France AFNOR NF A 35-578, NF A 49-214, Z6CNNb18-12B Specialsteel Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Standard | Country | Application | 
|---|---|---|---|---|---|
| Steel Grades | Specialsteel | Z6CNNb18-12B | AFNOR | France | Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery | 
| C | Si | Mn | P | S | Cr | Mo | Ni | B | Nb | 
|---|---|---|---|---|---|---|---|---|---|
| 0.04 -0.08 | ≤0.75 | ≤2.00 | ≤0.040 | ≤0.015 | 17.00 -19.00 | 11.00 -13.00 | ≤ ≥ | 0.0015 -0.0060 | 10×C - ≥ | 
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) | 
|---|---|---|---|---|---|---|
| 319 (≥) | 737 (≥) | 22 | 23 | 41 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 133 | 
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν | 
|---|---|---|---|---|---|---|---|
| 14 | - | - | 0.31 | - | |||
| 211 | 681 | - | 12.3 | 321 | - | ||
| 348 | - | 13 | 33.2 | 424 | 242 | 
Heat treated : 1773°C - 1315°C
| Grade | Standard | Country | Application | 
|---|---|---|---|
| Z6CNNb18-12B | |||
| Z6CNNb18-12B | 
| NF A 35-578 | Iron and steel. Stainless steel for high temperature application | NF-A-35-578.pdf | 
| NF A 49-214 | Steel tubes. Seamless austenitic steel tubes for use at high temperatures. Dimensions (with normal tolerances). Technical conditions of delivery | NF-A-49-214.pdf | 
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