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The turbine housing and the exhaust manifold are cast steel. I learned this when trying to get a broken stud removed from the turbine housing. The cast steel was harder than a tap.
Ni-Resist / austenitic cast iron (EN-GJLA/EN-GJSA)
High resistance to corrosion and not magnetisable
If one needs high resistance to corrosion, e.g. against the influences of sea water or against alkaline mediums, then the material Ni-Resist is highly suitable.
Further Ni-Resist, also called austenitic cast iron, is non-scaling, resistant to erosion and is not magnetisable.
The reason for these characteristics is the high share of nickel of more than 20 per cent.
Thus, Ni-Resist is often used in the areas of food industry, shipbuilding and medical engineering.
Examples for construction parts made of this material are pumps, valves, furnace parts, sockets, piston rings, compressors,------> turbo-charger casings<-------, exhaust manifolds. <----(maybe)
Details on the physical values of the materials we produce from Ni-Resist (austenitic cast iron) are available in the data sheet Ni-Resist/austenitic cast iron (EN-GJSA).pdf, which is available for you as a Download-file.
...The cast <strike>steel</strike> iron was harder than a tap.
Squad.
I thought I remembered reading that the Mitsu/Volvo turbine housings (exhaust side) were all cast steel? Anyone able to confirm this?
Trying to figure out if I need to heat up the grill or just scrub and weld?
I haven't heard of Ni-Resist before, so with info:
https://www.turbotechnics.com/contact/
Contact details
Area Contact
Enquiries: enquiries@turbotechnics.com
+ 44 1604 705050
Culberro brings some good info to this thread.
---
Also, I learned something new from Mr. Vanlandingham
Thank you..I thought this was common knowledge.
Then perhaps, rather than talk about what you "imagine is likely", you should talk directly with the people who make turbochargers?
Or even easier
They were very helpful when I spoke with them..and the guy who was competition liason gave me the direct line to a colleague who worked under him when they at Garrett UK when were developing the marelous TB3403
Or you could just keep on out-googling people and then telling us what you have figured out.
I mig welded a 2.5" to 3" v band adapter directly to my China bay/emusa turbo with 7170?? wire whatever is normal wire for carbon steel and it hasn't fallen off or cracked yet. I can't remember if I preheated it but I think I did.
I personally wouldn't bet a whole nickel on that...Turbine housing for hi-po allpications have a GOOD chance of being cast in "ni-resist" iron alloy..
Cast steel is a bitch to cast--expensive and more viscous meaning hard to pour into complicated shapes--like turbine housings---and thinner parts will cool rapidly leading to internal stresses...
It has its place but think "impact" ---where higher strength and "toughness" is needed..
https://www.esterer-giesserei.de/en/services/materials/cast-steel-gsgx/
Ni-resist is used in some hi-po applications for turbine housing because while it has high--maybe 20%+ nickle ----it is still cast iron base alloy which means dirt cheap..
As for manifolds..boring ordinary cast iron.. cost and lack of need for impact resistance..
Sure iron might seem weird after heating and cooling and oxidizing...but I think its the oxidizing that makes the surface so hard.
And this is not merely opinion, I spent several whole days talking across the desk from heads of several turbocharge manufacturers discussing manufacture of my favorite turbine housing. THEY brought up Ni-resist before I got to it in my discussion notes.
The turbine housing and the exhaust manifold are cast steel. I learned this when trying to get a broken stud removed from the turbine housing. The cast steel was harder than a tap.