JIS G3454 Steel Pipes , JIS G3454 Pipes for Pressure Service

JIS G3454 Steel Pipes , JIS G3454 Pipes for Pressure Service , JIS G 3454 STPG 370 CARBON STEEL PIPE

This Japanese Industrial Standard specifies the carbon steel pipes, hereinafter referred to as the "pipes", used for pressure service at an approximate maximum temperature of
350℃. The pipes for high pressure service shall be in accordance with JIS G 3455.  

JIS G3454 Steel Pipes - JIS G3454 Pipes for Pressure Service

2. Grade and Designation

The pipe shall be classified into two grades and their letter symbols shall be as given in Table 1-1 or Table 1-2.
Table1

World standard comparative table

3. Method of Manufacture.

The Method of manufacture shall be as follows:
3.1 The pipe shall be manufactured by either the seamless of the electric resistance welding process.
3.2 (Applicable till the end of 1990) The pipe shall stay as manufactured. However, the cold- finished steel pipe shall be annealed after manufacture. The purchaser may specify heat treatment for the weld of the electric resistance welded steel pipe of grade STPG 42, as necessary.

4. Chemical Composition

The pipe shall be tested in accordance with 9.1 and the ladle analysis values obtained shall conform to Table 2-1 or Table 2-2.
Table 2

5. Mechanical Properties

5.1 Tensile Strength, Yield Point or Proof Stress and Elongation
The pipe shall be tested in accordance with 9.2 and the tensile strength, yield point or proof stress and elongation obtained shall comply with Table 3-1

Remarks.
1. When the tensile test is carried out for No. 12 or No.5 test piece for the pipe under 8mm in wall thickness, the minimum value of elongation shall be obtained by subtracting
1.5% from the values of elongation given in Table 3-1 for each 1 mm decrease in wall thickness, and rounding off to an integer in accordance with JIS Z 8401. Examples of calculation are given in Informative Reference Table1.
2. The values of elongation given in Table 3-1 shall not be applied to the pipe whose nominal diameter is 25A or smaller. However, the value of elongation shall be recorded.
3. In sampling the tensile test pieces from the electric resistance welded steel pipe, NO.12 or No.5 test piece shall be taken from the portion not involving welded seams.
Informative Reference Table 1.
Examples of Elongation Values Calculated for No.12 test piece (longitudinal) and No.5 test piece (transverse)taken from pipes under 8mm in wall thickness

5.2 Flatness
When tested in accordance with 9.3, the pipe shall not generate flaws of cracks on its wall surface. In this case, the distance between the two plates shall be in accordance with the following formula:
In the case of seamless steel pipe :

In the case of of electric resistance welded steel pipe:
for weld = H=(2/3)D
for the portion without weld = H=(1/3)D
where
H : distance between flattening plates (mm)
t : wall thickness of pipe (mm)
D :outside diameter of pipe (mm)
e : constant individual defined for each grade of pipe
0.08 for STPG 370
0.07 for STPG 410
5.3 Bendability For the pipe whose nominal diameter is 40A or smaller, In the test of 9.4 the pipe shall ve free from the occurrence of flaws or cracks on its wall surface, In this case the pipe shall be vent through 90ì around an inside radius that is 6 times its outside diameter

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