JPS6046171B2 - Nickel-based alloy with improved hot workability - Google Patents

Description

【発明の詳細な説明】 本発明は、市販ニッケル基合金中に含まれている不純物
元素としてのイオウ、アルミニウムのほか、ケイ素も極
力微量化して、該合金本来の強度特性、耐食性、磁気特
性を損なうことなく、熱間加工性を改良したニッケル基
合金である。Detailed Description of the Invention The present invention aims to improve the strength, corrosion resistance, and magnetic properties inherent to the alloy by minimizing the amount of sulfur and aluminum as impurity elements contained in commercially available nickel-based alloys, as well as silicon. This is a nickel-based alloy with improved hot workability without any loss.

前記ニッケル基合金のうち、例えばインコネル６０給金
は加熱炉部品、熱交換器、タービン部品に、モネル４０
給金は無機合成化学、石油合成化学、油脂化学工業用の
配管部品に、またＰＣパーマロイ合金は高透磁率合金と
して磁気記録装置ヘッドコアに実用されている。本発明
の対象合金は、上記のものの外に、７０％Ｎｉ系電熱合
金、バスアロイＲ−２３５耐熱合金、モネルに耐食合金
、７８％Ｎｉパーマロイ磁性合金、インコネル６０１耐
熱合金、バスアロイ耐食合金、インコネル６３渕熱合金
、ユニテンプＣ３囲耐熱合金、ｊＶＡＲ−Ｍ２００耐熱
合金、ＩＮ−１０２耐熱合金、ＲＡ−３３側熱合金そし
てバスアロイＢ耐熱合金等である。Among the nickel-based alloys, for example, Inconel 60 is used for heating furnace parts, heat exchangers, and turbine parts, while Monel 40 is used for heating furnace parts, heat exchangers, and turbine parts.
PC permalloy alloy is used as a high magnetic permeability alloy for the head core of magnetic recording devices. In addition to the above, target alloys of the present invention include 70% Ni-based electric heating alloy, Bathalloy R-235 heat-resistant alloy, Monel corrosion-resistant alloy, 78% Ni permalloy magnetic alloy, Inconel 601 heat-resistant alloy, Bathalloy corrosion-resistant alloy, and Inconel 63. These include Fuchi heat-resistant alloy, Unitemp C3 heat-resistant alloy, jVAR-M200 heat-resistant alloy, IN-102 heat-resistant alloy, RA-33 side heat-resistant alloy, and Bath Alloy B heat-resistant alloy.

これらのニッケル基合金、とくにＮｉを６０％以上含有
するニッケル基合金は、熱間鍛造性、熱間圧延性などの
熱間加工性が劣るため、製造歩留が低いという欠点があ
る。These nickel-based alloys, especially nickel-based alloys containing 60% or more of Ni, have a drawback of low manufacturing yields due to poor hot workability such as hot forgeability and hot rolling properties.

ニッケル基合金の熱間加工性を改善するために、例えば
不純物元素としてのイオウ含有量を微量化する方法があ
るも、現行の精錬技術をもつてしては経済的ではない。In order to improve the hot workability of nickel-based alloys, for example, there is a method of reducing the amount of sulfur as an impurity element, but this is not economical using current refining technology.

またマグネシウムのごとき硫化物安定化元素を加えるこ
とも熱間加工性の改善に有効であるが、他の特性を害す
るおそれがあるから好ましくない。このため、各種ニッ
ケル基合金の熱間加工性におよぼす前記不純物元素の影
響を調査するために第１図に示す試験片を調製し、これ
を１、３００℃で熱間圧延して、熱間加工性の指標値で
ある限界圧延率を測定した。Addition of a sulfide stabilizing element such as magnesium is also effective in improving hot workability, but this is not preferred since it may impair other properties. Therefore, in order to investigate the influence of the impurity elements on the hot workability of various nickel-based alloys, test pieces shown in Figure 1 were prepared and hot-rolled at 1,300°C. The limit rolling rate, which is an index value of workability, was measured.

その結果、第２図に示すように、ニッケル基合金中のＳ
を０．００２％以下に微量化すればＳｉが０．０６％以
上、Ａｌが０．００５％以上含有するも、限界圧延率は
５０％以上に高められることがわかつた。As a result, as shown in Figure 2, S
It has been found that if the amount of Si is reduced to 0.002% or less, the limit rolling rate can be increased to 50% or more even though the Si content is 0.06% or more and the Al content is 0.005% or more.

しかし、これは溶解原料の厳選、入念な溶解精錬が必要
となり、経済的な面から好ましくない。一方、同図にお
いて、Ｓ■０．００３〜０．００８％における限界Ｊ圧
延率はＳｉレベルの高低により二分されており、低Ｓｉ
材の場合のそれは高いが、部ｉ材のそれは低い。すなわ
ち、Ｓ ■０．００３〜０．００８％において、Ｓｉお
よびＮをそれぞれ０．０５％以下、０．００４％以下に
微量化すれば限界圧延率４０％以上確保できること丁が
わかつた。またＳレベルを０．００８％以下に規制する
ことは現行の精錬技術をもつてすればさほど困難でなく
、前記Ｓレベルを０．００２％以下に規制する場合にく
らべて容易である。これらの知見にもとづいて、本願発
明合金の組成は、Ｎｉを６０％以上含有するニッケル基
合金おいて、Ｓ：０．０１％以下，Ａｌ：０．００４％
以下，Ｓｉ：０．０５％以下に限定した。However, this requires careful selection of melting raw materials and careful melting and refining, which is unfavorable from an economic standpoint. On the other hand, in the same figure, the limit J rolling ratio at S■0.003 to 0.008% is divided into two depending on the high and low Si level, and
It is high for the material, but it is low for the material i. In other words, it has been found that when Si and N are reduced to 0.05% or less and 0.004% or less, respectively, at 0.003 to 0.008% of S1, a critical rolling reduction of 40% or more can be ensured. Furthermore, regulating the S level to 0.008% or less is not so difficult using current refining technology, and is easier than regulating the S level to 0.002% or less. Based on these findings, the composition of the alloy of the present invention is a nickel-based alloy containing 60% or more of Ni, S: 0.01% or less, Al: 0.004%.
Hereinafter, Si was limited to 0.05% or less.

つぎに、本発明合金の特徴を代表的実施例により具体的
に説明する。Next, the characteristics of the alloy of the present invention will be specifically explained using representative examples.

不活性ガス雰囲気状態におけるプラズマ・アーク溶解、
または真空誘導溶解などにより第１表に示す化学成分の
供試材を溶製し、ついで第１図に示すごとき形状および
寸法の鋳塊を製造した。Plasma arc melting in an inert gas atmosphere,
Alternatively, test materials having the chemical components shown in Table 1 were melted by vacuum induction melting or the like, and then ingots having the shape and dimensions shown in FIG. 1 were produced.

つぎに、各鋳塊を巾２０！Ｔｌ／ｍに切断後第２表に示
す圧延条件で熱間圧延した結果、第１表に併記したとお
り、本発明材の限界圧延率は市販相当材のそれよりも著
しく向上していることがわかる。また、これら各供試材
の耐食性、高温強度、磁気特性等の諸性質を調べたとこ
ろ、本発明材は市販相当材と同等またはそれ以上である
ことを確認した。したがつて、従来材よりもＳｉ，Ｓ，
Ａｌなどの含有量を微量化することは、各種ニッケル基
合金本来の特性を損なうことなく、熱間加工性を改善で
きる技術的成果は著大である。Next, each ingot is 20mm wide! After cutting to Tl/m, the material was hot rolled under the rolling conditions shown in Table 2. As shown in Table 1, the limit rolling rate of the material of the present invention was significantly improved over that of the commercially available material. Recognize. Further, when various properties such as corrosion resistance, high-temperature strength, and magnetic properties of these test materials were investigated, it was confirmed that the materials of the present invention were equivalent to or better than commercially available equivalent materials. Therefore, Si, S,
Reducing the content of Al and the like is a significant technical achievement in that hot workability can be improved without impairing the inherent properties of various nickel-based alloys.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は限界圧延率実測用鋳塊の斜視図、第２図は限界
圧延率におよぼす％Ｓ，％Ｓｉおよび％Ａ１の影響を示
す図。FIG. 1 is a perspective view of an ingot for measuring the limit rolling rate, and FIG. 2 is a diagram showing the effects of %S, %Si, and %A1 on the limit rolling rate.

Claims (1)

【特許請求の範囲】[Claims] １ Ｎｉ：６０％以上を含有するニッケル基合金おいて
、Ｓ：０．０１％以下、Ａｌ：０．００４％以下、Ｓｉ
：０．０５％以下、に調整したことにより熱間加工性を
改良したニッケル基合金。1 In a nickel-based alloy containing Ni: 60% or more, S: 0.01% or less, Al: 0.004% or less, Si
: Nickel-based alloy with improved hot workability by adjusting to 0.05% or less.