Stainless Steel 316

SUS316 is a special anti-corrosion structure mainly used in food industry and surgical equipment.SUS316 is the second most widely used steel after 304. It is mainly used in food industry and surgical equipment. The addition of molybdenum makes it a special corrosion-resistant structure. Because it has better resistance to chloride corrosion than 304, it is also used as “ship steel”. SS316 is usually used in nuclear fuel recovery devices. 18/10 grade stainless steel usually also meets this application level.

Features: Because of the addition of Mo, its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and can be used under harsh conditions; excellent work hardening (non-magnetic); excellent high-temperature strength; non-magnetic in solid solution; cold The rolled product has good gloss and beautiful appearance; compared with 304 stainless steel, the price is higher.

Due to the addition of Mo element, 316 stainless steel has greatly improved its corrosion resistance and high temperature strength. The high temperature resistance can reach 1200-1300 degrees, and it can be used under harsh conditions.

Uses: equipment used in seawater, chemical, dye, paper, oxalic acid, fertilizer and other production equipment; photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.

Chemical Composition Of SUS316

• Carbon C: ≤0.030
• Silicon Si: ≤1.00
• Manganese Mn: ≤2.00
• Sulfur S: ≤0.030
• Phosphorus P: ≤0.045
• Chromium Cr: 16.00～18.00
• Nickel Ni: 10.00～14.00
• Molybdenum Mo: 2.00～3.00

The Corrosion Resistance Of Stainless Steel 316

316L is widely used in the chemical industry due to its excellent corrosion resistance. 316L is also a derivative steel of 18-8 type austenitic stainless steel, with 2 to 3% Mo element added. On the basis of 316L, many steel grades are also derived. For example, 316Ti is derived from adding a small amount of Ti, 316N is derived from adding a small amount of N, and 317L is derived from increasing the content of Ni and Mo.

Most of the existing 316L on the market is produced in accordance with American standards. For cost considerations, steel mills generally keep the Ni content of their products as low as possible. The American standard stipulates that the Ni content of 316L is 10-14%, and the Japanese standard stipulates that the Ni content of 316L is 12-15%. According to the minimum standard, there is a 2% difference in Ni content between the American standard and the Japanese standard. This is reflected in the huge price. Therefore, when purchasing 316L products, customers still need to see clearly whether the product is based on ASTM or JIS standards.

The Mo content of 316L makes the steel have excellent resistance to pitting corrosion and can be safely used in environments containing halogen ions such as Cl-. Because 316L is mainly used for its chemical properties, steel mills have slightly lower requirements for surface inspection of 316L (relative to 304). Customers with higher surface requirements should strengthen the surface inspection.

The Product Performance Of Stainless Steel 316

• Tensile strength (Mpa) 620 MIN
• Yield strength (Mpa) 310 MIN
• Elongation (%) 30 MIN
• Area reduction (%) 40 MIN
• Density of 316 stainless steel
• 7.98 g/cm³
• 316 chromium content (%) 16–18.

Features: Because of the addition of Mo, its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and can be used under harsh conditions; excellent work hardening (non-magnetic); excellent high-temperature strength; non-magnetic in solid solution; cold The rolled product has good gloss and beautiful appearance; compared with 304 stainless steel, the price is higher.

Due to the addition of Mo element, 316 stainless steel has greatly improved its corrosion resistance and high temperature strength. The high temperature resistance can reach 1200-1300 degrees, and it can be used under harsh conditions.
Uses: equipment used in seawater, chemical, dye, paper, oxalic acid, fertilizer and other production equipment; photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.

410

Characteristics: As a representative steel of martensitic steel, although it has high strength, it is not suitable for use in harsh corrosive environments; it has good workability and is hardened (magnetic) depending on the heat treatment surface.

Uses: blades, mechanical parts, petroleum refining devices, bolts, nuts, pump rods, class 1 tableware (knives and forks).

The difference between SUS316 stainless steel and SUS304 stainless steel

The two most commonly used stainless steels 304 and 316 (or 1.4308 and 1.4408 corresponding to German/European standards). The main difference in chemical composition between 316 and 304 is that 316 contains Mo, and it is generally recognized that 316 has better corrosion resistance. It is more corrosion resistant than 304 in high temperature environment. Therefore, in high-temperature environments, engineers generally choose 316 material components. But the so-called nothing is absolute, in a concentrated sulfuric acid environment, no matter how high the temperature is, don’t use 316. Otherwise, this matter can be a big problem. Anyone who learns machinery has learned threads, and remember that in order to prevent the threads from being seized at high temperatures, you need to apply a dark solid lubricant: molybdenum disulfide (MoS2), from which two conclusions can be drawn: One: Mo is indeed a high-temperature resistant substance (do you know what crucible is used to melt gold? Molybdenum crucible!). Two: Molybdenum easily reacts with high-valent sulfide ions to form sulfides. Therefore, no stainless steel is super invincible and corrosion-resistant. After all, stainless steel is a piece of steel with more impurities (but these impurities are more resistant to corrosion than steel). It is steel that can react with other substances.

The Density Of Difference Sus

Steel Grade	Density(g/cm3)
Steel Number	Density
304,304L,305,321 　201,202,301,302	7.93
316,316L,347 　309S,310S	7.98
405,410,420	7.75
409,430,434	7.7

Calculation formula

Weight (kg) = thickness (mm) * width (m) * length (m) * density value (g/cm3)

Thickness classification

(1) Thin plate (0.2mm-4mm) (2) Medium plate (3mm-30mm) (3) Thick plate (4mm-60mm) (4) Extra thick plate (60-115mm)

Maintenance Method

The use of 316 stainless steel plates has become more widespread with the development of the economy. People are closely related to stainless steel in their daily lives. However, many people don’t know much about the performance of stainless steel, and they know less about the maintenance of 316 stainless steel plates. Many people think that stainless steel will never rust. In fact, stainless steel has good corrosion resistance. The reason is that a passivation film is formed on the surface, which exists in the form of a more stable oxide in nature. In other words, although the degree of oxidation of stainless steel varies according to the conditions of use, it will eventually be oxidized. This phenomenon is usually called corrosion. All metal surfaces exposed in the corrosive environment undergo electrochemical reactions or chemical reactions, and are uniformly corroded.

In the passive film on the surface of the 316 stainless steel plate, the weak corrosion resistance is formed due to the self-excited reaction and the formation of small holes. In addition, the chloride ion is close to form a strong corrosive solution, which accelerates the corrosion reaction. speed. There is also intergranular corrosion cracking inside the stainless steel, all of which have a destructive effect on the passivation film on the surface of the stainless steel plate. Therefore, the stainless steel surface must be regularly cleaned and maintained to maintain its gorgeous surface and prolong its service life.

International conversion of thickness

US-made thickness and national standard thickness

• 28GA=0.015inches=0.38mm
• 26GA=0.018inches=0.46mm
• 24GA=0.024inches=0.61mm
• 22GA=0.030inches=0.76mm
• 20GA=0.036inches=1.00mm
• 18GA=0.048inches=1.20mm
• 16GA=0.060inches=1.60mm
• 14GA=0.075inches=2.00mm
• 12GA=0.105inches=2.70mm