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ASME SB677, ASTM B677 TP904L (UNS N08904) Stainless Steel Seamless Pipe
TP904L is a non-stabilised low carbon high alloy austenitic stainless
steel. The addition of copper to this grade gives it greatly
improved resistance to strong reducing acids, particularly
sulphuric acid. It is also highly resistant to chloride attack -
both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and has excellent
weldability and formability. The austenitic structure also gives
this grade excellent toughness, even down to cryogenic
temperatures. 904L does have very substantial contents of the high
cost ingredients nickel and molybdenum. Many of the applications in
which this grade has previously performed well can now be fulfilled
at lower cost by duplex stainless steel 2205 (S31803 or S32205), so
it is used less commonly than in the past.
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| TP904L | min. max. | - 0.020 | - 2.00 | - 1.00 | - 0.045 | - 0.035 | 19.0 23.0 | 4.0 5.0 | 23.0 28.0 | 1.0 2.0 |
Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 35 | 70-90 typical | - |
| Rockwell Hardness value range is typical only; other values are specified limits. | |||||
Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Co-eff of Thermal Expansion (m/m/C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100C (J/kg.K) | Elec Resistivity (n.m) | |||
| 0-100C | 0-315C | 0-538C | At 20C | At 500C | |||||
| TP904L | 8000 | 200 | 15 | - | - | 13 | - | 500 | 850 |
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| TP904L | N08904 | 904S13 | - | 1.4539 | X1NiCrMoCuN25-20-5 | 2562 | - |
| 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. | |||||||
| Grade | Why it might be chosen instead of 904L |
| 316L | A lower cost alternative, but with much lower corrosion resistance. |
| 6Mo | A higher resistance to pitting and crevice corrosion resistance is needed. |
| 2205 | A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300C.) |
| Super duplex | Higher corrosion resistance is needed, together with a higher strength than 904L. |
Applications:
