The main difference between 304 vs 316 stainless steel is the composition và corrosion resistance, SS304 doesn’t contain molybdenum while SS316 contains 2-3% molybdenum. The addition of molybdenum provides pitting resistance in phosphoric acid, acetic acid và dilute chloride solutions & provides corrosion resistance in sulfurous acid. In addition, AISI 304 has a 18% Chromium và 8% Nickel nội dung while AISI 316 has a 16% Chromium and 10% Nickel.
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The Difference Between 304 và 316 Stainless Steel in Chemical Composition
|Steel Grade||C, ≤||Si, ≤||Mn, ≤||P, ≤||S, ≤||Cr||Ni||Mo|
304 stainless steel is the most common size of stainless steel used around the world, largely due khổng lồ its excellent corrosion resistance & value. It contains between 16 và 24 percent chromium và up to 35 percent nickel, as well as small amounts of carbon & manganese.
The most comtháng size of 304 stainless steel is 18-8, or 18/8, stainless steel, which contains 18 percent chromium and 8 percent nickel.
SS304 can withstvà corrosion from most oxidizing acids. That durability makes 304 easy lớn sanitize, & therefore ideal for kitchen & food applications. It is also comtháng in buildings, décor, và site furnishings.
304 stainless steel does have one weakness: it is susceptible to lớn corrosion from chloride solutions, or from saline environments like the coast. Chloride ions can create localized areas of corrosion, called “pitting,” which can spread beneath protective chromium barriers lớn compromise internal structures. Solutions with as little as 25 ppm of sodium chloride can begin khổng lồ have a corrosive effect.
SS316/SUS316 Stainless Steel
SS316 grade is the second-most comtháng khung of stainless steel. It has almost the same physical & mechanical properties as 304 stainless steel, & contains a similar material make-up. The key difference is that 316 stainless steel incorporates about 2 lớn 3 percent molybdenum. The addition increases corrosion resistance, particularly against chlorides và other industrial solvents.
316 stainless steel is commonly used in many industrial applications involving processing chemicals, as well as high-saline environments such as coastal regions & outdoor areas where de-icing salts are common. Due to its non-reactive qualities, 316 stainless steel is also used in the manufacture of medical surgical instruments.
Alternative sầu 300-series grades can contain up to lớn 7 percent molybdenum. They provide even better chloride resistance, but such heavy-duty resistance is only necessary in industrial or high concentration exposure conditions.
SS304 vs SS316 Mechanical Properties
|ASTMA276/A276M||UNSS30400||304||515 (75)||205 (30)||40||50||_||_||Annealed,Hot finished|
|UNSS30400||304||620 (90)||310 (45)||30||40||_||_||Annealed,Cold finished,≤ 12.7 mm|
|ASTMA240/A240M||UNSS30400||304||515 (75)||205 (30)||40||_||201||92|
SS304 vs SS316 Stainless Steel Cost
304 vs 316 stainless steel cost: Taking steel plates as an example, the cost of 316 is about 1.5 times the cost of 304. The price of stainless steel depends on the price of the alloying element and the amount of the alloy (eg Ni, Cr và Mo). The price of molybdenum (Mo) is about twice that of nickel (Ni), six times that of chromium (Cr), 316 nickel nội dung is higher than 304, & 316 contains molybdenum, while 304 does not contain it, so the cost of 316 is higher than 304.
SS304 vs SS316 Corrosion
Since Mo is added khổng lồ SS316, Mo can improve the pitting resistance và is therefore more resistant to corrosion than SS304. So SS316 more suitable to Offshore buildings and chemical plants where highly corrosive sầu environment.