Discussion
Hi,
This issue has just been discussed on the USA-TVR mail group. For those who dont follow this group I can repeat what I said about my experiences.
I have changed the pivot rods 2 times, first when I renovated the car after purchase and second time was when I changed from ruber to Polyurethan bushings. In order to make it easier to remove the pivot rods in future if I ever would need to do this I used stainless steel rods the second time.
The material I used is called Ferrite-Austenitic or duplex stainless steel and consist of 24-27% Chrome, 4.5-6% Nickel and 1.3-1.8% Molybdenium. It is very strong and comparable to good quality tool type mild steel, Ultimate tensile strength is 590N/sqmm, Yield tensile strength is 410N/sqmm and fatigue strength is also good at 350N/sqmm. The steel is recommended for use in pump shafts and propeller shafts. The Swedish standard number is SS-2324, even if that information maybe is not so useful for everyone. Similar steel must be possible to find elsewhere. It is not that easy to work with especially not to make nice threads at the ends but it was doable with some effort. This steel is not brittle as some other stainless steels and there should be no problems to use this for the pivot rods, it is certainly much stronger then the original mild pivot rods that are made of very cheap soft steel.
Regards Hans
This issue has just been discussed on the USA-TVR mail group. For those who dont follow this group I can repeat what I said about my experiences.
I have changed the pivot rods 2 times, first when I renovated the car after purchase and second time was when I changed from ruber to Polyurethan bushings. In order to make it easier to remove the pivot rods in future if I ever would need to do this I used stainless steel rods the second time.
The material I used is called Ferrite-Austenitic or duplex stainless steel and consist of 24-27% Chrome, 4.5-6% Nickel and 1.3-1.8% Molybdenium. It is very strong and comparable to good quality tool type mild steel, Ultimate tensile strength is 590N/sqmm, Yield tensile strength is 410N/sqmm and fatigue strength is also good at 350N/sqmm. The steel is recommended for use in pump shafts and propeller shafts. The Swedish standard number is SS-2324, even if that information maybe is not so useful for everyone. Similar steel must be possible to find elsewhere. It is not that easy to work with especially not to make nice threads at the ends but it was doable with some effort. This steel is not brittle as some other stainless steels and there should be no problems to use this for the pivot rods, it is certainly much stronger then the original mild pivot rods that are made of very cheap soft steel.
Regards Hans
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