316L stainless steel
316L is a stainless steel grade, AISI 316L is the corresponding US label, sus 316L is the corresponding Japanese label. China's unified digital code for the S31603, standard grade 022Cr17Ni12Mo2 (new standard), the old grade 00Cr17Ni14Mo2, said mainly contains Cr, Ni, Mo, the number that contains the percentage. The national standard is GB / T 20878-2007 (current edition).
Chinese name 316L English name AISI 316L main components Cr, Ni, Mo standard grade 022Cr17Ni12Mo2
Carbon C: ≤0.030 Silicon Si: ≤ 1.00
Sulfur S: ≤0.030
Phosphorus P: ≤0.045
Cr Cr: 16.00 ~ 18.00
Ni: 10.00 ~ 14.00
Molybdenum Mo: 2.00 to 3.00
316L because of its excellent corrosion resistance in the chemical industry has a wide range of applications, 316L is also 18-8 type austenitic stainless steel derived steel, add 2 to 3% Mo element. On the basis of 316L, also derived a lot of steel, such as the addition of a small amount of Ti derived 316Ti, add a small amount of N after the derivative of 316N, increased Ni, Mo content derived 317L.
Most of the existing 316L on the market is produced in accordance with American Standard. For cost considerations, steel mills generally rely on the product as much as possible. American standard, 316L of the Ni content of 10 to 14%, the Japanese standard is specified, 316L of the Ni content of 12 to 15%. According to the minimum standards, American Standard and Japanese standard in the Ni content of 2% difference, reflected in the price is still quite large, so customers buy 316L products still need to see, the product is the reference ASTM or JIS standards.
The Mo content of the 316L makes the steel have excellent pitting resistance and can be safely applied to halogen-containing environments such as Cl-. As the main application of 316L is its chemical properties, the steel surface of the 316L surface inspection requirements slightly lower (relative to the 304), the surface requirements of the higher customers to strengthen the surface inspection efforts.
Tensile strength σb (MPa): ≥480
Conditional yield strength σ0.2 (MPa): ≥177
Elongation rate δ5 (%): ≥40
Section shrinkage ψ (%): ≥60
Hardness: ≤ 187HB; ≤ 90HRB; ≤200HV
Density: 7.98 g / cm3;
Specific heat capacity ratio (20 ° C): 0.502 J / (g * K)
Now the two most commonly used 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 Mo, and generally recognized, 316 better corrosion resistance , More corrosion resistance than 304 in high temperature environment. So in high temperature environment, engineers will generally use the 316 material parts. But the so-called things without absolute, in the concentrated sulfuric acid environment, and then do not use the high temperature 316. Otherwise, this may be a big. Learn mechanical threads have learned threads, remember to prevent the high temperature in the case of thread bite, need to smear a kind of dark solid lubricant it: molybdenum disulfide (MoS2), from it to get 2 points The conclusion is not: a: Mo is indeed a high temperature of the material (know what the crucible melting gold? Molybdenum crucible!). 2: molybdenum is easy and high sulfur ions generated by sulfide. So there is no one kind of stainless steel is super invincible corrosion resistance. In the final analysis, stainless steel is an impurity more steel, steel and other substances can react.
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