Whats the difference between 304 316 stainless steel tubes?

What is the difference between 04 316 stainless steel tubes? They look very similar. SS304% SS316 is austenite, non-magnetic non heat hardening.

1. Different elements

SS304 - → CR 18%, Ni 8%

SS316 - → CR 16%, Ni 10% Mo 2%

2. Different performance

The addition of molybdenum to SS316 helps to resist chloride, such as seawater. It is suitable for coastal cities.

SS304 stainless steel pipe is usually cheaper, mainly used in kitchen utensils pots, tanks.

SS316 has high corrosion resistance can be used in oil refining equipment, pharmaceutical equipment, fasteners, bolts, etc.

3. Different maintenance methods

304 stainless steel: 18cr-8ni-0.08c has good corrosion resistance, machinability, strong acid resistance, can be used for manufacturing containers, tableware, metal furniture, architectural decoration medical equipment. 316 stainless steel: 18cr-12ni-2.5mo is more common in coastal buildings, ships, nuclear power, chemistry food equipment. It only improves the corrosion resistance of chemicals hydrochloric acid ocean, but also improves the corrosion resistance of brine the property of halogen solution.

4. Different brands

304 stainless steel is 0Cr18Ni9, while 316 stainless steel is 0Cr17Ni12Mo2

Calculation formula of single stainless steel pipe weight: (outer diameter actual thickness) * actual thickness * 0.02491 * length,

The weight calculation formula of stainless steel square tube is: (nozzle circumference / 3.14 actual thickness) * actual thickness * 0.02491 * length, 0.02491 is a constant converted stainless steel density.