316L is a brand of stainless steel material, and different countries have slightly different standards for the chemical composition of 316L.AISI 316L is the corresponding American label, SUS 316L is the corresponding Japanese label.The unified number code in China is S31603, the standard brand number is 022Cr17Ni12Mo2 (new brand), the old brand number is 00Cr17Ni12Mo2, which means Cr, Ni and Mo are mainly contained, and the number is about the percentage.The national standard is GB/T 20878-2007 (current version).In addition to the production process and technology differences, the use of stainless steel is mainly affected by the content of chemical elements.
316L STAINLESS INFOS
（ASTM） 316L
（GB） 022Cr17Ni12Mo2（新标）
（SUS） SUS316
PROPERTY Mo should be added, so its corrosion resistance, atmospheric corrosion resistance and high temperature strength is particularly good, can be used under harsh conditions.Work hardening excellent (non-magnetic
APPLICATION Seawater equipment, chemical, dye, paper.Oxalic acid, fertilizer and other production equipment;Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts,ETC
CHEMICAL COMPOSITION(%)
（C） ≤0.030
（Mn） ≤2.00
（Si） ≤1.00
（P） ≤0.045
（S） ≤0.03
（Ni） 10.0-14.0
（Cr） 16.0-18.0
（Mo） 2.0-3.0
1
CORROSION RESISTANCE
316L is widely used in chemical industry due to its excellent corrosion resistance. 316L is also a derivative type of 18-8 austenitic stainless steel, with 2 ~ 3% Mo element added.On the basis of 316L, many kinds of steel are derived. For example, 316Ti is derived after adding a small amount of Ti, and 316N is derived after adding a small amount of N, and 317L is derived after increasing the content of Ni and Mo.Most of the 316L currently on the market is manufactured to American standards.Considering the cost, steel mills generally try to lower the Ni content of products.The American standard stipulates that the Ni content of 316L is 10-14%, while 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 American standard and Japanese standard, which is quite huge in terms of price. Therefore, customers still need to see clearly whether the products should refer to ASTM or JIS standard when they choose and buy 316L products.The Mo content of 316L enables the steel to have excellent corrosion resistance and can be safely used in halogen ion environments including Cl-.Since 316L is mainly used for its chemical properties, the steel plant has slightly lower requirements on surface inspection of 316L (relative to 304), and customers with higher requirements on the surface should strengthen the surface inspection.
MECHANICAL PROPERTY
TENSILE STRENGTH σb (MPa) ≥480
YIELD STRENGTH σ0.2 (MPa) ≥177
ELONGATION δ5 (%) ≥40
ψ (%) ≥60
HARDNESS ≤187HB；≤90HRB；≤200HV
DENSITY 7.98g/cm3
SPECIFIC HEAT CAPACITY（20℃） 0.502J/(g*K)
HEAT CONDUCTIVITY（W/(m*K)）
100℃ 300℃ 500℃
15.1 18.4 20.9
IDENTIFY
Now the most commonly used two kinds of stainless steel 304, 316 (or corresponding to The German/European standard 1.4308, 1.4408), 316 and 304 in the chemical composition of the most important difference is 316 containing Mo, and generally recognized that 316's corrosion resistance is better than 304 in the high temperature environment more corrosion resistance.Therefore, in the high temperature environment, engineers will generally choose parts made of 316 materials.But the so-called matter is not absolute, in the concentrated sulfuric acid environment, then the high temperature must not use 316, otherwise the matter can be a big.Mechanics students have learned about threading, and remember the black, solid lubricant (MoS2) needed to prevent threads from biting to death at high temperatures.Two conclusions can be drawn from this: First, Mo is indeed a heat-resistant substance. (Do you know what crucible gold is melted in?Molybdenum crucible!).Second: molybdenum reacts easily with high sulfur ions to form sulfides.So no stainless steel is super resistant to corrosion.After all, stainless steel is just a piece of steel with more impurities (which are more resistant to corrosion than steel) that can react with other substances.
316L STAINLESS INFOS
（ASTM） 316L
（GB） 022Cr17Ni12Mo2（新标）
（SUS） SUS316
PROPERTY Mo should be added, so its corrosion resistance, atmospheric corrosion resistance and high temperature strength is particularly good, can be used under harsh conditions.Work hardening excellent (non-magnetic
APPLICATION Seawater equipment, chemical, dye, paper.Oxalic acid, fertilizer and other production equipment;Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts,ETC
CHEMICAL COMPOSITION(%)
（C） ≤0.030
（Mn） ≤2.00
（Si） ≤1.00
（P） ≤0.045
（S） ≤0.03
（Ni） 10.0-14.0
（Cr） 16.0-18.0
（Mo） 2.0-3.0
1
CORROSION RESISTANCE
316L is widely used in chemical industry due to its excellent corrosion resistance. 316L is also a derivative type of 18-8 austenitic stainless steel, with 2 ~ 3% Mo element added.On the basis of 316L, many kinds of steel are derived. For example, 316Ti is derived after adding a small amount of Ti, and 316N is derived after adding a small amount of N, and 317L is derived after increasing the content of Ni and Mo.Most of the 316L currently on the market is manufactured to American standards.Considering the cost, steel mills generally try to lower the Ni content of products.The American standard stipulates that the Ni content of 316L is 10-14%, while 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 American standard and Japanese standard, which is quite huge in terms of price. Therefore, customers still need to see clearly whether the products should refer to ASTM or JIS standard when they choose and buy 316L products.The Mo content of 316L enables the steel to have excellent corrosion resistance and can be safely used in halogen ion environments including Cl-.Since 316L is mainly used for its chemical properties, the steel plant has slightly lower requirements on surface inspection of 316L (relative to 304), and customers with higher requirements on the surface should strengthen the surface inspection.
MECHANICAL PROPERTY
TENSILE STRENGTH σb (MPa) ≥480
YIELD STRENGTH σ0.2 (MPa) ≥177
ELONGATION δ5 (%) ≥40
ψ (%) ≥60
HARDNESS ≤187HB；≤90HRB；≤200HV
DENSITY 7.98g/cm3
SPECIFIC HEAT CAPACITY（20℃） 0.502J/(g*K)
HEAT CONDUCTIVITY（W/(m*K)）
100℃ 300℃ 500℃
15.1 18.4 20.9
IDENTIFY
Now the most commonly used two kinds of stainless steel 304, 316 (or corresponding to The German/European standard 1.4308, 1.4408), 316 and 304 in the chemical composition of the most important difference is 316 containing Mo, and generally recognized that 316's corrosion resistance is better than 304 in the high temperature environment more corrosion resistance.Therefore, in the high temperature environment, engineers will generally choose parts made of 316 materials.But the so-called matter is not absolute, in the concentrated sulfuric acid environment, then the high temperature must not use 316, otherwise the matter can be a big.Mechanics students have learned about threading, and remember the black, solid lubricant (MoS2) needed to prevent threads from biting to death at high temperatures.Two conclusions can be drawn from this: First, Mo is indeed a heat-resistant substance. (Do you know what crucible gold is melted in?Molybdenum crucible!).Second: molybdenum reacts easily with high sulfur ions to form sulfides.So no stainless steel is super resistant to corrosion.After all, stainless steel is just a piece of steel with more impurities (which are more resistant to corrosion than steel) that can react with other substances.