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| Type: | Seamlss or Welded |
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| Chemical Composition of ASTM A268 409 S40900 Grade and EN 10088-2 1.4512 1.4516 Stainless Steel | |||||||||
| Grade | - | C | Mn | Si | P | S | Cr | Ni | Ti |
| A268 409 | min. max. | - 0.08 | - 1.00 | - 1.00 | - 0.045 | - 0.030 | 10.5 11.7 | - 0.50 | 6×C-0.75 |
| TP409L | min. max. | - 0.035 | - 1.00 | - 1.00 | - 0.045 | - 0.030 | 10.5 11.7 | - 0.50 | 6×C-0.75 |
| 1.4516 | min. max. | - 0.08 | - 1.50 | - 0.70 | - 0.040 | - 0.015 | 10.5 12.5 | 0.50-1.50 | 0.05-0.35 |
| 1.4512 | min. max. | - 0.030 | - 1.00 | - 1.00 | - 0.040 | - 0.015 | 10.5 12.5 | - 0.50 | 6×(C+N)-0.65 |
| Mechanical properties of ASTM A268 409 Grade and EN 10088-2 1.4512 stainless steel | |||||||||
| Grade | Tensile Strength | Yield Strength 0.2% Proof | Elongation | Hardness | Hardness | ||||
| Grade | ksi(MPa) min | ksi (MPa) min | (% in 50mm) min | Rockwell B (HR B) max | Brinell (HB) max | ||||
| 409 | 55 (380) | 25 (170) | 20 | 95 | 207 | ||||
| 1.4512 | 380-560 | 210 | 25 | ||||||
| Typical physical properties for annealed grade 409 stainless steels are given in table 3. | |||||||||
| Table 3. Physical properties of 409 grade stainless steel in the annealed condition | |||||||||
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Mean Coefficient of | ||||||
| Thermal Expansion | |||||||||
| (mm/m/°C) | Mean Coefficient of | ||||||||
| Thermal Expansion | |||||||||
| (mm/m/°C) | Mean Coefficient of | ||||||||
| Thermal Expansion | |||||||||
| (mm/m/°C) | Thermal Conductivity | ||||||||
| (W/m.K) | Thermal Conductivity | ||||||||
| (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nW.m) | |||||||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 409 | 7600 | 208 | 11 | 11.7 | 12.4 | 25.8 | 27.5 | 460 | 600 |
| Grade Specification Comparison | |||||||||
| Approximate grade comparisons for 409 stainless steel are given in table 4. | |||||||||
| Table 4. Grade specifications for 409 grade stainless steel | |||||||||
| Grade | UNS | BS | BS | EN | EN | Swedish | Japanese | ||
| - | No. | EN | Name | SS | JIS | ||||
| 409 | S40900 | 409S19 | - | 1.4512 | X6CrTi12 | - | SUH 409 | ||
| These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||||
| Possible Alternative Grades | |||||||||
| Possible alternative grades to grade 409 stainless steel are given in table 5. | |||||||||
| Table 5. Possible alternative grades to 409 grade stainless steel | |||||||||
| Grade | Why it might be chosen instead of 409 | ||||||||
| 3CR12 | Similar corrosion resistance, easier welding and more readily available than 409, particularly in heavy sections. (409 may have better drawability than 3CR12.) | ||||||||
| 304 | Better corrosion resistance and heat resistance but at higher cost. | ||||||||
| 321 | Higher heat resistance than 409 or 304. | ||||||||
| Aluminised steel | Lower resistance to exhaust gases, but at lower cost than stainless steel grade 409. | ||||||||
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