# What is the difference between 321 and 304 stainless?

**URL:** https://forums.speedlife.net/t/what-is-the-difference-between-321-and-304-stainless/42867
**Category:** NYSpeed Automotive
**Created:** [February 3, 2008, 9:48am UTC](https://forums.speedlife.net/t/what-is-the-difference-between-321-and-304-stainless/42867 "2008-02-03T09:48:25Z")
**Posts on this page:** 1
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### Author: ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)
#### Post date: [February 7, 2008, 5:01am UTC](https://forums.speedlife.net/t/what-is-the-difference-between-321-and-304-stainless/42867/13 "2008-02-07T05:01:24Z")

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> **[Stainless steel](https://en.wikipedia.org/wiki/Stainless_steel)**
>
> In metallurgy, stainless steel, also known as inox steel or inox from French inoxydable (inoxidizable), is a steel alloy with a minimum of 10.5% chromium content by mass. Stainless steels are notable for their corrosion resistance, which increases with increasing chromium content. Molybdenum additions increase corrosion resistance in reducing acids and against pitting attack in chloride solutions. Thus, there are numerous grades of stainless steel with varying chromium and molybdenum contents to ...

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