Is stainless steel considered as alloy steel? 2

[Sam Low]

Hi Guys!

I would like to clarify if stainless steel material defined as alloy steel ?
As far as I concerned, technically all the steels are considered as alloy steel since they are content other elements besides carbon and ferrous (which is carbon steel).

For example;
Stainless steel - Iron alloy steel
Hastelloy - Nickel alloy steel


Please confirm if my concept is correct. Thanks!

 

[mfgenggear]

https://www.thoughtco.com/steel-grades-2340174

Different types of steel are produced according to the properties required for their application, and various grading systems are used to distinguish steels based on these properties.

Steel can be broadly categorized into four groups based on their chemical compositions:

Carbon Steels
Alloy Steels
Stainless Steels
Tool Steels
The table below shows the typical properties of steels at room temperature (25°C). The wide ranges of tensile strength, yield strength, and hardness are largely due to different heat treatment conditions.