摘要:
PROBLEM TO BE SOLVED: To provide a base material for a high toughness clad steel plate and a manufacturing method for the clad steel plate.SOLUTION: A base material for a high toughness clad steel plate contains, by mass%, C: 0.030 to 0.10%, Si: 0.10 to 0.30%, Mn: 1.30 to 1.80%, P: 0.015% or less, S: 0.003% or less, Mo: 0.05 to 0.50%, V: less than 0.010%, Nb: 0.010 to 0.060%, Ti: 0.005 to 0.020%, Al: 0.040% or less, Ca: 0.0010 to 0.0040%, N: 0.0030 to 0.0060%, and the rest is composed of Fe and inevitable impurities. The base material has characteristics having a ductile fracture rate of 85% or more in a DWTT test at -20°C.
摘要:
PROBLEM TO BE SOLVED: To provide an iron-based sintered material in which a contact pressure fatigue strength is improved.SOLUTION: The iron-based sintered material is used in such an environment that a lubricant is sufficiently fed. In the iron-based sintered material, a hard carbon coating 1 is provided on a surface of a base material 4 constructed by an iron-based sintered alloy having a pore 5 via a diffused surface hardened layer 3 and an interlayer 2, and a part of the pore 5 is not covered with the diffused surface hardened layer 3, the interlayer 2 and the hard carbon coating 1, but is formed in a state of being open to the surface of the diffused surface hardened layer 3.
摘要:
PROBLEM TO BE SOLVED: To provide a hot press member which can be manufactured without generating a scale, has the excellent coating adhesive properties and after-coating corrosion resistance, and also can suppress an invasion of hydrogen into steel followed by corrosion; and to provide a method for manufacturing the same.SOLUTION: In the hot press member, an Ni diffusion area exists on a steel plate crust constituting a member. An intermetallic compound layer equivalent to a γ phase existing in a balanced state diagram of a Zn-Ni alloy and a ZnO layer are sequentially provided on the Ni diffusion area, and a natural immersion potential indicated in a 0.5 MNaCl solution in which air at 25±5°C is saturated is -600 to -360 mV under the standard hydrogen electrode reference.