JPS61261431A - Manufacture of high strength and toughness steel having high yield strength ratio - Google Patents
Manufacture of high strength and toughness steel having high yield strength ratioInfo
- Publication number
- JPS61261431A JPS61261431A JP60103263A JP10326385A JPS61261431A JP S61261431 A JPS61261431 A JP S61261431A JP 60103263 A JP60103263 A JP 60103263A JP 10326385 A JP10326385 A JP 10326385A JP S61261431 A JPS61261431 A JP S61261431A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- strength
- manufacture
- toughness
- yield 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
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野〕
本発明は耐力比の高い高強度高靭性鋼の製造方法に関し
、さらに詳しくは、条鋼或いは非調質棒鋼等に適した耐
力比の高い高強度高靭性鋼の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing high-strength, high-toughness steel with a high yield strength ratio, and more specifically, a method for manufacturing high-strength, high-toughness steel with a high yield strength ratio, which is suitable for long steel bars, non-tempered steel bars, etc. This invention relates to a method for manufacturing high-strength, high-toughness steel.
[従来技術1
一般的に、非調質棒鋼においてはV、Nb等を含有させ
ることによって強度および靭性を向上させ、かつ、確保
しており、また、鋼の耐力を上昇させるには、ストレッ
チング、引抜外、熱処理等を行なっているが、これらの
処理は一連の製造工程から外れた所で行なわれている。[Prior art 1] In general, non-tempered steel bars contain V, Nb, etc. to improve and ensure strength and toughness, and to increase the yield strength of steel, stretching is , drawing, heat treatment, etc. are performed, but these treatments are performed outside the series of manufacturing steps.
また、従来における非調質鋼は耐力が低く、高耐力を必
要とする、例えば、PCC鋼棒−は高力ボルト等の用途
には使用することができない。Furthermore, conventional non-tempered steels have low yield strength, and PCC steel bars, which require high yield strength, for example, cannot be used for applications such as high-strength bolts.
[発明が解決しようとする問題点]
本発明は上記に説明したように従来における棒鋼または
非調質鋼は耐力が低く、かつ、耐力を向上させる方法が
一貫性のないことに鑑み、本発明者が鋭意研究を行なっ
た結果、含有成分によらず、また、従来の棒鋼の製造設
備を利用するだけで、耐力比が高(、かつ、高強度高靭
性を有し、例えば、PC鋼棒や高力ボルトに適した鋼を
一連の工程において製造する方法を開発したのである。[Problems to be Solved by the Invention] As explained above, the present invention has been developed in view of the fact that conventional steel bars or non-tempered steels have low yield strength, and methods for improving yield strength are inconsistent. As a result of intensive research conducted by researchers, it has been found that regardless of the content, and by simply using conventional steel bar manufacturing equipment, it is possible to produce a PC steel bar with a high yield strength ratio (and high strength and high toughness), such as a PC steel bar. They developed a method to manufacture steel suitable for high-strength bolts and high-strength bolts through a series of processes.
[問題点を解決するための手段]
本発明に係る耐力比の高い高強度高靭性鋼の製造方法の
特徴とするところは、
CQ、3011t%以上を含有する鋼を加熱し、熱間圧
延後1〜10秒間の強制冷却を行ない、過冷組織生成前
に強制冷却を中止して放冷し、次に、ストレッチ量0.
5〜5%の仕上圧延を行なうことにある。[Means for Solving the Problems] The method for producing high-strength, high-toughness steel with a high proof stress ratio according to the present invention is characterized by: heating steel containing 3011 t% or more of CQ, and after hot rolling. Forced cooling is performed for 1 to 10 seconds, and the forced cooling is stopped before supercooled tissue formation and allowed to cool. Next, the amount of stretching is 0.
The purpose is to perform finish rolling of 5 to 5%.
本発明に係る耐力比の高い高強度高靭性鋼の製造方法に
ついて以下詳細に説明する。The method for producing high-strength, high-toughness steel with a high proof stress ratio according to the present invention will be described in detail below.
先ず、本発明に係る耐力比の高い高強度高靭性鋼の製造
方法における構成要件について説明する。First, the structural requirements of the method for producing high-strength, high-toughness steel with a high proof stress ratio according to the present invention will be explained.
Cはフェライトパーライト組織として高強度を得るため
に必要であり、含有量が0.30wt%未満ではこのよ
うな効果は期待できない。よって、C含有量は0.30
wt%以上とする。C is necessary to obtain high strength as a ferrite pearlite structure, and such an effect cannot be expected if the content is less than 0.30 wt%. Therefore, the C content is 0.30
wt% or more.
熱間圧延後強制冷却を、水冷により1〜10秒間行なう
のは、1秒未満の時間では内部保有熱により再オーステ
ナイト化して後工程で行なうストレッチの効果がなく、
また、10秒を越える時間では表層の適冷を防止するこ
とが困難であり、さらに、鋼が適冷組織となる前に強制
冷却を中止し°て放冷することに上り、均一なフェライ
トパーライトmmとするのである。Forced cooling after hot rolling is performed by water cooling for 1 to 10 seconds, because if the time is less than 1 second, the internal heat will re-austenite and the stretching performed in the subsequent process will not be effective.
In addition, if the time exceeds 10 seconds, it is difficult to prevent the surface layer from cooling properly, and furthermore, forced cooling must be stopped and allowed to cool before the steel has a suitable cooling structure, resulting in uniform ferrite pearlite formation. It is set as mm.
このように、均一なフェライトパーライト組織とした鋼
に対して、0.5〜5%のストレッチ量で仕上圧延を行
なうのであるが、ストレッチ量が0.5%未満では耐力
の向上が不足し、また、5%を越えるストレッチ量では
耐力向上効果が飽和し、がっ、鋼材の径の細りが大とな
ってしまう。As described above, finish rolling is performed on steel with a uniform ferrite-pearlite structure with a stretching amount of 0.5 to 5%, but if the stretching amount is less than 0.5%, the yield strength will not be improved enough, Furthermore, if the amount of stretch exceeds 5%, the yield strength improvement effect is saturated, and the diameter of the steel material becomes narrower.
[実施例1
本発明に係る耐力比の高い高強度高靭性鋼の製造方法に
ついて実施例を説明する。[Example 1] An example will be described regarding the method for producing high-strength, high-toughness steel with a high proof stress ratio according to the present invention.
実施例
(1)供試材
CO,60wt%、Si 0024wt%、Mn 1,
36wt%、Cr O,98wL%、残部Feおよび不
純物(2)圧延条件
通常加熱 (980℃)
↓
圧延 (粗列、中間列)32φ
1 圧延終了温度 920″C
↓
強制冷却 (中間水冷)2.4秒冷却
1 表面温度 390℃(Ms点266℃)↓
仕上圧延機(4台)によるストレッチ
復熱後表面温度 520℃
ストレッチ量 0%、0.5%、1.0%、2.1%、
5.4%
このようにして製作された試験片の組織は、少量のフェ
ライトパーライト組織であった。Example (1) Sample material CO, 60wt%, Si 0024wt%, Mn 1,
36wt%, CrO, 98wL%, balance Fe and impurities (2) Rolling conditions Normal heating (980℃) ↓ Rolling (rough row, middle row) 32φ 1 Rolling end temperature 920″C ↓ Forced cooling (intermediate water cooling) 2. 4 seconds cooling 1 Surface temperature 390°C (Ms point 266°C) ↓ Surface temperature after stretch recuperation by finishing rolling mills (4 units) 520°C Stretch amount 0%, 0.5%, 1.0%, 2.1% ,
5.4% The structure of the test piece thus produced was a small amount of ferrite pearlite structure.
この試験片により各機械的性質およびストレッチによる
寸法減量を第1表に示す。Table 1 shows the mechanical properties and dimensional loss due to stretching of this test piece.
なお、上記供試材を12秒間の強制冷却を行なった場合
には、表面温度は80°C、マルテンサイト組織であり
、復熱後表面温度は180℃であった。In addition, when the above-mentioned sample material was forcedly cooled for 12 seconds, the surface temperature was 80°C, a martensitic structure, and the surface temperature after reheating was 180°C.
本発明に係る耐力比の高い高強度高靭性鋼の製造方法に
より得られた鋼は、圧延虫まで耐力比が高(、高靭性で
あり、また、その悟熱処理することなく J IS G
3109 PC鋼棒B種やJISB1051 10.
9ボルトに使用できる。The steel obtained by the method for manufacturing high-strength, high-toughness steel with a high proof stress ratio according to the present invention has a high proof stress ratio (and high toughness) even when rolled, and can be JIS G grade without being subjected to heat treatment.
3109 PC steel bar type B or JISB1051 10.
Can be used for 9 volts.
[発明の効果1
以上説明したように、本発明に係る耐力比の高い高強度
高靭性鋼の製造方法は上記の構成を有しているものであ
るから、条鋼、非調質鋼を、例えば、PC鋼棒や高力ボ
ルト等の製造に適するような耐力比とし、高強度および
高靭性とすることができるという優れた効果を有するも
のである。[Effect of the invention 1 As explained above, the method for manufacturing high strength, high toughness steel with a high proof stress ratio according to the present invention has the above configuration, so that the long steel, non-tempered steel, for example, It has the excellent effect of providing high strength and high toughness with a proof stress ratio suitable for manufacturing PC steel bars, high-strength bolts, and the like.
Claims (1)
後1〜10秒間の強制冷却を行ない、過冷組織生成前に
冷却を中止して放冷し、次に、ストレッチ量0.5〜5
%の仕上圧延を行なうことを特徴とする耐力比の高い高
強度高靭性鋼の製造方法。Steel containing 0.30 wt% or more of C is heated, forced cooling is performed for 1 to 10 seconds after hot rolling, cooling is stopped before the formation of supercooled structure and allowed to cool, and then the amount of stretch is 0.5 ~5
A method for producing high-strength, high-toughness steel with a high yield strength ratio, which comprises performing finish rolling of 1.5%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60103263A JPS61261431A (en) | 1985-05-15 | 1985-05-15 | Manufacture of high strength and toughness steel having high yield strength ratio |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60103263A JPS61261431A (en) | 1985-05-15 | 1985-05-15 | Manufacture of high strength and toughness steel having high yield strength ratio |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61261431A true JPS61261431A (en) | 1986-11-19 |
Family
ID=14349548
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60103263A Pending JPS61261431A (en) | 1985-05-15 | 1985-05-15 | Manufacture of high strength and toughness steel having high yield strength ratio |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61261431A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4726404U (en) * | 1971-04-16 | 1972-11-25 | ||
JPS4993002U (en) * | 1972-11-30 | 1974-08-12 | ||
JPS57153800U (en) * | 1981-03-25 | 1982-09-27 |
-
1985
- 1985-05-15 JP JP60103263A patent/JPS61261431A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4726404U (en) * | 1971-04-16 | 1972-11-25 | ||
JPS4993002U (en) * | 1972-11-30 | 1974-08-12 | ||
JPS57153800U (en) * | 1981-03-25 | 1982-09-27 |
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