JPH0320440A - 5% cr series heat-resistant steel having excellent high temperature strength - Google Patents
5% cr series heat-resistant steel having excellent high temperature strengthInfo
- Publication number
- JPH0320440A JPH0320440A JP15464589A JP15464589A JPH0320440A JP H0320440 A JPH0320440 A JP H0320440A JP 15464589 A JP15464589 A JP 15464589A JP 15464589 A JP15464589 A JP 15464589A JP H0320440 A JPH0320440 A JP H0320440A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- creep rupture
- rupture strength
- resistant steel
- strength
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 12
- 238000007254 oxidation reaction Methods 0.000 abstract description 12
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 19
- 239000002244 precipitate Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 6
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
「発明の目的」
本発明は高温強度に優れた５％Ｃｒ系耐熱鋼に係り、比
較的低廉な５％Ｃｒ系耐熱鋼のクリープ破断特性を大幅
に改善し、高温強度に優れた低合金耐熱綱を提供しよう
とするものである。Detailed Description of the Invention Object of the Invention The present invention relates to a 5% Cr-based heat-resistant steel with excellent high-temperature strength. The purpose is to provide a low-alloy heat-resistant steel with excellent strength.
（産業上の利用分野）
火力発電プラントや化学プラント用などに用いられる耐
熱鋼。(Industrial application field) Heat-resistant steel used for thermal power plants, chemical plants, etc.
（従来の技術）
耐熱鋼として、２％Ｃ ｒ − Ｉ Ｍ ｏ 鋼は高い
クリープ破断強さを有するものとして広く使用されてい
る。また特開昭６３−６２８４８号公報にみられるよう
に２ ’Ａ Ｃ ｒ − Ｉ Ｍ ｏをベースとし、ｖ
１Ｎｂなどを添加してクリープ破断強さをより高めた鋼
も発表されている。(Prior Art) As a heat-resistant steel, 2% Cr-IMo steel is widely used as it has high creep rupture strength. Also, as seen in Japanese Patent Application Laid-Open No. 63-62848, it is based on 2'A C r-IM o,
Steels with higher creep rupture strength by adding 1Nb have also been announced.
一方５％Ｃｒ系耐熱鋼は６００℃程度の高温まで長時間
使用可能な耐酸化性を有している。On the other hand, 5% Cr heat-resistant steel has oxidation resistance that allows it to be used for long periods of time at temperatures as high as about 600°C.
更に９％Ｃｒ系やｌ２％Ｃｒ系の耐熱鋼は耐酸化性に優
れ、特開昭６２−１８００３９号や特開昭６０−２４３
５３号公報などに発表されている。Furthermore, heat-resistant steels of 9% Cr type and 12% Cr type have excellent oxidation resistance, and are disclosed in JP-A-62-180039 and JP-A-60-243.
This was announced in Publication No. 53, etc.
（発明が解決しようとする課題） 上記した従来のものにおいては夫々に問題がある。(Problem to be solved by the invention) Each of the above-mentioned conventional devices has its own problems.
即ち前記した２ ％ Ｃ ｒ − Ｉ Ｍ ｏ ！！４
はＣｒ量が低いため、５５０℃以上の高温、長時間の使
用においては耐酸化性が不充分である。That is, the above-mentioned 2% Cr-IMo! ! 4
Since the content of Cr is low, the oxidation resistance is insufficient when used at high temperatures of 550° C. or higher and for long periods of time.
又５％Ｃｒ系耐熱鋼は、例えばＪＩＳ ＳＴＢＡ ２
５ （ ５ Ｃ ｒ − ０． ５ Ｍ ｏ鋼）の
高温強度にみられるように、そのクリープ破断強度は２
’Ａ Ｃ ｒ −ＩＭｏ鋼（Ｊ Ｉ Ｓ ＳＴＢＡ
２ ４）よりもかなり劣っている。In addition, 5% Cr heat-resistant steel is, for example, JIS STBA 2
As seen in the high temperature strength of 5Cr-0.5Mo steel, its creep rupture strength is 2
'A C r -IMo steel (J I S STBA
2) It is considerably inferior to 4).
これらに対し９％Ｃｒｉｂや１２％Ｃｒ鋼は耐酸化性が
良いとしてもかなり高価であり、また靭性も低い。例え
ば９％Ｃｒ系鋼に関する前記特開昭６２−１８００３９
号のものは＋２０℃の吸収工不ルギーが７．１〜１６．
４ｋｇｉｍと低いものであり、１２％Ｃｒｔｌｉに関す
る特開昭６０−２４３５３号公報の破面遷移温度も＋２
０℃以上と靭性に劣っ＝いる。On the other hand, 9% Crib and 12% Cr steels are quite expensive, even if they have good oxidation resistance, and also have low toughness. For example, the above-mentioned Japanese Patent Application Laid-Open No. 62-180039 regarding 9% Cr steel
No. 2 has an absorption coefficient of 7.1 to 16 at +20°C.
The fracture surface transition temperature of JP-A No. 60-24353 regarding 12% Crtli is also +2
If the temperature is 0°C or higher, the toughness is poor.
「発明の構或」
（課題を解決するための手段）
本発明は上記したような従来のものの課題を解決するよ
うに創案されたものであって、以下の如くである。"Structure of the Invention" (Means for Solving the Problems) The present invention has been devised to solve the problems of the prior art as described above, and is as follows.
１． Ｃ ： ０．０２〜０．１５ｗｔ％、Ｓｉ：１．
５組％以下、Ｍｎ ： ０． １ 〜２． ０ｗｔ％、
Ｃｒ： ４．０〜６．０ｗｔ％、Ｍｏ ： ０． １
〜１．５ｗｔ％、Ｎｉ ： １． ０ｗｔ％以下、Ｖ
： ０．０５〜０．４ｈｔ％、Ｎｅｏ。０１５〜０．０
５０ｗｔ％を含有し、残部がＦｅおよび不純物からなる
ことを特徴とする高温強度に優れた５％Ｃｒ系耐熱鋼。1. C: 0.02 to 0.15 wt%, Si: 1.
5% or less, Mn: 0. 1-2. 0wt%,
Cr: 4.0 to 6.0 wt%, Mo: 0. 1
~1.5wt%, Ni: 1. 0wt% or less, V
: 0.05-0.4ht%, Neo. 015~0.0
A 5% Cr-based heat-resistant steel with excellent high-temperature strength, characterized by containing 50 wt% and the remainder consisting of Fe and impurities.
２． Ｃ ： ０．０２〜０．１５ｗｔ％、Ｓｔ ：
１． ５ｗｔ％以下、Ｍｎ ： ０． １ 〜２． ０
ｗｔ％、Ｃｒ： ４．０〜６．０ｗｔ％、Ｍｏ ： ０
． １ 〜１．５ｗｔ％、Ｎｉ ： １． ０ｗｔ％以
下、Ｖ ： ０．０５〜０．４０ｅｖｔ％、Ｎ ： ０
．０１５〜０．０５０ｗｔ％、を含有すると共に、
Ｎｂ：０．０１〜０．１５ｗｔ％
を含有し、残部がＦｅおよび不純物からなることを特徴
とする高温強度に優れた５％Ｃｒ系耐熱洞。2. C: 0.02-0.15wt%, St:
1. 5wt% or less, Mn: 0. 1-2. 0
wt%, Cr: 4.0 to 6.0 wt%, Mo: 0
．． 1 to 1.5 wt%, Ni: 1. 0wt% or less, V: 0.05-0.40evt%, N: 0
．． 015 to 0.050 wt%, Nb: 0.01 to 0.15 wt%, and the balance is Fe and impurities.
（作用）
本発明における戒分範囲限定理由を吋％（以下１′Ｌに
％という）により説明すると、以下の如くである。(Operation) The reason for limiting the range of precepts in the present invention is explained in terms of 吋% (hereinafter referred to as % in 1'L) as follows.
Ｃは、鋼に高い引張強度を得るために必要であり、又Ｃ
ｒ ％ Ｍ ｏ −． Ｖと共に炭化物を形成し、ク
リープ破断強さを上昇させる。このＣが０．０２％未満
ではこれらの作用を適切に得ることができず、一方この
Ｃが０．１５％を超えると溶接性が低下するので０．０
２〜０．１５％とした。C is necessary to obtain high tensile strength in steel, and C
r % Mo −. It forms carbides together with V and increases creep rupture strength. If this C is less than 0.02%, these effects cannot be obtained appropriately, while if this C exceeds 0.15%, weldability will deteriorate, so 0.0
The content was set at 2 to 0.15%.
Ｓｉは、脱酸剤として作用し、耐酸化性を向上させるが
、１．５％を超えて添加すると靭性が低下するので、１
．５％を上限とした。Si acts as a deoxidizing agent and improves oxidation resistance, but if it is added in an amount exceeding 1.5%, the toughness decreases.
．． The upper limit was set at 5%.
Ｍｎは、Ｓｉと同様に脱酸剤として作用し、また熱間加
工性に有害な不純物ＳをＭｎＳとして固定する。更にＮ
の固溶量を増すのに有効な元素であって、Ｍｎの含有量
が０．１％未満ではこれらの作用を適切に得難いことと
なり、一方２．０％を超えると靭性が低下するので０．
１〜２． ０％とした。Like Si, Mn acts as a deoxidizing agent, and also fixes impurity S, which is harmful to hot workability, as MnS. Further N
It is an element effective in increasing the amount of solid solution of ．．
1-2. It was set to 0%.
Ｃｒは、高温における耐酸化性を高めるもので、このＣ
ｒが４．０％未満では６００℃程度の高温での長時間使
用には耐酸化性に問題がある。これに対しＣｒが６．０
％を超えると高価とならざるを得す、しかも溶接性や靭
性が低下する。従ってＣｒ含有量は４．０〜６．０％と
した。Cr increases oxidation resistance at high temperatures;
When r is less than 4.0%, there is a problem in oxidation resistance when used for a long time at a high temperature of about 600°C. On the other hand, Cr is 6.0
%, it becomes expensive and weldability and toughness deteriorate. Therefore, the Cr content was set to 4.0 to 6.0%.
ＭＯは、固溶強化および炭化物形威による析出強化作用
があり、クリープ破断強さを向上させる。MO has solid solution strengthening and precipitation strengthening effects due to carbide formation, and improves creep rupture strength.
このＭＯが０．１０％未満ではこれらの効果を有効に得
られず、一方１．５％を超えると高価となると共に溶接
性が低下するので、０．１０〜１．５％とすることが必
要である。If this MO is less than 0.10%, these effects cannot be obtained effectively, while if it exceeds 1.5%, it becomes expensive and weldability decreases, so it is recommended to set it to 0.10 to 1.5%. is necessary.
Ｎｉは、靭性を向上させる元素であるが、１％を超える
と高価となり、しかも溶接性を低下する。Ni is an element that improves toughness, but if it exceeds 1%, it becomes expensive and reduces weldability.
このため１．０％以下とし、好ましくは０．３％以下と
する。Therefore, the content should be 1.0% or less, preferably 0.3% or less.
■は、Ｎと結合してＶＮを形威し、このＶＮの分散強化
によりクリープ破断強さを著しく高める効果がある。こ
の■が０．０５％未満ではそうした作用を的確に得難く
、一方０． ４ ０ ％を超えるとＶＮが高温焼ならし
時に未固溶析出物として残存し、逆にクリープ破断強さ
が低下する。又、溶接性も低下する。従ってＶ含有量は
０．０５〜０．４０％とした。(2) combines with N to form VN, and this dispersion strengthening of VN has the effect of significantly increasing creep rupture strength. If this ■ is less than 0.05%, it is difficult to obtain such an effect accurately; If it exceeds 40%, VN remains as an undissolved precipitate during high-temperature normalization, and the creep rupture strength conversely decreases. Furthermore, weldability also deteriorates. Therefore, the V content was set to 0.05 to 0.40%.
Ｎは、ＶＮ形或によってクリープ破断強度を著しく高め
る作用があり、このＮが０．０１５％未満ではこの効果
が明瞭でなく、一方０．０５％を超えると健全な鋼塊が
得にくくなり、又溶接性も低下する。これらの関係から
Ｎは０．０１５〜ｏ． ｏ ｓ ｏ％とした。N has the effect of significantly increasing creep rupture strength depending on the VN type, and if this N content is less than 0.015%, this effect is not obvious, while if it exceeds 0.05%, it becomes difficult to obtain a sound steel ingot. Furthermore, weldability also deteriorates. From these relationships, N is 0.015 to o. oso%.
Ｎｂは、それが添加されることにより炭化物、窒化物を
形威し、クリープ破断強さを向上させる．このＮｂ含有
量が０．０１％未満では所望の作用が得られず、一方０
．１５％を超えると溶接性が低下するので、０．０１−
０．１５％とすることが必要である。When Nb is added, it forms carbides and nitrides and improves creep rupture strength. If the Nb content is less than 0.01%, the desired effect cannot be obtained;
．． If it exceeds 15%, weldability deteriorates, so 0.01-
It is necessary to set it to 0.15%.
５％Ｃｒ系耐熱鋼においてはＶを添加してもバナジウム
カーバイドは析出し難く、殆んどのバナジウムが鋼中に
固溶してしまう。従ってバナジウムカーバイドの分散強
化によるクリープ破断強さの向上は僅かである。しかし
０．０５〜０．４０％のＶと共に窒素を０．０１５〜０
．０５０％含有させることによりバナジウムナイトライ
ドが多量に析出し、このバナジウムナイトライドの分散
強化によってクリープ破断強さの大幅な上昇が期待でき
る。In 5% Cr heat-resistant steel, vanadium carbide is difficult to precipitate even when V is added, and most of the vanadium ends up being dissolved in the steel. Therefore, the creep rupture strength is only slightly improved by dispersion strengthening of vanadium carbide. However, nitrogen with 0.05-0.40% V
．． By containing 050%, a large amount of vanadium nitride is precipitated, and a significant increase in creep rupture strength can be expected due to the dispersion strengthening of this vanadium nitride.
（実施例）
次の第ｌ表には本発明鋼の若干例について、又第２表に
は比較鋼についての化学或分、熱処理後のクリープ破断
強さ、Ｏ℃シャルビー吸収エネルギーを示す。(Example) The following Table 1 shows some examples of the steels of the present invention, and Table 2 shows the chemical properties, creep rupture strength after heat treatment, and O°C Charby absorbed energy of comparative steels.
比較鋼の末尾に示した符号１１のものは、２ＡＣｒ−Ｉ
Ｍｏ鋼（ＪＩＳ ＳＴＢＡ２４）であり、９３０℃に
加熱後、７２０℃で恒温焼鈍の熱処理を行った。又本発
明鋼および比較鋼の上記符号１１のものを除く、すべて
は１１００℃の高温焼ならし、７４０℃の焼戻しを行っ
た。The steel with code 11 shown at the end of the comparison steel is 2ACr-I
It was Mo steel (JIS STBA24), and was heated to 930°C and then subjected to constant temperature annealing at 720°C. In addition, all of the steels of the present invention and comparative steels, except for the above-mentioned steel No. 11, were normalized at a high temperature of 1100°C and tempered at 740°C.
本発明調のものは何れも６００℃Ｘ１０’ｈｒのクリー
プ破断強さが１１．０〜１ ２． ５ ｋｇｆ／１１２
６５０℃Ｘ２００ｈｒのクリープ破断強さがｌＯ．０〜
１ １． ５ ｋｇｆ／ｍ” と高く、２ ％ Ｃ ｒ
Ｉ Ｍｇ鋼（比較鋼の符号１１）よりも高温強度が
高い。又０℃のシャルピー吸収エネルギーは３０ｋｇｆ
−ｍ以上であって、靭性も良好である。All of the products according to the present invention have a creep rupture strength of 11.0 to 1 at 600°C for 10'hr. 5kgf/112
The creep rupture strength at 650°C for 200 hours is lO. 0～
1 1. 5 kgf/m” and 2% Cr
I High temperature strength is higher than Mg steel (comparative steel, code 11). Also, the Charpy absorbed energy at 0℃ is 30kgf.
-m or more, and the toughness is also good.
これに対し第２表の比較鋼においては夫々に以下のよう
な問題がある。On the other hand, the comparative steels shown in Table 2 each have the following problems.
符号１の比較鋼は本発明鋼に比しｃｌが低いためクリー
プ破断強さが稍々低い。Comparative steel No. 1 has a lower cl than the steel of the present invention, so its creep rupture strength is slightly lower.
比較鋼２は本発明銅よりＳｉが高いためシャルピー吸収
エネルギーが２４ｋｇｆ−ｍと低下している。Comparative steel 2 has a higher Si content than the copper of the present invention, so its Charpy absorbed energy is lower at 24 kgf-m.
比較綱３は、Ｍｎ量が本発明範囲を超えているためやは
りシャルピー吸収エネルギーが低下している。Comparative steel 3 has a Mn content exceeding the range of the present invention, so the Charpy absorbed energy is also reduced.
比較鋼４は、本発明鋼に比しＭｏ量が低いので、クリー
プ破断強さが稍々低い。Comparative Steel 4 has a lower amount of Mo than the steel of the present invention, so its creep rupture strength is slightly lower.
比較鋼５は、ｖｌが本発明範囲に達していないのでクリ
ープ破断強さが更に低いものとなっている。Comparative Steel 5 has an even lower creep rupture strength since vl does not reach the range of the present invention.
比較洞６は、本発明鋼に比しＶ−ｉが反対に多いためク
リープ破断強さが稍々低い。Compared to the steel of the present invention, Comparative Cavity 6 has a higher Vi than the steel of the present invention, so its creep rupture strength is slightly lower.
比較鋼７および８は、本発明鋼に比しＮ量が低いため、
何れもクリープ破断強さが本発明のレベルに達していな
い。Comparative steels 7 and 8 have a lower N content than the steel of the present invention, so
In either case, the creep rupture strength did not reach the level of the present invention.
比較鋼９および１０は、本発明鋼に比較してＣｒ量が低
く、またＮＩも低い鋼であるが、これらのものはシャル
ピー吸収エネルギーが本発明鋼より低い。またＣｒ量が
低いため５５０℃以上の高温における長時間使用には耐
酸化性上難点がある。Comparative steels 9 and 10 have lower Cr content and lower NI than the steel of the present invention, but these steels have lower Charpy absorbed energy than the steel of the present invention. Furthermore, since the amount of Cr is low, there is a problem in terms of oxidation resistance when used for a long time at high temperatures of 550° C. or higher.
比較ｗ４１１の２％Ｃｒ ＩＭｏ鋼も、Ｃｒｉｌが低
いため高温長時間使用には耐酸化性上問題がある。Comparative w411 2% Cr IMo steel also has a problem in terms of oxidation resistance when used at high temperatures for long periods of time due to its low Cril.
添付図面第１図にはＣｒ以外の戒分においては略同レヘ
ル（０．１％Ｃ − ０． ３％Ｓｉ ０．５％Ｍｎ
−０．５％Ｍｏ−０．０１％Ｎ ｉ − Ｑ， ３％Ｖ
− ０．００ ２％Ｎ）で、Ｃｒを１〜５％の範囲で
変えた前記比較鋼９（１．０９％Ｃｒ）、比較ｔ！ｔ４
１０（３．１４％Ｃｒ）および比較ａ４７ （５．０
２％Ｃ ｒ） （Ｆ）析出物中ｖ４と鋼中Ｏｒの関係を
示したが、１％Ｃｒ鋼である比較調９では析出物中■が
０． ２％以上認められるけれども鋼中Ｃｒ量の増加と
共に減少し、５％ＣｒｌｉｊＪ（比較鋼７）では析出物
中Ｖが０．０４％程度となる。このことは１％Ｃｒｌｉ
Ｊではバナジウムカーバイドが多量に析出するが、５％
ＣｒＩｉｌではバナジウムカーバイドが析出し難＜、バ
ナジウムは殆んど鋼中に固溶してしまうことを示してい
る。Figure 1 of the attached drawing shows that the precepts other than Cr are approximately the same level (0.1%C - 0.3%Si 0.5%Mn).
-0.5%Mo-0.01%Ni-Q, 3%V
- 0.00 2% N) and the comparative steel 9 (1.09% Cr) with Cr varied in the range of 1 to 5%, comparative t! t4
10 (3.14% Cr) and comparison a47 (5.0
2% Cr) (F) The relationship between v4 in the precipitates and Or in the steel was shown, but in comparative sample 9, which is a 1% Cr steel, ■ in the precipitates was 0. Although it is observed at 2% or more, it decreases as the amount of Cr in the steel increases, and in 5% CrlijJ (comparative steel 7), V in the precipitates is about 0.04%. This means that 1% Crli
In J, a large amount of vanadium carbide precipitates, but 5%
In CrIil, vanadium carbide is difficult to precipitate, indicating that most of the vanadium is dissolved in the steel.
第２図には６００℃Ｘ１０”ｈのクリープ破断強さをＣ
ｒ量との関係で示すが、Ｃｒ量の増加と共にバナジウム
カーバイドが析出し難くなるため、クリープ破断強さが
低下しており、５％Ｃｒ鋼においてはバナジウムカーバ
イドが析出しにくいためクリープ破断強さへの寄与はあ
まり期待し得ない。Figure 2 shows the creep rupture strength at 600℃
As shown in relation to the amount of r, as the amount of Cr increases, it becomes difficult for vanadium carbide to precipitate, so the creep rupture strength decreases. cannot be expected to make much of a contribution.
第３図は、Ｎ以外が殆んど同レベル（０．１％Ｃ−０．
３％Ｓｉ−０．５％Ｍｎ−５％Ｃ ｒ − ０． ５％
Ｍｏ−０．０１％Ｎｉ−０．３０％■）の比較鋼７（０
．００２％Ｎ）、比較鋼８（０．０１０％Ｎ）、本発明
！ｉ４２１（０．０１６％Ｎ）および本発明鋼２ ２
（０．０ ２ ５％Ｎ） 、本発明１ｉ４２３（０．０
４０％Ｎ）、本発明１４２４（０．０４８％Ｎ）につい
て析出物中Ｖ景を鋼中Ｎｉｌとの関係で示したものであ
る。即ち０． ０ ０ ２％Ｎ鋼では析出物中にＶが０
．０４％しか認められないが、鋼中Ｎ量の増加と共に析
出物中Ｖ量が増加し、本発明でいうＮ量範囲では０．１
１〜０．２２％のＶが析出物中に認められる。このこと
は５％Ｃｒ＠においてはバナジウムナイトライドが多量
に析出することを示している。Figure 3 shows that everything except N is at almost the same level (0.1%C-0.
3%Si-0.5%Mn-5%Cr-0. 5%
Comparative steel 7 (0.01%Ni-0.30%)
．． 002%N), Comparative Steel 8 (0.010%N), Invention! i421 (0.016%N) and invention steel 2 2
(0.0 2 5%N), Invention 1i423 (0.0
40%N) and Invention 1424 (0.048%N) are shown in relation to Nil in the steel. That is, 0. 0 0 In 2%N steel, V is 0 in the precipitates.
．． Although only 0.4% is observed, the amount of V in the precipitates increases with the increase in the amount of N in the steel, and in the range of N amount referred to in the present invention, the amount of V in the precipitates increases.
1-0.22% V is found in the precipitate. This indicates that a large amount of vanadium nitride precipitates at 5% Cr@.
更に第４図には鋼中Ｎ量と６００℃Ｘ１０’ｈのクリー
プ破断強さの関係を示すが、本発明範囲内ではバナジウ
ムナイトライドの分散強化により１ １． ０ 〜１
２． ０ ｋｇｆ／ｍ ”の高いクリープ破断強さが得
られる．
「発明の効果」
以上説明したような本発明によるときはバナジウムナイ
トライドの分散強化により２！４Ｃｒ−ＩＭｏ鋼と同等
以上の優れたクリープ強さを示し、しかもこの２ ’Ａ
Ｃ ｒ − Ｉ Ｍ ｏ鋼で問題となる高温条件下で
の耐酸化性を有効に改善し、６００℃の高温長時間の使
用を可能ならしめた耐熱鋼を比較的低コストに提供し得
るものであって、工業的にその効果の大きい発明である
。Furthermore, Fig. 4 shows the relationship between the amount of N in the steel and the creep rupture strength at 600°C for 10'h. 0 ~ 1
2. A high creep rupture strength of 0 kgf/m'' can be obtained. ``Effects of the Invention'' As explained above, according to the present invention, due to the dispersion strengthening of vanadium nitride, excellent creep strength equivalent to or higher than that of 2!4Cr-IMo steel can be obtained. Showing strength and this 2'A
A heat-resistant steel that effectively improves the oxidation resistance under high-temperature conditions that is a problem with Cr-I Mo steel and can be used at high temperatures of 600°C for long periods at a relatively low cost. This invention is industrially highly effective.
図面は本発明の具体的実施態様を示すものであって、第
１図は０． １％Ｃ − ０． ３％Ｓｔ−０．５％Ｍ
ｎ−１〜５％Ｃ ｒ − ０． ５％Ｍｏ−０．０１％
Ｎｉ−０．３ ０％Ｖ−０．０ ０ ２％Ｎ＠について
の析出物中Ｖ量と鋼中Ｃｒｉｌの関係を示した図表、第
２図は同じ＜０．１％Ｇ − ０． ３％Ｓｔ−０．５
％Ｍｎ−１〜５％Ｃ ｒ − ０． ５％Ｍｏ−０．０
１％Ｎｉ−０．３０％Ｖ、−０．００２％Ｎｉｌについ
てのクリープ破断強さと鋼中Ｃｒ量の関係を示した図表
、第３図は０．１％Ｃ − ０． ３％Ｓｔ−０．５％
Ｍｎ−５％Ｃｒ−０． ５％Ｍｏ−０．０１％Ｎｉ−０
．３０％ｖ１０．０ ０ ２ 〜０．０ ４ ８％Ｎｌ
ｉ（７）析出物中Ｖ量と鋼中Ｎ量の関係を示した図表、
第４図は第３図の場合と同じ鋼についてのクリープ破断
強さと鋼中Ｎ量の関係を示した図表である。The drawings show specific embodiments of the present invention, and FIG. 1%C-0. 3%St-0.5%M
n-1 to 5%Cr-0. 5%Mo-0.01%
Figure 2 is a graph showing the relationship between the amount of V in precipitates and Crill in steel for Ni-0.3 0%V-0.0 0 2%N@. 3%St-0.5
%Mn-1~5%Cr-0. 5%Mo-0.0
Figure 3 shows the relationship between creep rupture strength and Cr content in steel for 1%Ni-0.30%V and -0.002%Nil. 3%St-0.5%
Mn-5%Cr-0. 5%Mo-0.01%Ni-0
．． 30%v10.0 0 2 ~0.0 4 8%Nl
i(7) A diagram showing the relationship between the amount of V in precipitates and the amount of N in steel,
FIG. 4 is a chart showing the relationship between the creep rupture strength and the amount of N in the steel for the same steel as in FIG. 3.
Claims (1)
％以下、Ｍｎ：０．１〜２．０ｗｔ％、Ｃｒ：４．０〜
６．０ｗｔ％、Ｍｏ：０．１〜１．５ｗｔ％、Ｎｉ：１
．０ｗｔ％以下、Ｖ：０．０５〜０．４０ｗｔ％、Ｎ：
０．０１５〜０．０５０ｗｔ％を含有し、残部がＦｅお
よび不純物からなることを特徴とする高温強度に優れた
５％Ｃｒ系耐熱鋼。 ２、Ｃ：０．０２〜０．１５ｗｔ％、Ｓｉ：１．５ｗｔ
％以下、Ｍｎ：０．１〜２．０ｗｔ％、Ｃｒ：４．０〜
６．０ｗｔ％、Ｍｏ：０．１〜１．５ｗｔ％、Ｎｉ：１
．０ｗｔ％以下、Ｖ：０．０５〜０．４０ｗｔ％、Ｎ：
０．０１５〜０．０５０ｗｔ％を含有すると共に、 Ｎｂ：０．０１〜０．１５ｗｔ％ を含有し、残部がＦｅおよび不純物からなることを特徴
とする高温強度に優れた５％Ｃｒ系耐熱鋼。[Claims] 1. C: 0.02 to 0.15 wt%, Si: 1.5 wt%
% or less, Mn: 0.1 to 2.0 wt%, Cr: 4.0 to
6.0wt%, Mo: 0.1-1.5wt%, Ni: 1
．． 0wt% or less, V: 0.05-0.40wt%, N:
A 5% Cr-based heat-resistant steel having excellent high-temperature strength, containing 0.015 to 0.050 wt%, with the remainder consisting of Fe and impurities. 2, C: 0.02-0.15wt%, Si: 1.5wt
% or less, Mn: 0.1 to 2.0 wt%, Cr: 4.0 to
6.0wt%, Mo: 0.1-1.5wt%, Ni: 1
．． 0wt% or less, V: 0.05-0.40wt%, N:
A 5% Cr-based heat-resistant steel with excellent high-temperature strength, characterized by containing 0.015 to 0.050 wt% of Nb, and 0.01 to 0.15 wt% of Nb, with the remainder consisting of Fe and impurities. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15464589A JPH0320440A (en) | 1989-06-19 | 1989-06-19 | 5% cr series heat-resistant steel having excellent high temperature strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15464589A JPH0320440A (en) | 1989-06-19 | 1989-06-19 | 5% cr series heat-resistant steel having excellent high temperature strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0320440A true JPH0320440A (en) | 1991-01-29 |
Family
ID=15588753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15464589A Pending JPH0320440A (en) | 1989-06-19 | 1989-06-19 | 5% cr series heat-resistant steel having excellent high temperature strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320440A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2398796A (en) * | 2003-02-27 | 2004-09-01 | Inst Francais Du Petrole | Steel containing Cr, Mn, Si and Mo |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55110758A (en) * | 1979-02-20 | 1980-08-26 | Sumitomo Metal Ind Ltd | High temperature use chromium steel |
-
1989
- 1989-06-19 JP JP15464589A patent/JPH0320440A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55110758A (en) * | 1979-02-20 | 1980-08-26 | Sumitomo Metal Ind Ltd | High temperature use chromium steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2398796A (en) * | 2003-02-27 | 2004-09-01 | Inst Francais Du Petrole | Steel containing Cr, Mn, Si and Mo |
| GB2398796B (en) * | 2003-02-27 | 2006-05-17 | Inst Francais Du Petrole | Use of low alloy anticoking steels with an increased silicon and manganese content in refining and petrochemicals applications,and novel steel compositions |
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