MACHINE COMPONENT

• Main Authors: LAN WEIMING, OGURA TOMO, ONO KAZUHIKO, SHIBAHARA MASAKAZU, ASADA TAKESHI, YAMASHITA SHOTARO, HONDO YUSUKE, SAIDA KAZUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 19.11.2020
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To suppress occurrence of weld crack in a machine component having a weld zone.SOLUTION: A machine component 1 comprises: a first member 10 made of carbon steel; a second member 20 made of carbon steel; and a weld zone 30 connecting the first member 10 and the second member 20. The weld zone 30 contains 0.02 mass% or more and 0.25 mass% or less of carbon, 0.10 mass% or more and 1.35 mass% or less of silicon, 0.6 mass% or more and 2.25 mass% or less of Mn, and exceeding 0.3 mass% and 2.5 mass% or less of Ti, and the balance composed of iron and inevitable impurity. Phosphorus that is an inevitable impurity is 0.05 mass% or less, sulfur is 0.05 mass% or less. A ratio of a content of Ti relative to a content of carbon exceeds 0.54 and is smaller than 24.4.SELECTED DRAWING: Figure 1 【課題】溶接部を有する機械部品において溶接割れの発生を抑制する。【解決手段】機械部品１は、炭素鋼からなる第１部材１０と、炭素鋼からなる第２部材２０と、第１部材１０と第２部材２０とを接続する溶接部３０と、を備える。溶接部３０は、０．０２質量％以上０．２５質量％以下の炭素と、０．１０質量％以上１．３５質量％以下の珪素と、０．６質量％以上２．２５質量％以下のマンガンと、０．３質量％を超え２．５質量％以下のチタンと、を含有し、残部が鉄および不可避的不純物からなる。不可避的不純物であるリンが０．０５質量％以下、硫黄が０．０５質量％以下である。炭素の含有量に対するチタンの含有量の割合が０．５４を超え２４．４未満である。【選択図】図１