| Popis: |
This paper presents some direct elevated-temperature test comparisons of cast steel Grades WC4, WC5, WC6, and WC9 of ASTM Specification A217-49T. The materials studied are from commercial heats. Care has been taken to hold all variables in manufacture, treatment, and composition (aside from prescribed “alloy elements”) as closely alike as possible. The tests show that at the temperatures under consideration the nominal 1 per cent molybdenum grades WC5 and WC9 are higher in “creep strength” than the nominal ½ per cent molybdenum grades, WC4 and WC6. Grade WC5 has shown, in this direct comparison, higher “stress-rupture strength” than the other three grades. |
