핫 스탬프용 강판, 핫 스탬프용 강판의 제조 방법, 및 핫 스탬프 성형체

• Main Authors: KIKUCHI SHOTA, SENGOKU AKIHIRO, AZUMA MASAFUMI
• Format: Patent
• Language: Korean
• Published: 31.07.2024
• Subjects: ALLOYS; 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; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

이 핫 스탬프용 강판은, 소정의 화학 조성을 갖는 모재 강판과 상기 모재 강판의 표면에 형성된 아연계 도금층을 갖고, 상기 모재 강판의 표면으로부터 판 두께 방향으로 판 두께의 1/8 내지 3/8의 범위인 1/4 깊이 위치의 마이크로 조직이, 체적률로, 페라이트: 20 내지 95％, 펄라이트: 5 내지 80％를 함유하고, 잔부 조직이 베이나이트로 이루어지고, 상기 아연계 도금층의, 단위 면적당 중량이 90g/m2 이상이고, 상기 아연계 도금층 중의 B 함유량의 최댓값을 Bps로 하고, 상기 모재 강판의 상기 1/4 깊이 위치에서의 B 함유량을 Bqs로 했을 때, Bps가 Bqs의 1.2배 이상이다. A steel sheet for hot stamping which has a base material steel sheet having a prescribed chemical composition and a zinc plating layer formed on the surface of the base material steel sheet, wherein: the microstructure at a 1/4-depth position within the range of 1/8-3/8 of the plate thickness from the surface of the base material steel sheet in the plate thickness direction contains ferrite in the amount of 20-95% by volume and pearlite in the amount of 5-80% by volume; the remaining structure comprises bainite; the basis weight of the zinc plating layer is 90g/m2 or higher; and Bps is at least 1.2 times Bqs, if Bps is the maximum value of the B content in the zinc plating layer and Bqs is the B content at the 1/4-depth position in the base material steel sheet.