Stainless Steel Tube Library: What is the difference between 316L and S31603
Hit：422026-09-07 10:39:16
Stainless Steel Tube Library: What is the difference between 316L and S31603
S31603 and 316L are both made of the same material. S31603 is the US numerical code, while 316L is a common abbreviation for the material. The core difference lies in standard certification and impurity element control.
Identity correspondence: S31603 usually corresponds to 316L in the national standard for pressure equipment, and the national standard grade is 022Cr17Ni12Mo2.
Composition core: The carbon content is required to be ≤ 0.03%, belonging to ultra-low carbon stainless steel, with good resistance to intergranular corrosion after welding.
Consistent performance: There is no essential difference between the two in terms of corrosion resistance, mechanical strength, and processing performance
Standard certification: S31603 usually refers to materials produced in accordance with GB/T 24511 "Stainless Steel for Pressure Equipment" and certified. Steel mills need to obtain the corresponding certification to label this code.
Impurity control: S31603 has stricter requirements for phosphorus (P) content (≤ 0.035%), while ordinary TP316L allows ≤ 0.045%. If the acceptance is strict, ordinary 316L may be judged as unqualified due to excessive phosphorus.
Market name: 316L is the abbreviation of American standard UNS S31603. The 316L circulating in the market is mostly TP316L, which may not necessarily meet the strict impurity requirements of S31603
Acceptance note: If the contract specifies S31603, the phosphorus content and execution standards on the material list should be checked during acceptance to avoid using ordinary 316L as a substitute. General use: For general decoration, non pressure pipelines and other scenarios, ordinary 316L can meet the needs and has a higher cost-effectiveness. Pressure equipment: For scenarios involving boilers, pressure vessels, etc. that require strict acceptance according to standards, it is recommended to specify the requirement S31603.
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