JP3260446B2 - Enamelled steel sheet with good aging resistance and weldability - Google Patents
Enamelled steel sheet with good aging resistance and weldabilityInfo
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- JP3260446B2 JP3260446B2 JP27162592A JP27162592A JP3260446B2 JP 3260446 B2 JP3260446 B2 JP 3260446B2 JP 27162592 A JP27162592 A JP 27162592A JP 27162592 A JP27162592 A JP 27162592A JP 3260446 B2 JP3260446 B2 JP 3260446B2
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- weldability
- steel sheet
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- resistance
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐つまとび性、焼成歪
などのほうろう用鋼板としての最低限の特性を満足し、
かつ耐時効性および溶接性の良好なほうろう用鋼板に関
するものである。BACKGROUND OF THE INVENTION The present invention satisfies the minimum properties required for enameled steel sheets, such as anti-sticking property and firing strain,
The present invention also relates to an enameled steel sheet having good aging resistance and weldability.
【０００２】[0002]
【従来の技術】ほうろうは鋼板表面にガラス質を焼き付
けた不燃性材料で耐熱性をはじめとして、耐候性、耐薬
品性、耐水性および耐汚染性など種々の特性を備える
他、表面が美麗であるという種々の特長を有し、広い用
途にわたって使用されている。これにかかわるほうろう
用の素地は主に冷延鋼板が多く、要求される特性として
は耐焼成歪特性、耐つまとび性、密着性および耐泡・黒
点性などがあり、これらの特性を満足し、かつプレス成
形性ならびに溶接性なども備えていなければならない。2. Description of the Related Art An enamel is a non-combustible material obtained by baking glass on the surface of a steel sheet and has various characteristics such as heat resistance, weather resistance, chemical resistance, water resistance and stain resistance. It has various features and is used for a wide range of applications. The base materials for enamels related to this are mainly cold-rolled steel sheets, and the required properties include fire-strain resistance, toe skipping resistance, adhesion, and foam and black spot resistance. It must also have press formability and weldability.
【０００３】プレス成形性に優れた連鋳製ほうろう用鋼
板の代表的なものは、特公平４−16539 号公報に開示さ
れているようなTi添加Alキルド鋼である。しかしなが
ら、この種の鋼板は、プラズマ溶接やTIG 溶接などで継
ぎ手溶接をした際、溶接部が凹状になったり、ブローホ
ールを形成したりし、ほうろう加工後の表面に筋状欠陥
や泡欠陥を発生したりしていた。A typical example of a continuously cast enameled steel sheet having excellent press formability is a Ti-added Al-killed steel as disclosed in Japanese Patent Publication No. 4-16539. However, when this type of steel plate is subjected to joint welding such as plasma welding or TIG welding, the welded portion becomes concave or forms a blow hole, and streaky defects or foam defects are generated on the surface after enamelling. Or had occurred.
【０００４】従来、この欠陥を防止する手段としては、
ほうろうメーカーにおいて溶接速度を遅くしたり、溶接
電流を比較的高めに設定したりする方法が取られていた
が、必ずしも適切な手段ではなく、生産性が低下する上
に、かなりの不良率で欠陥製品を発生しているのが現状
である。また最近、ほうろうメーカーでは特開平２−23
5550号公報に開示されているようなほうろうの表面特性
が良好であり、かつ溶接性が優れていることから高酸素
鋼の使用が多くなってきている。しかしながら、高酸素
鋼は酸素量が高いがゆえにTi、Zrなどの炭化物、窒化物
形成元素を添加してもほとんどが酸化物となってしまう
ため歩留りが悪く、完全に固溶Ｃ、Ｎを固定させること
ができないため材質の時効劣化が起こりやすく、プレス
成形時にストレッチャー・ストレインが発生したり、割
れが生じやすかったりしていた。Conventionally, means for preventing this defect include:
Enamel manufacturers used methods to slow the welding speed or set the welding current relatively high.However, this was not always an appropriate measure, resulting in reduced productivity and a significant defect rate. At present, products are being generated. Recently, enamel manufacturers have disclosed Japanese Patent Application Laid-Open No. 2-23.
The use of high oxygen steel has been increasing due to the good surface properties of the enamel as disclosed in Japanese Patent No. 5550 and excellent weldability. However, high oxygen steel has a high oxygen content, so even if carbides or nitride forming elements such as Ti and Zr are added, most of them become oxides, so the yield is poor and solid solution C and N are completely fixed. Since it was not possible to perform the aging, deterioration of the material was likely to occur due to aging, and stretcher / strain was generated at the time of press molding, and cracks were easily generated.
【０００５】[0005]
【発明が解決しようとする課題】そこで、本発明はプレ
ス成形性がTi添加Alキルド鋼と同等もしくはそれ以上で
あり、かつ耐時効性および溶接性が良好なほうろう用鋼
板を提供することを目的とするものである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an enameled steel sheet having press formability equal to or higher than that of Ti-added Al-killed steel, and having excellent aging resistance and weldability. It is assumed that.
【０００６】[0006]
【課題を解決するための手段】すなわち、本発明は、重
量比にして、 Ｃ：0.0050％以下、 Mn：0.05〜1.0 ％、 Al：0.010 ％以下、 Ｎ：0.0034％以下、 Cu：0.010 〜0.100 ％、 Ｏ：0.020 超〜0.100 ％、 Ｂ：0.0030超〜0.0200％、 Ｖ：0.001 〜0.100 ％、 を含み、さらにNb、Ta、Ｗ、Mo、Crの内から１種または
２種以上を合計で 0.001％〜0.100 ％を含有し、残部が
鉄および不可避的不純物から成る耐時効性および溶接性
の良好なほうろう用鋼板である。SUMMARY OF THE INVENTION Namely, the present invention is, by weight ratio, C: 0.0050% or less, Mn: 0.05~1.0%, Al: 0.010% or less, N: 0.00 34% or less, Cu: 0.010 ~ 0.100%, O: more than 0.020 to 0.100%, B: more than 0.0030 to 0.0200%, V: 0.001 to 0.100%, and one or more of Nb, Ta, W, Mo, and Cr in total This is an enameled steel sheet containing 0.001% to 0.100% by weight, with the balance consisting of iron and unavoidable impurities having good aging resistance and weldability.
【０００７】また、Seを 0.001〜 0.050％を残部の鉄の
同量と置換してなる耐時効性および溶接性の良好なほう
ろう用鋼板である。[0007] Further, the present invention is an enameled steel sheet having excellent aging resistance and weldability by replacing 0.001 to 0.050% of Se with the same amount of iron as the balance.
【０００８】[0008]
【作用】すなわち、本発明は酸素との結合力がTi、Zrよ
りも弱いＶ、Ｂを添加し、さらにNb、Ta、Ｗ、Mo、Crを
複合添加させることによって高酸素を維持しつつ、かつ
材質劣化の原因になる固溶Ｃ、Ｎを有効に炭化物あるい
は窒化物として固定し、従来、問題であった高酸素鋼の
時効劣化を防止させてプレス成形性と溶接性とを向上さ
せた鋼板を開示したものである。That is, the present invention maintains high oxygen by adding V and B, which have a weaker bonding force with oxygen than Ti and Zr, and further adding Nb, Ta, W, Mo, and Cr in combination. In addition, solid solution C and N, which cause deterioration of the material, are effectively fixed as carbides or nitrides, and the aging deterioration of high oxygen steel, which has been a problem in the past, is prevented to improve press formability and weldability. It discloses a steel plate.
【０００９】次に本発明のほうろう用鋼板の成分限定理
由について説明する。 Ｃ：0.0050％以下 Ｃは侵入型固溶元素であり、0.0050％超の含有はプレス
成形性を著しく劣化させることからＣの含有は極力低減
する必要がある。よって、本発明のＣ量の上限を 0.005
％とした。Next, the reasons for limiting the components of the enameled steel sheet of the present invention will be described. C: 0.0050% or less C is an interstitial solid solution element, and if it exceeds 0.0050%, press formability is significantly deteriorated, so that the content of C must be reduced as much as possible. Therefore, the upper limit of the C content of the present invention is 0.005.
%.
【００１０】Mn：0.05〜1.0 ％ Mnは赤熱脆性の原因になるＳをMnS として固定するの
に、また本発明のように酸素が多量に添加させている成
分系においては、MnO を形成してつまとび欠陥の原因に
なる水素をトラップさせることができることから、本発
明では有効な元素である。これらの効果を引き出すに
は、少なくとも0.05％以上の含有量が必要である。しか
しながら、1.0 ％超の添加は溶鋼コストを上昇させてし
まうことから上限を1.0 ％とした。Mn: 0.05 to 1.0% Mn fixes S, which causes red hot embrittlement, as MnS. In a component system containing a large amount of oxygen as in the present invention, MnO forms MnO. Since it is possible to trap hydrogen, which causes pinch defects, it is an effective element in the present invention. To obtain these effects, the content is required to be at least 0.05% or more. However, the addition of more than 1.0% increases the cost of molten steel, so the upper limit was made 1.0%.
【００１１】Al：0.010 ％以下 Alは、通常、製鋼段階での脱酸剤として使用されるもの
であるが、本発明では酸素を耐つまとび性を改善する目
的から特定範囲にコントロールしている。そのためAlは
それに必要な量があれば十分である。しかしながら、0.
01％超の含有量は本発明において重要な元素である酸素
をAl2O3 として除去してしまう危険性があることから本
発明では0.01％以下の範囲に限定した。Al: 0.010% or less Al is usually used as a deoxidizing agent in the steelmaking stage. In the present invention, oxygen is controlled to a specific range for the purpose of improving the toughness. . Therefore, Al is sufficient if it has the necessary amount. However, 0.
If the content exceeds 01%, there is a risk that oxygen, which is an important element in the present invention, will be removed as Al 2 O 3. Therefore, the content is limited to 0.01% or less in the present invention.
【００１２】Ｏ：0.020 超〜0.100 ％ Ｏは、耐つまとび性を改善する元素であり、また本発明
では溶接性を著しく向上させる元素であることからその
含有は非常に重要であるが、0.020 ％以下の含有量では
溶接性の著しい向上は得られない。一方、0.10％超の含
有では連鋳スラブのブローホールが多く、スラブ表面手
入れのコストがかかる上、製品歩留りが悪くなることか
ら、その含有量の範囲を0.020 ％超〜0.100 ％とした。O: more than 0.020% to 0.100% O is an element that improves the toughness and is an element that significantly improves the weldability in the present invention, so its content is very important. If the content is less than 10%, no remarkable improvement in weldability can be obtained. On the other hand, if the content exceeds 0.10%, the number of blow holes in the continuous cast slab is large, the cost of slab surface maintenance is increased, and the product yield is deteriorated. Therefore, the content range is set to more than 0.020% to 0.100%.
【００１３】 Ｎ：0.0034％ 以下 0.0034％超のＮの含有は、材質にとって極めて有害であ
り、Ｂあるいはその他の高価な窒化物形成元素を多量に
添加しなければならなくなることからＮ量の上限を0.00
34％とした。 Cu：0.010 〜0.100 ％ Cuはほうろう前処理時の酸洗速度をコントロールする目
的から添加している元素であり、これらの効果を引き出
すには0.010 ％以上の含有量が好ましい。しかしなが
ら、0.100 ％超の添加はほうろう前処理時に酸洗されに
くくなり、密着性に有効な微細な凹凸が鋼板表面に形成
されなくなることから、Cuの添加量を0.010 〜0.100 ％
とした。[0013] N: content of 0.00 34% or less 0.00 34% greater than N is extremely harmful to the material, the B or other expensive nitride forming element since it must yield a large amount of added amount of N 0.00 upper limit
34 %. Cu: 0.010 to 0.100% Cu is an element added for the purpose of controlling the pickling rate during the enamel pretreatment, and a content of 0.010% or more is preferable in order to obtain these effects. However, the addition of more than 0.100% makes it difficult to pickle during the enamel pretreatment and prevents fine irregularities effective for adhesion from being formed on the steel sheet surface. Therefore, the addition amount of Cu is set to 0.010 to 0.100%.
And
【００１４】Ｂ：0.0030超〜0.0200％ Ｂは時効劣化の原因になる固溶ＮをBNとして固定し、プ
レス成形性を確保する効果をもっており、また、耐２次
加工脆性を著しく向上させるに有効な元素であるが0.00
30％以下ではほとんどが酸化物となり、以上の効果がな
くなってしまう。また、0.0200％超の含有は熱間圧延時
に割れが生じやすくなってしまうことから本発明ではＢ
量の範囲を0.0030超〜0.0200％とした。B: more than 0.0030% to 0.0200% B has the effect of fixing solute N, which causes deterioration of aging, as BN to ensure press formability, and is also effective for remarkably improving the resistance to secondary working brittleness. Element is 0.00
If it is less than 30%, most of it will be oxide, and the above effects will be lost. Further, if the content exceeds 0.0200%, cracks are likely to occur during hot rolling.
The amount ranged from more than 0.0030 to 0.0200%.
【００１５】Ｖ：0.001 〜0.100 ％ Ｖは時効劣化の原因になる固溶Ｃ、Ｎを固定する元素と
して有効である。しかしながら0.001 ％未満の添加では
ほとんどが酸化物となってしまうことから材質向上の効
果が得られない。また、0.100 ％超の添加量では得られ
る効果が飽和してしまうことから本発明ではＶ添加量の
範囲を0.001 〜0.100 ％とした。V: 0.001 to 0.100% V is effective as an element for fixing solid solution C and N which cause aging deterioration. However, if the content is less than 0.001%, almost all of it becomes an oxide, so that the effect of improving the material cannot be obtained. Further, if the added amount exceeds 0.100%, the effect obtained is saturated, so in the present invention, the range of the added amount of V is set to 0.001 to 0.100%.
【００１６】Nb、Ta、Ｗ、Mo、Cr：0.001 〜0.100 ％ Nb、Ta、Ｗ、Mo、Crのいずれも炭化物を形成しうる元素
であり、時効劣化の原因になる固溶Ｃを減少させること
ができる元素である。その効果を引き出すためには１種
または２種以上を合計で0.001 ％以上含有させる必要が
ある。しかしながら、0.100 ％超の含有は溶鋼コストを
著しく高くしてしまうことから、これらの元素の添加量
を１種または２種以上を合計で0.001 〜0.100 ％とし
た。Nb, Ta, W, Mo, Cr: 0.001 to 0.100% Each of Nb, Ta, W, Mo, and Cr is an element capable of forming a carbide, and reduces solid solution C which causes aging deterioration. Is an element that can be In order to obtain the effect, it is necessary to contain one or more kinds in a total amount of 0.001% or more. However, the content of more than 0.100% significantly increases the cost of molten steel. Therefore, the addition amount of one or more of these elements is made 0.001 to 0.100% in total.
【００１７】Se：0.001 〜0.050 ％ Seは主に溶接性を改善する目的から添加するものである
が、その効果を引き出すには0.001 ％以上の添加が必要
であり、また0.050 ％超の添加は表面性状を劣化させる
ことから、その添加量を0.001 〜0.050 ％とした。その
他、不可避的不純物については極力低減する必要がある
が、本発明ではこれらの量を特に規制はしない。Se: 0.001 to 0.050% Se is added mainly for the purpose of improving the weldability, but in order to bring out its effect, 0.001% or more must be added. Since the surface properties are deteriorated, the addition amount is set to 0.001 to 0.050%. In addition, inevitable impurities need to be reduced as much as possible, but in the present invention, these amounts are not particularly limited.
【００１８】また、本発明では製造方法についてとくに
規制するものではないが、以下に本発明の効果を引き出
すのに有効な手段について簡単に説明する。熱延巻取温
度は冷延焼鈍後のプレス成形性を良好ならしめるには 5
00℃以上、好ましくは 600℃以上の温度である。再結晶
焼鈍はとくに箱焼鈍法、連続焼鈍法どちらでも適用可能
であるが、焼鈍温度範囲は再結晶温度〜 900℃とする必
要がある。すなわち、再結晶温度以下の温度では圧延組
織が残り、プレス割れが発生しやすいことからである。
一方、 900℃超の温度では(111) 集合組織がランダム化
し、プレス成形性が著しく劣化してしまうことからであ
る。Although the present invention does not particularly limit the manufacturing method, the following is a brief description of the means effective to bring out the effects of the present invention. The hot rolling coiling temperature is 5 to improve the press formability after cold rolling annealing.
The temperature is at least 00 ° C, preferably at least 600 ° C. The recrystallization annealing is particularly applicable to both the box annealing method and the continuous annealing method, but the annealing temperature range needs to be from the recrystallization temperature to 900 ° C. That is, at a temperature lower than the recrystallization temperature, a rolled structure remains, and press cracking is likely to occur.
On the other hand, if the temperature exceeds 900 ° C., the (111) texture is randomized, and the press formability is significantly deteriorated.
【００１９】[0019]
【実施例】表１に示したような化学組成の連続鋳造スラ
ブを鋳込み方法をかえて製造した。1200℃の加熱炉に３
時間挿入し、粗圧延後、仕上圧延機にて仕上温度 880
℃、板厚3.5mm になるように熱間圧延し、 550〜700 ℃
の範囲内の温度で巻取った。酸洗後、冷間圧延を施して
板厚0.7mm の冷延板とし、 900℃以下の温度で30秒以内
の均熱保持をする短時間焼鈍を行った。圧下率 0.5％の
調質圧延を施した後、JIS ５号引張試験片に加工して圧
延方向に対して０°、45°、90°方向の機械的特性につ
いて調査した。結果は３方向の平均値で示した。また耐
時効性については、〔 7.5％予歪後、 100℃で30分の時
効処理した後の下降伏応力〕−〔 7.5％予歪時の応力〕
を調べ、結果はA.I.として示した。EXAMPLES Continuous cast slabs having the chemical compositions shown in Table 1 were produced by changing the casting method. 3 in heating furnace of 1200 ℃
After inserting for an hour and rough rolling, the finishing temperature is 880
℃, hot-rolled to 3.5mm thickness, 550-700 ℃
At a temperature within the range. After pickling, cold rolling was performed to form a cold-rolled sheet having a thickness of 0.7 mm, and short-time annealing was performed at a temperature of 900 ° C. or less to maintain a uniform temperature within 30 seconds. After temper rolling at a rolling reduction of 0.5%, it was processed into a JIS No. 5 tensile test piece, and the mechanical properties in the 0 °, 45 °, and 90 ° directions with respect to the rolling direction were examined. The results were shown as average values in three directions. Regarding the aging resistance, [falling yield stress after aging treatment at 100 ° C for 30 minutes after 7.5% prestrain]-[stress at 7.5% prestrain]
And the results are shown as AI.
【００２０】ほうろう特性については、アルカリ脱脂
後、20秒酸洗し、市販の下引き釉薬を施釉した後、露点
40℃、 850℃の電気炉に５分間挿入し焼成を行った。そ
の後、160 ℃の恒温槽内に16時間挿入するつまとび欠陥
発生の促進試験を行った。つまとび欠陥発生の有無を目
視で観察し、耐つまとび性を評価した。またほうろう密
着性については同一サンプルをASTM C313−59の試験方
法によって調査した。Regarding the enamel properties, after degreasing with alkali, pickling for 20 seconds, glazing with a commercial undercoat glaze, and dew point
It was inserted into an electric furnace at 40 ° C. and 850 ° C. for 5 minutes and fired. Thereafter, a test for accelerating the generation of toe skipping defects, which was performed by inserting into a thermostat at 160 ° C. for 16 hours, was performed. The presence or absence of the occurrence of a skip defect was visually observed to evaluate the skip resistance. For the enamel adhesion, the same sample was examined by the test method of ASTM C313-59.
【００２１】さらに、溶接性は溶接電流 130Ａ、速度50
cm／min でTIG 溶接を行い、溶接開始から孔あきが発生
するまでの溶接距離で評価した。これらの結果を表２に
示した。その結果、本発明の化学組成を満足した鋼板
は、プレス成形性、耐時効性、耐つまとび性が良好であ
り、かつ溶接性も良好であり、溶接部の仕上がりの形状
も平滑であった。これに対して、本発明外の鋼板は材質
および溶接性に問題が認められた。Further, the weldability is as follows: welding current 130A, speed 50
TIG welding was performed at cm / min, and the welding distance from the start of welding to the occurrence of perforation was evaluated. Table 2 shows the results. As a result, the steel sheet satisfying the chemical composition of the present invention had good press-formability, aging resistance, anti-jumping property, good weldability, and a smooth welded finish. . On the other hand, the steel sheet outside the present invention had problems in the material and weldability.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【発明の効果】本発明によって製造された鋼板は耐時効
性および溶接性が良好であり、この鋼板を使用すること
により、ほうろうメーカーでの溶接条件をロット単位で
変更させる必要性がなくなるばかりでなく、生産性を一
層向上させることも可能となる。The steel sheet manufactured according to the present invention has good aging resistance and good weldability, and the use of this steel sheet eliminates the necessity of changing the welding conditions at the enamel maker in lot units. In addition, productivity can be further improved.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−236254（ＪＰ，Ａ) 特開 平２−235550（ＪＰ，Ａ) 特開 平３−232947（ＪＰ，Ａ) 特開 平３−223441（ＪＰ，Ａ) 特開 平３−166336（ＪＰ，Ａ) 特開 平４−235226（ＪＰ，Ａ) 特開 平３−10048（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 38/00 301 C22C 38/32 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-236254 (JP, A) JP-A-2-235550 (JP, A) JP-A-3-232947 (JP, A) JP-A-3-23647 223441 (JP, A) JP-A-3-166336 (JP, A) JP-A-4-235226 (JP, A) JP-A-3-10048 (JP, A) (58) Fields investigated (Int. 7 , DB name) C22C 38/00 301 C22C 38/32
Claims (2)
２種以上を合計で 0.001％〜0.100 ％を含有し、残部が
鉄および不可避的不純物から成る耐時効性および溶接性
の良好なほうろう用鋼板。1. A by weight ratio, C: 0.0050% or less, Mn: 0.05~1.0%, Al: 0.010% or less, N: 0.00 34% or less, Cu: 0.010 ~0.100%, O : 0.020 ultrasonic 0.100% , B: more than 0.0030 to 0.0200%, V: 0.001 to 0.100%, and further contains one or more of Nb, Ta, W, Mo, and Cr from 0.001% to 0.100% in total, An enameled steel sheet with good balance of aging resistance and weldability, with the balance being iron and unavoidable impurities.
請求項１記載の耐時効性および溶接性の良好なほうろう
用鋼板。2. The enameled steel sheet having good aging resistance and weldability according to claim 1, wherein 0.001 to 0.050% of Se is replaced by the same amount of iron as the balance in weight ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27162592A JP3260446B2 (en) | 1992-10-09 | 1992-10-09 | Enamelled steel sheet with good aging resistance and weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27162592A JP3260446B2 (en) | 1992-10-09 | 1992-10-09 | Enamelled steel sheet with good aging resistance and weldability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06122938A JPH06122938A (en) | 1994-05-06 |
| JP3260446B2 true JP3260446B2 (en) | 2002-02-25 |
Family
ID=17502687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27162592A Expired - Fee Related JP3260446B2 (en) | 1992-10-09 | 1992-10-09 | Enamelled steel sheet with good aging resistance and weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3260446B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4102115B2 (en) | 2002-06-12 | 2008-06-18 | 新日本製鐵株式会社 | Steel plate for enamel excellent in workability, aging property and enamel characteristics and method for producing the same |
| PT1950317E (en) * | 2005-11-09 | 2016-06-03 | Shin Nippon Seitetsu Kk (Nippon Steel Corporation) | Steel sheet for continuous cast enameling with excellent resistance to fishscaling and process for producing the same |
| CN103510011B (en) * | 2012-06-20 | 2015-09-02 | 鞍钢股份有限公司 | A kind of enamel inner container High Strength Steel Plate and manufacture method thereof |
-
1992
- 1992-10-09 JP JP27162592A patent/JP3260446B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06122938A (en) | 1994-05-06 |
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