ASME SB677/ASTM B677 TP904L/NO8904 STAINLESS STEEL SEAMLESS PIPE
ASME SB677/ASTM B677 TP904L/NO8904 STAINLESS STEEL SEAMLESS PIPE
Abstract of ASTM B677
This specification covers UNS N08925, N08354, and N08926 alloy seamless, cold-worked or hot-finished pipes and tubes for use in general corrosive service. The materials should be supplied in solution-treated condition, heat treated and quenched in water or rapidly cooled by other means. The material chemical composition, mechanical properties, and required response to hydrostatic and nondestructive tests should conform to the values contained in this specification and related ASTM standards.
SS904L PIPE
SS904L 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.
Stainless Steel 904L Pipes are a non-stabilized low carbon high alloy austenitic stainless steel. 904L Stainless Steel Pipes is widely used in applications where the corrosion properties of 316L and 317L are not adequate. SS904L Pipe performs better than other austenitic stainless steels tubing due to the higher alloying of nickel and molybdenum. SS 904 Pipes products are extensively brought up into some common application such as in Pulp and Paper Industry, Heat exchangers, Condensers, Chemical equipment, Sea water equipment, Pharmaceutical equipment and others.
Chemical Composition
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Cu |
|
|
904L |
min. |
- |
- |
- |
- |
- |
19.0 |
4.0 |
23.0 |
1.0 |
Mechanical Properties
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. |
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Typical Physical Properties
Grade |
Density |
Elastic Modulus |
Mean Co-eff of Thermal Expansion (m/m/C) |
Thermal Conductivity |
Specific Heat 0-100C |
Elec Resistivity |
|||
|
0-100C |
0-315C |
0-538C |
At 20C |
At 500C |
|||||
|
904L |
8000 |
200 |
15 |
- |
- |
13 |
- |
500 |
850 |
Grade Specifications for 904L grade stainless steels.
Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
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|
BS |
En |
No |
Name |
||||
|
904L |
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. |
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Possible Alternative Grades to S904L
| 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. |
Supplementary Testing:
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Applications
- Typical applications include
- Processing plant for sulphuric, phosphoric and acetic acids
- Pulp and paper processing
- Components in gas scrubbing plants
- Seawater cooling equipment
- Oil refinery components
- Wires in electrostatic precipitators
