Stainless steel AISI 317L (1.4438) is a low-carbon austenitic alloy with an increased chromium content (up to 18%) and nickel (up to 13%). The percentage of carbon in steel does not exceed 0.03%, and it is completely bound by iron, representing a solid solution of cementite in the base metal matrix. From these grades, steel is characterized by an elevated (up to 3%) molybdenum content.
The chemical composition of the alloy determines its following features:
Increased resistance to corrosion, including high temperature.
High acid resistance.
Strength at elevated to 1300… 1800 0 С temperatures of long-term operation of products.
Durability under long loads, not exceeding the tensile strength.
Satisfactory weldability.
International Equivalent
| Mark | Analogue | W. Nr. | Aisi Uns | En |
|---|---|---|---|---|
| 03Х19Н13М3 | 1.4438 | 317L | X218-5-4 | |
| ~1.4438 | ~317L | X2CrNiMo18-15-4 |
Mechanical properties of 1.4438, AISI 317L
Tensile strength, Rm: 500 - 700 MPa
The yield point, Rp0,2: >200 MPa
Elongation, A:> 40%
Modulus of elasticity, E: 200 GPa
Hardness, HB: <215
Specific resistance, Ω: 0.85 mkOhm * m
Impact resistance, KV: > 60J
Linear expansion coefficient, α: 16.0 * 10-6 K-1
Thermal conductivity, λ: 14.0 W * m-1 * K-1
Thermal capacity, cp: 500 J * kg-1 * K-1
| Temperature (℃) | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 |
|---|---|---|---|---|---|---|---|---|---|---|
| Modulus of elasticity, E (GPa) | 194 | - | 186 | - | 179 | - | 172 | - | 165 | - |
| The yield point, Rp0,2 (MPa) | >172 | >157 | >147 | >137 | >127 | >120 | >115 | >112 | >110 | >108 |
| Linear expansion coefficient, α (* 10-6 K-1) | 16.0 | - | 16.5 | - | 17.0 | - | 17.5 | - | 18.0 | - |
Heat and plastic treatment of 1.4438, AISI 317L
forging and rolling at temperatures 1150 - 800℃
Supersaturation at 1020 - 1100 ℃
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