JPH02270914A - Efficient manufacture of tough hardening steel - Google Patents
Efficient manufacture of tough hardening steelInfo
- Publication number
- JPH02270914A JPH02270914A JP1089983A JP8998389A JPH02270914A JP H02270914 A JPH02270914 A JP H02270914A JP 1089983 A JP1089983 A JP 1089983A JP 8998389 A JP8998389 A JP 8998389A JP H02270914 A JPH02270914 A JP H02270914A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- temperature
- less
- cooling rate
- furnace
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 229910001566 austenite Inorganic materials 0.000 abstract description 8
- 238000007670 refining Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、オーステナイトをｗ＃ｌ化する過程を必要と
することなく、強靭鋼を１！６能率に製造する方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing strong steel at a efficiency of 1:6 without requiring a process of converting austenite into W#l.
（従来の＆術）
６０〜８０キロＨＴや低温用鋼は１１通常、焼入れ焼戻
しプロセスによって製造される。このプロセスにおいて
は、オーステナイト組織を可及的に微細化するためにＡ
ｅ＋点直上の温度に加熱して焼入れを行っていた。二の
ようなプロセスは、たとえば特公昭４６−３８５１号公
報、特公昭４７−７９８１号公報、特公昭５３〜２３２
４１号公報および特公昭５６−２０３３５号公報等に開
示されている。これらはいずれもオーステナイトの粗大
化を狙ったものではなく、また焼戻しも高温の炉に材料
を装入し、短時間に行うものではない。(Conventional & Technique) 60-80 kg HT and low temperature steels are usually produced by a quenching and tempering process. In this process, A
Hardening was performed by heating to a temperature just above the e+ point. Processes like 2 are described, for example, in Japanese Patent Publication No. 46-3851, Japanese Patent Publication No. 7981-1977, and Japanese Patent Publication No. 53-232.
This method is disclosed in Japanese Patent Publication No. 41 and Japanese Patent Publication No. 56-20335. None of these methods aim at coarsening austenite, and tempering is not performed in a short period of time by charging the material into a high-temperature furnace.
（発明が解決しようとする課題）
本発明は、焼入れ焼戻しによって鋼を製造するに際し、
敢えてオーステナイトを微細化する必要はなく、また焼
戻し過程において、目的とする焼戻し温度よりもはるか
に高い温度に保たれた炉に材料を装入し、短時間に能率
良く焼戻し処理を行うことができる強靭鋼の製造方法を
提供する。(Problems to be Solved by the Invention) The present invention provides the following problems when manufacturing steel by quenching and tempering:
There is no need to intentionally refine the austenite, and during the tempering process, the material can be charged into a furnace maintained at a much higher temperature than the desired tempering temperature, allowing the tempering process to be performed efficiently in a short time. Provides a method for manufacturing strong steel.
（課題を解決するための手段） 本発明は、重量で、 Ｃ：０．０３〜０．２％、 Ｓ ｉ ：０．０３〜０．５％、 Ｍｎ ：０．３〜１．８％、 さらに Ｃｕ５ＮｉＳＣｒ、Ｍ。(Means for solving problems) The present invention, by weight, C: 0.03-0.2%, Si: 0.03-0.5%, Mn: 0.3-1.8%, Furthermore, Cu5NiSCr, M.
二合計量で０．３％、８１２．７％以下、Ｂ ：０．
０００３〜０．００３％
を含有し、残部Ｆｅおよび不可避的不純物からなる鋼を
、９００℃以上で圧延を終了するよう熱間圧延し、冷却
速度（℃／ｓ）＞ ２３〜０．２５Ｘ板厚（ｍｍ一）を
満足する冷却速度で４００℃以下の温度まで水冷し、次
いで８５０℃以上の温度に保たれた炉に装入し、鋼の表
面温度が４００℃以上７００℃以下の温度になった時点
で炉から抽出する焼戻し処理を行うことを特徴とする強
靭鋼の高能率製造方法である。Total amount of both is 0.3%, 812.7% or less, B: 0.
0003 to 0.003%, with the balance consisting of Fe and unavoidable impurities, hot rolled to finish rolling at 900°C or higher, cooling rate (°C/s) > 23 to 0.25X sheet thickness The steel is water-cooled to a temperature of 400°C or less at a cooling rate that satisfies the temperature of This is a highly efficient manufacturing method for strong steel, which is characterized by performing a tempering process by extracting the steel from the furnace at the point where the steel is extracted from the furnace.
（作用）
本発明にあっては、所定の成分の鋼を鋳造まま直ちにま
たは温度調整のための加熱後もしくは一旦冷片となった
ものを再加熱後圧延し、９００℃以上の尚温で圧延を終
了する。これにより、オーステナイトが過度に微細化さ
れず、焼入れ性が劣化することなく焼入れされる。(Function) In the present invention, steel with a predetermined composition is rolled immediately as cast, or after heating for temperature adjustment, or after reheating once it has become a cold piece, and then rolled at a still temperature of 900°C or higher. end. As a result, the austenite is not excessively refined and is hardened without deteriorating the hardenability.
また、焼戻しも、従来技術にあっては目的とする温度に
保たれた炉の中に鋼を装入し、極めて長時間をかけて昇
温し、さらにその温度に３０分〜１時間保定することに
よ！）行っていたが、本発明においては、極めて短時間
のうちに目的の温度に加熱し、さらにその温度に保持す
ることなく直ちに炉から抽出することによって、微細な
焼入れ焼戻し組織を得るとともに、セメンタイトの凝集
、析出物の粗大化を防ぎ、優れたｍ械的性質を有する鋼
を得る。Furthermore, in the conventional technology for tempering, steel is charged into a furnace maintained at a target temperature, heated over an extremely long period of time, and then maintained at that temperature for 30 minutes to 1 hour. Especially! ), but in the present invention, by heating to the target temperature in an extremely short time and immediately extracting it from the furnace without holding it at that temperature, a fine quenched and tempered structure is obtained, and cementite is This prevents agglomeration and coarsening of precipitates, resulting in a steel with excellent mechanical properties.
Ｃは鋼の焼入れ性および強度を＾めるために添加する。C is added to improve the hardenability and strength of steel.
０．０３％未満では効果が十分に発揮されない、また
０、２％超では靭性お上り溶接性を劣化させる。If it is less than 0.03%, the effect will not be fully exhibited, and if it exceeds 0.2%, the toughness and weldability will deteriorate.
Ｓｉ はＣと同様の効果をもたらすが、Ｃより効果が小
さく、そのために下限を０．０３％に、上限を０．５％
にした。Si has the same effect as C, but is less effective than C, so the lower limit is set to 0.03% and the upper limit is set to 0.5%.
I made it.
Ｍｎ もＣと同様に鋼の焼入れ性および強度を＾める効
果があるが、Ｃとは異なりその量を増しても靭性をあま
り劣化させない。そのため０．３〜１．８％添加する。Like C, Mn also has the effect of increasing the hardenability and strength of steel, but unlike C, increasing its amount does not significantly degrade toughness. Therefore, it is added in an amount of 0.3 to 1.8%.
そのほかＣｕ、 Ｎｉ、 Ｃｒ％Ｍｏを添加するが、い
ずれも鋼の靭性を損なわず、地鉄の強化、焼入れ性の増
大に効果がある。これらの元素は合計量で下限を０．３
％超、上限を２．７％にした。０．３％以下では効果が
小さく、２．７％超では溶接性および靭性が劣化する。In addition, Cu, Ni, and Cr%Mo are added, but none of them impair the toughness of the steel and are effective in strengthening the base steel and increasing its hardenability. The total amount of these elements has a lower limit of 0.3
%, the upper limit was set at 2.7%. If it is less than 0.3%, the effect will be small, and if it exceeds 2.7%, weldability and toughness will deteriorate.
Ｂは鋼の焼入れ性を＾めるために添加し、微量で効果が
あるが、０．０００３％未満では効果がなく、ｏ、ｏｏ
ａ％超では靭性を劣化させる。B is added to improve the hardenability of steel, and is effective in small amounts, but it has no effect if it is less than 0.0003%, and o, oo
If it exceeds a%, the toughness deteriorates.
■、Ｎｂ、Ｔｉは微量で析出硬化作用を持ち、強度を＾
めるために必要に応じ添加するが、それぞれ０．１％以
下、合計で０．２％以下の量で添加してもかまわない、
Ｎは特に限定しないが、０．００５％以ドが望ましい。■, Nb, and Ti have a precipitation hardening effect in small amounts and increase strength^
They may be added as necessary to improve the performance, but they may be added in an amount of 0.1% or less for each, and 0.2% or less in total.
Although N is not particularly limited, it is preferably 0.005% or more.
上記成分の鋼を鋳造復圧延を行うが、直接圧延、再加熱
圧延のいずれでもかまわない。圧延によりオーステナイ
トが細粒化して焼入れ性を劣化させるのを防ぐため、９
００ ’Ｃ以上で圧延を終了しなければならない。Steel having the above components is cast and back-rolled, but either direct rolling or reheat rolling may be used. In order to prevent austenite from becoming fine grained due to rolling and deteriorating hardenability, 9.
Rolling must be completed at 00'C or higher.
さらに、圧延の終了後水冷により焼入れを行うが、冷却
速度が遅いと焼きが入らない、冷却速度は板厚によって
異なるために、冷却速度（”Ｃ／ｓ）＞２３〜０．２５
Ｘ板厚（ｍｍ）を満足しなければならない。Furthermore, after the rolling is completed, hardening is performed by water cooling, but if the cooling rate is slow, hardening will not occur.Since the cooling rate varies depending on the plate thickness, the cooling rate ("C/s) > 23 to 0.25
Must satisfy X plate thickness (mm).
また、冷却の終了温度は４００℃以トでないと焼入れ組
織が得られない。Further, a hardened structure cannot be obtained unless the cooling end temperature is 400° C. or lower.
焼戻しは通常の方法とは異なり急速に焼戻しを行うため
、目的とする焼戻し温度（通常６００〜６５０℃）より
＾い８５０℃以上に予め加熱された炉中に挿入する。８
５０℃未満では急速加熱が不十分で、効果が少ない、４
００℃以上７００℃以下の焼戻し温度になった時点で炉
から抽出する。Unlike normal methods, tempering is performed rapidly, so the material is inserted into a furnace preheated to 850°C or higher, which is higher than the desired tempering temperature (usually 600 to 650°C). 8
If it is less than 50℃, rapid heating is insufficient and the effect is low.4
When the tempering temperature reaches 00°C or more and 700°C or less, the material is extracted from the furnace.
この温度で保定を行うとセメンタイトが凝集し、その他
の析出物も粗大化するので、保定は行わない。If retention is performed at this temperature, cementite will aggregate and other precipitates will also become coarse, so retention is not performed.
（実施例）
表１に鋼の化学成分、表２に製造条件と材質を示す、Ｈ
，Ｓの符号を付けたものは比較例で、Ｈの符号が付いた
ものは鋼の化学成分は要件を満たすが、他の製造条件が
要件を満たさないものであり、Ｓの符号が付いたものは
鋼の化学成分が要件を満たさないものである。これより
、本発明の有効性が明らかである。(Example) Table 1 shows the chemical composition of steel, Table 2 shows the manufacturing conditions and material, H
, Those marked with S are comparative examples, and those marked with H meet the requirements for the chemical composition of the steel, but other manufacturing conditions do not meet the requirements, and are marked with S. The chemical composition of the steel does not meet the requirements. From this, the effectiveness of the present invention is clear.
（発明の効果）
本発明により、粗大なオーステナイトからでも微細な焼
入れ焼戻し組織が得られ、優れた靭性を有する商張力鋼
が高能率で得られる。(Effects of the Invention) According to the present invention, a fine quenched and tempered structure can be obtained even from coarse austenite, and a commercial tension steel having excellent toughness can be obtained with high efficiency.
Claims (1)
．７％以下、 Ｂ：０．０００３〜０．００３％ を含有し、残部Ｆｅおよび不可避的不純物からなる鋼を
、９００℃以上で圧延を終了するよう熱間圧延し、冷却
速度（℃／ｓ）＞２３−０．２５×板厚（ｍｍ）を満足
する冷却速度で４００℃以下の温度まで水冷し、次いで
８５０℃以上の温度に保たれた炉に装入し、鋼の表面温
度が４００℃以上７００℃以ドの温度になった時点で炉
から抽出する焼戻し処理を行うことを特徴とする強靭鋼
の高能率製造方法。(1) By weight, C: 0.03-0.2%, Si: 0.03-0.5%, Mn: 0.3-1.8%, and Cu, Ni, Cr, Mo: total amount over 0.3%2
．． A steel containing 7% or less, B: 0.0003 to 0.003%, and the balance consisting of Fe and inevitable impurities is hot rolled to finish rolling at 900°C or higher, and the cooling rate (°C/s) is > 23-0.25 × plate thickness (mm) Water cooled to a temperature of 400℃ or less at a cooling rate, then charged into a furnace maintained at a temperature of 850℃ or higher, so that the surface temperature of the steel was 400℃ A highly efficient manufacturing method for strong steel, characterized in that a tempering treatment is performed by extracting the steel from a furnace when the temperature reaches 700° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1089983A JP2780104B2 (en) | 1989-04-10 | 1989-04-10 | High-efficiency production method of tough steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1089983A JP2780104B2 (en) | 1989-04-10 | 1989-04-10 | High-efficiency production method of tough steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02270914A true JPH02270914A (en) | 1990-11-06 |
| JP2780104B2 JP2780104B2 (en) | 1998-07-30 |
Family
ID=13985895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1089983A Expired - Lifetime JP2780104B2 (en) | 1989-04-10 | 1989-04-10 | High-efficiency production method of tough steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2780104B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05255743A (en) * | 1992-03-09 | 1993-10-05 | Nippon Steel Corp | Production of high tensile strength steel plate by rapid tempering |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5896817A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of high tensile hot rolled steel material having high toughness |
| JPS58104120A (en) * | 1981-12-17 | 1983-06-21 | Kawasaki Steel Corp | Manufacture of high tensile steel material having fine grain structure |
| JPS6148517A (en) * | 1984-08-10 | 1986-03-10 | Nippon Kokan Kk <Nkk> | Manufacture of high tension steel having >=60kg/mm2 tensile strength |
| JPS61163210A (en) * | 1985-01-09 | 1986-07-23 | Nippon Steel Corp | Production of boron-containing low-alloy steel having excellent strength and toughness |
-
1989
- 1989-04-10 JP JP1089983A patent/JP2780104B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5896817A (en) * | 1981-12-07 | 1983-06-09 | Sumitomo Metal Ind Ltd | Production of high tensile hot rolled steel material having high toughness |
| JPS58104120A (en) * | 1981-12-17 | 1983-06-21 | Kawasaki Steel Corp | Manufacture of high tensile steel material having fine grain structure |
| JPS6148517A (en) * | 1984-08-10 | 1986-03-10 | Nippon Kokan Kk <Nkk> | Manufacture of high tension steel having >=60kg/mm2 tensile strength |
| JPS61163210A (en) * | 1985-01-09 | 1986-07-23 | Nippon Steel Corp | Production of boron-containing low-alloy steel having excellent strength and toughness |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05255743A (en) * | 1992-03-09 | 1993-10-05 | Nippon Steel Corp | Production of high tensile strength steel plate by rapid tempering |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2780104B2 (en) | 1998-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5879364B2 (en) | Steel sheet for molded member having excellent ductility, molded member, and manufacturing method thereof | |
| JP4018905B2 (en) | Hot rolled wire rod and bar for machine structure and manufacturing method thereof | |
| CN108950150A (en) | Manganese Q&P steel heat treatment process in superhigh intensity cold rolling based on complete austenitizing | |
| JPH0320408A (en) | Production of high tensile steel stock excellent in toughness at low temperature | |
| JP2828303B2 (en) | Manufacturing method of tough steel plate | |
| JPH02270914A (en) | Efficient manufacture of tough hardening steel | |
| JPH0257634A (en) | Manufacture of high-strength steel plate and heat treatment for worked product of same | |
| JPH0813028A (en) | Production of precipitation hardening steel material having high tensile strength and high toughness | |
| JP2581267B2 (en) | Method for producing high strength, high ductility 13Cr stainless steel | |
| JP6610067B2 (en) | Cold rolled steel sheet manufacturing method and cold rolled steel sheet | |
| JP3848397B2 (en) | Manufacturing method of high-efficiency and highly uniform tough steel plate | |
| JP2767254B2 (en) | Method for producing Cr-Mo case hardened steel | |
| JPS6156268A (en) | High toughness and high tensile steel and its manufacture | |
| JPS6383225A (en) | Manufacture of high hardness steel sheet | |
| KR100256330B1 (en) | The manufacturing method for tensile strength 120kgf/mm2 high strength steel | |
| US20240052467A1 (en) | High-strength wire rod for cold heading with superior heat treatment characteristics and resistance of hydrogen-delayed fracture characteristics, heat-treated component, and method for manufacturing same | |
| JPH026828B2 (en) | ||
| JPH02267219A (en) | Production of steel plate excellent in carburizability | |
| JPH0573808B2 (en) | ||
| KR950003547B1 (en) | Making method of low temperature ni-steel | |
| JP2020029620A (en) | Manufacturing method of cold rolled steel sheet and cold rolled steel sheet | |
| KR100256332B1 (en) | The manufacturing method for yield strength 220ksi super high strength steel | |
| JPH07242940A (en) | Production of low yield ratio high tensile strength steel by rapid tempering | |
| JPH05230530A (en) | Production of high tensile strength steel plate | |
| KR101449128B1 (en) | High carbon steel sheet having excellent uniformity and workability and method for manufacturing thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080515 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090515 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |