JPH0633211A - Ultrahigh strength galvanized steel sheet free from generation of hydrogen embrittlement - Google Patents
Ultrahigh strength galvanized steel sheet free from generation of hydrogen embrittlementInfo
- Publication number
- JPH0633211A JPH0633211A JP21357192A JP21357192A JPH0633211A JP H0633211 A JPH0633211 A JP H0633211A JP 21357192 A JP21357192 A JP 21357192A JP 21357192 A JP21357192 A JP 21357192A JP H0633211 A JPH0633211 A JP H0633211A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- hydrogen embrittlement
- plating
- zinc
- generation
- 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- Withdrawn
Links
Landscapes
- Electroplating Methods And Accessories (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車のバンパー、ドア
の補強部材、更には建築用の足場材など、軽量でかつ高
耐食性が要求される用途において好適な超高強度亜鉛め
っき鋼板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-high strength galvanized steel sheet suitable for applications requiring lightweight and high corrosion resistance such as automobile bumpers, door reinforcing members, and construction scaffolding materials. is there.
【０００２】[0002]
【従来の技術】米国のＣＡＦＥ(Ｃorporate Ａverage
Ｆuel Ｅconomy)の規制強化提案により自動車の軽量化
が進み、バンパー、ドアの補強部材などに１１８０Ｎ／
mm2以上の超高強度薄鋼板が採用されるようになってき
た。これらの鋼板は非めっき材で耐食性に問題があり、
最近、その防錆力向上のために亜鉛めっき化が検討され
るようになってきた。2. Description of the Related Art US CAFE (CorporateAverage
FuelEConomy) regulatory tightening proposal to reduce vehicle weight
Has progressed to 1180N / for bumpers, door reinforcements, etc.
mm2The above ultra-high-strength thin steel sheets have come to be adopted.
It was These steel sheets are non-plating materials and have problems with corrosion resistance.
Recently, zinc plating has been studied in order to improve its rust prevention.
It started to come.
【０００３】しかし、このような超高強度鋼板に亜鉛め
っきをすると、例えば、電気亜鉛めっきでは、めっき前
の酸洗及びめっき浴などで陰極反応で発生する水素が鋼
板中に進入、また溶融亜鉛めっきでは、そのラインの加
熱雰囲気中の水素が鋼板中に進入し、いずれにおいても
水素脆化を起こすことが知られている。However, when such ultra-high strength steel sheet is galvanized, for example, in electrogalvanizing, hydrogen generated by cathodic reaction in the pickling and plating bath before plating penetrates into the steel sheet, and hot-dip zinc is also applied. In plating, it is known that hydrogen in the heating atmosphere of the line enters the steel sheet and causes hydrogen embrittlement in any case.
【０００４】このような水素脆化は、遅れ破壊と同様、
引張強さ１１８０Ｎ／mm2以上の強度で発生し易いこと
が知られている。鋼板の水素脆化はこの拡散性水素によ
って生じ、２００℃で数時間加熱することでこの水素が
減少することが報告されている(例えば、「金属表面技
術」Ｖol.３９、Ｎo.７、１９８８、p.５２)。しかしな
がら、このように鋼板を加熱処理しても鋼中の拡散性水
素を完全に排除することは困難であり、水素脆化を防止
できない。また、亜鉛めっき後に鋼板を加熱処理すると
亜鉛めっき層が変質し、目的とした耐食性が得られな
い。Such hydrogen embrittlement is similar to delayed fracture.
It is known that it easily occurs at a tensile strength of 1180 N / mm 2 or more. It has been reported that hydrogen embrittlement of a steel sheet is caused by this diffusible hydrogen, and the hydrogen is reduced by heating at 200 ° C. for several hours (for example, “Metal Surface Technology” Vol. 39, No. 7, 1988). , P.52). However, it is difficult to completely remove diffusible hydrogen in the steel even if the steel sheet is heat-treated in this way, and hydrogen embrittlement cannot be prevented. Further, if the steel sheet is heat-treated after galvanizing, the galvanized layer deteriorates and the desired corrosion resistance cannot be obtained.
【０００５】[0005]
【発明が解決しようとする課題】このように、従来は、
良好な耐食性を有しかつ水素脆化の発生しない引張強さ
１１８０Ｎ／mm2以上の亜鉛系めっき鋼板は存在しなか
った。As described above, the prior art is as follows.
There was no galvanized steel sheet having good corrosion resistance and hydrogen embrittlement with a tensile strength of 1180 N / mm 2 or more.
【０００６】本発明は、上述の現状に鑑みてなされたさ
れたものであって、水素放出のための再加熱処理するこ
となく、所定の亜鉛又は亜鉛系めっきを施したままで水
素脆化が発生しない引張強さ１１８０Ｎ／mm2以上の鋼
板を提供することを目的とするものである。The present invention has been made in view of the above-mentioned present situation, and hydrogen embrittlement is caused without applying a reheating treatment for releasing hydrogen to a prescribed zinc or zinc-based plating. It is an object to provide a steel sheet having a tensile strength of 1180 N / mm 2 or more that does not occur.
【０００７】[0007]
【課題を解決するための手段】前記課題を解決するため
の手段として、本発明は、引張強さ１１８０Ｎ／mm2以
上の超高強度鋼板の片方の表面にのみ純亜鉛又は亜鉛系
めっき層を有することを特徴とするものである。[Means for Solving the Problems] As a means for solving the above problems, the present invention provides a pure zinc or a zinc-based plating layer only on one surface of an ultra high strength steel sheet having a tensile strength of 1180 N / mm 2 or more. It is characterized by having.
【０００８】以下に本発明について更に具体的に説明す
る。The present invention will be described in more detail below.
【０００９】[0009]
【作用】前述のとおり、本発明は、引張強さ１１８０Ｎ
／mm2以上の超高強度鋼板の片方の表面にのみ純亜鉛、
又は亜鉛系めっきを施すことにより、水素脆化の発生を
防止するものである。As described above, the present invention has a tensile strength of 1180N.
/ Mm 2 or more ultra-high strength steel plate with pure zinc on only one surface
Alternatively, by applying zinc-based plating, the occurrence of hydrogen embrittlement is prevented.
【００１０】これは、本発明者が従来法での水素脆化の
発生原因について究明した結果に基づいて開発したもの
である。すなわち、引張強さが１１８０Ｎ／mm2よりも
低い鋼板の場合は、両面に亜鉛めっきを施しても水素脆
化の問題は特に発生しなかった。従来法は、この方法を
踏襲して引張強さ１１８０Ｎ／mm2以上の超高強度鋼板
の両面に亜鉛めっきを施していたため、水素脆化の発生
を防止できなかったことが判明した。This is developed by the present inventor based on the result of investigation on the cause of hydrogen embrittlement in the conventional method. That is, in the case of a steel sheet having a tensile strength of less than 1180 N / mm 2 , the problem of hydrogen embrittlement did not occur even if both surfaces were galvanized. It was found that hydrogen embrittlement could not be prevented in the conventional method, which was based on this method and was galvanized on both surfaces of an ultrahigh strength steel sheet having a tensile strength of 1180 N / mm 2 or more.
【００１１】片面にのみ亜鉛めっき層を付与することに
よって水素脆化の発生が防止できる理由については、必
ずしも明確ではないが、亜鉛めっき層中よりも鋼中の方
が水素の拡散が速いため、非亜鉛めっき面からの鋼中水
素の放出が起こり易く、鋼中の水素濃度が低下すること
によるものと考えられる。The reason why hydrogen embrittlement can be prevented by providing a galvanized layer on only one side is not necessarily clear, but since hydrogen diffuses faster in the steel than in the galvanized layer, It is considered that this is because hydrogen in steel is likely to be released from the non-galvanized surface and the hydrogen concentration in steel is reduced.
【００１２】片面にのみ亜鉛めっき層を付与する方法と
しては、電気亜鉛めっきで片面のみめっきする方法、及
び電気亜鉛めっき又は溶融亜鉛めっき後、機械的に片面
のめっき層を研削し除去する方法などがあるが、特にこ
れらに限定されるものではない。As a method for providing a galvanized layer only on one surface, a method for electrogalvanizing only one surface, and a method for mechanically grinding and removing the galvanized layer on one surface after electrogalvanizing or hot dip galvanizing However, the present invention is not limited to these.
【００１３】また、亜鉛めっきの種類、方法についても
特に限定されるものではない。純亜鉛めっきとしては電
気亜鉛めっき、溶融亜鉛めっきなどがある。また、亜鉛
系めっきとしては、Ｚn−Ｎi、Ｚn−Ｍnなどの電気合金
亜鉛めっき、合金化溶融亜鉛めっきなどがある。これら
の亜鉛めっき鋼板の片面めっき層が単一の層であって
も、２種類以上のめっきからなる複合層であっても、更
に片面めっき層の表面に各種の表面処理、すなわち、ク
ロメート処理又はりん酸塩処理などが施されていても、
本発明の効果は変わらない。Further, the type and method of galvanizing are not particularly limited. Pure zinc plating includes electrogalvanizing and hot dip galvanizing. Examples of the zinc-based plating include zinc alloys such as Zn-Ni and Zn-Mn, and galvannealing alloys. Whether the single-sided plating layer of these galvanized steel sheets is a single layer or a composite layer composed of two or more types of plating, the surface of the single-sided plating layer is further subjected to various surface treatments, that is, chromate treatment or Even if it has been treated with phosphate,
The effect of the present invention does not change.
【００１４】また、被めっき材である鋼板の種類につい
ても特に限定されるものではなく、冷延高強度鋼板であ
っても、熱延高強度鋼板であってもよい。勿論、コイル
であっても、シートであってもよい。The type of the steel sheet to be plated is not particularly limited, either a cold rolled high strength steel sheet or a hot rolled high strength steel sheet may be used. Of course, it may be a coil or a sheet.
【００１５】なお、このような片面亜鉛めっき鋼板をコ
イルに巻き取る場合、めっき面をコイルの内周側にし、
圧縮荷重がかかるようにすると、水素脆化の防止に一層
有利である。When winding such a single-sided galvanized steel sheet around a coil, the plated surface should be on the inner peripheral side of the coil,
Applying a compressive load is more advantageous for preventing hydrogen embrittlement.
【００１６】次に本発明の実施例を示す。Next, examples of the present invention will be described.
【００１７】[0017]
【実施例】原板として、連続焼鈍炉により変態組織強化
した冷延鋼板(１.６mm厚)、及び変態組織強化と析出強
化を活用した熱延鋼板(２４mm厚)を用いて、種々の亜鉛
めっきを施した鋼板について、長さ７０mm、幅１５mmの
試験片にシャー切断し、４点曲げによりコイルと同じ歪
みを付与して大気中室温に１週間保持し、割れの発生を
調べた。原板の種類及び引張強さ、めっきの種類及び付
着量、めっき後の表面処理の有無及び種類、水素脆化発
生の有無などを表１に示す。[Example] As a raw plate, cold-rolled steel sheet (1.6 mm thick) having a transformation structure strengthened by a continuous annealing furnace, and hot-rolled steel sheet (24 mm thickness) utilizing transformation structure strengthening and precipitation strengthening were used, and various zinc plating was performed. With respect to the steel sheet subjected to the above, a shear test piece having a length of 70 mm and a width of 15 mm was shear cut, the same strain as that of the coil was imparted by four-point bending, and the steel plate was kept at room temperature in the air for one week to examine the occurrence of cracks. Table 1 shows the type and tensile strength of the original plate, the type and amount of plating, the presence or absence of surface treatment after plating, the presence or absence of hydrogen embrittlement, and the like.
【００１８】[0018]
【表１】 [Table 1]
【００１９】なお、鋼Ｎo.３〜Ｎo.７、Ｎo.９〜Ｎo.１
０については、めっき後に片面のめっき層を機械的に研
削し除去した。水素脆化は、４点曲げで歪みを付与した
サンプルを塩酸浸漬させて破断の有無により評価した。Steel No. 3 to No. 7 and steel No. 9 to No. 1
Regarding No. 0, the plated layer on one side was mechanically ground and removed after plating. The hydrogen embrittlement was evaluated by immersing a sample in which strain was imparted by four-point bending and immersing it in hydrochloric acid, and whether or not it was broken.
【００２０】表１より明らかなように、鋼Ｎo.１は、強
度が低いため、両面めっきでも水素脆化が発生していな
い。鋼Ｎo.２及びＮo.８は、いずれも従来法によるもの
であり、水素脆化が発生している。一方、鋼Ｎo.３〜Ｎ
o.７、Ｎo.９〜Ｎo.１０は、いずれも本発明例であり、
水素脆化が発生していない。As is clear from Table 1, Steel No. 1 has a low strength, so that hydrogen embrittlement does not occur even in double-sided plating. Steels No. 2 and No. 8 were both produced by the conventional method, and hydrogen embrittlement occurred. On the other hand, steel No. 3 to N
No. 7, No. 9 to No. 10 are all examples of the present invention,
Hydrogen embrittlement has not occurred.
【００２１】[0021]
【発明の効果】以上詳述したように、本発明によれば、
１１８０Ｎ／mm2以上で純亜鉛又は亜鉛系めっきを施し
た鋼板であっても、片面めっき層とすることにより、水
素脆化の発生を防止できる。As described in detail above, according to the present invention,
Even with a steel plate plated with pure zinc or zinc-based plating at 1180 N / mm 2 or more, hydrogen embrittlement can be prevented by forming a single-sided plating layer.
Claims (1)
度鋼板の片方の表面にのみ純亜鉛又は亜鉛系めっき層を
有することを特徴とする水素脆化の発生しない超高強度
亜鉛めっき鋼板。1. An ultra-high-strength galvanized steel sheet having no hydrogen embrittlement, which has a pure zinc or zinc-based plating layer on only one surface of an ultra-high-strength steel sheet having a tensile strength of 1180 N / mm 2 or more. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21357192A JPH0633211A (en) | 1992-07-17 | 1992-07-17 | Ultrahigh strength galvanized steel sheet free from generation of hydrogen embrittlement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21357192A JPH0633211A (en) | 1992-07-17 | 1992-07-17 | Ultrahigh strength galvanized steel sheet free from generation of hydrogen embrittlement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0633211A true JPH0633211A (en) | 1994-02-08 |
Family
ID=16641414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21357192A Withdrawn JPH0633211A (en) | 1992-07-17 | 1992-07-17 | Ultrahigh strength galvanized steel sheet free from generation of hydrogen embrittlement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633211A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130093199A1 (en) * | 2011-10-14 | 2013-04-18 | GM Global Technology Operations LLC | Corrosion-resistant plating system |
-
1992
- 1992-07-17 JP JP21357192A patent/JPH0633211A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130093199A1 (en) * | 2011-10-14 | 2013-04-18 | GM Global Technology Operations LLC | Corrosion-resistant plating system |
| US8871077B2 (en) * | 2011-10-14 | 2014-10-28 | GM Global Technology Operations LLC | Corrosion-resistant plating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19991005 |