가로등주 소재 적용을 위한 200계 스테인리스강의 용접부 특성 연구 (A Study on the Welds Characteristics of 200 Grade Stainless Steel for Application of Street Pole Material)

서지정보

· 발행기관 : 한국동력기계공학회
· 수록지 정보 : 동력시스템공학회지 / 13권 / 3호 / 33 ~ 39페이지
· 저자명 : 이병우, 김현수, 이도경, 홍성현

초록

The aim of this study is to analyze the welds characteristics of the 205 stainless steel pipe for application of street pole material. The welds corrosion behavior of STS 205 pipe in 0.1 N sulphuric acid solution and 5% NaCl solution at room temperature was studied using both salt spray test and potentiodynamic polarization experiment. The morphology and components of corrosion products on surface of STS 205 pipe welds were investigated using SEM/EDX. The tensile strength and yield strength values of STS 205 plate were 715 MPa and 369 MPa respectively. The microvickers hardness values of STS 205 pipe welds were slightly increased than that of STS 304 pipe welds. Corrosion current density(Icorr.) and critical current density(Icrit.) values of STS 205 pipe welds in 3.5% NaCl solution were 1.89×10-6 A/㎠ and 15.8×10-6 A/㎠. The corrosion resistance of STS 205 pipe welds was similar to its STS 304 pipe welds. The STS 205 and 304 pipe welds passive films were chromium oxide. Especially, the STS 205 pipe welds showed good corrosion resistance in 0.1 N sulphuric acid. This is attributed to the forming of protective chromium oxide on the surface of STS 205 pipe welds.

영어초록

The aim of this study is to analyze the welds characteristics of the 205 stainless steel pipe for application of street pole material. The welds corrosion behavior of STS 205 pipe in 0.1 N sulphuric acid solution and 5% NaCl solution at room temperature was studied using both salt spray test and potentiodynamic polarization experiment. The morphology and components of corrosion products on surface of STS 205 pipe welds were investigated using SEM/EDX. The tensile strength and yield strength values of STS 205 plate were 715 MPa and 369 MPa respectively. The microvickers hardness values of STS 205 pipe welds were slightly increased than that of STS 304 pipe welds. Corrosion current density(Icorr.) and critical current density(Icrit.) values of STS 205 pipe welds in 3.5% NaCl solution were 1.89×10-6 A/㎠ and 15.8×10-6 A/㎠. The corrosion resistance of STS 205 pipe welds was similar to its STS 304 pipe welds. The STS 205 and 304 pipe welds passive films were chromium oxide. Especially, the STS 205 pipe welds showed good corrosion resistance in 0.1 N sulphuric acid. This is attributed to the forming of protective chromium oxide on the surface of STS 205 pipe welds.

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