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Chiba, Japan

Nippon Steel & Sumitomo Metal Corporation , was formed in 2012 with the merger of Nippon Steel and Sumitomo Metal. Nippon Steel was formed in 1970 with the merger of Fuji Iron & Steel and Yawata Iron & Steel. Nippon Steel & Sumitomo Metal Corporation is the world's 2nd largest steel producer by volume as of 2012. Wikipedia.


Uno T.,Nippon Steel & Sumitomo Metal Corporation
Microelectronics Reliability | Year: 2011

There is growing interest in Cu wire bonding for LSI interconnection due to the cost savings and better electrical and mechanical properties. However, the scope of use for Cu bonding wires is generally severely limited compared to Au wires; e.g. for wire oxidation, lower bondability, forming gas of N2 + 5%H2, and lower reliability. It is difficult for conventional bare Cu wires to achieve the target of LSI application. A coated Cu wire (EX1) has thus been developed. It is a Pd-coated Cu wire and has many advantages compared to bare Cu wires. Its stitch strength was far superior under fresh conditions and remained constant without any deterioration after being stored in air for a prolonged period. EX1 had a lifetime of over 90 days in air, as compared to just 7 days for bare Cu wire. Spherical balls were formed with pure N2 (hydrogen-free), whereas the bare Cu produced off-center balls. Finally, the cost-effective and secure gas, pure N2 was only available for EX1. The excellent performance of the EX1 coated Cu wire is comparable to that of Au wires, making it suitable for LSI packaging. © 2010 Elsevier Ltd. All rights reserved.


Uno T.,Nippon Steel & Sumitomo Metal Corporation
Microelectronics Reliability | Year: 2011

There is growing interest in Cu wire bonding for LSI interconnection due to cost savings and better electrical and mechanical properties. Conventional bare Cu bonding wires, in general, are severely limited in their use compared to Au wires. A coated Cu bonding wire (EX1) has been developed for LSI application. EX1 is a Pd-coated Cu wire to enhance the bondability. Bond reliability at a Cu wire bond under a humid environment is a major concern in replacing Au wires. The bond reliability of EX1 and bare Cu was compared in the reliability testing of PCT and UHAST (Unbiased HAST). The lifetimes for EX1 and the bare Cu in PCT testing were over 800 h and 250 h, respectively. Humidity reliability was significantly greater for EX1. Continuous cracking was formed at the bond interface for the bare Cu wire. Corrosion-induced deterioration would be the root cause of failure for bare Cu wires. The corrosion was a chemical reaction of Cu-Al IMC (InterMetallic Compound) and halogens (Cl, Br) from molding resins. EX1 improves the bond reliability by controlling diffusion and IMC formation at the bond interface. The excellent humidity reliability of the coated Cu wire, EX1 is suitable for LSI application. © 2010 Elsevier Ltd. All rights reserved.


Sawada H.,Nippon Steel & Sumitomo Metal Corporation
Computational Materials Science | Year: 2012

Grain boundary embrittlement due to grain boundary co-segregation of Ni and S atoms in face-centered cubic iron is examined for the (2 2̄ 1)Σ9[1 1 0] grain boundary by first-principles calculation. The phenomenon whereby the addition of Ni accelerates grain boundary embrittlement is reproduced for different concentrations of S at the grain boundary. With low concentrations of S, the cohesive energy of the grain boundary is reduced by Ni addition, while Ni addition leads to a steep reduction in binding energy as grain boundary separation increases with high concentrations of S. The mechanism of the embrittlement is related to repulsive interaction between S atoms induced by occupation of anti-bonding states between S atoms. © 2011 Elsevier B.V. All rights reserved.


Kondo H.,Nippon Steel & Sumitomo Metal Corporation
Spectrochimica Acta - Part B Atomic Spectroscopy | Year: 2012

Plasma characteristics, excitation temperatures of atomic iron and electron number densities, were compared between the laser-induced plasmas generated on solid steel at room temperature and molten steel. The excitation temperatures of iron atom were determined by Boltzmann plot using neutral iron atomic emission lines in the wavelength range of 386 to 400 nm. Electron number densities were estimated by measured linewidths of AlI394.4 nm. Excitation temperature of iron decreased from 10,800 K at 10 μs to 7300 K at 80 μs of delays for solid steel. Significant difference in the excitation temperatures of iron atom wasn't exhibited between the plasmas generated on solid and molten steels. The linewidths observed with molten steel were narrower than those observed with solid steel in most of neutral atomic lines of iron and aluminum. Electron number density in the plasma produced on molten steel was estimated to be (0.99 ± 0.15) × 10 17 cm - 3, which was 46% of electron number density in the plasma on solid steel at the same observation delay of 10 μs from the laser pulse. The optical depths were obtained by evaluating the broadening due to self-absorption in the resonance line, FeI385.99 nm. The iron atom number density in the plasma induced on molten steel has been found to be 1.3 times that in the plasma induced on solid steel. © 2012 Elsevier B.V. All rights reserved.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2015-02-26

The present invention provides a method of manufacturing a steel sheet for a container which has a plated layer containing Ni of 300 to 1000 mg/m

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