Seamless, Cold-worked or Hot-finished pipe
and tube intended for general corrosive service.
Steel Grade: UNS N08904,UNS N08925,and UNS N08926
Materials and Manufacture:
The material is supplied in the solution-treated condition
Tests:
Chemical Analysis - One test per lot
Machanical Properties - One test per lot
Non-destructive Test - Each Piece in each lot
Average Diameter:
The average if the maximum and minimum outside diameters as determined at any one cross section of the tube or pipe
Pipe- Seamless tube conforming to the particular dimensions commerccially known as standard pipe sizes
Tube- a hollow products of round or any othjer cross section having a continuous periphery.
TABLE 1 Chemical Requirements
| Element | UNS N08904 | UNS N08925 | UNS N08925 | Product(check)Analysis Variations,under min or over max of the Specified Limit of Element,% |
| UNS N08904 UNS N08925 | UNS N08926 |
| Carbon,max | 0.020 | 0.020 | 0.020 | 0.005 | 0.005 |
| Manganese,max | 2.0 | 1.0 | 2.0 | 0.04 | 0.04 |
| Phosphorus,max | 0.045 | 0.045 | 0.03 | 0.005 | 0.005 |
| Sulfur,max | 0.035 | 0.030 | 0.01 | 0.005 | 0.003 |
| Silicon,max | 1.00 | 0.50 | 0.5 | 0.20 | 0.03 |
| Nickel | 23.0 to 28.0 | 24.0 to 26.0 | 24.0 to 26.0 | 0.20 | 0.25 |
| Chromium | 19.0 to 23.0 | 19.0 to 21.0 | 19.0 to 21.0 | 0.20 | 0.25 |
| Molybdenum | 4.0 to 5.0 | 6.0 to 7.0 | 6.0 to 7.0 | 0.10 | 0.15 |
| Copper | 1.0 to 2.0 | 0.8 to 1.5 | 0.5 to 1.5 | 0.10 | 0.04 |
| Nitrogen | … | 0.1 to 0.2 | 0.15 to 0.25 | … | 0.01 |
| IronA | balance | balance | balance | … | … |
Tests and Report:
Mechanical Test and Chemical Analysis Report EN10204 3.1 B
Non-Destructive Test:
a. Hydraostatict Test- Usually we use Eddy Current Test and Ultrosonic Test instead
b. Visual Examincation
TABLE 2 Mechanical Properties of Pipe and Tube
| Alloy | Temper | TensileStrength, min,psi(MPa) | YieldStrength,0.2% offset,min,psi(MPa) | Elongation in 2 in.or 50 mm(or 4D),min,% |
| UNS N08904 | Solution annealed | 71(490) | 31(220) | 35 |
| UNS N08925 | Solution annealed | 87(600) | 43(300) | 40 |
| UNS N08926 | Solution annealed | 94(650) | 43(295) | 35 |
Reference Documents:
A 450/A450M Specifications for General Requirements for Carbon, Ferritic Alloy, Austenitic Alloy Steel Tubes
E 8 Test Methods for Tension Testing of Metallic Materials
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with specifications
E 354 Test Methods for Chemical Analysis o High Temperature, Electrical , Magnetic , and Other Similar Iron, Nickel, and Cobalt Alloys
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