摘要:
A copper/aluminum joined structure having a hot-dip- aluminized steel sheet (1) and, laminated thereon by spot welding, aluminum or an aluminum alloy (2), wherein a plating layer (4) comprises 3 to 12 mass % of Si and 0.5 to 5 mass % of Fe, the area percentage of an Al-Fe binary alloy layer (7) in its joining interface is suppressed to 90 % or less, and a region (9) having no alloy layer appears between an Al-Fe-Si ternary alloy layer (6) being present in a base steel (5)/plating layer (4) interface and the Al-Fe binary alloy layer (7); and the above copper/aluminum joined structure which uses a plated steel sheet (1) having a base steel(5) comprising 0.002 to 0.020 mass % of N and having an N-rich layer containing 3.0 atomic % or more of N formed on its surface contacting with the hot dip aluminizing layer (4). The above copper/aluminum joined structure, particularly, the latter one is inhibited in the extension of the Al-Fe binary alloy layer (7), which is low in strength, and as a result, exhibits improved steel/aluminum joining strength.
摘要:
새로운 스테인레스 강판은 -120 내지 -10의 범위로 제어된 오스테나이트 안정 지수 Md 30 와 30 이상으로 제어된 적층 결함 난이도 지수 SFI를 가지며, Cu 농도가 1.0질량% 이하로 규제된 석출물을 포함함으로써 고용된 Cu의 농도를 1~5질량%로 유지하도록 한다. 스테인레스 강판은 바람직하게 (C+N): 0.06질량% 이하, Si: 2.0질량% 이하, Mn: 5질량% 이하, Cr: 15~20질량%, Ni: 5~9질량%, Cu: 1.0~4.0질량%, Al: 0.003질량% 이하 그리고 S: 0.005질량% 이하를 함유하고, 선택적으로 Y: 0.5질량% 이하, Nb: 0.5질량% 이하, Zr: 0.5질량% 이하, V: 0.5질량% 이하, Mo: 3.0질량% 이하, B: 0.03질량% 이하, REM(희토류금속): 0.02질량% 이하 및 Ca:0.03질량% 이하 중 적어도 한가지를 포함한다. 스테인레스 강판은 다단계 딥 드로잉 또는 압축 변형에 의해 과도하게 가공된 부분에서도 어떠한 균열 없이 목적의 형태로 소성 변형될 수 있다. Md 30 (℃) = 551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo SFI(mJ/m 2 ) = 2.2Ni+6Cu-1.1Cr-13Si-1.2Mn+32
摘要:
PURPOSE: To provide a ferritic stainless steel sheet improved in dimensional accuracy and secondary formability in a press-formed state by controlling particle size and distribution of precipitates, which are dispersed in a steel matrix, and a method of manufacturing thereof. CONSTITUTION: The ferritic stainless steel sheet excellent in press formability and secondary formability has a composition consisting of 0.02 mass % or less of C, 0.8 mass % or less of Si, 1.5 mass % or less of Mn, 0.050 mass % or less of P, 0.01 mass % or less of S, 8.0-35.0 mass % of Cr, 0.05 mass % or less of N, 0.05-0.40 mass % of Ti, 0.10-0.50 mass % of Nb, optionally one or more selected from a group consisting of 0.5 mass % or less of Ni, 3.0 mass % or less of Mo, 2.0 mass % or less of Cu, 0.3 mass % or less of V, 0.3 mass % or less of Zr, 0.3 mass % or less of Al and 0.0100 mass % or less of B, and the balance being Fe except inevitable impurities with a product of (%Tix%N) less than 0.005, wherein the metallurgical structure contains precipitates, excluding TiN, of 0.15 μm or more in particle size distributed at a rate of 5000-50000/mm¬2 in a steel matrix.
摘要:
세퍼레이터 기재에 사용되는 스테인레스 강판은, 강판 표면 전역에 걸쳐서 다수의 미세한 피트(d)가 형성되고, 피트(d)의 둘레 가장자리에 다수의 미세돌기(p)가 늘어선 표면형태를 가지고 있다. 이 표면형태는, 스테인레스 강판을 염화제2철 수용액에 침지하여 교류 전해에칭함으로써 형성된다. 이 세퍼레이터 기재를 연료전지에 편입하면, 카본전극과의 접촉저항이 낮아, 가혹한 부식분위기에 노출되는 조건하에서도 장기간에 걸쳐 높은 발전효율을 유지하는 연료전지가 얻어진다.
摘要:
질량 % 로서, c : 0.10 % 이하, Si : 2.0 % 이하, Mn : 4.0% 이하, P : 0.040 % 이하, S : 0.010 % 이하, Ni : 4.0 % 이하, Cr : 10.0 ∼ 20.0 %, N : 0.12 % 이하, B : 0.0050 초과 ∼ 0.0300 %, O : 0.02 % 이하, Cu : 4.0% 이하를 함유하고, 필요에 따라 0.20 % 이하의 Al, 3% 이하의 Mo, 0.20 % 이하의 REM, 0.20 % 이하의 Y, 0.10 % 이하의 Ca, 0.10 % 이하의 Mg의 1 종 또는 2 종 이상을 함유하며, 나머지가 Fe 및 불가피한 불순물로 된 고강도, 고연성 복상조직(複相組織) 스테인레스강이고, 강대 자체에서 20 vol.%이상 95 vol.%이하이고 평균 입경이 10 μm 이하인 마르텐샤이트상과 나머지가 페라이트상으로 된 복상 조직을 가지며 HV 200 이상인 경도를 가진다.
摘要:
PURPOSE: A Fe-Cr soft magnetic material is provided to improve properties as a magnetic sensor operated in a high-frequency low-magnetic field as well as corrosion resistance and to reduce manufacturing costs. CONSTITUTION: The Fe-Cr soft magnetic material having an electric resistivity not less than 50μm Ωcm and a metallurgical structure composed of ferritic grains at a surface ratio not less than 95% with precipitates of 1μm or less in particle size at a ratio not more than 6x10/mm in number. The Fe-Cr soft magnetic material consists of C up to 0.05 mass%, N up to 0.05 mass%, Si up to 3.0 mass%, Mn up to 1.0 mass%, Ni up to 1.0 mass%, P up to 0.04 mass%, S up to 0.01 mass%, 5.0-20.0 mass% Cr, Al up to 4.0 mass%, 0-3 mass% Mo, 0-0.5 mass% Ti and the balance being Fe except inevitable impurities.
摘要:
PURPOSE: A processed zinc-coated steel sheet remarkably improved in corrosion resistance by generation of a converted layer containing insoluble or scarcely-soluble compounds useful as a barrier for insulation of a steel base from an atmosphere and soluble compounds with a self-repairing faculty for repairing damaged parts of the converted layer is provided. CONSTITUTION: The chemically processed steel sheet excellent in corrosion resistance comprises a steel base coated with a Zn or its alloy plating layer; and a converted layer, which contains both of at least one insoluble or scarcely-soluble metal compound and at least one soluble metal compound, generated on a surface of the Zn or its alloy plating layer, wherein the converted layer is composed of at least one complex compound of Mn and Ti, wherein the complex compound is selected from oxides, phosphates, fluorides and organic acids, the converted layer further contains one or more lubricants, the converted layer further contains one or more of insoluble or soluble phosphates and complex phosphates, the converted layer further contains one or more of organic acid salts, wherein the insoluble or scarcely-soluble metal compound is one or more of oxides and hydroxides of valve metals, and the soluble metal compound is one or more of valve metal fluorides, the valve metal is selected from Ti, Zr, Hf, V, Nb, Ta, Mo and W, the converted layer contains the fluoride at an F/O atomic ratio not less than 1/100, the converted layer further contains one or more of soluble or insoluble phosphates and complex phosphates, and the converted layer further contains one or more of organic acid salts.
摘要:
PURPOSE: To provide a steel sheet for a disk brake having a performance of suppressing the generation of warpage in martensitic stainless steel in which the content of C is reduced and to provide a brake disk using the same. CONSTITUTION: This steel sheet for a disk brake has a chemical composition containing, by mass, 0.05 to 0.15% C,
摘要:
PURPOSE: To provide a coated metallic sheet which does not contain chromium compounds in coating pretreatment and in an undercoating resin and increased in rust preventability and moisture resistance. CONSTITUTION: The surface of a Zn or Al or Zn-Al plated metallic sheet is provided with a non-chromic chemical conversion treated layer containing one or more kinds of fluoroacids such as H2TiF6 so as to be controlled to 0.5 to 500 mg/m2 by the coating weight of fluorine or to 0.1 to 500 mg/m2 by the coating weight of the whole metal, and the surface is provided with an undercoating film layer in which a corrosion inhibitor (A) obtained by bonding calcium ions for suppressing corrosion to porous silica particles by ion exchange is added by 2 to 50 pts.mass to 100 pts.mass of the resin component in the coating film, and further, polyphosphate (B) is added to the coating film resin in such a manner that the ratio between the corrosion inhibitor (A) and the polyphosphate (B) is controlled, by mass, to A/B=60/40 to 5/95, and moreover, the total amount of the corrosion inhibitor (A) and the polyphosphate (B) to be added is controlled to 5 to 150 to 100 pts.mass of the resin.
摘要翻译:目的:提供在涂层预处理和底涂层树脂中不含铬化合物的涂层金属片,并提高防锈性和防潮性。 构成:Zn或Al或Zn-Al镀金属片的表面设置有含有一种或多种氟酸如H 2 TiF 6的非铬化学转化处理层,以便通过以下方式控制为0.5-500mg / m 2 氟的涂层重量或整个金属的涂层重量为0.1〜500mg / m 2,并且表面设置有底涂膜层,其中通过将用于抑制腐蚀的钙离子结合到多孔中而获得的腐蚀抑制剂(A) 通过离子交换的二氧化硅颗粒在涂膜中加入2〜50质量份至100质量%的树脂组分,此外,将多磷酸盐(B)以这样的方式加入到涂膜树脂中, 防腐剂(A)和多磷酸盐(B)的质量控制为A / B = 60/40〜5/95,此外,防腐剂(A)和多磷酸盐(B) 被添加到5至150至100磅/立方米的树脂中。
摘要:
PURPOSE: A high-strength, high-toughness martensitic stainless steel sheet suitable for use in various types of springs, metal gaskets, metal masks, flapper valves, steel belts and the like is provided, a method of inhibiting cold-rolled steel sheet edge cracking during production thereof is provided, and a method of producing the steel sheet is provided. CONSTITUTION: The -strength, high-toughness martensitic stainless steel sheet having a chemical composition comprises, in mass percent, more than 0.03 to 0.15% of C, 0.2 to 2.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S, 2.0 to 5.0% of Ni, 14.0 to 17.0% of Cr, more than 0.03 to 0.10% of N, 0.0010 to 0.0070% of B, and the balance of Fe and unavoidable impurities and having an A value defined by Equation(1) of not less than -1.8: A value=30(C+N)-1.5Si+0.5Mn+Ni-1.3Cr+11.8. The high-strength, high-toughness martensitic stainless steel sheet for metal gaskets comprises, in mass percent, more than 0.03 to 0.15% of C, 0.2 to 2.0% of Si, not more than 1.0% of Mn, not more than 0.06% of P, not more than 0.006% of S, 2.0 to 5.0% of Ni, 14.0 to 17.0% of Cr, more than 0.03 to 0.10% of N, 0.0010 to 0.0070% of B, and the balance of Fe and unavoidable impurities and including not less than 85 vol% martensite phase, a test specimen of which imparted with a nominal tensile strain of 0.1% exhibits a spring bending elastic limit Kb0.1 measured in conformity with JIS H 3130 of not less than 700 N/mm¬2.