12X18H9TL steel
12X18H9TL steel
Steel 12X18H9TL: a classifier of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperatures, physical, mechanical, technological and foundry properties for the grade — Steel 12X18H9TL.
General information about 12X18H9TL steel
| Delivery type |
| GOST 2176−77 castings. |
| Application |
| Various mechanical engineering parts operating at temperatures not exceeding 700 ° C. Steel is corrosion-resistant, heat-resistant at temperatures up to 600 °C, austenitic class. |
Chemical composition of steel 12Х18Н9ТЛ
| Chemical element | % |
| Silicon (Si) | 0.20−1.0 |
| Manganese (Mn) | 1.0−2.0 |
| Copper (Cu), not more than | 0.30 |
| Nickel (Ni) | 8.0−11.0 |
| Sulfur (S), max. | 0.03 |
| Titanium (Ti), not more than | 0.60 |
| Carbon ©, not more than | 0.12 |
| Phosphorus (P), not more than | 0.035 |
| Chromium (Cr) | 17.0−20.0 |
Mechanical properties of 12X18H9TL steel
Mechanical properties at elevated temperatures
| t test,°C | σ0, 2, MPa | σB, MPa | δ5, % | ψ, % | KCU, J/m2 | |||||||||
| Austenitizing at 1100 °C, 4 h., air. Stabilization at 800 °C, 1020 °C, cooling with furnace. | ||||||||||||||
| 20 | 195−235 | 500−660 | 24−25 | 30−35 | 78−108 | |||||||||
| 350 | 195 | 335−370 | 11−13 | 25−29 | 64−98 | |||||||||
| 400 | 195 | 355−370 | 12−17 | 24−41 | 69−108 | |||||||||
| 450 | 165 | 355 | 23 | 42−46 | 78−98 | |||||||||
| 500 | 185 | 345 | 17 | 35−42 | 69−88 | |||||||||
| 550 | 195 | 305 | 23 | 51 | 98 | |||||||||
| 600 | 155 | 275 | 24 | 47 | 88 | |||||||||
| 650 | 175 | 275 | 17−21 | 33−39 | 78−108 | |||||||||
| 700 | 175 | 225−255 | 15−17 | 26−38 | 88 | |||||||||
Mechanical properties in sections up to 100 mm
| Heat treatment, delivery condition | σ0, 2, MPa | σB, MPa | δ5, % | ψ, % | KCU, J/m2 |
| 1050−1100°C hardening, water, oil or air. | 200 | 450 | 25 | 32 | 60 |
Mechanical properties across the section of the cast billet
| Heat treatment, delivery condition | σ0, 2, MPa | σB, MPa | δ5, % | KCU, J/m2 | HB | |||||||||
| Section of the billet 200 mm. | ||||||||||||||
| 1060−1070°C hardening, water. Specimen cutout area C | 225−245 | 455−510 | 30−49 | 172−196 | 143−156 | |||||||||
| Stabilizing annealing at 840−850°C, 4 h, air. Sample cutout location — K | 230−265 | 465−515 | 42−53 | 157−208 | 156 | |||||||||
Technological properties of steel 12Х18Н9ТЛ
| Weldability |
| Limited weldability. Welding methods: RDS and ADS under gas protection. Heating and subsequent heat treatment is recommended. |
Physical properties of steel 12Х18Н9ТЛ
| Test temperature, °С | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 |
| Modulus of normal elasticity, E, GPa | 194 | 189 | 176 | 165 | 149 | 138 | 133 | 125 | 112 | |
| Thermal conductivity coefficient W/(m — °C) | 15 | 16 | 18 | 19 | 21 | 22 | 24 | 25 | 26 | 27 |
| Electrical resistivity (p, nominal value — m) | 750 | 815 | 879 | 943 | 1006 | 1031 | 1082 | 1123 | 1152 | 1184 |
| Test temperature,°C | 20−100 | 20−200 | 20−300 | 20−400 | 20−500 | 20−600 | 20−700 | 20−800 | 20−900 | 20−1000 |
| Coefficient of linear expansion (a, 10−6 1/°C) | 16.8 | 17.0 | 17.4 | 17.7 | 18.1 | 18.5 | 18.9 | 19.1 | 19.1 | |
| Specific heat capacity (C, J/(kg -°C)) | 512 | 533 | 542 | 554 | 571 | 580 | 588 | 596 |
Casting properties of steel 12Х18Н9ТЛ
| Temperature at the beginning of solidification, °C | 1425−1440 |
| Linear shrinkage, % | 2.7−2.8 |
| Crack resistance coefficient, Kt.y. | 1.0 |
| Fluidity, Kj.t. | 1.0 |
| Tendency to formation of shrinkage shells, K.r. | 1.0 |
| Propensity to formation of shrinkage porosity, Ku.p. | 1.0 |
