JP3463659B2 - Steel treatment method - Google Patents
Steel treatment methodInfo
- Publication number
- JP3463659B2 JP3463659B2 JP2000253870A JP2000253870A JP3463659B2 JP 3463659 B2 JP3463659 B2 JP 3463659B2 JP 2000253870 A JP2000253870 A JP 2000253870A JP 2000253870 A JP2000253870 A JP 2000253870A JP 3463659 B2 JP3463659 B2 JP 3463659B2
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- steel
- surface roughness
- ammonium citrate
- treating
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ｃｒを質量％で
０．５〜５％含有する鋼材（以下、単にＣｒ含有低合金
鋼材、または単に鋼材ともいう）に表面粗さを維持しな
がら表面処理を行う方法に関する。特に、鋼材に化成被
膜を形成する前処理としての表面処理方法に関する。TECHNICAL FIELD The present invention relates to a steel material containing 0.5 to 5% by mass of Cr (hereinafter, also simply referred to as Cr-containing low alloy steel material or simply steel material) while maintaining surface roughness. It relates to a method of performing processing. In particular, it relates to a surface treatment method as a pretreatment for forming a chemical conversion coating on a steel material.
【０００２】[0002]
【従来の技術】例えば、石油の掘削に用いられる油井管
は、カップリングを介して相互に接続されている。すな
わち、管の端部に形成した雄ネジにカップリングの内面
に形成した雌ネジ部を嵌め合わせ、これらのネジを締め
付けることにより、複数の管が接続される。2. Description of the Related Art For example, oil country tubular goods used for oil drilling are connected to each other via a coupling. That is, a plurality of pipes are connected by fitting a male screw formed on the end of the pipe with a female screw formed on the inner surface of the coupling and tightening these screws.
【０００３】ところが、この締め付け時にネジ部に大き
なトルクが働くため、ネジ面にゴーリング（かじり疵）
などの欠陥が生じ易く、管の繰り返し使用回数が低減す
る。また、継手部に腐食が発生すると、十分な気密性お
よび液密性を確保することが困難となる。However, since a large torque acts on the threaded portion during this tightening, galling (galling flaw) occurs on the threaded surface.
Such defects easily occur and the number of times the pipe is repeatedly used is reduced. Further, if corrosion occurs in the joint, it becomes difficult to secure sufficient airtightness and liquid tightness.
【０００４】例えば、特開平１−２１９１７３号公報に
は、ゴーリングを防止する方策として、ネジ部表面にリ
ン酸亜鉛の被膜を形成させる方法やリン酸マンガン被膜
を形成させる方法などが開示されている。For example, Japanese Patent Application Laid-Open No. 1-219173 discloses a method of forming a zinc phosphate coating or a manganese phosphate coating on the screw surface as a measure for preventing galling. .
【０００５】しかし、この方法は、油井管に耐食性を向
上させる目的で１％程度のＣｒを含有する材料を用いる
場合には、ネジ部にリン酸亜鉛被膜を形成することが極
めて困難であるという問題がある。However, according to this method, when a material containing about 1% of Cr is used for the oil country tubular goods for the purpose of improving corrosion resistance, it is extremely difficult to form a zinc phosphate coating on the threaded portion. There's a problem.
【０００６】この対策として、特開平５−１１７８７０
号公報には、予めネジ継手部の表面に表面粗さ２０〜６
０μｍの凹凸を形成する方法を提案している。As a countermeasure against this, Japanese Patent Laid-Open No. 5-117870
Japanese Patent Laid-Open Publication No. 6-83242 discloses that the surface of the threaded joint has a surface roughness of 20 to 6 in advance.
A method of forming unevenness of 0 μm is proposed.
【０００７】[0007]
【発明が解決しようとする課題】しかし、表面粗さが２
０〜６０μｍでは、ネジの寸法公差から外れるおそれが
あることから、さらに表面粗さが小さくてもリン酸塩系
の被膜を安定して形成できる技術が求められていた。However, the surface roughness is 2
If the thickness is 0 to 60 μm, the screw may be out of the dimensional tolerance of the screw. Therefore, there has been a demand for a technique capable of stably forming a phosphate coating even if the surface roughness is small.
【０００８】本発明の目的は、Ｃｒ含有低合金鋼材の表
面粗さがＲｍａｘで０．１〜１０μｍと非常に小さい値
でもリン酸塩系の被膜を安定して形成できる前処理方法
を提供することにある。An object of the present invention is to provide a pretreatment method capable of stably forming a phosphate coating even when the surface roughness of a Cr-containing low alloy steel material is as small as 0.1 to 10 μm in Rmax. Especially.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、下記の知
見を得た。
（Ａ）Ｃｒ含有低合金鋼材の表面をＡＥＳ(Auger Elect
ron Spectroscopy)で表面分析した結果、機械加工後の
表面粗さがＲｍａｘで０．１〜１０μｍの鋼材表面は厚
さが数十Åのスケールで被覆されていることが判明し
た。The present inventors have obtained the following findings. (A) AES (Auger Elect
As a result of surface analysis by ron spectroscopy, it was found that the surface of the steel material having a surface roughness Rmax of 0.1 to 10 μm after machining was covered with a scale of several tens of liters.
【００１０】（Ｂ）この状態で鉱酸、例えば硝酸、塩酸
等でスケールを取り除くと、スケールのみならず、鋼材
そのものをエッチングするため、表面粗さがＲｍａｘで
１０μｍ超となり、機械加工精度を維持できない。(B) If the scale is removed with a mineral acid such as nitric acid or hydrochloric acid in this state, not only the scale but also the steel material itself is etched, so that the surface roughness becomes Rmax of more than 10 μm and the machining accuracy is maintained. Can not.
【００１１】（Ｃ）一方、クエン酸アンモニウムの水溶
液でスケールを取り除くと、機械加工後の表面粗さを維
持できる。
（Ｄ）クエン酸アンモニウムの水溶液でスケールを除く
前に、硬質微粒子を含有する樹脂ブラシで鋼材の表面を
ブラッシングすれば、クエン酸アンモニウムの水溶液に
よるスケ−ル除去率がさらに大きくなる。(C) On the other hand, when the scale is removed with an aqueous solution of ammonium citrate, the surface roughness after machining can be maintained. (D) If the surface of the steel material is brushed with a resin brush containing hard fine particles before the scale is removed with an aqueous solution of ammonium citrate, the scale removal rate by the aqueous solution of ammonium citrate is further increased.
【００１２】（Ｅ）ＴＯＦ−ＳＩＭＳ(Time of Flight
Secondary Ion Mass Spectroscopy)による表面分析によ
り確認したところ、クエン酸アンモニウムの水溶液でス
ケールが破壊されて清浄な金属肌が露出し、その金属肌
表面にはクエン酸の鉄塩或いはクエン酸鉄のアンモニウ
ム塩が形成されていることが確認できた。(E) TOF-SIMS (Time of Flight)
Surface analysis by Secondary Ion Mass Spectroscopy) confirmed that the scale was destroyed by an aqueous solution of ammonium citrate to expose clean metal skin, and the metal skin surface had an iron salt of citric acid or an ammonium salt of iron citrate. It was confirmed that the
【００１３】このクエン酸の鉄塩或いはクエン酸鉄のア
ンモニウム塩が鋼材そのものをエッチングすることを防
止し、スケール除去後の表面粗さをＲｍａｘで０．１〜
１０μｍに維持できることが可能となると推定できる。The iron salt of citric acid or the ammonium salt of iron citrate is prevented from etching the steel material itself, and the surface roughness after scale removal is 0.1 to Rmax.
It can be estimated that it is possible to maintain the thickness at 10 μm.
【００１４】（Ｆ）さらに、上記スケールを除去したＣ
ｒ含有低合金鋼に化成処理を施したところ、良好な化成
被膜が得られた。本発明は、以上の知見に基づいてなさ
れたもので、その要旨は、下記のとおりである。(F) Further, C from which the above scale has been removed
When the r-containing low alloy steel was subjected to chemical conversion treatment, a good chemical conversion coating was obtained. The present invention has been made based on the above findings, and the gist thereof is as follows.
【００１５】(1) Ｃｒを質量％で０．５〜５％含有する
鋼材の表面にクエン酸アンモニウムを含有する液を適用
することで表面処理を行い、前記鋼材の表面粗さをＲｍ
ａｘで０．１〜１０μｍとし、前記表面処理の後に、前
記鋼材の表面に化成被膜を形成することを特徴とする鋼
材の処理方法。(1) A surface treatment is performed by applying a liquid containing ammonium citrate to the surface of a steel material containing 0.5 to 5% by mass of Cr, and the surface roughness of the steel material is Rm.
ax is 0.1 to 10 μm, and after the surface treatment, before
A method for treating a steel material, which comprises forming a chemical conversion coating on the surface of the steel material .
【００１６】（２）前記表面処理を行う前に、硬質微粒
子を含有する樹脂ブラシで前記鋼材の表面をブラッシン
グすることを特徴とする上記（１）に記載の鋼材の処理
方法。(2) The method for treating a steel material according to the above (1), characterized in that the surface of the steel material is brushed with a resin brush containing hard particles before the surface treatment.
【００１７】(3) 前記化成被膜がリン酸塩系の化成被膜
であることを特徴とする上記(1) または(2) に記載の鋼
材の処理方法。 (3) The method for treating steel according to the above (1) or (2) , wherein the chemical conversion coating is a phosphate-based chemical conversion coating.
【００１８】(4) 前記鋼材が油井管継手のネジ継手部で
あることを特徴とする上記(1) 〜(3) のいずれかに記載
の鋼材の処理方法。(4) The method for treating steel according to any one of the above (1) to (3) , wherein the steel is a threaded joint portion of an oil well pipe joint.
【００１９】[0019]
【発明の実施の形態】本発明が適用される鋼材は、Ｃｒ
を質量％（以下、単に％で表す）で０．５〜５％含有す
るＣｒ含有低合金鋼材である。BEST MODE FOR CARRYING OUT THE INVENTION The steel material to which the present invention is applied is Cr
Is a Cr-containing low alloy steel material containing 0.5 to 5% by mass% (hereinafter, simply expressed as%).
【００２０】その他の成分は、特に制限されないが、一
般には、Ｃ：０．２５〜０．３５％、Ｓｉ：０．１５〜
０．３５％、Ｍｎ：０．３５〜０．６０％、Ｐ：０．３
０％以下、Ｓ：０．３０％以下、Ｎｉ：２．５〜３．５
％、Ｍｏ：０．５〜０．７％である。Other components are not particularly limited, but in general, C: 0.25 to 0.35%, Si: 0.15 to
0.35%, Mn: 0.35 to 0.60%, P: 0.3
0% or less, S: 0.30% or less, Ni: 2.5 to 3.5
%, Mo: 0.5 to 0.7%.
【００２１】Ｃｒ含有量を０．５〜５％に限定した理由
は、０．５％未満ではクエン酸アンモニウムと鋼材とが
反応し易く脱スケールが容易に進行するが、鋼材の表面
粗さをＲｍａｘで０．１〜１０μｍとすることが困難で
あるからであり、５％を超えるとクエン酸アンモニウム
と鋼材とがほとんど反応しないため、脱スケールが進行
しないからである。The reason for limiting the Cr content to 0.5 to 5% is that if the content is less than 0.5%, ammonium citrate and the steel material easily react and descaling easily proceeds, but the surface roughness of the steel material is reduced. This is because it is difficult to set the Rmax to 0.1 to 10 μm, and if it exceeds 5%, ammonium citrate and the steel material hardly react with each other, and descaling does not proceed.
【００２２】鋼材の使用部位は、表面粗さがＲｍａｘで
０．１〜１０μｍである例えば油井管継手に設けられる
ネジ継手部等である。鋼材の表面粗さをＲｍａｘで０．
１〜１０μｍとする理由は、０．１未満という高レベル
の平滑性を必要としないからであり、１０μｍを超える
と必要とする機械精度を維持できなくなるからである。The portion where the steel material is used is, for example, a screw joint portion provided in an oil well pipe joint having a surface roughness Rmax of 0.1 to 10 μm. The surface roughness of steel is Rmax of 0.
The reason for setting it to 1 to 10 μm is that a high level of smoothness of less than 0.1 is not required, and if it exceeds 10 μm, the required mechanical accuracy cannot be maintained.
【００２３】化成被膜には、リン酸塩系、蓚酸塩系、弗
化アルミ系、弗化チタン系、亜酸化銅系等があるが、リ
ン酸塩系の化成被膜が好ましい。その理由は、リン酸塩
系の化成被膜は鋼材表面の防錆性と耐ゴーリング性に優
れるからである。The conversion coatings include phosphate-based coatings, oxalate-based coatings, aluminum fluoride-based coatings, titanium fluoride-based coatings, cuprous oxide-based coatings, and the phosphate-based conversion coatings are preferred. The reason is that the phosphate chemical conversion coating is excellent in rust prevention and galling resistance on the steel surface.
【００２４】クエン酸アンモニウムとしては、クエン酸
１アンモニウム、クエン酸水素２アンモニウム、クエン
酸３アンモニウムの１種或いは２種以上のクエン酸アン
モニウムを使用できる。As the ammonium citrate, one or more ammonium citrates such as 1 ammonium citrate, 2 ammonium hydrogen citrate and 3 ammonium citrate can be used.
【００２５】クエン酸アンモニウムの水溶液濃度は、
０．１〜３０％とすることが好ましい。クエン酸アンモ
ニウムの水溶液濃度を０．１％未満とすると、脱スケー
ル時間が１時間以上と極度に長くなるため、０．１％以
上とするのが好ましい。The aqueous solution concentration of ammonium citrate is
It is preferably 0.1 to 30%. When the aqueous solution concentration of ammonium citrate is less than 0.1%, the descaling time becomes extremely long, which is 1 hour or more. Therefore, it is preferably 0.1% or more.
【００２６】また、クエン酸アンモニウムの水溶液濃度
が３０％を超えても、脱スケール時間の短縮効果が飽和
しているため、３０％以下とするのが好ましい。クエン
酸アンモニウムの水溶液温度は、６０〜９５℃が好まし
い。Even if the concentration of ammonium citrate in the aqueous solution exceeds 30%, the effect of shortening the descaling time is saturated, so it is preferably 30% or less. The temperature of the aqueous solution of ammonium citrate is preferably 60 to 95 ° C.
【００２７】６０℃未満では、脱スケール速度が極端に
低下するおそれがあり、９５℃を超えると、脱スケール
速度が極端に上昇し、さらに表面粗さを所定範囲に制御
することが困難となるおそれがある。より好ましくは８
０〜９０℃である。If the temperature is lower than 60 ° C., the descaling rate may be extremely decreased, and if the temperature is higher than 95 ° C., the descaling rate may be extremely increased, and it becomes difficult to control the surface roughness within a predetermined range. There is a risk. More preferably 8
It is 0 to 90 ° C.
【００２８】クエン酸アンモニウム塩を含有する液を鋼
材表面に適用することで表面処理を行う方法は、特に限
定されるものではなく、浸漬法、噴霧法等が適用でき
る。クエン酸アンモニウム塩を含有する液で鋼材の表面
処理を行う前に、必要に応じて鋼材の表面をブラッシン
グする。このときに使用するブラシは、硬質微粒子を含
有する樹脂ブラシが好ましい。The method of performing the surface treatment by applying the liquid containing the ammonium citrate salt to the surface of the steel material is not particularly limited, and a dipping method, a spraying method or the like can be applied. Before the surface treatment of the steel product with the liquid containing the ammonium citrate salt, the surface of the steel product is brushed if necessary. The brush used at this time is preferably a resin brush containing hard particles.
【００２９】この樹脂ブラシは、例えばナイロン製の不
繊布に炭化珪素、アルミナ等の硬質微粒子の砥粒を結合
させた市販のブラシ（例えば、住友スリーエム社製ＣＮ
Ｓホイール）が使用できる。This resin brush is, for example, a commercially available brush (for example, CN manufactured by Sumitomo 3M Limited) in which abrasive grains of hard fine particles such as silicon carbide and alumina are bonded to a non-woven cloth made of nylon.
S wheel) can be used.
【００３０】また、この樹脂ブラシを固定グラインダー
あるいはハンドグラインダーに取り付けて鋼材表面を研
磨するのが好ましい。鋼材の表面を研磨するブラシ径、
回転速度、押し付け力およびブラッシング時間は特に限
定されるものではない。It is preferable that the resin brush is attached to a fixed grinder or a hand grinder to polish the surface of the steel material. Brush diameter for polishing the surface of steel,
The rotation speed, pressing force and brushing time are not particularly limited.
【００３１】しかし、作業性を考慮すれば、例えばハン
ドグラインダーを使用する鋼材の表面研磨作業では鋼材
の直径が７インチ前後の場合、ブラシ径は９０〜１６０
ｍｍ、回転速度は６０００〜１００００回転／分、押し
付け力は１０〜３０Ｎ、ブラッシング時間は１分〜２分
程度が好ましい。However, considering workability, for example, in the surface polishing work of a steel material using a hand grinder, when the diameter of the steel material is about 7 inches, the brush diameter is 90 to 160.
mm, the rotation speed is 6000 to 10,000 rotations / minute, the pressing force is preferably 10 to 30 N, and the brushing time is preferably about 1 minute to 2 minutes.
【００３２】本発明の方法で表面処理された鋼材は、処
理後そのまま化成処理を施しても良く、また水洗を行っ
てから、化成処理を施してもよい。The steel material surface-treated by the method of the present invention may be subjected to chemical conversion treatment as it is after treatment, or may be washed with water and then subjected to chemical conversion treatment.
【００３３】[0033]
【実施例】表１に使用した試験材（厚み５ｍｍ：幅２５
ｍｍ：長さ３０ｍｍ）の組成を示す。[Examples] Test materials used in Table 1 (thickness 5 mm: width 25
mm: length 30 mm).
【００３４】[0034]
【表１】 [Table 1]
【００３５】この試験材を機械加工で、表面粗さをＲｍ
ａｘで５μｍに調整した。表面処理剤には、本発明例は
クエン酸アンモニウムとしてクエン酸水素２アンモニウ
ムの水溶液を使用し、比較例は塩酸または硫酸の水溶液
を使用した。This test material was machined to obtain a surface roughness of Rm.
It was adjusted to 5 μm with ax. As the surface treatment agent, an aqueous solution of diammonium hydrogen citrate as ammonium citrate was used in the examples of the present invention, and an aqueous solution of hydrochloric acid or sulfuric acid was used in the comparative examples.
【００３６】水溶液の濃度は、クエン酸水素２アンモニ
ウム、塩酸および硫酸ともに５、１０、２０質量％とし
て試験を行い、水温８０℃の５００ｍＬ容量の容器に５
分間浸漬し、スケールの除去の有無および表面粗さをＲ
ｍａｘで調べた。Tests were carried out with the concentrations of diammonium hydrogen citrate, hydrochloric acid and sulfuric acid being 5, 10 and 20% by weight, respectively, and the concentration of the aqueous solution was adjusted to 5 mL in a 500 mL capacity container at a water temperature of 80 ° C.
Immerse for a minute to determine whether scale is removed and the surface roughness.
I checked with max.
【００３７】また、本発明例の試験番号４〜６について
は、上記表面処理前に、ブラッシング処理として市販の
ブラシ（住友スリーエム社製ＣＮＳホイール：φ４９ｍ
ｍ×幅１３ｍｍ）をコレットチャック式グラインダーに
装着して回転速度：１００００回転／分、押し付け力：
１０Ｎ、ブラッシング時間：１分間の条件で行った。Regarding the test Nos. 4 to 6 of the present invention example, a commercially available brush (CNS wheel manufactured by Sumitomo 3M: φ49 m) was used as a brushing treatment before the surface treatment.
m × width 13 mm) is mounted on a collet chuck type grinder to rotate at a rotation speed of 10,000 rotations / minute and a pressing force of:
It was performed under the conditions of 10 N and brushing time: 1 minute.
【００３８】スケール除去の有無は、ＴＯＦ−ＳＩＭＳ
で調査し、Ｒｍａｘは触針式の表面粗さ測定器で確認し
た。表２に試験結果を示す。Whether or not the scale is removed is determined by TOF-SIMS.
Rmax was confirmed by a stylus type surface roughness measuring device. Table 2 shows the test results.
【００３９】[0039]
【表２】 [Table 2]
【００４０】なお、表中の表面粗さ評価はＲｍａｘで１
０μｍ以下の試験結果に○を、１０μｍ超の試験結果に
×をそれぞれつけた。また、表面処理評価はスケール除
去率が８０％超の試験結果に◎を、５０％超８０％以下
の試験結果に○を、５０％以下の試験結果に×をそれぞ
れつけた。The surface roughness evaluation in the table is 1 for Rmax.
A test result of 0 μm or less is marked with ◯, and a test result of more than 10 μm is marked with x. In the surface treatment evaluation, ⊚ is given to the test result with a scale removal rate of more than 80%, ◯ is given to the test result of more than 50% and 80% or less, and x is given to the test result of 50% or less.
【００４１】さらに、全体評価では、表面粗さ評価およ
び表面処理評価が○または◎の試験結果に○を、いずれ
かがすくなくとも×の試験結果に×をそれぞれつけた。
表２に示すように、比較例の塩酸水溶液を使用した試験
番号７〜９は、スケール除去は容易に行えるが、Ｒｍａ
ｘが２０μｍ以上となり、表面粗さをＲｍａｘで１０μ
ｍ以下に維持することができなかった。Further, in the overall evaluation, the test results of the surface roughness evaluation and the surface treatment evaluation of ◯ or ⊚ are marked with ◯, and at least the test result of x is marked with x.
As shown in Table 2, in the test numbers 7 to 9 using the hydrochloric acid aqueous solution of Comparative Example, scale removal can be easily performed, but Rma
x is 20 μm or more, and the surface roughness is 10 μ in Rmax.
It could not be maintained below m.
【００４２】比較例の硫酸水溶液を使用した試験番号１
０〜１２は、塩酸水溶液と同様にスケール除去は容易に
行えるが、Ｒｍａｘが１５μｍ以上となり、表面粗さを
Ｒｍａｘで１０μｍ以下に維持することができなかっ
た。Test No. 1 using the sulfuric acid aqueous solution of the comparative example
Similar to the aqueous hydrochloric acid solution, scales 0 to 12 could be easily removed, but Rmax was 15 μm or more, and the surface roughness could not be maintained at 10 μm or less in Rmax.
【００４３】本発明例は、スケール除去を容易に行え、
しかも、表面粗さをＲｍａｘで５〜７μｍに維持するこ
とができた。また、ブラッシング処理をした本発明例の
試験番号４〜６は、試験番号１〜３に比べてさらにスケ
−ル除去率が大きくなることが確認された。The example of the present invention facilitates scale removal,
Moreover, the surface roughness could be maintained at Rmax of 5 to 7 μm. Further, it was confirmed that the test numbers 4 to 6 of the present invention example subjected to the brushing treatment had a larger scale removal rate than the test numbers 1 to 3.
【００４４】さらに、本発明例の表面処理を行った本発
明例の試験番号１〜６の各試験材に、市販のリン酸塩を
定められた濃度に調整して化成処理（温度７５℃で５分
間）を行ったところ、各試験材の表面に１０μｍ以上の
化成被膜を安定して形成できた。Further, each of the test materials of Test Nos. 1 to 6 of the present invention, which had been subjected to the surface treatment of the present invention, was subjected to a chemical conversion treatment (at a temperature of 75.degree. C.) by adjusting commercially available phosphate to a predetermined concentration. After 5 minutes), a chemical conversion coating of 10 μm or more could be stably formed on the surface of each test material.
【００４５】[0045]
【発明の効果】本発明により、Ｃｒを質量％で０．５〜
５％含有する鋼材に表面粗さを維持しながら表面処理を
行うことが可能となり、化成被膜を容易に形成すること
ができる。According to the present invention, Cr is contained in an amount of 0.5 to 0.5% by mass.
The steel material containing 5% can be surface-treated while maintaining the surface roughness, and the chemical conversion coating can be easily formed.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高野 隆寛 和歌山県和歌山市湊1850番地 住友金属 工業株式会社和歌山製鉄所内 (56)参考文献 特開 昭51−90942（ＪＰ，Ａ) 特開 昭58−84978（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23G 1/24 C23C 22/07 C22C 38/00 301 C22C 38/44 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takahiro Takano 1850 Minato Minato, Wakayama, Wakayama Sumitomo Metal Industries, Ltd. Wakayama Works (56) Reference JP-A-51-90942 (JP, A) JP-A-58- 84978 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) C23G 1/24 C23C 22/07 C22C 38/00 301 C22C 38/44
Claims (4)
材の表面にクエン酸アンモニウムを含有する液を適用す
ることで表面処理を行い、前記鋼材の表面粗さをＲｍａ
ｘで０．１〜１０μｍとし、前記表面処理の後に、前記
鋼材の表面に化成被膜を形成することを特徴とする鋼材
の処理方法。1. A surface treatment is performed by applying a liquid containing ammonium citrate to the surface of a steel material containing 0.5 to 5% by mass of Cr, and the surface roughness of the steel material is Rma.
x is 0.1 to 10 μm, and after the surface treatment,
A method for treating steel, which comprises forming a chemical conversion coating on the surface of the steel.
含有する樹脂ブラシで前記鋼材の表面をブラッシングす
ることを特徴とする請求項１に記載の鋼材の処理方法。2. The method for treating a steel material according to claim 1, wherein the surface of the steel material is brushed with a resin brush containing hard particles before the surface treatment.
あることを特徴とする請求項１または２に記載の鋼材の
処理方法。3. A method of treating steel according to claim 1 or 2, wherein the conversion coating is a conversion coating Phosphate.
ることを特徴とする請求項１〜３のいずれかに記載の鋼
材の処理方法。4. A method of treating steel according to any one of claims 1 to 3, wherein the steel is a threaded joint of an oil well pipe joint.
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| CN108505025B (en) * | 2018-07-03 | 2020-05-26 | 湖南金化科技集团有限公司 | Manganese phosphating solution and application thereof |
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