JPH02209423A - Production of hot rolled steel plate for working - Google Patents
Production of hot rolled steel plate for workingInfo
- Publication number
- JPH02209423A JPH02209423A JP2825389A JP2825389A JPH02209423A JP H02209423 A JPH02209423 A JP H02209423A JP 2825389 A JP2825389 A JP 2825389A JP 2825389 A JP2825389 A JP 2825389A JP H02209423 A JPH02209423 A JP H02209423A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- steel
- value
- working
- hot rolled
- 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 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 238000001953 recrystallisation Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 13
- 238000005336 cracking Methods 0.000 description 6
- 239000002304 perfume Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、エアコンのコンプレッサーカバー等に用いら
れる、５０％以上の高延性、０．９〜１．０程度のＦ値
、０．２以下の１Δｒ１値の各々を備えると共に縦割れ
をおこさない加工用熱延鋼板の製造方法に関するもので
ある。Detailed Description of the Invention <Industrial Application Field> The present invention is used for compressor covers of air conditioners, etc., with high ductility of 50% or more, F value of about 0.9 to 1.0, and 0.2 or less. The present invention relates to a method for manufacturing a hot-rolled steel sheet for processing which has each of the 1Δr1 values of 1Δr1 and which does not cause longitudinal cracking.
縦割れとは、鋼板から得た円板状のブランクに一段又は
多段の絞り加工を行い、この加工品に２次的な荷重を加
えた時に該加工品のウオール部に生じた脆性的な割れを
指し、該割れが生じない鋼板が２次加工性に優れた鋼板
とされている。Vertical cracking is a brittle crack that occurs in the wall portion of a processed product when a disk-shaped blank obtained from a steel plate is subjected to one-stage or multi-stage drawing processing and a secondary load is applied to the processed product. A steel plate in which such cracks do not occur is considered to be a steel plate with excellent secondary workability.
〈従来の技術〉
上記した用途においては、プレス時に縦割れの発生がな
く、ブランクをプレスした時に上端部に発生する変形の
波高、つまりイヤリングｅ（第３図に示す）が小さい鋼
板が望まれている。<Prior art> In the above-mentioned applications, a steel plate is desired that does not cause vertical cracks during pressing and has a small wave height of the deformation that occurs at the upper end when the blank is pressed, that is, earring e (shown in Figure 3). ing.
近年は絞りの条件が益々厳しくなり、これ等に応える鋼
材の開発が種々検討されている。In recent years, drawing conditions have become increasingly strict, and various efforts are being made to develop steel materials that meet these requirements.
この要望に応える鋼材とその製造方法に関する提案は、
■川崎製鉄技法Ｖｏ１．１９ Ｎｏ、３１９８７ Ｐ４
１〜４６による開示がある。For proposals regarding steel materials and manufacturing methods that meet this demand,
■Kawasaki Steel Techniques Vo1.19 No. 31987 P4
No. 1 to No. 46 are disclosed.
この提案は、０．００１５〜０．００２５％の極低Ｃ材
で、
Ｍｎ：０．０９ 〜０．１１％
ｐ：ｏ、ｏｘ 〜０．１２％
Ｓ ：≦０．．００３％
Ａｌ：０．０２８ 〜０．０３１％
Ｎ ：０．００２２〜０． ００２８％Ｎｂ：０．
００７ 〜０．０１９％
Ｔｉ：０．０２４ 〜０．０２８％
を加え、Ａｒｚ点以上９１０℃で圧延し、５４０℃〜６
８０℃で巻き取る事によって、
ｙｐ：ｔ６．ｓ〜１９．５
Ｅｌ：５３．４〜５９．６
を値：０．８〜０．９２
Δｒ ニー０． １５〜−０． ３７
の材質を有する鋼材を提供するものである。This proposal is an extremely low C material of 0.0015 to 0.0025%, Mn: 0.09 to 0.11%, p: o, ox to 0.12%, S: ≦0. ．． 003% Al: 0.028-0.031% N: 0.0022-0. 0028%Nb:0.
007 - 0.019% Ti: 0.024 - 0.028% was added, rolled at 910°C above the Arz point, and rolled at 540°C - 6
By winding at 80°C, yp:t6. s~19.5 El: 53.4~59.6 Value: 0.8~0.92 Δr Knee 0. 15~-0. The purpose is to provide steel materials having 37 materials.
■又特開昭５２−１２５４１１号公報による提案もある
。■There is also a proposal in Japanese Patent Application Laid-Open No. 52-125411.
この提案は
Ｃ：≦ｏ、ｏｔｏ％
Ｍｎ：０．０３〜０．１５％
Ｓｉ：６０．０１５％
Ｓ ：５０．０５％
Ａｌ：０．０４〜０．１０％
Ｂ ：０．ＯＯ１〜０．００５％
Ｒｅｍ： ０． ００２〜０． ０５％を含み、
Ｒｅｌ１１％ ／ ８％：０．５〜２０．０Ｂ％ ／
Ｎ％二０．２〜１．０
として、Ａｒ３点温度以上の通常の熱間圧延を行い、６
３０〜７１０℃で巻き取り、
ＹＰ ： １８． ２〜２２． ６ ｋｇｆ／ｍ
ｍ２Ｅｌ ：５４ 〜５６％
を値 ：０．９〜０．９８
結晶粒度： ８．０〜８．８番
の材質を有する鋼板を製造する方法である。This proposal is C:≦o, oto% Mn: 0.03-0.15% Si: 60.015% S: 50.05% Al: 0.04-0.10% B: 0. OO1~0.005% Rem: 0. 002~0. Including 05%, Rel11%/8%: 0.5-20.0B%/
Normal hot rolling was carried out at an Ar 3 point temperature or higher with a N% of 0.2 to 1.0.
Winding at 30-710°C, YP: 18. 2-22. 6kgf/m
This is a method for manufacturing a steel plate having a material of m2El: 54 to 56%, value: 0.9 to 0.98, and grain size: 8.0 to 8.8.
一般的には、１Δｒ１値（ｒ値の異方差）とイヤリング
の間には第２図に示す如き相関々係の存在が知られてお
り、３５０ｍｍ φのブランク径をプレスして耳高さが
４ｍｍ以下の良好なイヤリングを得るには、１Δｒ１値
が０．２以下の良加工性を有する鋼板を製造する必要が
ある。Generally, it is known that there is a correlation between the 1Δr1 value (anisotropic difference in r value) and earrings, as shown in Figure 2. In order to obtain good earrings with a diameter of 4 mm or less, it is necessary to manufacture a steel plate with good workability and a 1Δr1 value of 0.2 or less.
又伸びと成形高さ（ａ）の間には、第４図の関係があり
、伸びが高くなる程成形高さは高くなる。この成形高さ
（ａ）は第３図に示す如く、プレス成形時の最浅部寸法
（ｂ）−所要製品斉さ（Ｃ） ＝ （ａ）で示され、所
定の製品を得るに当たってブランク径が持つ余裕代を指
し、これを基にブランク径を小さくする事によって材料
歩留が向上する。従って伸びが大きくなって成形高さが
高（なる鋼板は前記材料歩留が格段に向上する。Furthermore, there is a relationship between elongation and molded height (a) as shown in FIG. 4, and the higher the elongation, the higher the molded height. As shown in Fig. 3, this forming height (a) is expressed as the shallowest part dimension during press forming (b) - required product uniformity (C) = (a). This refers to the allowance that is available, and material yield can be improved by reducing the blank diameter based on this allowance. Therefore, steel sheets with increased elongation and a high forming height significantly improve the material yield.
しかし伸びが５０％程度に達すると成形高さの向上は飽
和状態になる。従ってこの種用途に用いる鋼板は、伸び
が５０％程度あれば成形高さの面からは良いとされてい
る。However, when the elongation reaches about 50%, the improvement in molding height becomes saturated. Therefore, it is said that a steel plate used for this type of use is good from the standpoint of forming height if it has an elongation of about 50%.
〈発明が解決しようとする課題〉
しかし上記した提案でのは、極低Ｃを基礎成分とするの
で、鋼中Ｃをこのレベル迄低下するには多大の処理費を
要し、更に高価なＮｂ、Ｔｉの添加を必要とする事から
、不可避的に製造費は増大する。<Problem to be solved by the invention> However, in the above proposal, since extremely low C is used as the basic component, a large amount of processing cost is required to reduce the C in steel to this level, and even more expensive Nb is required. , since it is necessary to add Ti, the manufacturing cost inevitably increases.
又提案■は、鋼板に含まれている５０〜１１００ｐｐ程
度のＮをＡＩＮ又はＢＮとして固定し、鋼板の非時効性
と伸びを向上しており、このためそれぞれの析出に必要
なＡｌ量と、高温で窒化物を形成するためのＢを所要量
添加するが、Ｂの添加量が０．００１％以上になると本
発明が目標の一つとする０、２以下の１Δｒ］値が安定
して得られない。In addition, proposal (2) fixes about 50 to 1,100 pp of N contained in the steel plate as AIN or BN to improve the anti-aging property and elongation of the steel plate. A required amount of B is added to form nitrides at high temperatures, but if the amount of B added is 0.001% or more, a value of 1Δr of 0.2 or less, which is one of the goals of the present invention, can be stably obtained. I can't do it.
本発明の課題はこれ等の問題点の解消にある。The object of the present invention is to solve these problems.
〈課題を解決するための手段〉
本発明は上記課題を解決するために、
重量％で、
Ｃ：５０．０７％
Ｍｎ：０．０５ 〜０．４％
Ｐ ：＜０．０１％
Ｓ ：＜０．０１％
Ｂ ：０，０００２％〜０．００１％未満を含存する
鋼をＡｒｚ点＋２０’Ｃ以上の再結晶域で圧延後、５５
０℃〜６５０℃の範囲で巻き取る事を手段とするもので
ある。<Means for Solving the Problems> In order to solve the above problems, the present invention provides the following in weight%: C: 50.07% Mn: 0.05 to 0.4% P:<0.01% S:< 0.01% B: After rolling steel containing 0,0002% to less than 0.001% in a recrystallization region above Arz point +20'C, 55
The method is to wind it up at a temperature in the range of 0°C to 650°C.
向上記した各成分それぞれの上限又は下限の限定理由は
次のとおりである。The reason for limiting the upper limit or lower limit of each of the above-mentioned components is as follows.
Ｃは本発明対象の鋼板の材質上からは極低炭素レベルで
ある事は望ましいが、極低炭素レベルへの処理は現状で
は処理費が嵩み、製造費の増大が避けられない。本発明
は以下に述べる特徴ある製造方法で前記した極低炭素レ
ベルの必要性を大幅に軽減しているので、Ｃの下限は製
造の都度必要材質と製造費を配慮して定めると良い。上
限は加工性確保のために設けている。It is desirable that C be at an extremely low carbon level from the viewpoint of the material of the steel sheet that is the object of the present invention, but the treatment to an extremely low carbon level currently requires high processing costs and an increase in manufacturing costs is unavoidable. Since the present invention significantly reduces the need for the above-mentioned extremely low carbon level using the characteristic manufacturing method described below, the lower limit of C should be determined in consideration of the required materials and manufacturing cost each time of manufacturing. The upper limit is set to ensure workability.
Ｍｎの下限は強度維持のため、上限は加工性確保のため
で、Ｂの下限はｔ値の確保と縦割れ防止のため、上限は
１Δｒ１値確保のためである。The lower limit of Mn is to maintain strength, the upper limit is to ensure workability, the lower limit of B is to ensure t value and prevention of vertical cracking, and the upper limit is to ensure 1Δr1 value.
ＰとＳの上限は共に鋼の清浄性のため設けられたもので
、特にＳは硫化物系介在物による加工性の劣化防止を含
んでいる。The upper limits of P and S are both set for the cleanliness of the steel, and S in particular includes prevention of deterioration of workability due to sulfide inclusions.
上記以外の成分についてはＢを除いて、本発明は特に限
定しないが、当分野で通常用いられる成分を通常の理由
で通常の量含有せしめる事は、本発明の基本的効果を阻
害しない範囲で使用する事が出来る。The present invention is not particularly limited with respect to components other than those listed above, except for B, but the inclusion of components commonly used in this field in normal amounts for normal reasons is permitted within the range that does not impede the basic effects of the present invention. It can be used.
又本発明の様に含有Ｃ量が低い鋼は変態点が高く、通常
材の圧延温度より高めに圧延を行ってもＡｒ３点温度直
上の未再結晶域での圧延となり易く、圧延集合組織の発
達により製品の異方性が大きくなる。そこで本発明は、
Ａｒ３点温度直上を避けてＡｒ３点温度＋２０℃以上の
再結晶域で圧延を行う。尚本発明のＡｒ３点（℃）は９
０１−３２５ ＸＣＣ’Ｘ〕＋３３Ｘ （ＳｉＺ 〕−
９２Ｘ ＣＨｒ＋４： ） ＋２８７ Ｘ〔Ｐχ） ＋
４０ｘ （ＡＩＺ ）で求めた値を示している。In addition, steel with a low C content like the one of the present invention has a high transformation point, and even if it is rolled at a higher temperature than that of ordinary materials, it tends to be rolled in the unrecrystallized region just above the Ar3 point temperature, and the rolling texture changes. As the product develops, the anisotropy of the product increases. Therefore, the present invention
Rolling is performed in a recrystallization region of Ar3 point temperature +20° C. or higher, avoiding the temperature directly above Ar3 point temperature. The Ar3 point (°C) of the present invention is 9
01-325 XCC'X〕+33X (SiZ〕-
92X CHr+4: ) +287X[Pχ) +
40x (AIZ).
又巻き取り温度は、良好な伸びとプレス破断荷重の向上
に適した結晶粒径が得られる結晶粒度として、７〜９番
程度を確保するために５５０℃〜６５０℃の範囲として
いる。Further, the winding temperature is set in the range of 550° C. to 650° C. in order to ensure a crystal grain size of about 7 to 9 that provides a crystal grain size suitable for good elongation and improvement of press breaking load.
く作用〉
本発明者等は上記した課題を解消する手段を確立するた
め、表１に示す供試鋼を用いて各種の実験検討を重ねた
。その時の圧延はＡｒ３点温度＋２０“Ｃ以上の温度範
囲を用い、巻き取りは５００〜７００ ’Ｃの温度範囲
で行った。Effect> In order to establish a means for solving the above problems, the present inventors conducted various experimental studies using the test steel shown in Table 1. At that time, rolling was carried out in a temperature range of Ar 3 point temperature + 20'C or higher, and winding was carried out in a temperature range of 500 to 700'C.
表１ （重量％） （注）＊は００．０００７％と００％の２種。Table 1 (weight%) (Note) * indicates two types: 00.0007% and 00%.
この結果、巻き取り温度が５５０℃〜６５０℃の鋼板の
結晶粒度は７〜９番が得られ、これをプレス加工に供し
各５０個のプレス試験を行った。As a result, steel plates with a coiling temperature of 550° C. to 650° C. had crystal grain sizes of No. 7 to No. 9, which were subjected to press working, and 50 pieces of each were subjected to a press test.
■は、イヤリング高さが４．０ｍｍ以下であって１△ｒ
１値が０．０５〜０．１５程度で伸びが５０％から６０
％程度、成形高さが６ｍｍ以上となり、縦割れの発生は
見られなかった。■: The earring height is 4.0mm or less and is 1△r
1 value is about 0.05 to 0.15, elongation is 50% to 60%
%, the molding height was 6 mm or more, and no vertical cracks were observed.
しかし■は、イヤリングは低く、］Δｒ１値が０．０３
〜０．０８程度であり、伸びは５０％から６０％程度、
成形高さは６ｍｍ以上が安定して得られたが縦割れが発
生した。However, ■, the earrings are low, and the ]Δr1 value is 0.03
~0.08, elongation is about 50% to 60%,
Although a molding height of 6 mm or more was stably obtained, vertical cracks occurred.
そこで本発明者等はＢ添加量による差異の発生原因を探
索し第１図の関係を得た。Therefore, the present inventors searched for the cause of the difference due to the amount of B added and obtained the relationship shown in FIG.
これはＢ添加量と１ΔｒＮｉ！及び縦割れの発生状況の
関係を整理したものである。This is the amount of B added and 1ΔrNi! This table summarizes the relationship between the occurrence of vertical cracks and the occurrence of vertical cracks.
従来Ｂは縦割れの防止能力の向上に効果を認められ、前
記した特開昭５２−１２５４１１号公報に記載の如く、
０．００１〜０．００５％程度が添加されている。Conventional B has been recognized to be effective in improving the ability to prevent vertical cracking, and as described in the above-mentioned Japanese Patent Application Laid-Open No. 52-125411,
About 0.001 to 0.005% is added.
しかし図に見える通り、本発明者等はこのＢの影響の整
理により、近年光分野で求められているイヤリングの減
少の原点である）Δｒ）値は、Ｂの添加量が０．００４
％以下になると低減が始まり、その効果は特に０．００
２％程度から更に顕著になり、その現象はＢの微量添加
領域迄継続して０に近づくが、添加量が０．０００２％
未満になると縦割れが発生する事を知見した。However, as can be seen in the figure, the present inventors have sorted out the influence of B, and the (Δr) value, which is the origin of the reduction in earrings that has been sought in the optical field in recent years, has been determined when the amount of B added is 0.004.
% or less, the reduction begins, and the effect is especially 0.00%.
It becomes more noticeable from around 2%, and this phenomenon continues until the area where a small amount of B is added, approaching 0, but when the amount added is 0.0002%
It was found that vertical cracking occurs when the
本発明は上記の如く、縦割れを改善するＢの添加が、他
方ではイヤリングの悪化を助長している新たな知見の総
合的な組み合わせの中で、上記課題の解決手段を確立し
たものである。As mentioned above, the present invention establishes a solution to the above problem through a comprehensive combination of new knowledge that the addition of B improves vertical cracking, but on the other hand, it promotes the deterioration of earrings. .
〈実施例〉 以下に本発明例を比較例と共に示す。<Example> Examples of the present invention are shown below along with comparative examples.
（１）供試鋼成分 （表２に示す。）
（２）圧延条件 （表２に示す。）
（３）材Ｖ （表２に示す。）
表２に明らかな如く、本発明例の調香１〜６はＥｌが５
０．１％以上と高く、１Δｒ１値が０．１６以下と低く
、最終プレス時のイヤリングは３．７ｍｍ以下と低く、
成形高さは６．１ｍｍ以上と高い良好な製品が得られ、
縦割れの発生は全く見られなかった。(1) Test steel composition (shown in Table 2) (2) Rolling conditions (shown in Table 2) (3) Material V (shown in Table 2) As is clear from Table 2, the investigation of the present invention example Incense 1 to 6 have El of 5
It is high at 0.1% or more, the 1Δr1 value is low at 0.16 or less, and the earring at the final press is low at 3.7 mm or less.
A high-quality product with a molding height of 6.1 mm or more was obtained.
No occurrence of vertical cracks was observed.
これに対し比較例の中で、Ｂ量が上限を超えた調香７は
１Δｒ１値が０．２以上となり、イヤリングは４ｍｍを
超えた。On the other hand, among the comparative examples, perfume 7 in which the amount of B exceeded the upper limit had a 1Δr1 value of 0.2 or more, and the earrings exceeded 4 mm.
また成分は本発明条件の範囲内にあるが、仕上げ圧延温
度がＴ域の低温範囲に外れた調香１２はΔｒ１値、イヤ
リング共に高くなった。Further, although the ingredients were within the range of the conditions of the present invention, perfume 12 in which the finish rolling temperature was outside the low temperature range of the T range had high Δr1 values and earrings.
またＢが下限未満の調香９．１１は、イヤリング、成形
高さ共に良好な値を示したが縦割れが多数発生した。Perfume 9.11, in which B was less than the lower limit, showed good values for both earrings and molded height, but many vertical cracks occurred.
また巻き取り温度が高めに外れ、結晶粒が粗大化した調
香１０は、プレス時に縦割れが多数発生した。Further, in Perfume 10 in which the winding temperature was too high and the crystal grains became coarse, many vertical cracks occurred during pressing.
またＣ５Ｍｎが上限を超えた調香８及び巻き取り温度が
下限未満の調香１３は、共にＥｌが４４％以下に低くに
なり、成形高さは３．８ｍｍ及び３．６ｍｍの低い値を
示した。Furthermore, perfume 8 in which C5Mn exceeds the upper limit and perfume 13 in which the winding temperature is below the lower limit both have a low El of 44% or less, and the molding heights are as low as 3.8 mm and 3.6 mm. Ta.
〈発明の効果〉
本発明は、所要量のＣ，Ｍｎと、新たな知見に基づき設
定したＢの所要量を添加し、ＰとＳの含有量を制限した
綱を、Ａｒｘ点＋２０’Ｃ以上の再結晶域で圧延し、所
定の温度で巻き取って加工用熱延鋼板を製造するので、
従来Ｎｂ、Ｔｉを使用して製造していた鋼板と同等又は
それ以上の伸びとｔ値及び１Δｒ１値を有し、優れたイ
ヤリング値と成形高さを発揮し、且つ縦割れが発生しな
いプレス加工用鋼板を前記Ｎｂ、Ｔｉを使用する事なく
製造する事を可能としたもので、優れたプレス加工性を
発揮する鋼板を、処理費、製造費を共に大幅に低減する
と共に、生産性の良い製造を可能にする等、当業分野に
もたらす効果は大きい。<Effects of the Invention> The present invention provides a steel in which the required amounts of C and Mn and the required amount of B set based on new knowledge are added, and the contents of P and S are limited, to an Arx point +20'C or higher. The process involves rolling in the recrystallization zone and coiling at a predetermined temperature to produce hot-rolled steel sheets for processing.
Press processing that has elongation, t value, and 1Δr1 value equal to or higher than steel sheets conventionally manufactured using Nb and Ti, exhibits excellent earring value and forming height, and does not cause vertical cracks. This makes it possible to manufacture steel sheets for industrial use without using the above-mentioned Nb and Ti, and it is possible to produce steel sheets that exhibit excellent press workability, while significantly reducing both processing costs and manufacturing costs, and with high productivity. It has great effects on the field of art, such as making manufacturing possible.
第１図はＢ添加量と１Δｒｌ値及び縦割れの発生状況の
関係を示し、第２図は鋼材のｌΔｒ１値とイヤリング高
さの関係を示し、第３図はプレス成形時の成形高さ等を
示し、第４図は鋼材の伸びと成形高さの関係を示す図で
ある。
特許出願人 新日本製鐵株式会社
代 理 人 小堀 益（他２名）Figure 1 shows the relationship between the amount of B added, the 1Δrl value, and the occurrence of vertical cracks, Figure 2 shows the relationship between the lΔr1 value of steel and the earring height, and Figure 3 shows the forming height during press forming, etc. FIG. 4 is a diagram showing the relationship between the elongation of the steel material and the forming height. Patent applicant: Nippon Steel Corporation Agent: Masu Kobori (and 2 others)
Claims (1)
圧延後、５５０℃〜６５０℃の範囲で巻き取る事を特徴
とする加工用熱延鋼板の製造方法。(1) In weight%, C: ≦0.07% Mn: 0.05 to 0.4% P: <0.01% S: <0.01% B: 0.0002% to less than 0.001% A method for producing a hot-rolled steel sheet for processing, which comprises rolling a steel containing the following in a recrystallization zone of Ar_3 points +20 degrees Celsius or higher, and then winding the steel at a temperature in the range of 550 to 650 degrees Celsius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028253A JP2793222B2 (en) | 1989-02-06 | 1989-02-06 | Manufacturing method of hot rolled steel sheet for processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028253A JP2793222B2 (en) | 1989-02-06 | 1989-02-06 | Manufacturing method of hot rolled steel sheet for processing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02209423A true JPH02209423A (en) | 1990-08-20 |
| JP2793222B2 JP2793222B2 (en) | 1998-09-03 |
Family
ID=12243407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1028253A Expired - Lifetime JP2793222B2 (en) | 1989-02-06 | 1989-02-06 | Manufacturing method of hot rolled steel sheet for processing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2793222B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63143225A (en) * | 1986-12-04 | 1988-06-15 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled steel sheet having superior workability |
| JPS63258271A (en) * | 1987-04-15 | 1988-10-25 | Hino Motors Ltd | Front/rear wheel steering system for vehicle |
| JPH02104614A (en) * | 1988-10-13 | 1990-04-17 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled steel sheet having high workability |
-
1989
- 1989-02-06 JP JP1028253A patent/JP2793222B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63143225A (en) * | 1986-12-04 | 1988-06-15 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled steel sheet having superior workability |
| JPS63258271A (en) * | 1987-04-15 | 1988-10-25 | Hino Motors Ltd | Front/rear wheel steering system for vehicle |
| JPH02104614A (en) * | 1988-10-13 | 1990-04-17 | Sumitomo Metal Ind Ltd | Manufacture of hot rolled steel sheet having high workability |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2793222B2 (en) | 1998-09-03 |
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