강판 및 법랑 제품

• Main Authors: FUKUZATO TETSUJI, KUSUMI KAZUHISA
• Format: Patent
• Language: Korean
• Published: 08.01.2021
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS; 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; TREATMENT OF ALLOYS OR NON-FERROUS METALS

이 강판은, 소정의 화학 조성을 갖고, Ti<(N-0.0003)×3.43 및 C>0.25×Ti+0.129×Nb+0.235×V+0.132×Zr+0.125×Mo+0.0652×W+0.0040을 충족하고, 금속 조직으로서, 페라이트와, 페라이트의 결정립 내에 있는 시멘타이트와, 페라이트의 결정립계에 있는 시멘타이트 및 펄라이트의 1종 또는 2종을 함유하고, 페라이트의 결정립 내에, 입경이 0.3 내지 1.5㎛인 시멘타이트가, 개수 밀도가 1.00×10-1개/㎛2 이하의 범위에서 존재하고, 페라이트의 결정립계에, 긴 직경의 평균값이 0.5 내지 15㎛, 개수 밀도가 5.00×10-4 내지 1.00×10-1개/㎛2의 시멘타이트 및 펄라이트의 1종 또는 2종이 존재하고, BN 중에 함유되는 N 함유량인 [N as BN]과 강 중에 함유되는 B 함유량의 관계가 [N as BN]/(1.27×B)<0.95를 충족한다. This steel plate has a predetermined chemical composition, satisfies the expressions Ti < (N - 0.0003) × 3.43 and C > 0.25 × Ti + 0.129 × Nb + 0.235 × V + 0.132 × Zr + 0.125 × Mo + 0.0652 × W + 0.0040, and contains as the metal structure thereof ferrite, cementite in crystal grains of ferrite, and one or both of cementite and ferrite at crystal grain boundaries of the ferrite, cementite having a grain size of 0.3-1.5 µm being present at a number density in a range of 1.00 × 10-1/µm2 or less in the crystal grains of ferrite, one or both of cementite and pearlite having a major axis average value of 0.5-15 µm being present at a number density of 5.00 × 10-4 to 1.00 × 10-1/µm2 at crystal grain boundaries of the ferrite, and the relationship of the N content [N∙as∙BN] in BN and the B content in the steel satisfying the expression [N∙as∙BN]/(1.27 × B) < 0.95.