A BETTER PROPOSITION:
Contrary to the popular belief that 304 grade is better than J4 grade due to addition of Nickle, it is the addition of hardness which makes J4 grade more” scratch resistant and durable”.

WHAT IS DIFFERENCE BETWEEN 304 & J4 ?

The main difference between J4 & 304 is the difference in their chemistries, especially the percentage of Ni. 304 contains a minimum of 8% Ni and J4 has a minimum of only 1% Ni. The chromium content is also slightly lower, but as seen from the PRE, this is compensated to a large extent by increased nitrogen. Ni content in stainless steel is one of the most frequently discussed aspects when one talks of stainless steel. It is commonly believed that the corrosion resistance of stainless steel is from Ni and higher Ni content means better corrosion resistance. This is not true and the real contributor to the corrosion resistance of stainless steels is chromium. Ni does give added protection in chemical applications. But in a normal application, where stainless steel is exposed to an oxidizing atmosphere (as is the common case), corrosion resistance is from chromium and the PRE is a good indicator of corrosion resistance.

J4 is 50% stronger than 304

COMPARISON CHART