobium) in the alloy, forming nitrides or carbonitrides to improve the high temperature strength of the material. At the same time, Matrix of reinforcement material (matrix). In addition, N (nitrogen) can also improve the corrosion resistance of the material at high temperatures.

, Description of the invention (ll) and strength. In order to fully do this, the added amount of N (nitrogen) gives off the aforementioned effect of N (gas) because the excessive N (gas system must be at least 0.005% or more. But the deterioration and thermal Workability V, addition, will cause the so-called welding characteristics to be added in an amount limited to 0 ° C. Therefore, N (nitrogen) has the same reason as above! Within the range of '5%: and because it is N The amount of (nitrogen) added is preferably in the range of lower limit of 0.01% and upper limit of 0.04%. The limit is between, and in addition, 'B + (rot) # 〇N (气), there is a certain degree of complement relationship exists 'Therefore, ^ has ensured the so-called high temperature of the material;

As a result, the softening and heat_check properties are sufficient. The ratio between the B (deletion) content and the N (nitrogen) content-ratio is preferably within the range of OH. &Quot;. Although the detailed reasons for the role of financial statements in the current situation are not clear, but, ‘

This fact means that: 纟 (boron) and / or N (nitrogen) compounds are formed in the alloy of the present invention; or, the crystals of B (boron) and N (nitrogen) are formed. Co-segregation and other phenomena occur at the grain boundaries and around the carbides. And, for the same reason as above, further, the ratio between the B (boron) content and the N (nitrogen) content, the bV / n ratio, is preferably 0.3 to 0. 7% of Within range. Here, as described above, the excessive addition of β (independent) and n (nitrogen) in common will cause the so-called alloy to reduce the ductility and early edge reduction at high temperatures. When Β (butterfly) and Ν (nitrogen) are added at the same time, the tendency like the foregoing is strengthened in a multiplicative effect. Especially when the total content of B (boron) content and N (nitrogen) content exceeds 0.05%

490494 V. In the description of the invention (12), the problem of poor processability due to the high heat of the material occurred. The total amount is preferably the same amount as the foregoing reasoning. It is also the best. In addition, the ratio of Fe (iron) in the melting of the light metal is mainly due to the reaction between light, And the reaction between them. Therefore, except Fe (iron), it is preferable that the total amount is 15.0% or more. Make the new content of the material step by step, and the content of (nitrogen) will reduce Fe (iron and the alloy), which is the cause of the alloy system. Therefore, the total amount of Fe (iron is preferably toughness at temperature to However, if π θ is changed, ϋ will decrease and ㈢ will cause production. Therefore, the content of B (butterfly) (nitrogen is 0.05% h.) Furthermore, the content of B (butterfly) ㈣ (nitrogen-limited) Under G. 04%: To further improve B's "two-dimensionality", therefore, it is best to be relative to the example. The aforementioned effect, ip 4 [^ Μ ^ Λ, F is based on speculation, A1 in the metal (Chain) and the alloy carry the light metal in the molten state 'in order to improve the melting resistance of the material, all the alloying elements are added above. In addition, who is more than half the amount of the gold element added: ：: In addition to Liyikouyexia, it is used for melting and refining. REM and Mg (magnesium) are used for deoxidation and desulfurization. At the same time, REM and Mg = Ca (calcium) are used as

(Calcium) is effective for high-temperature strength and high-temperature ductility of materials, and Ca. In addition, since REM is used for lifting materials. It is also a very effective element ', so that the effects of the so-called cracking oxidation resistance can be hindered, and the effects can be progressed quite effectively. Because of the (heat-check) improvement, it can be determined by: thermal cracking one or more of the aforementioned REM, Mg (magnesium) and Ca, and (including bow). gold

V. Description of Invention (13)

However, the amount of the alloying elements added to the above-mentioned Rem M) is excessive; (Mg) and c "are important to the heat processability of the material; it is a so-called significant obstacle) and. The alloy elements of rhenium :: Yes, marriage, heart (within the range of 0.001 ~ 0.05%), and "糸" is limited to the aforementioned ... "" Mg. " It is limited to be within the range of the lower limit &quot; two t. _ · 0 0 5%, upper limit 0.03% are the hot tool steels of the present invention, i &gt;,

Hot tool steel used in this state. For example, it can be used as a tool steel for casting, and as a mold for casting, a mold for a forming machine, a structural member for constructing a component, and an injection-limiting hot tool steel of the present invention.可:;: i use 1, that is, the thermal state of the present invention; widely available to the use of bright steel at a relatively high temperature when manufacturing operations, can directly handle salty place μ 'For example With a general electric melting furnace or

2 i (vim), and the melting structure of the prescribed composition of the present invention is the prescribed shape. Or |, in combination with (V; R Λ-Man and the Earth solve the second of the prescribed composition of the present invention: after J, the casting operation is performed. In accordance with the demand, the so-called cast alloy is subjected to the so-called After uniform diffusion treatment, using forging,

V. Description of the invention (14) The various processing, gold, etc. of exercise and rolling, etc., are processed into the prescribed method, and the reasonableness of casting out of the above description is reasonable. Then, in order to achieve reading, and also perform heat treatment such as annealing and tempering, etc., ^ == mechanical characteristics, so-called quenching is performed, and the alloy having the specified size 2 == ^ is mechanically processed. After processing, in order to meet the requirements :: = = mechanical heat treatment and tempering were previously performed, and mechanical properties were performed, and so-called quenching was performed.

In this way, by the operation like the above;; =; =; processing. Structural components for machines, injection molding machines, cast iron tools, casting molds, and extrusion molds, etc. 仏 concrete members, hot-forging properties, heat-check properties, Tian Lianger Only soluble in 4 shells. Therefore, compared to the conventional soil ~ and Mingzhi hot room tool steel system can be compared to: $: = 的 别 ⑽ 丨 steel, the present [exemplary] steel system. Enough phase, significantly extend the so-called Service life. Hereinafter, embodiments of the present invention will be described in detail. With the direct operation of the melting furnace (M), this equipment has a table! The composition shown is melted to produce a 50 kg steel block. In addition, in Table 2, the plant materials were also exposed to the (; 0 (cobalt) content and W (tungsten) content of the aforementioned test materials) ^ =

The ratio of the total content (Co + W), B (boron) content and N (nitrogen "content = total content (B + n), B (boron) content and N (nitrogen) 3 content ratio (B / N), all alloys other than Fe (iron), and some add 2: the total amount of addition (Σ). After the so-called homogeneous gas expansion element is implemented, the hot-forging process is used to make I melted the steel to produce a steel block at one place, and became a plate with a thickness of 30 mm and a width of 120 mm. For Xi ^, μ 田 命

490494 V. The test piece taken from the plate described in the description of the invention (15) is subjected to quenching treatment, that is, the test piece is subjected to a heat treatment of quenching for 3 hours at 1050 ° C, and then The test piece was placed in the air and subjected to a cooling treatment. [Table 1] Long No. test materials (% by weight) C Si Μη Ni Cr Mo WV Nb Co BN RE M Mg Ca Fe Materials of the present invention 1 0. 20 0. 11 0. 10 0. 21 9. 98 1.85 0. 21 0. 06 3. 01 0. 01 10 0. 01 93 Residual component 2 0. 20 0. 10 0. 10 0. 21 10 • 0 4 3. 99 0. 21 0. 06 3. 03 0. 01 20 0. 01 89 Residual component 3 0. 19 0. 10 0. 09 0. 20 10 • 0 5 5. 96 0. 20 0. 06 3. 05 0. 01 10 0. 02 32 Residual component 4 0. 16 0. 12 0. 10 0. 21 10 • 0 9 3. 97 0. 21 0. 05 5. 04 0. 01 20 0. 02 25 Residual component 5 0. 21 0. 13 0. 11 0 .20 9. 9 1 3. 98 0. 21 0. 06 5. 03 0. 01 20 0. 01 94 Residual content 6 0. 25 0. 12 0. 10 0. 21 9. 87 3. 97 0. 21 0. 06 5. 03 0. 01 10 0. 02 14 Residual content

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Description of the invention (16) 7 0. 19 0. 11 0. 10 0. 05 9. 44 1.. 5 1 3. 03 0. 20 0. 05 7. 55 0. 00 35 0. 01 88 Residual component 8 0. 22 0. 12 0. 11 0. 05 9. 35 1. 47 3. 02 0. 20 0. 04 7. 43 0. 00 70 0. 01 88 Residual component 9 0. 21 0. 12 0. 11 0. 05 9. 27 1. 49 2. 99 0. 20 0. 04 7. 51 0. 01 10 0. 01 92 Residual component 10 0. 20 0. 11 0. 10 0. 04 9. 50 1.. 48 2. 97 0. 21 0. 04 7. 52 0. 01 60 0. 02 23 Residual component 11 0. 21 0. 10 0. 12 0. 06 9. 33 1.. 50 3. 09 0. 22 0. 05 7. 82 0. 00 60 0. 01 90 0. 00 90 Residual content 12 0. 20 0. 10 0. 10 0. 05 9. 0 1 1. 30 2. 50 0. 20 0. 04 8. 00 0. 01 00 0. 01 80 0. 00 80 Residual content 13 0. 20 0. 11 0. 10 0. 04 9. 50 1. 48 2. 97 0. 21 0. 04 7. 52 0. 01 60 0. 02 23 0. 00 60 Residual component comparison material 14 0. 19 0. 11 0. 11 0. 05 9. 95 1. 45 3. 14 0. 20 0. 04 7. 50 0. 00 05 0. 01 90 Residual component 15 0. 25 0. 12 0. 13 0. 2 1 8. 04 1.. 44 0. 57 0. 01 10 0. 01 82 Residual component 16 0. 36 0. 11 0. 10 0. 20 8. 21 1.. 3 5 0. 75 0. 61 0. 05 0. 74 0. 01 10 0. 02 16 Residual component 17 0. 35 0. 10 0. 09 0. 20 8. 05 2. 99 0. 60 0. 00 05 0. 01 90 Residual content ΙΙΙ! 1Ι D: \ 2D-CODE \ 88-05 \ 88103501. Ptd Page 20 490494 Five 、 Explanation of the invention (17) 1 8 0. 35 0. 15 0. 12 0. 22 8. 01 1. 52 0. 60 1. 05 0. 00 05 0. 02 23 Residual ingredients are known in the prior art 19 0 37 1. 06 0. 37 0. 10 5. 26 1.. 32 0. 92 0. 00 05 0. 01 61 Residual component table division No. B + N (% by weight) B / N (specific ratio) Co + W (Wt%) Σ (wt%) 1 0.0303 0.57 4.86 15.76 2 0.0309 0.63 7.02 17.97 Ben 3 0.0342 0.47 9.01 19.93 4 0.0345 0.53 9.01 19.98 Hair 5 0.0314 0.62 9.01 19.87 6 0.0324 0.5 1 9.00 19.85 Ming 7 0.0223 0.19 10.58 22.25 8 0.0258 0.37 10.45 22.04 material 9 0.0302 0.57 10.50 22.02 10 0.0383 0.72 10.49 22.21 material 11 0.0250 0.32 10.91 22.53 12 0.0280 0.56 10.50 22.53 13 0.0383 0.72 10.49 22.21 ratio 14 0.0195 0.03 10.64 22.7 6 Compared with 15 0.0292 0.60 — 10.79 16 0.0326 0.5 1 1.49 12.5 1 material 17 0.0195 0.03 2.99 12.40 material 18 0.0228 0.02 1.05 12.04 conventional prior art material 19 0.0166 0.03 9.42 D: \ 2D-CODE \ 88-05 \ 88103501. ptd Page 21 490494 V. Description of the invention (18) Σ: Total addition amount of alloying elements other than Fe (iron) First, in order to evaluate the softening resistance of each test material at high temperature, therefore, the quenching treatment is performed. The subsequent test piece was held under γ 〇 ^^ for 100 hours, and then the aforementioned test piece was placed in a two-air atmosphere and subjected to a cooling treatment. After the surface of the test piece subjected to the aforementioned air cooling treatment was subjected to mirror polishing, the hardness of the aforementioned test piece was measured by a Rockwell hardness tester (C scale). When the difference between the hardness at this time and the hardness in the quenched state is represented by AHRC, the smaller the value of ΔΗK mentioned above, the better the softening resistance at high temperature of the test piece. In Figure i, the results of this test are not shown. From the results of the previous figure, it is quite obvious that the materials of the present invention are compared with the materials for comparison and the materials of the prior art. Quite good resistance to high temperatures. Next, in order to evaluate the heat-check resistance of each test material, the heat-check resistance was implemented by a self-made ^ heat-check test machine. test. The surface of the test piece was heated to 63 ° t, and the operation of water cooling was immediately performed as i cycles, and the cycle operation was repeatedly performed 10,000 times as described above. The test piece after the test is cut, and an optical microscope is used to observe the crack on the surface of the test piece due to a heat-ch-eck phenomenon. Record the length and number of all cracks in a cross section of the 10th part of the central part of each test piece, and total the total number of cracks. Page 22 D: \ 2D-CODE \ 88- 05 \ 88103501. Ptd 490494 V. Description of the invention (19) _ is used as the total length of the crack. The total crack length of 61 steel (test material No. 19) is compared with the conventional material :: Technology :: ί ί The total crack length of each test material is defined as: 2, broad coefficient. In other words, the smaller the relative cracking coefficient, the better the resistance to eat-check. In FIG. 2, the relative crack coefficients of the materials used in the test are shown. In FIG. 2, the thermal cracking of the material of the present invention is shown. Ka ^ -check resistance of conventional prior art materials. In addition, even if there are more than one type of REM, Mg (magnesium), or Ca (calcium μ (material for inspection) No. 11, 12, 13) in the second material of the present invention, in terms of heat resistance 1 枓, Can also get quite good results, '. C 6Ck The melting resistance of each of the test materials is tested individually because of the melting resistance test machine manufactured by the company. In the molten state, A1—M (II: The time until the melting loss is 100 hours. From before and after the test: = 2 to, the amount of loss is also calculated, and it is also calculated per unit time and each undercut. The amount of damage and the dissolution rate constant. The melting loss of the SKD61 steel (test material No. 19) relative to the habit === below is defined as the so-called dissolution rate constant of the material. Phase ;: Trial. That is to say, the above-mentioned relative melting loss velocity coefficient and speed are more favorable for melting loss resistance. In Figure 3, the smaller _ is, the relative melting of materials for testing materials is. The loss rate coefficient is% = mother-pairs in Figure 3, which is quite obvious. 1 D: \ 2D-CODE \ 88-05 \ 88103501. Ptd page 23 Melt resistance of refractory materials. Especially, Σ is better than the total addition amount of conventional materials in the prior art.) Alloy elements other than 18% by weight (iron) often have good melt loss characteristics. It shows alloy elements other than (iron) ... ;; Li Ke! It is learned that the 2 (except Fe * and the measured C. (Ming) is almost equal to the relative velocity coefficient of I. In addition, as shown in Figs. 1 and 2, the comparative material showing the special 4 is clearly shown. Its own resistance to fire and heat resistance, but the comparative material used in this test has higher resistance to softening and thermal cracking at high temperatures than the resistance of the materials of the present invention at high temperatures. Softness and heat-check. ,: 'An example of actual manufacturing' is using the material of the present invention] (Although it is an alloy with a composition of test material No. 7), the material of the present invention (an alloy equivalent to the composition of test material No. U) , For comparison (an alloy equivalent to the composition of the test material No. 14), and materials of the prior art of the feather head (equivalent to the order of the composition of the test material No. 01 to white) to produce magnesium Structural member for alloy injection molding machine. σ 1 Empty the induction melting furnace (VIM) and melt the specified eyebrow tree. Hunting Mayu

After the item, waste, reuse the electric slag remelting furnace (ESR), and then—A—decompose the above-mentioned raw materials in order to make the current μ ingots of kkUOmm. The so-called homogeneous diffusion is applied to each metal ingot.

Then, the metal key is subjected to a forging process, and a round bar of I 200 mm is finely added, and then a so-called annealing process is performed. 々 々Setting up, then, for the front

D: \ 2D-CODE \ 88-05 \ 88103501. Ptd Page 24 490494 V. Description of the invention (21) '-After the round bar with a diameter of 200 mm has been subjected to a quenching treatment of 105 °, Next, a so-called tempering treatment is performed between 600 and 5500 C, and then the aforementioned round rod with a diameter of 200 mm is processed into a predetermined size and shape by machining. . … It is suitable for parts manufactured as described above to facilitate the practical injection molding of magnesium alloys. In FIG. 4, the service life of each test material is shown. In FIG. 4, the service life of the material of the present invention is quite obvious, which is very significantly longer than the comparison materials and the known prior art. Life of the materials.

[Effects of the Invention] As is clearly shown in the above description, if the present invention is adopted, it can provide a so-called superior to SKD6 1 steel and possess softening resistance and heat crack resistance (heat_check) at high temperature with phase X. Hot-breaking tool steel with w destructive properties. Therefore, the hot work of the present invention is used on casting molds, casting two and two members, molds for injection molding machines, structural members, and high-temperature members such as yam i =: The hot tool steel of the invention can considerably extend the service life of the high-temperature components. Therefore, the invention of the invention is quite useful in industry. θ tool steel ’

[Simplified description of the figure] Fig. 1 shows the AHRC of each test material used for measuring the hard sounds (at 7 00 ° C, after maintaining ^, the air-cooling treatment should be performed). The Rockwell 1 hardness of the test piece in the state is directly subjected to the quenching place, &lt;

490494 V. Description of the invention (22) Graph of Rockwell (Rockwe 1 1) hardness of the test piece. Figure 2 shows the relative crack coefficient (relative to the total crack length of SKD61 steel of J IS (Japan Standards Association) of each test material) obtained by the results of the heat-check test. (The total crack length of each test material). Figure 3 is a graph showing the relative rubidium velocity coefficient (relative to the melting rate constant of SKD61 steel of j IS (Japan Standards Association) of each test material obtained from the dissolution test results. The melting rate constant of each test material). Fig. 4 is a graph showing the life of a structural member for a magnesium metal injection molding machine manufactured using various materials, which is obtained by using the actual machine.

Page 26 D: \ 2D-CODE \ 88-05 \ 88103501.ptd

Claims (1)

49049T on fi is Shen Wenglifan 88103501 A_η 1-1: Erruo 4 tool steels, which are characterized by containing the following components by weight: C (carbon) 0 · 1 0 ~ 0 · 50 0%; and S i (silicon) 0 · 5% or less; and Mn (manganese) 1.5% or less; and Ni (nickel) 1.5% or less; and Cr (chromium) 3.0 to 13.0%; and Mo (molybdenum) 0 to 3.0%; and W (tungsten) 1 · 0 to 8 · 0%; and V (vanadium) 0 · 0 1 to 1 · 0%; and Nb (niobium) 0 · 01 to 1 · 0%; and Co (cobalt) 1.0 to 10 · 0%; and B (boron) 0 · 0 0 3 to 0 · 0 4%; and, N (nitrogen) 0.0 0 5 -0.05%; also Contains more than one kind of REM of 0.001 to 0.05% by weight, 0.001 to 0.05% of Mg (magnesium, and 0.001 to 0.05% of Ca (calcium as a component; and the rest of the Fe (iron): and, inevitably, impurities. B. The hot tool steel as described in item 1 of the patent application, where the Co (cobalt) content and W (tungsten) content are 5.0% or more in total. L For example, the hot tool steel of the scope of patent application No. 1 in which the Co (cobalt) content and W (tungsten) content, Calculated as more than 5.0%. For the hot tool steel according to any one of claims 1 to 3, the ratio of B (boron) content to N (nitrogen) content B / N is 0. · Within the range of 2 to 1.0, and the total content of B (boron) content and N (nitrogen) content, B + N, is 0.05% or less. [If the scope of patent applications is 1 to 3 The hot tool steel of any one of them, in which the addition amount of all alloying elements other than Fe (iron) is 15.0% or more in total. _ 88103501.ptc Page 28 490494 _Case No. 88103501_Year Month and Day Amendment 丨 _L VI. Patent application scope I —_____ [For example, the hot tool steel of the patent application scope item 4, in which The total amount of all alloying elements is more than 15.0%. L A high-temperature component is a high-temperature component such as a casting mold, a structural component for a casting machine, a mold for an injection molding machine, a structural component, a hot-forging mold, and an extrusion mold, and is characterized by: It is composed of the hot tool steel as described in any one of the scope of patent applications No. 1 to 2. L A high-temperature component is a high-temperature component such as a casting mold, a structural component for a casting machine, a mold for an injection molding machine, a structural component, a hot-forging mold, and an extrusion mold, and is characterized by: It is composed of the hot tool steel as described in the patent application No. 4. L A high-temperature component is a high-temperature component such as a casting mold, a structural component for a casting machine, a mold for an injection molding machine, a structural component, a hot-forging mold, and an extrusion mold, and is characterized by: It is composed of the hot room tool steel described in the patent application No. 3. X '^ 1 0. — A kind of high-temperature components, which are high-temperature components such as casting molds, structural members for casting machines, molds for injection molding machines, structural members, hot forging dies, and extrusion dies, etc. It is characterized by being composed of the hot room tool steel described in item S of the scope of patent application. 88103501.ptc Page 29