Sheet, strip 1.4438 - aisi 317L

International Equivalent

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

Sheet and strip steel AISI 317L, depending on the country of manufacture, may have a slightly different composition, in which, in addition to chemically pure iron, the presence of not less than 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%.

Some state standards of the leading world manufacturers regulate the alloying elements content in such limits:

Manufacturer Specification/standard С Cr Ni Mo
USA AISI Up to 0.03 Not less than 24 22 0,75...1,0
Germany DIN 0,02...0,03 20 18 4...5
Japan JIS 0,03...0,035 18...20 11...15 2...4

Rolled sheets of the alloy in question are characterized by:

  1. Extremely high corrosion resistance, in particular under severe operating conditions.
  2. High mechanical strength at high-temperature loads with the predominance of tensile stresses.
  3. The presence of finely dispersed chromium carbides formed during melting, which minimizes the possibility of subsequent corrosion damage and destruction.
  4. Longevity of parts that do not change their dimensions under sharp temperature fluctuations.

Applications and machinability

AISI 317L sheet and strip alloy (1.4438) is used:

  • In fuel combustion devices and in scrubber systems of metallurgical units;
  • For the manufacture of operational equipment in the chemical and petrochemical industries;
  • In the food industry;
  • For parts of units used for the production of paper products;
  • In the machines of the textile industry;
  • In the pharmaceutical industry.

Alloy successfully resists corrosive phenomena, which are caused by constant exposure to aggressive environments containing nitrides, sulfides and acids - sulfuric, formic, citric, etc. Intercrystalline corrosion (due to the extremely low carbon content) is absent. The steel also has good weldability and exhibits weak magnetic properties when welded.

In an oxygen-containing atmosphere, the steel retains a high level of its anti-corrosion properties up to temperatures of 870...9000 C. After melting and rolling the alloy has a relatively low hardness not exceeding 95 HRC. However, the material tends to harden during deformation as well as high-speed machining.