JPH04191326A - Method for heat treating steel tube - Google Patents
Method for heat treating steel tubeInfo
- Publication number
- JPH04191326A JPH04191326A JP32385790A JP32385790A JPH04191326A JP H04191326 A JPH04191326 A JP H04191326A JP 32385790 A JP32385790 A JP 32385790A JP 32385790 A JP32385790 A JP 32385790A JP H04191326 A JPH04191326 A JP H04191326A
- Authority
- JP
- Japan
- Prior art keywords
- steel tube
- treatment
- heat
- strength
- hardening treatment
- 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 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000006698 induction Effects 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 25
- 230000000171 quenching effect Effects 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 14
- 230000007704 transition Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、鋼管の熱処理方法、詳しくは、高強度、高靭
性の鋼管を得るべく、肉厚１４ｆ１以上の主として継目
無鋼管の熱処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of heat treating steel pipes, and more particularly, to a method of heat treating mainly seamless steel pipes having a wall thickness of 14 f1 or more in order to obtain steel pipes with high strength and high toughness. It is something.
「従来の技術」
従来、例えば降伏応力が４２ｋｇｆ／ｍ’以上の高強度
を要求されるライン用鋼管の場合、良好な溶接性を保持
しながら必要強度を得るためには、制御圧延法、ＴＭＣ
Ｐ法、調質熱処理法等により製造せざるを得なく、特に
継目無鋼管の場合は、製造設備の制約から調質熱処理法
により製造せざるを得ない。"Prior Art" Conventionally, in the case of line steel pipes that require high strength, for example, yield stress of 42 kgf/m' or more, in order to obtain the necessary strength while maintaining good weldability, controlled rolling methods, TMC
There is no choice but to manufacture it by the P method, tempering heat treatment method, etc. In particular, in the case of seamless steel pipes, it is inevitable to manufacture by the tempering heat treatment method due to constraints on manufacturing equipment.
前記調質熱処理法のうちの焼入れ処理の手段には、大別
して炉加熱焼入れ処理法と、誘導加熱焼入れ処理法との
二種がある。Among the tempering heat treatment methods, there are two types of hardening treatment methods: a furnace heating hardening treatment method and an induction heating hardening treatment method.
「発明が解決しようとする課題」
ところで、前記炉加熱焼入れ処理法では、製品の肉厚が
厚いものでも十分な焼入れ効果が得られるが、加熱時間
が長くなるために、製品の破面遷移温度特性はあまり良
くない。``Problem to be Solved by the Invention'' By the way, with the above-mentioned furnace heating quenching treatment method, a sufficient quenching effect can be obtained even for thick products, but since the heating time is long, the fracture surface transition temperature of the product The characteristics are not very good.
例えば肉厚が１４鶴、降伏応力が４８ｋｇｆ／ｍ”の鋼
では、薄型試験の延性破面率が８５％のときの遷移温度
は０℃前後である。For example, for steel with a wall thickness of 14 mm and a yield stress of 48 kgf/m'', the transition temperature is around 0° C. when the ductile fracture ratio in the thin test is 85%.
また前記誘導加熱焼入れ処理法では、加熱時間が短かい
ので、製品の破面遷移温度特性が良くなる。Furthermore, in the induction heating quenching treatment method, since the heating time is short, the fracture surface transition temperature characteristics of the product are improved.
例えば肉厚が１４籠、降伏応力が４８ｋｇｆ／ｍ’の鋼
では、薄型試験の延性破面率が８５％のときの遷移温度
は一４０℃前後である。For example, in a steel having a wall thickness of 14 mm and a yield stress of 48 kgf/m', the transition temperature is around -40°C when the ductile fracture ratio in the thin test is 85%.
しかしながら、誘導加熱焼入れ処理法にあっては、肉厚
がほぼ１５ｍを超える場合には、加熱効果が厚みの内部
方向に及ばず、十分な焼入れ効果が得られないので、高
強度製品が得られない。However, with the induction heating quenching treatment method, if the wall thickness exceeds approximately 15 m, the heating effect does not extend to the inside of the thickness, and a sufficient quenching effect cannot be obtained, making it difficult to obtain a high-strength product. do not have.
調質鋼の破面遷移温度特性を高めるには、Ｎ１を添加す
ることが有効であり、１％を超える添加量の範囲から効
果が要著になってくるが、耐５ｏｕｒ用途の場合には、
Ｎｉの添加量が制限され、−船釣に１％以上添加するこ
とができなくなる。Adding N1 is effective in increasing the fracture surface transition temperature characteristics of tempered steel, and the effect becomes significant from an addition amount exceeding 1%, but in the case of 5our resistant applications, ,
The amount of Ni added is limited, and - it is no longer possible to add more than 1% to boat fishing.
「課題を解決するための手段」
本発明は、鋼管に対する前記従来の熱処理方法の５１１
題を解決すべくなしたものであって、その要旨とすると
ころは、未熱処理鋼管に対して、炉加熱焼入れ処理を行
い、次いで誘導加熱焼入れ処理を行った後、焼戻し処理
を行うことにある。"Means for Solving the Problems" The present invention provides 511 points of the conventional heat treatment method for steel pipes.
This was done to solve the problem, and its gist is to perform furnace heating quenching treatment on unheated steel pipes, then induction heating quenching treatment, and then tempering treatment. .
「作用ｊ
前記の如く、未熱処理鋼管に対して、炉加熱焼入れ処理
を行うことにより、必要な強度を付与することができる
。Effect j As mentioned above, necessary strength can be imparted to an unheat-treated steel pipe by subjecting it to furnace heating and quenching treatment.
次いで誘導加熱焼入れ処理を行うことにより、破面遷移
温度特性を向上させることができ、強度、靭性共乙こ優
れた馬’ａｍ管が得らねる。By subsequently performing an induction heating quenching treatment, the fracture surface transition temperature characteristics can be improved, and a tube with superior strength and toughness can be obtained.
［実施例３
外径が４０６．４ ｆｌ、肉厚が１８ｗの未跣処理の継
し］無鋼管（Ｃ；０．０６％、Ｓｉ：０．２６％、Ｍｎ
＋１．４６％、Ｐ：０．０１０％、Ｓ；０．００４ ％
、Ａｌ；０．０２４％、ν；０．０４１ ％、Ｃｕ；０
．１７％、Ｎｉ；０．２５％）に対して、下記の熱処理
を行った。[Example 3 Unfinished joint with outer diameter of 406.4 fl and wall thickness of 18W] Steel-free pipe (C: 0.06%, Si: 0.26%, Mn
+1.46%, P: 0.010%, S; 0.004%
, Al; 0.024%, ν; 0.041%, Cu; 0
．． 17%, Ni; 0.25%) was subjected to the following heat treatment.
炉加熱焼入れ処理 ：９９０℃×５分−・水冷誘導加熱
焼入れ処理：９３０℃〜−−−−−−−水冷焼
熟戻し処理 ：６６０℃×ｌＯ分また比較例とし
て、同寸法、同成分の継目無鋼管に対して、下記の熱処
理を行った。Furnace heating quenching treatment: 990°C x 5 minutes - Water cooling induction heating quenching treatment: 930°C - Water cooling tempering treatment: 660°C x 10 minutes Also, as a comparative example, The seamless steel pipe was subjected to the following heat treatment.
炉加熱焼入れ処理：９９０℃×５分−水冷焼
キ戻し処理 ：６６０℃×１０分
第１図は、本発明実施例鋼管と比較例網管との薄型試験
結果のグラフであり、本発明実施例鋼管の方が比較例鋼
管よりも、破面遷移温度特性が著しく優れている。Furnace heating and quenching treatment: 990°C x 5 minutes - Water cooling tempering treatment: 660°C x 10 minutes FIG. The steel pipe has significantly better fracture surface transition temperature characteristics than the comparative steel pipe.
「発明の効果］
以上述べた本発明の如（、未熱処理鋼管に対して、炉加
熱焼入れ処理を行うことにより、必要な強度を付与する
ことができる。"Effects of the Invention" According to the present invention described above, necessary strength can be imparted to an unheat-treated steel pipe by subjecting it to furnace heating and quenching treatment.
次いで誘導加熱焼入れ処理を行うことにより、破面遷移
温度特性を向上させることができ、強度、靭性共に優れ
た調質鋼管が得られる。Next, by performing induction heating quenching treatment, the fracture surface transition temperature characteristics can be improved, and a tempered steel pipe with excellent strength and toughness can be obtained.
第１図は本発明実施例鋼管と比較例鋼管との薄型試験結
果のグラフである。FIG. 1 is a graph of the results of a thin-profile test of steel pipes of examples of the present invention and steel pipes of comparative examples.
Claims (1)
、次いで誘導加熱焼入れ処理を行った後、焼戻し処理を
行うことを特徴とする鋼管の熱処理方法。(1) A method for heat treating a steel pipe, which comprises performing a furnace heating quenching treatment on an unheated steel pipe, followed by an induction heating quenching treatment, and then a tempering treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32385790A JPH04191326A (en) | 1990-11-26 | 1990-11-26 | Method for heat treating steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32385790A JPH04191326A (en) | 1990-11-26 | 1990-11-26 | Method for heat treating steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04191326A true JPH04191326A (en) | 1992-07-09 |
Family
ID=18159362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32385790A Pending JPH04191326A (en) | 1990-11-26 | 1990-11-26 | Method for heat treating steel tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04191326A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011021396A1 (en) * | 2009-08-21 | 2011-02-24 | 住友金属工業株式会社 | Method for manufacturing thick-walled seamless steel pipe |
-
1990
- 1990-11-26 JP JP32385790A patent/JPH04191326A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011021396A1 (en) * | 2009-08-21 | 2011-02-24 | 住友金属工業株式会社 | Method for manufacturing thick-walled seamless steel pipe |
| JP4748283B2 (en) * | 2009-08-21 | 2011-08-17 | 住友金属工業株式会社 | Manufacturing method of thick-walled seamless steel pipe |
| CN102482727A (en) * | 2009-08-21 | 2012-05-30 | 住友金属工业株式会社 | Method for manufacturing thick-walled seamless steel pipe |
| US8845830B2 (en) | 2009-08-21 | 2014-09-30 | Nippon Steel & Sumitomo Metal Corporation | Method of manufacturing heavy-wall seamless steel pipe |
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