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Yosun (Tianjin) Piping Engineering Co., Ltd. is one of the most credible manufacturers and suppliers of martensitic stainless steel tubing in China. Please feel free to wholesale customized martensitic stainless steel tubing at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.
Number of Tubes in a Lot Heat Treated by the Continuous Process
|
Size of Tube
|
Size of Lot
|
|
2 in. [50.8 mm] and over in outside diameter and
0.200 in. [5.1 mm] and over in wall thickness
|
not more than 50 tubes
|
|
Less than 2 in. [50.8 mm] but over 1 in. [25.4 mm]
in outside diameter or over 1 in. [25.4 mm] in
outside diameter and under 0.200 in. [5.1 mm] in
wall thickness
|
not more than 75 tubes
|
|
1 in. [25.4 mm] or less in outside diameter
|
not more than 125 tubes
|
Minimum Elongation Values
|
Wall Thickness
|
ElongationA in 2 in.
or 50 mm, min, %
|
|||
|
in.
|
mm
|
TP446–1
and
S 4473 5
|
S41500
|
All Other
Grades
|
|
5⁄16 [0.312]
|
8 | 18 | 15 | 20 |
|
9⁄32 [0.281]
|
7.2 | 17 | 14 | 19 |
|
1⁄4 [0.250]
|
6.4 | 16 | 14 | 18 |
|
7⁄32 [0.219]
|
5.6 | 15 | 13 | 17 |
|
3⁄16 [0.188]
|
4.8 | 14 | 12 | 16 |
|
5⁄32 [0.156]
|
4 | 13 | 11 | 15 |
|
1⁄8 [0.125]
|
3.2 | 13 | 11 | 14 |
|
3⁄32 [0.094]
|
2.4 | 12 | 10 | 13 |
|
1⁄16 [0.062]
|
1.6 | 11 | 9 | 12 |
|
0.062–0.035, excl
|
1.6-0.9 | 10 | 8 | 12 |
|
0.035–0.022, excl
|
0.9-0.6 | 10 | 8 | 11 |
|
0.022–0.015, incl
|
0.6-0.4 | 10 | 8 | 11 |
ACalculated elongation requirements shall be rounded to the nearest whole number.
Note-The above table gives the computed minimum values for each 1⁄32 in. [0.8 mm] decrease in wall thickness. Where the wall thickness lies between two values shown above, the minimum elongation value shall be determined by the following equation:
Mechanical Tests Required
1.Tension Tests-One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes.
2.Flaring Test (for Seamless Tubes)- One test shall be made on specimens from one end of one tube from each lot of finished tubes. The minimum expansion of the inside diameter shall be 10 %. For tubes over 8 in. [203.2 mm] in outside diameter, or tubes with wall thickness 3⁄8 in. [9.52 mm] and
over, the flattening test may be performed instead of the flaring test unless the flaring test is specified in the purchase order.
3.Flange Test (for Welded Tubes)- One test shall be made on specimens from one end of one tube from each lot of finished tubes. For tubes over 8 in. [203.2 mm] in outside diameter, or tubes with wall thickness 3⁄8 in. [9.52 mm] and over, the flattening test may be performed instead of the flange
test unless the flange test is specified in the purchase order.
4.Hardness Test-Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot.
5.When more than one heat is involved, the tension, flaring, flanging, and hardness test requirements shall apply to each heat.
6.Reverse Flattening Test-For welded tubes, one reverse flattening test shall be made on a specimen from each 1500 ft [450 m] of finished tubing.
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