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JIS G3454 Steel Pipes , JIS G3454 Pipes for Pressure Service

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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

JIS G3454 Steel Pipes - JIS G3454 Pipes for Pressure Service

)Material:STPG370,STPG380
)Specification
   OD:21.3mm-914.4mm
   WT:2mm-50mm
)Standard:JIS G 3454
)Length:5.8m-12m

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

Letter symbol of grade

(Informative reference) Traditional letter symbol of glade

STPG 370

STPG 38

STPG 410

STPG 42

World standard comparative table

KS

ASTM

JIS

DIN

BS

Grade Number

GRADE

Grade Number

GRADE

Grade Number

GRADE

Grade Number

GRADE

Grade Number

GRADE

D 3562

SPPS 370

SPPS 38

A 53

A 135

Gr A Gr A

G-3454

STPG 370 (STPG 38)

1626

1628

1629

1630

17172

St 37.0

St 37.4

St 37.0

St 37.4

StE240.7

3601

778

ERW 360

S 360

HFS 22

CDS 22

ERW 22

 

API

Grade Number

GRADE

5L

Gr A

Gr B

5L

X 42

X 52

X 56

X 60

X 65

X 70

X 80

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

Letter symbol of grade

Elongation %

Letter symbol of grade

C

Si

Mn

P

S

STPG 370

0.25 max.

0.35 max.

0.30 to 0.90

0.040 max.

0.040 max.

STPG 410

0.30 max.

0.35 max.

0.30 to 1.00

0.040 max.

0.040 max.

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

Letter symbol of grade

Table 3 Mechanical Properties

Letter symbol of grade

Tensile strength

Yield point or proof stress

Elongation %

Letter symbol of grade

kgf/mm2 {N/mm2}

kgf/mm2 {N/mm2}

No.11 and No.12 test pieces

No. 5 test pieces

No. 4 test piece

Letter symbol of grade

kgf/mm2 {N/mm2}

kgf/mm2 {N/mm2}

Longitudinal

Transverse

Longitudinal

Transverse

STPG 370

38 {373}min

22{216} min

30 min

25 min

23 min

28 min

STPG 410

42{412}min

25{245} min

25 min

20 min

19 min

24 min

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

Letter symbol of grade

shape of test piece

Elongation value relating to wall thickness %

Letter symbol of grade

shape of test piece

Over 7mm

to and excl.8mm

Over 6mm

to and excl7mm

Over 5mm

to and excl.6mm

Over 4mm

to and excl. 5mm

Over 3mm

to and excl. 4mm

Over 2mm

to and excl. 3mm

Over 1mm

to and excl. 2mm

STPG 370

No12 test piece

30

28

27

26

24

22

21

STPG 370

No5. test piece

25

24

22

20

19

18

16

STPG 410

No. 12 test piece

25

24

22

20

19

18

16

STPG 410

No 5. test piece

20

18

17

16

14

12

11

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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