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:
- Extremely high corrosion resistance, in particular under severe operating conditions.
- High mechanical strength at high-temperature loads with the predominance of tensile stresses.
- The presence of finely dispersed chromium carbides formed during melting, which minimizes the possibility of subsequent corrosion damage and destruction.
- 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.