Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
The Effect Alloying Elements on the Properties of SUH 31 Alloy
Yoshizumi NISHIYoshimichi MATSUMOTOKanoo KIKUCHIHitoshi IIDA
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1970 Volume 56 Issue 2 Pages 331-341

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Abstract

For valve alloys are required higher tensile strength, creep-ruptuer and fatigue strength at elevated temperatuers and high resistance to accelerated corrosion, by sodium, sulfur and vanadium in fuel. SUH 31 alloy has been developed as the most suitable alloy for exhaust valve.
We have tested the effects of alloying elements of Cr, Mn, Si, Nb and B of SUH 31 alloy.
The rusults obtained are as follows:
1. Short time tensile strength increased by 2.0-7.0 kg/mm2 higher than SUH 31 alloy by adding a small amount of N and 6.0-8.0% Mn instead of Ni. There was no change in the tensile properties by increasing Cr to about 19% and by varyng Si between 1.0% and 3.0%.
2. Creep-rupture strength increased remarkably by adding both B and N, but reduced by adding Cr, Mn and C respectively.
3. Cr was an effective element for the hot corrosion resistance. The optimium Cr content was about 19.0%. Si did not show a good effect on hot corrosion resistance by any immersion crucible tests at 800°C, but at 900°C. Replacement of Ni by Mrs ga ie a good effect for the test in synthetic ash containing 20 wt of Na2SO4.

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© The Iron and Steel Institute of Japan
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