JPH04350122A - Production of high strength and lightweight vessel for lp gas - Google Patents

Production of high strength and lightweight vessel for lp gas

Info

Publication number
JPH04350122A
JPH04350122A JP15260891A JP15260891A JPH04350122A JP H04350122 A JPH04350122 A JP H04350122A JP 15260891 A JP15260891 A JP 15260891A JP 15260891 A JP15260891 A JP 15260891A JP H04350122 A JPH04350122 A JP H04350122A
Authority
JP
Japan
Prior art keywords
strength
temperature
hot
lightweight
gas
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.)
Withdrawn
Application number
JP15260891A
Other languages
Japanese (ja)
Inventor
Toshio Kajiki
梶  木  俊  夫
Takuo Hosoda
細  田  卓  夫
Zenichi Shibata
柴  田  善  一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP15260891A priority Critical patent/JPH04350122A/en
Publication of JPH04350122A publication Critical patent/JPH04350122A/en
Withdrawn legal-status Critical Current

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  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PURPOSE:To produce a high strength and lightweight vessel for LP gas having the desired strength and capable of thinning and lightening weight. CONSTITUTION:A slab of a steel having a composition consisting of, by weight, 0.05-0.15% C, <=0.04% Si, 0.30-1.00% Mn, 0.010-0.100% Al, 0.10-2.0% Cu, 0.10-2.0% Ni, and the balance Fe with inevitable impurities is heated up to 1100-1200 deg.C. After the completion of hot rolling, the resulting hot rolled steel plate is coiled at 400-500 deg.C, subjected to cold working where a working strain of >=10% is applied, and then subjected to heating at 600-700 deg.C for 10min-2hr. Accordingly, by simultaneously incorporating Cu and Ni in combination, the hot rolled steel plate excellent in formability can be formed into a final product having >=50kgf/ mm<2> tensile strength by means of cold working and thinning can be attained.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明は高強度軽量LPガス容器
の製造方法に関し、させに詳しくは、プレス成形の冷間
加工工程においては冷間加工性に優れた熱間圧延板を使
用し、加工後には加工歪除去の焼鈍によって、引張強さ
を50kgf/mm2以上の高強度を有する耐圧性に優
れたLPガス容器の製造方法に関するものである。
[Industrial Application Field] The present invention relates to a method for manufacturing a high-strength, lightweight LP gas container, and more specifically, in the cold working process of press forming, a hot rolled plate with excellent cold workability is used, The present invention relates to a method for manufacturing an LP gas container with high tensile strength of 50 kgf/mm2 or more and excellent pressure resistance by annealing to remove processing strain after processing.

【0002】0002

【従来技術】一般に、ガス容器は強度水準が41K級、
45K級であり、かつ、板厚が約3.2mmの熱間圧延
鋼板をプレス成形と溶接により製造され、重量は20k
gおよび50kgのものが主な製品である。
[Prior Art] Generally, gas containers have a strength level of 41K class.
Manufactured by press forming and welding from 45K class hot rolled steel plate with a thickness of approximately 3.2mm, and weighs 20kg.
The main products are 50kg and 50kg.

【0003】そして、使用する鋼板の薄肉化により容器
の軽量化を図ることで、運搬作業の負荷軽減および素材
の鋼板を節約できるという好結果が得られる。  しか
し、ガス容器は重要、かつ、厳格な保安部品であり、従
って、薄肉化による容器の強度低下は認められないもの
である。
[0003] By reducing the weight of the container by reducing the thickness of the steel plate used, favorable results can be obtained in that the burden of transportation work can be reduced and the steel plate used as a raw material can be saved. However, gas containers are important and strict safety components, and therefore, a decrease in the strength of the container due to thinning is not acceptable.

【0004】その対策として、従来においては熱間圧延
鋼板にNbを含有させることにより、析出強化および結
晶粒の細粒化による鋼板の強度向上を図ってきている。
[0004] As a countermeasure against this problem, conventional efforts have been made to incorporate Nb into hot rolled steel sheets in order to improve the strength of the steel sheets through precipitation strengthening and grain refinement.

【0005】また、ガス容器の製造工程において、鋼板
の強度が向上することは、 (1)プレス加工面において、プレス圧力が大きくなり
、プレス機械の大型化が必要となり、また、金型が損傷
し安い。 (2)製品面においては、プレス加工後のスプリングバ
ックが大きく、皺が発生する。 (3)Nb含有による異方性のために、イヤリングが発
生し、また、このイヤリングによる縦割れが発生する。 (4)歪取り焼鈍においては、焼鈍温度が高くなるため
、炉の能力増強を行なわなければならない。 等の問題点がある。
[0005] In addition, in the manufacturing process of gas containers, improving the strength of steel sheets means that (1) the press pressure increases on the press processing surface, making it necessary to increase the size of the press machine, and causing damage to the mold. It's cheap. (2) On the product side, springback after press working is large and wrinkles occur. (3) Earrings occur due to the anisotropy due to Nb content, and vertical cracks occur due to the earrings. (4) In strain relief annealing, the annealing temperature becomes high, so the capacity of the furnace must be increased. There are other problems.

【0006】[0006]

【発明が解決しようとする課題】本発明は上記に説明し
た従来におけるLPガス容器の製造に際して発生する種
々の問題点に鑑み、本発明者が鋭意研究を行なった結果
、冷間加工性を損なうことなく、設備の改造を必要とせ
ず、かつ、歩留の低下をともなうことなく、LPガス容
器製造工程中の歪取り焼鈍を利用して、所望の強度を保
持し、薄肉、軽量化を可能とすることができる高強度軽
量LPガス容器の製造方法を開発したのである。
[Problems to be Solved by the Invention] The present invention has been made in view of the various problems that occur during the production of conventional LP gas containers as described above, and as a result of intensive research by the present inventor, By using strain relief annealing during the LP gas container manufacturing process, it is possible to maintain the desired strength, make the wall thinner, and reduce the weight without requiring modification of equipment or reducing yield. We have developed a method for manufacturing high-strength, lightweight LP gas containers.

【0007】[0007]

【課題を解決するための手段】本発明に係る高強度軽量
LPガス容器の製造方法の特徴とするところは、C  
0.05〜0.15wt%、Si  0.04wt%以
下、Mn  0.30〜1.00wt%、Al0.01
0〜0.100wt%、Cu  0.10〜2.0wt
%、Ni  0.10〜2.0wt%を含有し、残部F
eおよび不可避不純物からなる鋼片を、1100〜12
00℃の温度に加熱し、熱間圧延終了後400〜500
℃の温度で巻取り、この熱間圧延鋼板を10%以上の加
工歪が加わる冷間加工を行ない、次いで、600〜70
0℃の温度において10分間〜2時間加熱することにあ
る。
[Means for Solving the Problems] The method for manufacturing a high-strength, lightweight LP gas container according to the present invention is characterized by:
0.05-0.15wt%, Si 0.04wt% or less, Mn 0.30-1.00wt%, Al0.01
0-0.100wt%, Cu 0.10-2.0wt
%, Ni 0.10 to 2.0 wt%, the balance F
A steel piece consisting of e and inevitable impurities was heated to 1100 to 12
Heated to a temperature of 00℃ and 400 to 500℃ after hot rolling.
The hot-rolled steel sheet is rolled up at a temperature of
It consists in heating at a temperature of 0° C. for 10 minutes to 2 hours.

【0008】本発明に係る高強度軽量LPガス容器の製
造方法について、以下詳細に説明する。
The method for manufacturing a high-strength, lightweight LP gas container according to the present invention will be explained in detail below.

【0009】先ず、本発明に係る高強度軽量LPガス容
器の製造方法において使用する鋼の含有成分および成分
割合について説明する。
First, the components and component ratios of the steel used in the method for manufacturing a high-strength, lightweight LP gas container according to the present invention will be explained.

【0010】Cは鋼板の強度を高くする元素であり、含
有量が0.05wt%未満では所望の強度を確保するこ
とができず、また、0.15wt%を越えて含有させる
と延性の低下を招来し、プレス成形性を損なうと共に溶
接性を阻害する。よって、プレス成形性、溶接性および
剛性という面からC含有量は0.05〜0.15wt%
とする。
[0010] C is an element that increases the strength of steel sheets; if the content is less than 0.05 wt%, the desired strength cannot be secured, and if the content exceeds 0.15 wt%, the ductility decreases. This results in impairing press formability and inhibiting weldability. Therefore, in terms of press formability, weldability, and rigidity, the C content is 0.05 to 0.15 wt%.
shall be.

【0011】Siは熱間圧延時にSi赤スケールが発生
し易くなり、鋼板表面性状が劣化する。よって、Si含
有量は0.04wt%以下とする。
[0011] Si tends to generate Si red scale during hot rolling, which deteriorates the surface quality of the steel sheet. Therefore, the Si content is set to 0.04 wt% or less.

【0012】Mnは焼入れ性を向上させ、強度を高くす
ると同時に熱間圧延時のSによる熱間脆性を防止する元
素であり、含有量が0.30wt%未満では上記の効果
は期待することはできず、また、1.00wt%を越え
て含有させると強度が高くなりすぎ、さらに、製造時の
Mnの偏析増大に伴って冷間加工性が低下する。よって
、Mn含有量は0.30〜1.00wt%とする。
Mn is an element that improves hardenability, increases strength, and at the same time prevents hot embrittlement caused by S during hot rolling. If the content is less than 0.30 wt%, the above effects cannot be expected. Moreover, if the content exceeds 1.00 wt%, the strength will become too high, and furthermore, cold workability will decrease due to increased segregation of Mn during manufacturing. Therefore, the Mn content is set to 0.30 to 1.00 wt%.

【0013】Alは脱酸元素であり、含有量が0.01
0wt%未満ではこの効果は少なく、また、0.100
wt%を越えて含有させると介在物が増大する。よって
、Al含有量は0.010〜0.100wt%とする。
[0013] Al is a deoxidizing element, and the content is 0.01
This effect is small below 0 wt%, and 0.100 wt%
If the content exceeds wt%, inclusions will increase. Therefore, the Al content is set to 0.010 to 0.100 wt%.

【0014】Cuは時効硬化性を高くする基本的な元素
であり、熱間圧延条件と組合せで熱間圧延鋼板の段階で
は、比較的軟かく、冷間加工および歪焼鈍後に高強度を
得るためには必須の元素であり、含有量が0.10wt
%未満では最終製品において目的とする強度が得られず
、また、2.0wt%を越えて含有させると高強度とな
りすぎる。よって、Cu含有量は0.10〜2.0wt
%とする。
[0014]Cu is a basic element that increases age hardenability, and in combination with hot rolling conditions, it is relatively soft at the stage of hot rolled steel sheets and has high strength after cold working and strain annealing. It is an essential element, and the content is 0.10wt.
If the content is less than 2.0 wt%, the desired strength will not be obtained in the final product, and if the content exceeds 2.0 wt%, the strength will be too high. Therefore, the Cu content is 0.10 to 2.0wt
%.

【0015】Niは強度を高くし、Cuの熱間脆性を防
止する元素であり、含有量が0.10wt%未満では熱
間脆性を防止することができず、また、2.0wt%を
越えて含有させると鋼板の強度が高くなりすぎる。よっ
て、Ni含有量は0.10〜2.0wt%とする。
[0015] Ni is an element that increases strength and prevents hot embrittlement of Cu. If the content is less than 0.10 wt%, hot embrittlement cannot be prevented, and if the content exceeds 2.0 wt%, the hot embrittlement cannot be prevented. If it is contained, the strength of the steel plate becomes too high. Therefore, the Ni content is set to 0.10 to 2.0 wt%.

【0016】なお、本発明に係る高強度軽量LPガス容
器の製造方法において、使用する鋼は上記に説明した必
須成分および基となるFeおよび不可避不純物であり、
そして、優れた冷間加工性を保持するためには、P、S
、O、N等の元素は冷間加工性に有害であるから、低け
れば低い程望ましい。
[0016] In the method for manufacturing a high-strength, lightweight LP gas container according to the present invention, the steel used has the above-mentioned essential components and basic Fe and inevitable impurities,
In order to maintain excellent cold workability, P, S
Since elements such as , O, and N are harmful to cold workability, the lower the content, the more desirable.

【0017】次に、本発明に係る高強度軽量LPガス容
器の製造方法における、熱処理について説明する。
Next, heat treatment in the method for manufacturing a high-strength, lightweight LP gas container according to the present invention will be explained.

【0018】上記に説明した含有成分および成分割合の
鋼を通常の圧延の場合と同様に、加熱温度は1100〜
1200℃の範囲とするのがよく、1100℃未満の温
度では通常の連続式熱間圧延機による圧延は困難であり
、また、1200℃を越える加熱温度ではNiが含有さ
れているにも拘わらず、Cu含有による鋼特有の熱間脆
性が発生する。
[0018] As in the case of ordinary rolling of steel having the above-described components and component ratios, the heating temperature is 1100-1100°C.
The range is preferably 1200°C; at temperatures below 1100°C, it is difficult to roll with a normal continuous hot rolling mill, and at heating temperatures above 1200°C, despite the Ni content. , hot embrittlement peculiar to steel occurs due to Cu content.

【0019】この加熱温度において熱間圧延を行なうの
であるが、特に、熱間圧延の条件は限定的ではなく、さ
らに、熱間圧延後の熱間圧延鋼板の巻取り温度は400
〜500℃で巻取るのである。
Hot rolling is carried out at this heating temperature, but the conditions for hot rolling are not particularly limited, and the coiling temperature of the hot rolled steel sheet after hot rolling is 400°C.
It is wound up at ~500°C.

【0020】巻取り温度が400℃未満および500℃
を越えると引張強さが高くなり、この加熱温度範囲にお
いて、引張強さが45kgf/mm2以下となるので、
次に行なう冷間加工において圧延負荷は比較的小さくて
よいのである。
[0020] Winding temperature is less than 400°C and 500°C
If the temperature exceeds , the tensile strength becomes high, and in this heating temperature range, the tensile strength is 45 kgf/mm2 or less,
In the subsequent cold working, the rolling load may be relatively small.

【0021】次いで、この熱間圧延鋼板を10%以上の
加工歪が加わる冷間加工を行なうことにより、引張強さ
は50kgf/mm2以上となる。
[0021] Next, this hot-rolled steel plate is subjected to cold working to which a working strain of 10% or more is applied, so that the tensile strength becomes 50 kgf/mm2 or more.

【0022】また、冷間加工率20%において、引張強
さは60kgf/mm2以上となり、そして、この場合
時効処理温度は600〜750℃とし、かつ、時効処理
時間は10分間〜2時間とするのがよい。
[0022] Also, at a cold working rate of 20%, the tensile strength is 60 kgf/mm2 or more, and in this case, the aging treatment temperature is 600 to 750°C, and the aging treatment time is 10 minutes to 2 hours. It is better.

【0023】[0023]

【実  施  例】本発明に係る高強度軽量LPガス容
器の製造方法について、実施例を説明する。
[Example] Examples of the method for manufacturing a high-strength, lightweight LP gas container according to the present invention will be described.

【0024】[0024]

【実 施 例】表1に示す含有成分および成分割合の鋼
を通常の溶製法により溶解後、造塊して板厚を3.2 
mmとした。
[Example] After melting steel with the ingredients and proportions shown in Table 1 using the normal melting method, it is made into ingots to a plate thickness of 3.2 mm.
mm.

【0025】成形性に優れた熱間圧延鋼板を冷間加工を
行うことにより引張強さ50kgf/mm2以上とする
ことができる。
[0025] A hot-rolled steel sheet with excellent formability can be cold-worked to have a tensile strength of 50 kgf/mm2 or more.

【0026】[0026]

【表1】[Table 1]

【0024】[0024]

【発明の効果】以上説明したように、本発明に係る高強
度軽量LPガス容器の製造方法は上記の構成であるから
、特に、Cu、Niを同時に複合含有させることにより
、成形性に優れた熱間圧延鋼板を使用して、冷間加工に
より最終製品の引張強さを50kgf/mm2とするこ
とができ、従って、薄肉化が図れるので軽量のLPガス
容器を製造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。
[Effects of the Invention] As explained above, since the method for manufacturing a high-strength, lightweight LP gas container according to the present invention has the above-mentioned structure, it has excellent moldability, especially by simultaneously containing Cu and Ni in a composite manner. Using hot-rolled steel plates, the tensile strength of the final product can be made 50 kgf/mm2 by cold working, which makes it possible to manufacture lightweight LP gas containers because the walls can be made thinner. It is effective.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】C  0.05〜0.15wt%、Si0
.04wt%以下、Mn  0.30〜1.00wt%
、Al0.010〜0.100wt%、Cu0.10〜
2.0wt%、Ni0.10〜2.0wt%を含有し、
残部Feおよび不可避不純物からなる鋼片を、1100
〜1200℃の温度に加熱し、熱間圧延終了後400〜
500℃の温度で巻取り、この熱間圧延鋼板を10%以
上の加工歪が加わる冷間加工を行ない、次いで、600
〜700℃の温度において10分間〜2時間加熱するこ
とを特徴とする高強度軽量LPガス容器の製造方法。
Claim 1: C 0.05-0.15wt%, Si0
.. 04wt% or less, Mn 0.30-1.00wt%
, Al0.010~0.100wt%, Cu0.10~
2.0 wt%, Ni 0.10 to 2.0 wt%,
A steel billet consisting of the balance Fe and unavoidable impurities was heated to 1100
Heated to a temperature of ~1200℃, and heated to a temperature of 400℃ after hot rolling.
The hot-rolled steel sheet is rolled up at a temperature of 500°C, cold-worked to apply a working strain of 10% or more, and then rolled at a temperature of 600°C.
A method for manufacturing a high-strength, lightweight LP gas container, which comprises heating at a temperature of ~700°C for 10 minutes to 2 hours.
JP15260891A 1991-05-28 1991-05-28 Production of high strength and lightweight vessel for lp gas Withdrawn JPH04350122A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15260891A JPH04350122A (en) 1991-05-28 1991-05-28 Production of high strength and lightweight vessel for lp gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15260891A JPH04350122A (en) 1991-05-28 1991-05-28 Production of high strength and lightweight vessel for lp gas

Publications (1)

Publication Number Publication Date
JPH04350122A true JPH04350122A (en) 1992-12-04

Family

ID=15544120

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15260891A Withdrawn JPH04350122A (en) 1991-05-28 1991-05-28 Production of high strength and lightweight vessel for lp gas

Country Status (1)

Country Link
JP (1) JPH04350122A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431852B1 (en) * 1999-12-28 2004-05-20 주식회사 포스코 A method for manufacturing high strength thick steel sheet and a vessel by deep drawing
KR100470670B1 (en) * 2000-10-04 2005-03-07 주식회사 포스코 Method for Manufacturing Steel Plate for Pressure Vessel with Superior Workability and High Tensile Strength and Method for Manufacturing Pressure Vessel with High Tensile Strength Using the Steel Plate
KR100770949B1 (en) * 2006-12-08 2007-10-26 동부제강주식회사 Thin steel sheet having high strength, for pressed-gas vessel and manufacturing process thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431852B1 (en) * 1999-12-28 2004-05-20 주식회사 포스코 A method for manufacturing high strength thick steel sheet and a vessel by deep drawing
KR100470670B1 (en) * 2000-10-04 2005-03-07 주식회사 포스코 Method for Manufacturing Steel Plate for Pressure Vessel with Superior Workability and High Tensile Strength and Method for Manufacturing Pressure Vessel with High Tensile Strength Using the Steel Plate
KR100770949B1 (en) * 2006-12-08 2007-10-26 동부제강주식회사 Thin steel sheet having high strength, for pressed-gas vessel and manufacturing process thereof

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