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Resistance to grain coarsening properties and workability as well as the steel for machine structure for excellent carburizing parts in toughness
Resistance to grain coarsening properties and workability as well as the steel for machine structure for excellent carburizing parts in toughness
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机译:耐晶粒粗化性能和可加工性,以及用于韧性优异的渗碳零件的机械结构钢
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摘要
PROBLEM TO BE SOLVED: To provide steel for machine structure that hardly causes crystal grain coarsening when carburizing treatment is performed, and is excellent in toughness.;SOLUTION: The steel for machine structure includes by mass: C:0.10-0.30%, Si:0.05-2.0%, Mn:0.10-0.50%, P:0.030% or less, S:0.030% or less, Cr:1.80-3.00%, Al:0.005-0.050%, Nb:0.02-0.10%, N:0.0300% or less, and the balance consisting of Fe and inevitable impurities, wherein the structure before cold working is a ferrite and pearlite structure, and the average value of the ferrite grain size is at least 15 microns. The steel is excellent in the crystal grain coarsening-proof property and toughness in which the heat treatment shown in Figure 1 is performed.;COPYRIGHT: (C)2013,JPO&INPIT
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