From our experience 304SS small particles are more likely to be held in the flow than 316 SS particles due to its slightly more magnetic nature.
With its higher nickel composition range, 316 is considered the "most nonmagnetic" stainless steel. However, an item of 316 stainless steel which has significant welding or machining may be sufficiently magnetic to produce a noticeable attraction when brought near a magnet.
All stainless steel is magnetic except austenitic stainless steel which is actually 300 series stainless such as 304 and 316. However, 300 series stainless is non-magnetic only after it is freshly formed. 304 is almost for sure to become magnetic after cold work such as pressing, blasting, cutting, etc.
Duplex stainless steels are most commonly magnetic in nature because they include a blend of ferrite and austenite. The abundant amount of ferrite is mixed in Duplex Steel which makes it magnetic. But, duplex stainless steels have a higher austenite blend than ferritic steels, which can be slightly weak magnetic.
The least magnetic steels
Stainless steel type 304, which contains 8% nickel and 18% chromium, along with small amounts of carbon, nitrogen and manganese make this steel nonmagnetic.
Connect the automatic demagnetizer's power plug to a standard alternating current outlet and turn the unit's power on, if needed. Set it on a non-metallic table. Press the demagnetizer's “trigger” button momentarily. The device runs through a demagnetization process automatically.
Aesthetically, there is no difference between the two; in fact, the only way to differentiate between them is to test them chemically. The main difference between 304 and 316 stainless steel is 316 SS has the addition of molybdenum.
Stainless Steel – Magnetism & Corrosion Resistance – There Is No Connection. There is a myth in the stainless steel industry that stainless steel is not magnetic.
In austenitic steel, there is a higher percentage off chromium, and nickel is also present. In terms of magnetism, it is the addition of nickel that renders the steel non-magnetic.
Austenitic stainless steels are the more common types of stainless. These grades have higher chromium and nickel content. The higher nickel content makes austenitic grades non-magnetic. Austenitic steels are similarly non-hardenable by heat treating, but also have excellent formability and higher corrosion resistance.
The reason your refrigerator doesn't hold a magnet, according to Peter Eng, a physicist at the University of Chicago, is that different stainless steels contain different proportions of nickel (added to help keep steel from cracking and to allow the addition of more carbon, for strength).
Wrought, austenitic stainless steels, such as 304 and 316, are generally regarded as non-magnetic in the annealed condition, i.e. they are not attracted significantly by a magnet. However, if they are cold worked they will be attracted to a permanent magnet.
Only some stainless steel is magnetic and can be magnetized. The composition of stainless steel varies, and any stainless steel with nickel in it is difficult to magnetize, although cold-rolling it, stretching it or stressing it in other ways does increase its magnetic potential.
Austenitic steel type 316L is a special, extra-low carbon version of austenitic chromium nickel stainless steel containing molybdenum. The steel belongs to so-called 'non-magnetic' austenitic stainless steel [14, 15]. In general, the 316L austenitic steel exhibits weak magnetic properties.
It is commonly used in chemical and petrochemical industry, in food processing, pharmaceutical equipment, medical devices, in potable water, wastewater treatment, in marine applications and architectural applications near the seashore or in urban areas.
Most of the polished and cold-worked steel bar products, such as grades 303 and 304, will have a considerable quantity of magnetism gained through cold-working. However, grades 310 and 316, having high nickel content, tend to have much less magnetism.
Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel.
Is Food Grade stainless steel magnetic? Ferritic and martensitic grades of stainless steel are magnetic. Austenitic grades are not magnetic due to their nickel content.
316 grade steel is often known as Marine Grade Stainless Steel and is one of the most common stainless steel on the market. It is an austenitic grade that has also 2-3% molybdenum, further enhancing corrosion resistance.
5) The traditional ferritic and austenitic stainless steels (including types 304 and 316) are unsuitable for use in seawater because they are prone to crevice corrosion and pitting attack, giving rise to a high probability of premature failure.
The nickel is the key to forming austenite stainless steel.
So the “magnet test” is to take a magnet to your stainless steel cookware, and if it sticks, it's “safe”—indicating no nickel present—but if it doesn't stick, then it's not safe, and contains nickel (which is an austenite steel).
316 stainless steel will rust after a long time. Due to the addition of Mo element, 316 stainless steel has greatly improved its corrosion resistance and high temperature resistance. The high temperature resistance can reach 1200-1300 degrees, and it can be used under harsh conditions.
316L stainless steel is almost identical to 316. The only difference is the carbon content. 316L's lower carbon content imparts even better corrosion resistance than 316. 316L does not require post-weld annealing.
Typically, 316 grade stainless steel costs slightly more than 304 grade steel because of its enhanced chemical and production properties. The extra cost can be justified, however, because hardware made of type 316 stainless steel is extra resistant to tarnish and corrosion, enabling it to last a very long time.
Stainless steel grades 410, 420 and 440 – martensitic stainless steels. This type of stainless steel is magnetic primarily because it contains large quantities of ferrite in its chemical composition, which is a compound of iron and other elements.