Why not 316L?

Surely 904L steel is overkill then.
Stephanos provided some good insight into this steel alloy some time ago.

(...)In chloride containing environments over 60°C, grade 303 stainless steel is subject to pitting and crevice corrosion. Grade 303 stainless is not suitable for use in marine environments.(...)

https://nextgenerationmetals.com/product...ess-steel/

Worldwide ,tap water contains chlorides .
Believe me or not ,using hot tap water to rinse
any razor made from 303 can potentially
corrode the razor.That reason alone makes
303 stainless steel an inappropriate and unsuitable material
for making anything that will potentially come
in contact with hot tap water.Period.

https://www.practicalmachinist.com/forum...ess.89729/

I still have my Pot Metal(handle AND head) Yuma razor I bought 17-18 years ago and it was my daily driver for 3 years or so. It's survived fine. Makes me think SS of any grade will be fine for my lifetime left

Dave,ZAMAK razors are usually thick plated either with Nickel and/or Chromium,which if left intact will protect the pot metal indefinitely .
If the plating is scratched ,chipped or removed ,it's only a matter of relatively short time ,until the ZAMAK dezincification process will completely destroy the item.

From the other hand ,I 've seen with my own eyes what hot tap water can do to a 303 razor.
A fellow shaver ( who shaves using hot tap water ) posted few years ago at a Greek shaving forum few pics with the threaded pin of the cap ,completely snapped off ,and screwed into the handle..."All I did was to tighten the razor to start shaving and I never use excess force doing so ! " he stated .
I asked him to send me the razor to just inspect it .
Yeap,the threaded pin snapped off the top cap ,due to a large crevice corrosion damage at the base of the threaded pin .
Oh,forgot to mention that one :
https://www.corrosionpedia.com/definitio.../threading

When I discovered the crevice corrosion damage,I then begun to investigate and search how such a thing was even possible to happen !
How ?
303 stainless steel razor and hot tap water for rinsing .
That's how !

Of course ,everyone is free to spend his hard earned money as he wishes and choose whatever he likes.
But facts remain facts,no matter of our choices .

Dave,ZAMAK razors are usually thick plated either with Nickel and/or Chromium,which if left intact will protect the pot metal indefinitely .
If the plating is scratched ,chipped or removed ,it's only a matter of relatively short time ,until the ZAMAK dezincification process will completely destroy the item.

From the other hand ,I 've seen with my own eyes what hot tap water can do to a 303 razor.
A fellow shaver ( who shaves using hot tap water ) posted few years ago at a Greek shaving forum few pics with the threaded pin of the cap ,completely snapped off ,and screwed into the handle..."All I did was to tighten the razor to start shaving and I never use excess force doing so ! " he stated .
I asked him to send me the razor to just inspect it .
Yeap,the threaded pin snapped off the top cap ,due to a large crevice corrosion damage at the base of the threaded pin .
Oh,forgot to mention that one :
https://www.corrosionpedia.com/definitio.../threading

When I discovered the crevice corrosion damage,I then begun to investigate and search how such a thing was even possible to happen !
How ?
303 stainless steel razor and hot tap water for rinsing .
That's how !

Of course ,everyone is free to spend his hard earned money as he wishes and choose whatever he likes.
But facts remain facts,no matter of our choices .

I'm pretty sure that this that came from Turkey for about $1.25 did not have any nickel involved with it but I could be wrong. Many people had issues with them I use very hot water to rinse my razors and then dry them off. Mine still works great in fact I'll probably use it tomorrow. Thanks for getting me to drag it out LOL

Dave,indeed your razor was ( once upon a time ...) Nickel plated ( easily recognizable by the remaining yellowish tint ...hm...here and there at least .

Not all ZAMAK pot metals are ...blended equally : there are few (low lead) "recipies" that offer greater dezincification resistance than the rest of ZAMAK alloys.

Seems that your Yuma razor is holding up very well ! Drying it after each use ,surely helps a lot to avoid the so called "zinc pest " .
https://en.m.wikipedia.org/wiki/Zinc_pest

Dave,ZAMAK razors are usually thick plated either with Nickel and/or Chromium,which if left intact will protect the pot metal indefinitely .
If the plating is scratched ,chipped or removed ,it's only a matter of relatively short time ,until the ZAMAK dezincification process will completely destroy the item.

From the other hand ,I 've seen with my own eyes what hot tap water can do to a 303 razor.
A fellow shaver ( who shaves using hot tap water ) posted few years ago at a Greek shaving forum few pics with the threaded pin of the cap ,completely snapped off ,and screwed into the handle..."All I did was to tighten the razor to start shaving and I never use excess force doing so ! " he stated .
I asked him to send me the razor to just inspect it .
Yeap,the threaded pin snapped off the top cap ,due to a large crevice corrosion damage at the base of the threaded pin .
Oh,forgot to mention that one :
https://www.corrosionpedia.com/definitio.../threading

When I discovered the crevice corrosion damage,I then begun to investigate and search how such a thing was even possible to happen !
How ?
303 stainless steel razor and hot tap water for rinsing .
That's how !

Of course ,everyone is free to spend his hard earned money as he wishes and choose whatever he likes.
But facts remain facts,no matter of our choices .

Do you have any photos?

It would be pretty unfair for a particular razor maker to post any of the available photos.The damaged cap was replaced
with a new one,free of charge.

It would be pretty unfair for a particular razor maker to post any of the available photos.The damaged cap was replaced
with a new one,free of charge.

I was just wondering what you meant by large crevice damage.

https://www.iwindsurf.com/forums/viewtopic.php?p=214847

Here is a good example of crevice corrosion on a bolt.