It is also non-hardenable. 303 is a non-magnetic austenitic stainless steel that contains 18% chromium and 8% nickel. The following types of stainless steel are typically magnetic: Ferritic Stainless Steels such as grades 409, 430 and 439 Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. This disk will be the vacuum seal for the sample mount in a cryogenic chamber that can produce a field of 10 Tesla. 304 stainless steel contains chromium and nickel. Before determining this, it is good to understand what makes a grade of stainless steel magnetic or not. 304 Stainless Steel. Magnetic and non-magnetic stainless steels can typically be grouped together based on the type of stainless steel. Type 303 stainless steel, which is known formally as Stainless Steel type 1.4305 and A1, is a popular non-magnetic, austenitic stainless steel. Type 303 is known for a number of important characteristics including: Ease of fabrication Outstanding heat resistance and oxidation when intermittently exposed to temperatures up to 760°C Slightly higher corrosion resistance than Type 304 In order to be […] Here is the issue, I need to create a hole in a 304 stainless steel disk. In terms of cost, this will be more expensive than 304. Alloy 303 was specially designed to exhibit improved machinability while maintaining good mechanical and corrosion resistant properties Due to the presence of sulfur in the steel composition, Alloy 303 is the most readily machineable austenitic stainless steel; however, the sulfur addition does lower Alloy 303’s corrosion resistance to below that of Alloy 304. SS 303 has a higher sulfur content, which reduces the resistance on the cutting tool, but has a negative impact on the corrosion resistance, so the corrosion resistance is not as good as Type 303 and other 300 series austentic stainless steels will be magnetic after cold work. 303 Stainless Steel.

This is not strictly true and the real situation is rather more complicated.

There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1.

303 Stainless Steel. These are formed from the addition of chromium and can be hardened through the addition of carbon (making them 'martensitic') and are often used in cutlery. It improves the cutting performance while maintaining good mechanical properties.

316 stainless steel is an alloy steel that is less magnetic than the 304 grade. 303 Stainless Steel with the addition of Selenium improves machinability and allows for less galling.