MEMBER EXCELLENT IN DAMPING CAPACITY, PROCESS FOR PRODUCING THE SAME, AND STEEL SHEET EMPLOYED AS MEMBER EXCELLENT IN DAMPING CAPACITY

摘要

A MEMBER EXCELLENT IN DAMPING CAPACITY IN WHICH NOISE-REDUCING PROPERTIES AND VIBRATION-DAMPING PROPERTIES ARE ENHANCED IS PROVIDED BY EMPLOYING A STEEL SHEET HAVING HIGH WORKABILITY, AND A PROCESS FOR PRODUCING THE MEMBER AND A STEEL SHEET SUITABLE FOR THE MEMBER EXCELLENT IN THE DAMPING CAPACITY ARE PROVIDED. THE MEMBER EXCELLENT IN THE DAMPING CAPACITY IS PRODUCED BY FABRICATING A STEEL SHEET HAVING AN AVERAGE GRAIN DIAMETER OF 30 µm OR MORE AND A VICKERS HARDNESS OF 120 OR LESS AT THE HARDEST PART THEREOF. FOR EXAMPLE, THE STEEL SHEET HAS A COMPOSITION COMPOSED OF, BY MASS%, C: AT MOST 0.050%, Si: LESS THAN 1.0%, Mn: 0.05-0.5%, P: AT MOST 0.04%, S: AT MOST 0.03%, Al: AT MOST 1.0%, N: AT MOST 0.005%, AND THE BALANCE: Fe AND INEVITABLE IMPURITIES AND HAS AN AVERAGE GRAIN DIAMETER OF 30 µm OR MORE, AND THE MEMBER IS PRODUCED BY FABRICATING THE STEEL SHEET INTO A DESIRED SHAPE AND THEN HEAT-TREATING IT IN A TEMPERATURE RANGE OF 500°C OR HIGHER.