Product Description
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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