PIERCER PLUG

• Main Authors: HIGASHIDA YASUTO, SHIRASAWA NAOYA, HIDAKA YASUYOSHI, MIYAI TATSUYA, WATANABE KOTARO
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2022
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

To provide a piercer plug having a long service life, that is appropriately improved in lubricity without impairing peeling resistance and abrasion resistance.SOLUTION: A piercer plug 1 comprises a plug body 2, and a sprayed coating 3 formed on a surface of the plug body 2. The sprayed coating 3 is divided into three areas being a tip area 31, a rolling area 32, and a bottom area 33. The tip area 31 consists of Fe, O and impurities because abrasion resistance is strongly requested during piercing rolling of a billet. The rolling area 32 consists of Fe, O, W, and impurities because lubricity is strongly requested during piercing rolling. A content of W excluding O in the rolling area 32 is 4.0 wt.% or less. Accordingly, abrasion speed in the rolling area 32 is sufficiently reduced during piercing rolling, and lubricity that is strongly requested in the rolling area 32 can be appropriately improved. As a result thereof, the piercer plug 1 with a long service life can be obtained that is improved in lubricity without impairing the peeling resistance and abrasion resistance.SELECTED DRAWING: Figure 4 【課題】耐剥離性及び耐摩耗性を損なわずに適切に潤滑性を向上させた長寿命のピアサープラグを提供する。【解決手段】ピアサープラグ１は、プラグ本体２と、プラグ本体２の表面に形成された溶射皮膜３とを備える。溶射皮膜３は、先端領域３１、圧延領域３２及び底領域３３の３つの領域に分割される。先端領域３１は、ビレットの穿孔圧延時に耐摩耗性が強く要求されるため、Ｆｅ、Ｏ及び不純物からなる。圧延領域３２は、穿孔圧延時に潤滑性が強く要求されるため、Ｆｅ、Ｏ、Ｗ及び不純物からなる。圧延領域３２におけるＯを除くＷの含有率は４．０重量％以下である。これにより、穿孔圧延時、圧延領域３２の摩耗速度が十分に低下し、圧延領域３２に強く要求される潤滑性を適切に向上できる。その結果、耐剥離性及び耐摩耗性を損なわず適切に潤滑性を向上させた長寿命のピアサープラグ１を得ることができる。【選択図】図４