Sheet, ribbon 1.4438 - aisi 317L
|Mark||Analogue||W. Nr.||Aisi Uns||En||Order|
|03Х19Н13М3||1.4438||317L||X218-5-4||Delivery from the stock, in stock|
|~1.4438||~317L||X2CrNiMo18-15-4||Delivery from the stock, in stock|
Chemical Composition and Characteristics
The sheet and tape of AISI 317L steel, depending on the country of manufacture, may have a slightly different composition, in which, apart from chemically pure iron, the presence of at least 18… 19% chromium, at least 11… 12% nickel, as well as up to 4… 5% molybdenum. The alloy is characterized by an extremely low percentage of carbon, which does not exceed 0.035%.
Separate state standards of leading world manufacturers regulate the content of alloying elements of the alloy in the following ranges:
|Manufacturer||Technical norms / standard||Content of main components,%|
|USA||AISI||To 0.03||Not less than 24||22||0.75… 1.0|
|Russian Federation||TU||0.03||18… 19||12… 13||3… 5|
|Germany||DIN||0.02… 0.03||20||18||4… 5|
|Japan||JIS||0.03… 0.035||18… 20||11… 15||2… 4|
The sheet metal of the alloy in question is different:
- Extremely high corrosion resistance, in particular under severe operating conditions.
- High mechanical strength at high temperature loads with a predominance of tensile stresses.
- The presence of finely dispersed chromium carbides formed during smelting, which minimizes the possibility of subsequent corrosion damage and destruction.
- The durability of the use of parts that do not change their size with sudden temperature fluctuations.
Areas of application and workability
The sheet and tape of the alloy (1.4438) AISI 317L is applied:
- In fuel-burning devices and in scrubbing systems of metallurgical aggregates;
- For the manufacture of operational equipment for chemical and petrochemical industries;
- In the food industry;
- For parts of aggregates used for the production of paper products;
- In machines of textile production;
- In the pharmaceutical industry.
The alloy successfully resists corrosion phenomena that are caused by the constant exposure to aggressive media containing nitrides, sulfides and acids — sulfuric, formic, citric, etc. Intercrystalline corrosion (due to extremely low carbon content) is absent. The steel also has good weldability, and during the welding process shows weak magnetic properties.
In an oxygen-containing atmosphere, steel maintains a high level of its anticorrosive parameters up to temperatures of 870… 900 0 С. After smelting and rolling, the alloy has a relatively low hardness, not exceeding 95 HRC. However, with deformation, as well as high-speed machining, the material tends to harden.