JPH0798264B2 - Manufacturing method of high Cr wear-resistant white cast iron casting - Google Patents
Manufacturing method of high Cr wear-resistant white cast iron castingInfo
- Publication number
- JPH0798264B2 JPH0798264B2 JP63204780A JP20478088A JPH0798264B2 JP H0798264 B2 JPH0798264 B2 JP H0798264B2 JP 63204780 A JP63204780 A JP 63204780A JP 20478088 A JP20478088 A JP 20478088A JP H0798264 B2 JPH0798264 B2 JP H0798264B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- wear
- hardness
- white cast
- present
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鉱石、石炭、岩石などの粉砕ミル・セグメン
ト、輸送用管、浚渫船用部品などに使用される高Cr系耐
摩耗白鋳鉄鋳物の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a high Cr-based wear-resistant white cast iron casting for use in crushing mills / segments of ores, coal, rocks, transportation pipes, parts for dredgers, etc. Regarding manufacturing method.
従来、鉱石、石炭、岩石などの粉砕ミル・セグメントな
どの耐摩耗部には、例えば重量％でC:2.7〜3.5％、Ni:
4.0〜5.0％、Cr:2.0〜3.0％を含むニ・ハード鋳鉄など
のNi−Cr系白鋳鉄又は高Cr系白鋳鉄などが使用されてい
る。Conventionally, wear resistant parts such as crushing mills and segments of ore, coal, rock, etc., have, for example, C: 2.7 to 3.5% by weight%, Ni:
Ni-Cr-based white cast iron or high-Cr-based white cast iron such as Ni-hard cast iron containing 4.0 to 5.0% and Cr: 2.0 to 3.0% is used.
これらの材料を金属組織的に耐摩耗生の面からみると、
Ni−Cr系白鋳鉄はマルテンサイト基地中にCr炭化物(FeC
r)3Ｃ〔マイクロビツカース強さ（Hv）970〕を析出させ
ているのに対し、高Cr系白鋳鉄はマルテンサイト基地中
にCr炭化物(FeCr)7Ｃ〔マイクロビツカース硬さ（Hv）1
400〕を析出させている。From the viewpoint of wear resistance of these materials in terms of metal structure,
Ni-Cr white cast iron has a Cr carbide (FeC
r) 3 C [micro Vickers strength (Hv) 970] is deposited, whereas high Cr white cast iron has Cr carbide (FeCr) 7 C [micro Vickers hardness (Hv) in the martensite matrix]. ) 1
400] is deposited.
いずれの白鋳鉄もCr炭化物によつて硬さが高く、耐摩耗
性を有している。炭化物の析出形状は凝固区内の冷却速
度で支配され、金型鋳造が最も冷却速度が大きい。しか
しながら、これらの白鋳鉄性の耐摩耗部品は製作される
部品ごとに形状が異なつているため、多量生産には適す
るが製作費の嵩む金型の使用は好ましくなく、実用的に
は砂型製造が一般的に行われている。Each of the white cast irons has high hardness due to Cr carbide and has wear resistance. The precipitation shape of the carbide is governed by the cooling rate in the solidification zone, and die cooling has the highest cooling rate. However, since these white cast iron wear-resistant parts have different shapes depending on the parts to be manufactured, it is suitable for mass production, but the use of a mold that is expensive to manufacture is not preferable, and sand mold manufacturing is practically not possible. It is commonly done.
上述したように、金型は冷却速度が速く、かつ寸法精度
のよい鋳物が製造できるが、経済性のため砂型を使用せ
ざるを得ない状況にある。As described above, the mold can produce a casting having a high cooling rate and good dimensional accuracy, but it is inevitable to use the sand mold because of economical efficiency.
砂型は熱伝導率が悪い鋳物砂で形成されるため、大型鋳
物になる程、冷却速度が遅くなり、鋳物自身の実体機械
的性質が低下する。高Cr系白鋳鉄の場合も、砂型材は大
型化する程、炭化物形状は粗大化して硬さは低下する
が、特に鋳物内面硬さの低下が著しい。硬さ低下および
炭化物粗大化のため、耐摩耗性は低下し、耐摩耗製品の
耐久時間を短かくすると共に、粉砕粒が粗粒になるな
ど、耐摩耗機器の効果を著しく低下させる。Since the sand mold is made of foundry sand having poor thermal conductivity, the larger the casting, the slower the cooling rate and the lower the actual mechanical properties of the casting itself. Also in the case of high Cr white cast iron, the larger the sand mold material, the coarser the shape of the carbide and the lower the hardness, but the remarkable decrease in the hardness of the inner surface of the cast. Due to the decrease in hardness and the coarsening of carbides, the wear resistance is lowered, the durability of the wear-resistant product is shortened, and the effect of the wear-resistant equipment is remarkably reduced such that the crushed particles become coarse particles.
近年、粉砕ミルなどの摩耗部品においては長期間保守点
検を要しない無点検の装置への改良が強く要請されてい
る。この保守点検は主に、ニ・ハード鋳鉄、高Cr系白鋳
鉄を使用した摩耗部材の摩耗による加工修正や取り換え
などによるものである。これらの事情から従来使用され
てきたニ・ハード鋳鉄や高Cr系白鋳鉄の耐摩耗性では十
分でなく、耐摩耗性のさらに優れた高Cr系白鋳鉄鋳物の
開発が望まれている。In recent years, there has been a strong demand for improvement of wear-free parts such as a crushing mill to a non-inspected device that does not require maintenance and inspection for a long period of time. This maintenance and inspection is mainly due to machining corrections and replacements due to wear of wear parts made of hardened cast iron and high Cr white cast iron. Under these circumstances, the wear resistance of the dual hard cast iron and the high Cr white cast iron that have been conventionally used is not sufficient, and the development of a high Cr white cast iron casting having further excellent wear resistance is desired.
本発明は上記の技術水準および事情に鑑み、現在のニ・
ハード鋳鉄や高Cr系白鋳鉄の砂型鋳物よりも高硬度で耐
摩耗性の優れた高Cr系耐摩耗白鋳鉄鋳物を製造しうる方
法を提供しようとするものである。In view of the above technical level and circumstances, the present invention
An object of the present invention is to provide a method capable of producing a high Cr-based wear-resistant white cast iron casting having higher hardness and excellent wear resistance than a sand cast casting of hard cast iron or high Cr-based white cast iron.
本発明は重量％で、C:2.5〜3.5％、Si:0.5〜１％、Mn;
0.5〜1.5％、Cr:14〜17％、Mo:0.5〜３％、V:0.5〜２％
を含有し、残部が実質的にFeである高Cr系鋳鉄溶湯を、
主として金属粒で構成された鋳型に注湯し、凝固点から
該溶湯を急冷させることを特徴とする高Cr系耐摩耗白鋳
鉄鋳物の製造法である。In the present invention, C: 2.5-3.5%, Si: 0.5-1%, Mn;
0.5-1.5%, Cr: 14-17%, Mo: 0.5-3%, V: 0.5-2%
Containing a high Cr type cast iron molten metal with the balance being substantially Fe,
A method for producing a high Cr-based wear-resistant white cast iron casting, which comprises pouring the molten metal into a mold mainly composed of metal particles and quenching the molten metal from the freezing point.
従来の砂型鋳物は熱伝導率が約0.002cal/℃・cm・secと
いう鋳物砂で形成された鋳型で鋳造され、この鋳型を通
して冷却されるので、冷却速度が遅かつた。特に火型鋳
物になる程冷却速度が遅く、硬さがロツクエル硬さ61以
下に低下した。これに対し、本発明においては熱伝導率
が高い金属粒、例えば熱伝導率が約0.2cal/℃・cm・sec
と鋳物砂よりも著しく高い鋼粒を鋳型材として使用して
いるため、鋳型の冷却能は大きく、冷却速度は速くなり
炭化物を微細に析出させることが可能となり、該鋳型に
注湯する溶湯の成分と相俟つてロツクエル硬さ65以上の
硬さで、優れた耐摩耗性鋳物を製造することができる。The conventional sand mold casting has a low cooling rate because it is cast in a mold made of foundry sand having a thermal conductivity of about 0.002 cal / ° C · cm · sec and is cooled through this mold. In particular, as it became a fire-type casting, the cooling rate was slower and the hardness decreased to a Rockell hardness of 61 or less. On the other hand, in the present invention, a metal particle having a high thermal conductivity, for example, a thermal conductivity of about 0.2 cal / ° C · cm · sec.
And because the steel particles used are significantly higher than the casting sand as the mold material, the cooling capacity of the mold is large, the cooling rate is fast, and it becomes possible to precipitate carbides finely, and the molten metal to be poured into the mold is Combined with the components, it is possible to produce an excellent wear-resistant casting with a rocket hardness of 65 or more.
次に、本発明において使用する高Cr系鋳鉄の化学成分の
限定理由について説明する。なお以下の説明で％は重量
％を示す。Next, the reasons for limiting the chemical components of the high Cr cast iron used in the present invention will be described. In the following description,% means% by weight.
Ｃは本発明で使用する高Cr系鋳鉄の硬さ、耐摩耗性
及び靱性に重大な影響をおよぼす元素である。Ｃが2.5
％未満で硬さ及び耐摩耗性に寄与する晶出炭化物の量が
少なくなる不具合があり、一方、Ｃが3.5％を超えると
硬さは余り変化せず靱性が低下するので望ましくない。
従つてＣは2.5〜3.5％の範囲とした。C is an element that has a significant effect on the hardness, wear resistance and toughness of the high Cr cast iron used in the present invention. C is 2.5
%, There is a problem that the amount of crystallized carbide that contributes to hardness and wear resistance becomes small, while if C exceeds 3.5%, the hardness does not change so much and the toughness decreases, which is not desirable.
Therefore, C is in the range of 2.5 to 3.5%.
Siの添加量が0.5％未満では脱酸が不十分になると
共に鋳造性が悪くなり引巣の発生をもたらし、一方、１
％を超えると靱性が著しく低下する。従つSiは0.5〜１
％の範囲とした。If the amount of Si added is less than 0.5%, deoxidation becomes insufficient and castability deteriorates, resulting in the formation of cavities.
If it exceeds%, the toughness is significantly reduced. Therefore, Si is 0.5-1
The range is%.
Mnは脱酸及び硫黄の固定作用を発揮させる元素であ
る。この効果を出すためには最0.5％の添加が必要であ
るが、1.5％を超えると結晶粒が粗大化する不具合が生
ずる。従つてMnは0.5〜1.5％の範囲とした。Mn is an element that exerts deoxidizing and sulfur fixing effects. In order to obtain this effect, it is necessary to add up to 0.5%, but if it exceeds 1.5%, the problem that crystal grains become coarse occurs. Therefore, Mn is set to the range of 0.5 to 1.5%.
Crは硬さ及び耐摩耗性の向上に大きい効果を発揮さ
せる元素である。その添加量が14％未満では硬さの低い
(FeCr)3Ｃ炭化物の量が増加し、高硬度耐摩耗性をもた
らす(FeCr)7C3炭化物の量が減少するので十分な耐摩耗
性が得られない。また、17％を超えると(FeCr)7C3に他
に耐摩耗生を低下させる(FeCr)23C6炭化物が晶出して耐
摩耗性が低下する。従つてCrの添加量は14〜17％とする
のが好ましい。Cr is an element that exerts a great effect in improving hardness and wear resistance. If the amount added is less than 14%, the hardness is low.
Since the amount of (FeCr) 3 C carbides increases and the amount of (FeCr) 7 C 3 carbides that bring about high hardness wear resistance decreases, sufficient wear resistance cannot be obtained. On the other hand, if it exceeds 17%, (FeCr) 23 C 6 carbides which further deteriorate the wear resistance are crystallized in (FeCr) 7 C 3 and the wear resistance is lowered. Therefore, the amount of Cr added is preferably 14 to 17%.
Moは基地中に固溶されると共にMo炭化物Mo2C〔マイ
クロビツカース強さ1500〕を析出して硬さを高くし、か
つ耐摩耗性を向上させる。0.5％未満ではこの効果は少
なく、３％を超えると靱性が低下する。従つてMoは0.5
〜３％の範囲とした。Mo is solid-solved in the matrix and also precipitates Mo carbide Mo 2 C [micro Vickers strength 1500] to increase hardness and improve wear resistance. If it is less than 0.5%, this effect is small, and if it exceeds 3%, the toughness decreases. Therefore, Mo is 0.5
The range was up to 3%.
Ｖは炭化物形成傾向が極めて強く、非常に高い硬さ
を示すＶ炭化物VC〔マイクロビツカース硬さ2800〕を生
ずるので耐摩耗性の向上に極めて有効な元素である。そ
の添加量としてはＶ炭化物VCを得るには0.5％以上の添
加が必要であり、上限はMoとの複合添加になるので靱性
を保持する上から２％未満とした。V has an extremely strong tendency to form a carbide and produces a V carbide VC [Micro Vickers hardness 2800] exhibiting a very high hardness, and is an extremely effective element for improving wear resistance. The amount added is required to be 0.5% or more in order to obtain V carbide VC, and the upper limit is a composite addition with Mo, so it was set to less than 2% from the viewpoint of maintaining toughness.
本発明について実施例をあげ、更に具体的に説明する。 The present invention will be described more specifically with reference to examples.
本発明において使用する高Cr系鋳鉄（以下、本発明使用
材と略称する）の化学成分を第１表に示す。供試材No.1
〜No.5は本発明使用材で、No.6〜No.10は比較材であ
り、No.はニ・ハード鋳鉄である。Table 1 shows the chemical composition of the high Cr cast iron (hereinafter, abbreviated as the material used in the present invention) used in the present invention. Sample material No.1
No. 5 to No. 5 are materials used in the present invention, No. 6 to No. 10 are comparative materials, and No. is hard-hard cast iron.
第２表にNo.1〜No.5供試材を用い本発明方法によつて得
られた鋳物（以下、本発明鋳物と略称する）、本発明使
用材と略同一化学成分であるNo.6,No.7供試材を用い従
来の砂型で鋳造された鋳物及び化学成分が本発明使用材
の範囲外のNo.8〜No.10供試材を用い本発明で使用する
金属粒で構成された鋳型によつて得られた鋳物の機械的
性質を示す。（後者の２例を比較鋳物と略称する） 本発明鋳物の硬さはロツクエル硬さ（Hv）65以上が得ら
れているが、比較鋳物の硬さHvは61以下である。すなわ
ち、本発明鋳物はHRC65以上という高い硬さを有するこ
とが判る。これらの鋳物はニ・ハード鋳鉄を使用したも
のを除き、950℃×２時間保持後、空冷したものであ
る。 In Table 2, castings obtained by the method of the present invention using No. 1 to No. 5 test materials (hereinafter abbreviated as castings of the present invention) and No. 1 having substantially the same chemical composition as the materials used in the present invention. Metal particles used in the present invention using No. 8 to No. 10 test materials whose castings and chemical components were cast in the conventional sand mold using No. 6 and No. 7 test materials. Figure 3 shows the mechanical properties of the casting obtained with the configured mold. (The latter two examples are abbreviated as comparative castings) The hardness of the castings of the present invention is Rockwell hardness (Hv) of 65 or more, but the hardness Hv of the comparative castings is 61 or less. That is, it is understood that the casting of the present invention has a high hardness of HRC65 or higher. These castings, except for those using ni-hard cast iron, were air-cooled after being held at 950 ° C. for 2 hours.
さらに、上記の本発明鋳物、比較鋳物及びニ・ハード鋳
鉄を砂型で鋳造した鋳物などについての摩耗試験結果を
第３表に示す。 Further, Table 3 shows the results of the wear test for the above-mentioned castings of the present invention, the comparative castings, and the castings obtained by casting the di-hard cast iron in the sand mold.
この摩耗試験は回転式摩耗試験機で粒径２〜5mmの硅石
中を10時間回転粉砕させ、その摩耗減量により互いの耐
摩耗性を比較したものである。 In this abrasion test, silica stones having a particle size of 2 to 5 mm were rotationally crushed for 10 hours by a rotary abrasion tester, and the abrasion resistances of the stones were compared by reducing the abrasion loss.
第３表から炭化物を微細に析出させた本発明鋳物は比較
鋳物、従来鋳物に比べ耐摩耗性が優れていることが判
る。It can be seen from Table 3 that the castings of the present invention in which carbides are finely precipitated are superior in wear resistance to comparative castings and conventional castings.
本発明の実施例において用いた金属粒鋳型は平均粒径0.
01〜4mmの鋼粒に硅酸ソーダ0.5％添加後、CO2ガスで硬
化させたもので、砂型に比較して熱伝導率が著しく優れ
ているものである。The metal particle mold used in the examples of the present invention has an average particle size of 0.
It is made by adding 0.5% of sodium silicate to a steel grain of 01 to 4 mm and then hardening it with CO 2 gas. It has a significantly higher thermal conductivity than the sand mold.
本発明の実施例においては上述したように金属粒として
鋼粒を使用したものであるが、本発明の金属粒はこれに
限定されるものではなく、鋼粒と同等な機能を有する金
属粒ならばどのようなものでも使用できるものである。In the examples of the present invention, steel particles are used as the metal particles as described above, but the metal particles of the present invention are not limited to this, and if the metal particles have the same function as the steel particles. Anything can be used.
本発明によつて得られた鋳物を、各種鉱石や石炭などの
粉砕ミル・セグメント、浚渫船用部品などとして使用す
れば、従来品よりも耐摩耗性にも優れているので、従来
品よりも摩耗により取り換えの頻度を大幅に低減するこ
とができる。このことからプラントの保守点検を長期間
省略でき、運転コストの大幅な低減をもたらすことがで
きる。When the casting obtained according to the present invention is used as a crushing mill segment of various ores or coal, a part for dredgers, etc., it is superior in wear resistance to conventional products, and therefore wears more than conventional products. Thus, the frequency of replacement can be significantly reduced. For this reason, maintenance and inspection of the plant can be omitted for a long period of time, resulting in a significant reduction in operating costs.
Claims (1)
Mn:0.5〜1.5％、Cr:14〜17％、Mo:0.5〜３％、V:0.5〜
２％を含有し、残部が実質的にFeである高Cr系鋳鉄溶湯
を、主として金属粒で構成された鋳型に注湯し、凝固点
から該溶湯を急冷させることを特徴とする高Cr系耐摩耗
白鋳鉄鋳物の製造法。1. By weight%, C: 2.5-3.5%, Si: 0.5-1%,
Mn: 0.5-1.5%, Cr: 14-17%, Mo: 0.5-3%, V: 0.5-
A high Cr cast iron molten metal containing 2% and the balance being substantially Fe is poured into a mold mainly composed of metal particles, and the molten metal is rapidly cooled from the freezing point. Abrasion white cast iron casting manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63204780A JPH0798264B2 (en) | 1988-08-19 | 1988-08-19 | Manufacturing method of high Cr wear-resistant white cast iron casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63204780A JPH0798264B2 (en) | 1988-08-19 | 1988-08-19 | Manufacturing method of high Cr wear-resistant white cast iron casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0255659A JPH0255659A (en) | 1990-02-26 |
| JPH0798264B2 true JPH0798264B2 (en) | 1995-10-25 |
Family
ID=16496224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63204780A Expired - Fee Related JPH0798264B2 (en) | 1988-08-19 | 1988-08-19 | Manufacturing method of high Cr wear-resistant white cast iron casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0798264B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104099533A (en) * | 2013-04-09 | 2014-10-15 | 丁年花 | Seven-element alloy casting with high chromium, nickel and tungsten content and production process thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5222957B2 (en) * | 1971-09-20 | 1977-06-21 | ||
| JPS57101645A (en) * | 1980-12-15 | 1982-06-24 | Kubota Ltd | Composite sleeve roll for rolling h-steel and preparation thereof |
| JPS6164814A (en) * | 1984-09-04 | 1986-04-03 | Nissan Motor Co Ltd | Production of spheroidal graphite cast iron |
-
1988
- 1988-08-19 JP JP63204780A patent/JPH0798264B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0255659A (en) | 1990-02-26 |
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