JP7709191B2 - Press forming method for high tensile steel plate and press formed products made from high tensile steel plate - Google Patents
Press forming method for high tensile steel plate and press formed products made from high tensile steel plateInfo
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Description
本発明は、高張力鋼（ハイテン鋼：ハイテン材：High Tensile Strength Steel：HTSS）のプレス成形方法と、その方法で成形された高張力鋼板製プレス成形品に関する。 The present invention relates to a press forming method for high tensile steel (High Tensile Strength Steel: HTSS) and a press formed product made of high tensile steel sheet formed by this method.
ハイテン鋼は低炭素鋼にクロム（Ｃｒ）、ニッケル（Ｎｉ）、モリブデン（Ｍｏ）などを添加した材料であり、添加する元素の種類によっていくつかの種類がある。ハイテン鋼は通常の鋼と比べて引張強度が高く、板厚を薄くしても強度を確保できることから軽量化ができる。炭素含有量が少ないため溶接時に熱の影響による硬化が少ない。非調質鋼であるため価格も安いといった利点がある。 High-tensile steel is a material made by adding elements such as chromium (Cr), nickel (Ni), and molybdenum (Mo) to low-carbon steel, and there are several types depending on the type of element added. High-tensile steel has a higher tensile strength than regular steel, and since strength can be maintained even when the plate thickness is thin, it can be made lighter. Since it contains less carbon, it is less likely to harden due to the effects of heat during welding. Another advantage is that it is a non-tempered steel, so it is also inexpensive.
近年、地球環境の改善を目指して、国際的に二酸化炭素（ＣＯ２）の削減が求められており、自動車業界に対してもＣＯ２の排出量の削減が求められている。自動車業界のＣＯ２削減に向けた取り組みとして、ハイブリッド車（ＨＡ車）、プラグインハイブリッド車（ＰＨＥＶ車）、電気自動車（ＥＶ車）の開発が進められている。これに伴って、走行距離の向上、燃費向上、操作性等の面から自動車部品には軽量化が求められている。ハイテン鋼はこれら要請に適応する自動車部品材料である。 In recent years, there has been an international call for the reduction of carbon dioxide ( CO2 ) in order to improve the global environment, and the automobile industry is also being asked to reduce its CO2 emissions. As part of the automobile industry's efforts to reduce CO2 emissions, the development of hybrid vehicles (HA vehicles), plug-in hybrid vehicles (PHEV vehicles), and electric vehicles (EV vehicles) is underway. Accordingly, there is a demand for lighter automobile parts in order to improve driving distance, fuel efficiency, operability, etc. High-tensile steel is an automobile part material that meets these demands.
高張力鋼は前記したような利点がある反面、引張強度が強く、硬いためにプレス加工しにくいという難点がある。 While high-tensile steel has the advantages mentioned above, it has the drawback of being difficult to press due to its high tensile strength and hardness.
高張力鋼板には引張強度の異なるものが各種ある。自動車部品用の高張力鋼板には冷間圧延鋼板（SPCC：Steel Plate Cold Commercial ）と熱間圧延鋼板（SPHC：Steel Plate Hot Commercial ）が有り引張強度が270～780ＭＰａのものがある。引張強度の特に高い高張力鋼板は超高張力鋼板（ウルトラハイテン鋼板）と呼ばれている。超高張力鋼板の特定された定義はないが、一般的には引張強度980ＭＰａ以上といわれている。 There are various types of high-tensile steel plates with different tensile strengths. High-tensile steel plates for automotive parts include cold-rolled steel plates (SPCC: Steel Plate Cold Commercial) and hot-rolled steel plates (SPHC: Steel Plate Hot Commercial), with tensile strengths ranging from 270 to 780 MPa. High-tensile steel plates with especially high tensile strength are called ultra-high tensile steel plates. There is no specific definition of ultra-high tensile steel plates, but they are generally said to have a tensile strength of 980 MPa or more.
引張強度が比較的低いSPCC780及びSPHC780以下の高張力鋼板は一般の冷間プレスで成形（加工）できるが、超高張力鋼板は一般の冷間プレス成形では曲げ、穴あけ、絞り等のプレス成形が困難である。曲げ加工の場合はプレス成形品が欠けたり、亀裂が入ったりし易く（破断し易く）、成形除荷時の弾性回復で成形品が戻る（スプリングバックする）こともあるため寸法精度不良が出やすい。孔あけの場合はバリが出やすい。いずれの場合も、金型が摩耗し易く、折損もし易く、金型の寿命が短くなる。このため、引張強度、表面硬度が特に高い超高張力鋼板は熱間プレス成形（ホットスタンプ成形）されていることが多い。 High-tensile steel plates below SPCC780 and SPHC780, which have relatively low tensile strength, can be formed (processed) using ordinary cold presses, but ultra-high tensile steel plates are difficult to press form using ordinary cold presses, such as bending, drilling, and drawing. When bending, the press-formed product is prone to chipping and cracking (easily broken), and the formed product may return to its original shape (spring back) due to elastic recovery when the load is removed from the forming process, which can easily result in poor dimensional accuracy. When drilling holes, burrs are likely to appear. In either case, the mold is prone to wear and breakage, shortening its lifespan. For this reason, ultra-high tensile steel plates, which have particularly high tensile strength and surface hardness, are often hot press formed (hot stamping).
熱間プレス成形では、超高張力鋼板を900℃程度に加熱してからプレス成形し、成形後に急速に冷却して焼き入れしているため、作業工程が多く、作業に手間が掛り、生産スピードが遅く（生産性が低く）、コスト高になるといった難点がある。また、焼き入れ後の成形品は高硬度になるため、プレス成形後のトリミングやピアッシングといった加工がしにくく、レーザー加工が必要になることがある。この場合、レーザー加工設備の導入に伴うイニシャルコスト、その使用に伴うランニングコストが嵩むといった難点もある。 In hot press forming, ultra-high tensile steel plate is heated to around 900°C before being press-formed, and then rapidly cooled and quenched after forming, which has the drawbacks of requiring many work steps, being labor-intensive, slow production speed (low productivity), and high costs. In addition, since the formed product becomes very hard after quenching, processing such as trimming and piercing after press forming is difficult, and laser processing may be required. In this case, there are also drawbacks such as high initial costs associated with introducing laser processing equipment and high running costs associated with its use.
前記難点を解消すべく、金型内で鋼板を直接水冷する方法が開発されている（非特許文献１）。この方法によれば、常温で焼き入れするよりも生産性を３倍に上げることができるとのことである。しかし、この方法はあくまでも熱間プレス成形である。冷間プレス成形で生産性を向上させる方法は本件出願人の知る限りにおいては知られていない。 To solve the above problems, a method of directly water-cooling the steel plate inside the mold has been developed (Non-Patent Document 1). This method is said to be able to increase productivity three times compared to quenching at room temperature. However, this method is still a hot press forming method. As far as the applicant knows, there is no known method of improving productivity in cold press forming.
本発明の解決課題は、引張強度が超高張力鋼板よりも低い高張力鋼板を使用して、引張強度を高めること、好ましくは２倍以上又は超高張力鋼板の引張強度と同程度又はそれ以上に向上させることにある。ここでいう超高張力鋼板の引張強度と同程度とは、一般的に超高張力鋼板といわれている引張強度980ＭＰａ程度をいう（以下において同じ。）。 The problem to be solved by the present invention is to use a high-tensile steel plate with a lower tensile strength than ultra-high tensile steel plate to increase the tensile strength, preferably to at least twice as high, or to the same level as or higher than the tensile strength of ultra-high tensile steel plate. In this case, the same level as the tensile strength of ultra-high tensile steel plate refers to a tensile strength of about 980 MPa, which is generally considered to be ultra-high tensile steel plate (the same applies below).
本発明の高張力鋼板のプレス成形方法は、引張強度が超高張力鋼板よりも低い高張力鋼板を、冷間プレス成形し、成形されたプレス成形品を浸炭処理又は浸炭窒化処理して、プレス成形品の少なくとも引張強度を、浸炭処理又は浸炭窒化処理前の引張強度の２倍以上好ましくは超高張力鋼板の引張強度と同程度又はそれ以上に向上させることを特徴とするプレス成形方法である。ここでいう、浸炭処理又は浸炭窒化処理とは汎用の各種浸炭処理又は浸炭窒化処理をいう（以下において同じ。）。 The press forming method of the present invention for high tensile steel plate is characterized in that a high tensile steel plate having a lower tensile strength than an ultra-high tensile steel plate is cold press formed, and the formed press-formed product is carburized or carbonitrided to improve the tensile strength of the press-formed product to at least twice the tensile strength before the carburized or carbonitrided treatment, and preferably to the same level as or higher than the tensile strength of the ultra-high tensile steel plate. The carburized or carbonitrided treatment referred to here refers to various general-purpose carburized or carbonitrided treatments (the same applies below).
本発明の高張力鋼板製プレス成形品は、高張力鋼板を本発明のプレス成形方法により成形したプレス成形品であり、浸炭処理又は浸炭窒化処理して、それら処理前の引張強度の２倍以上好ましくは超高張力鋼板の引張強度と同程度又はそれ以上の引張強度を備えたものである。 The press-formed product made of high-tensile steel plate of the present invention is a press-formed product formed by forming a high-tensile steel plate by the press forming method of the present invention, and is carburized or carbonitrided to have a tensile strength at least twice the tensile strength before the treatment, and preferably equal to or greater than the tensile strength of an ultra-high-tensile steel plate.
本発明の高張力鋼板のプレス成形方法は、超高張力鋼板よりも引張強度が低い高張力鋼板を使用するので、冷間プレス成形でも容易に成形でき、熱間プレス成形に比して成形作業が容易であり、生産性が向上するので、コスト低減が可能となる。プレス成形による欠けや亀裂が少なく、寸法精度の高い成形を行うことができる。トリミングなどの後加工をプレス成形で行うことができるので、レーザー加工機を導入する必要がなく、イニシャルコスト、ランニングコストの嵩みもない。金型の摩耗、損傷も少ない。焼き入れ、焼き戻し等の工程を必要としないので生産性が向上し、コストも低減する。 The press forming method of high tensile steel plate of the present invention uses a high tensile steel plate with a lower tensile strength than an ultra-high tensile steel plate, so it can be easily formed even by cold press forming, and the forming work is easier than hot press forming, improving productivity and enabling cost reduction. There are fewer chips and cracks due to press forming, and forming with high dimensional accuracy can be performed. Since post-processing such as trimming can be performed by press forming, there is no need to introduce a laser processing machine, and there is no increase in initial costs and running costs. There is also less wear and damage to the mold. Since processes such as quenching and tempering are not required, productivity is improved and costs are reduced.
本発明の高張力鋼板製プレス成形品は、高張力鋼板であっても、少なくとも引張強度が浸炭処理又浸炭窒化処理前の引張強度の２倍以上又は超高張力鋼板の引張強度と同程度又はそれ以上であるため、欠けや亀裂がなく、寸法精度が高く、トリミング、その他の後加工が容易である。板厚が薄くても前記引張強度を維持できるので軽量になる。 The press-formed product made of high-tensile steel plate of the present invention has a tensile strength that is at least twice the tensile strength before carburizing or carbonitriding, or is equal to or greater than the tensile strength of ultra-high-tensile steel plate, so it is free of chips and cracks, has high dimensional accuracy, and is easy to trim and perform other post-processing. Even if the plate is thin, the tensile strength can be maintained, making it lightweight.
（高張力鋼板のプレス成形方法の実施形態）
本発明の高張力鋼板のプレス成形方法は、超高張力鋼板よりも引張強度が低い高張力鋼板を冷間プレス成形し、プレス成形品を浸炭処理（浸炭焼き入れ）又は浸炭窒化処理（浸炭窒化焼き入れ）して、引張強度を前記処理前の引張強度の２倍以上又は超高張力鋼板の引張強度と同程度又はそれ以上にする方法である。
(Embodiment of press forming method for high tensile steel sheet)
The method for press forming a high tensile steel plate of the present invention is a method in which a high tensile steel plate having a lower tensile strength than an ultra-high tensile steel plate is cold press formed, and the press-formed product is carburized (carburizing and quenching) or carbonitrided (carbonitriding and quenching) to have a tensile strength that is at least twice the tensile strength before the treatment or is equal to or greater than the tensile strength of the ultra-high tensile steel plate.
［浸炭処理］
浸炭処理は汎用の浸炭処理であり、プレス成形品の表面に炭素を拡散浸透させ、その後に、焼き入れ、焼き戻しを行って、プレス成形品の引張強度を向上させる方法である。この場合、焼き入れによりプレス成形品の表面硬度も向上する。
[Carburizing treatment]
Carburizing is a general-purpose carburizing process in which carbon is diffused and infiltrated into the surface of a press-formed product, and then the product is quenched and tempered to improve the tensile strength of the product. In this case, the surface hardness of the press-formed product is also improved by quenching.
［浸炭窒化処理］
浸炭窒化処理は汎用の浸炭窒化処理であり、プレス成形品の表面に炭素と窒素を同時に拡散浸透させ、その後に、焼き入れ、焼き戻しを行って、プレス成形品の引張強度を向上させる方法である。この場合も、焼き入れによりプレス成形品の表面硬度も向上する。
[Carbonitriding treatment]
Carbonitriding is a general-purpose carbonitriding process in which carbon and nitrogen are simultaneously diffused and infiltrated into the surface of a press-formed product, and then the product is quenched and tempered to improve the tensile strength of the product. In this case, the surface hardness of the press-formed product is also improved by quenching.
浸炭処理、浸炭窒化処理のいずれの場合も、固体浸炭、液体浸炭、滴下式浸炭、ガス浸炭、真空浸炭、プラズマ浸炭等の各種浸炭処理があるが、本発明における浸炭処理、浸炭窒化処理はこれらいずれの浸炭処理、浸炭窒化処理であってもよく、可能であれば他の条件での浸炭処理、浸炭窒化処理であってもよい。 In both carburizing and carbonitriding, there are various types of carburizing, such as solid carburizing, liquid carburizing, drop carburizing, gas carburizing, vacuum carburizing, and plasma carburizing, but the carburizing and carbonitriding processes in this invention may be any of these carburizing and carbonitriding processes, or may be carburizing and carbonitriding processes under other conditions if possible.
本発明では、浸炭処理による炭素の拡散浸透の深さ（浸炭深さ）、浸炭窒化処理による炭素及び窒素の拡散浸透の深さ（浸炭窒化深さ）、引張強度等はプレス成形品の用途、プレス成形品に要求される仕様に応じて設定する。表面硬度も同様とすることができる。 In the present invention, the depth of diffusion and penetration of carbon by carburizing (carburizing depth), the depth of diffusion and penetration of carbon and nitrogen by carbonitriding (carbonitriding depth), tensile strength, etc. are set according to the application of the press-molded product and the specifications required for the press-molded product. The same can be done for surface hardness.
自動車、工作機械、各種産業用機器の部品、特に、自動車部品には、軽量化、強靭性等の面から、高張力鋼板を材料とした部品が要求される。本発明の高張力鋼板のプレス成形方法は、板厚を薄くしても、引張強度を超高張力鋼板の引張強度と同等又はそれ以上とすることができるので、自動車部品のプレス成形に特に好適である。 Automobiles, machine tools, and various industrial equipment parts, especially automobile parts, require parts made from high tensile steel plate for their light weight and toughness. The press forming method for high tensile steel plate of the present invention is particularly suitable for press forming of automobile parts because it can achieve a tensile strength equal to or greater than that of ultra-high tensile steel plate even when the plate thickness is thin.
（本発明における浸炭窒化処理と高張力鋼板製プレス成形品の実施形態）
板厚２ｍｍのSPHC270の高張力鋼板と、板厚２ｍｍのSPHC590の高張力鋼板の夫々を、冷間プレス成形で自動車部品を成形し、成形したプレス成形品１に汎用の浸炭窒化装置を使用して、本発明における浸炭窒化方法で浸炭窒化処理を行って、プレス成形品１の表裏両面から板厚方向に炭素及び窒素を浸透させた（図１）。
(Embodiments of the carbonitriding treatment and press-formed products made of high-tensile steel sheets according to the present invention)
Automobile parts were formed by cold press forming of high tensile steel plates, SPHC270 and SPHC590, each having a thickness of 2 mm. The press-formed products 1 thus formed were subjected to carbonitriding treatment by the carbonitriding method of the present invention using a general-purpose carbonitriding device, so that carbon and nitrogen were penetrated into the press-formed products 1 from both the front and back sides in the plate thickness direction (FIG. 1).
［本発明における浸炭窒化方法］
本発明における浸炭窒化方法の一例を図２に示す。図２の実施形態では、880℃で30分パージ、130分浸炭、その後に15分で840℃になるまで焼き入れし、60℃で油焼き入れ（OQ：OIL Quench）し、その後に180℃で90分焼き戻しを行ってから、空気冷却（AC）した。15分で840℃になるまで焼き入れしたのは、プレス成形品の歪発生を防止するためである。この実施形態（図２）では拡散は行っていないが、本発明における浸炭窒化処理では、必要に応じて拡散を行うことができ、その温度、時間等は、浸炭窒化処理の目的に応じて任意に設定可能である。前記浸炭窒化処理により得られたSPHC270のプレス成形品とSPHC590のプレス成形品は次のような特性を備えた。
[Carbonitriding method according to the present invention]
An example of the carbonitriding method of the present invention is shown in FIG. 2. In the embodiment of FIG. 2, the material was purged at 880°C for 30 minutes, carburized for 130 minutes, quenched to 840°C in 15 minutes, oil quenched (OQ: OIL Quench) at 60°C, tempered at 180°C for 90 minutes, and then air cooled (AC). The reason for quenching to 840°C in 15 minutes is to prevent distortion of the press-formed product. Although no diffusion is performed in this embodiment (FIG. 2), the carbonitriding treatment of the present invention can perform diffusion as necessary, and the temperature, time, etc. can be set arbitrarily according to the purpose of the carbonitriding treatment. The press-formed product of SPHC270 and the press-formed product of SPHC590 obtained by the carbonitriding treatment had the following characteristics.
［浸炭深さ、表面硬度］
浸炭深さ、表面硬度は表１のとおりであった。表面硬度については浸炭窒化処理したプレス成形品の３箇所を測定した。３箇所の表面硬度は大差なく、略均一であった。
[Carburization depth, surface hardness]
The carburized depth and surface hardness are shown in Table 1. The surface hardness was measured at three points on the press-formed product that had been carbonitrided. There was no significant difference in the surface hardness at the three points, and the hardness was approximately uniform.
［硬度分布］
浸炭窒化処理後の硬度分布（高張力鋼板の表面からの深さ方向の硬度分布）、芯部硬度は表２のとおりであった。
[Hardness distribution]
The hardness distribution (hardness distribution in the depth direction from the surface of the high tensile steel plate) and core hardness after carbonitriding treatment were as shown in Table 2.
芯部硬度は浸炭窒化後の硬度であるが、本発明における浸炭窒化処理では、炭素、窒素が芯部２（図１）まで浸透しないので、浸炭窒化処理前と同じ（ほとんど同じ）である。
The core hardness is the hardness after carbonitriding, but in the carbonitriding treatment of the present invention, carbon and nitrogen do not penetrate to the core 2 (FIG. 1), so it is the same (almost the same) as before the carbonitriding treatment.
浸炭窒化処理後の引張強度は表３のとおりであった。
表３より、高張力鋼板SPHC270のプレス成形品、高張力鋼板SPHC590のプレス成形品のいずれも、浸炭窒化処理後の引張強度は浸炭窒化処理前の２～３倍以上になった。特に、高張力鋼板SPHC590では1227～1320ＭＰａとなり、超高張力鋼板の引張強度と同程度又はそれ以上となった。 As can be seen from Table 3, the tensile strength of both the press-formed products made from high-tensile steel plate SPHC270 and the press-formed products made from high-tensile steel plate SPHC590 after carbonitriding was 2 to 3 times that of the products before carbonitriding. In particular, the tensile strength of the high-tensile steel plate SPHC590 was 1227 to 1320 MPa, which was equal to or greater than the tensile strength of ultra-high-tensile steel plate.
［浸炭処理］
本発明者らは、浸炭処理については実験を行っていないが、浸炭処理は、基本的には、浸炭窒化処理と同じであり、異なるのは、窒素浸透の有無であるため、処理後の引張強度、表面硬度、硬度分布等は浸炭窒化の場合と略同程度の効果が得られる。
[Carburizing treatment]
Although the inventors have not conducted any experiments on carburizing treatment, carburizing treatment is basically the same as carbonitriding treatment, with the difference being the presence or absence of nitrogen penetration, and therefore the tensile strength, surface hardness, hardness distribution, etc. after treatment have approximately the same effects as in the case of carbonitriding.
前記実施形態はあくまでも本発明の一例である。本発明は前記実施形態に限定されるものではなく、浸炭処理する高張力鋼板の板厚、プレス成形品に要求される仕様、その他の条件に合わせて、浸炭処理又は浸炭窒化処理の環境、条件、それら処理に使用する装置等は変えることができる。 The above embodiment is merely one example of the present invention. The present invention is not limited to the above embodiment, and the carburizing or carbonitriding treatment environment, conditions, and equipment used for these treatments can be changed according to the plate thickness of the high tensile steel plate to be carburized, the specifications required for the press-formed product, and other conditions.
本発明の高張力鋼板のプレス成形方法は自動車部品に限らず、工作機械、各種産業用機器等の金属部品の成形にも利用できる。 The press forming method for high tensile steel sheets of the present invention can be used not only for automotive parts, but also for forming metal parts for machine tools, various industrial equipment, etc.
１ プレス成形品
２ 芯部
1 Press-molded product 2 Core
Claims (10)
ことを特徴とする高張力鋼板のプレス成形方法。 A high-tensile steel plate having a lower tensile strength than an ultra-high-tensile steel plate is cold-pressed, and the press-formed product is carburized or carbonitrided so that the carburizing does not penetrate to the core in the thickness direction , thereby adding to the press-formed product a tensile strength at least twice the tensile strength before the carburizing or carbonitriding treatment.
A press forming method for high tensile steel sheet, comprising:
ことを特徴とする高張力鋼板のプレス成形方法。A press forming method for high tensile steel sheet, comprising:
ことを特徴とする高張力鋼板のプレス成形方法。 A high-tensile steel plate having a lower tensile strength than an ultra-high-tensile steel plate is cold-pressed, and the press-formed product is carburized or carbonitrided so as not to penetrate to the core in the thickness direction , thereby adding to the press-formed product a tensile strength at least twice the tensile strength before the carburization or carbonitriding treatment, and adding to the press-formed product a surface hardness equal to or greater than the surface hardness before the carburization or carbonitriding treatment.
A press forming method for high tensile steel sheet, comprising:
ことを特徴とする高張力鋼板のプレス成形方法。A press forming method for high tensile steel sheet, comprising:
浸炭処理又は浸炭窒化処理後のプレス成形品が、浸炭処理又は浸炭窒化処理前の引張強度の２倍以上の引張強度を備えた、
ことを特徴とする高張力鋼板製プレス成形品。 A press-formed product made of a high-tensile steel plate formed by the press-forming method for a high-tensile steel plate according to claim 1,
The press-formed product after carburizing or carbonitriding has a tensile strength that is at least twice as high as the tensile strength before carburizing or carbonitriding.
A press-formed product made of high-tensile steel plate.
浸炭処理又は浸炭窒化処理後のプレス成形品が、超高張力鋼板の引張強度と同程度又はそれ以上の引張強度を備えた、
ことを特徴とする高張力鋼板製プレス成形品。 A press-formed product made of a high-tensile steel plate formed by the press-forming method of a high-tensile steel plate according to claim 2,
The press-formed product after carburizing or carbonitriding has a tensile strength equal to or greater than that of ultra-high tensile steel plate.
A press-formed product made of high-tensile steel plate.
浸炭処理又は浸炭窒化処理後のプレス成形品が、浸炭処理又は浸炭窒化処理前の引張強度の２倍以上の引張強度を備え、浸炭処理又は浸炭窒化処理前の表面硬度と同程度又はそれ以上の表面硬度を備えた、
ことを特徴とする高張力鋼板製プレス成形品。 A press-formed product made of a high-tensile steel plate formed by the press-forming method of a high-tensile steel plate according to claim 3 ,
The press-formed product after carburizing or carbonitriding has a tensile strength that is at least twice the tensile strength before carburizing or carbonitriding, and has a surface hardness that is equal to or greater than the surface hardness before carburizing or carbonitriding.
A press-formed product made of high-tensile steel plate.
浸炭処理又は浸炭窒化処理後のプレス成形品が、超高張力鋼板の引張強度と同程度又はそれ以上の引張強度を備え、浸炭処理又は浸炭窒化処理前の表面硬度と同程度又はそれ以上の表面硬度を備えた、The press-formed product after carburizing or carbonitriding has a tensile strength equal to or greater than that of ultra-high tensile steel plate, and a surface hardness equal to or greater than that before carburizing or carbonitriding.
ことを特徴とする高張力鋼板製プレス成形品。A press-formed product made of high-tensile steel plate.
浸炭処理又は浸炭窒化処理後のプレス成形品の芯部はそれら処理がなされておらず、芯部硬度が浸炭処理又は浸炭窒化処理前の芯部硬度と同じ又はほとんど同じである、The core of the press-formed product after the carburizing or carbonitriding treatment is not subjected to these treatments, and the core hardness is the same or almost the same as the core hardness before the carburizing or carbonitriding treatment.
ことを特徴とする高張力鋼板製プレス成形品。A press-formed product made of high-tensile steel plate.
浸炭処理又は浸炭窒化処理後のプレス成形品の芯部はそれら処理がなされておらず、表面又は裏面側から芯部側への硬度分布が芯部側になるにつれて低くなって、浸炭処理又は浸炭窒化処理前の芯部硬度と同じ又はほとんど同じである、The core of the press-formed product after carburizing or carbonitriding is not subjected to these treatments, and the hardness distribution from the front or back side to the core side becomes lower toward the core side, and is the same or almost the same as the core hardness before carburizing or carbonitriding.
ことを特徴とする高張力鋼板製プレス成形品。A press-formed product made of high-tensile steel plate.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005146354A (en) | 2003-11-17 | 2005-06-09 | Nippon Steel Corp | Collision-reinforcing parts with high energy absorption during high-speed bending deformation |
| JP2006274357A (en) | 2005-03-29 | 2006-10-12 | Mazda Motor Corp | PRESS-FORMED MEMBER, ITS MANUFACTURING METHOD, AND VEHICLE FRAME |
| JP2006334642A (en) | 2005-06-02 | 2006-12-14 | Mazda Motor Corp | Manufacturing method of steel plate joining member |
| JP2012052642A (en) | 2010-09-03 | 2012-03-15 | Nsk Ltd | Retainer for rolling bearing |
| WO2012108460A1 (en) | 2011-02-10 | 2012-08-16 | 新日本製鐵株式会社 | Steel for carburizing, carburized steel component, and method for producing same |
| JP2012241887A (en) | 2011-05-24 | 2012-12-10 | Aisin Aw Co Ltd | Drive plate and manufacturing method for the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11335808A (en) * | 1998-05-22 | 1999-12-07 | Daihatsu Motor Co Ltd | Carburization of steel sheet-formed article, carburization of bent-formed article and steel sheet-formed article |
-
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- 2021-07-09 JP JP2021114205A patent/JP7709191B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005146354A (en) | 2003-11-17 | 2005-06-09 | Nippon Steel Corp | Collision-reinforcing parts with high energy absorption during high-speed bending deformation |
| JP2006274357A (en) | 2005-03-29 | 2006-10-12 | Mazda Motor Corp | PRESS-FORMED MEMBER, ITS MANUFACTURING METHOD, AND VEHICLE FRAME |
| JP2006334642A (en) | 2005-06-02 | 2006-12-14 | Mazda Motor Corp | Manufacturing method of steel plate joining member |
| JP2012052642A (en) | 2010-09-03 | 2012-03-15 | Nsk Ltd | Retainer for rolling bearing |
| WO2012108460A1 (en) | 2011-02-10 | 2012-08-16 | 新日本製鐵株式会社 | Steel for carburizing, carburized steel component, and method for producing same |
| JP2012241887A (en) | 2011-05-24 | 2012-12-10 | Aisin Aw Co Ltd | Drive plate and manufacturing method for the same |
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