Specifications

JIS G3455 Carbon Steel Pipes for High Pressure Service
Grade STS 370
Grade STS 410
Grade STS 480

  

JIS G3455 Carbon Steel Pipes for High Pressure Service

1. Scope
This Japanese Industrial Standard specifies the carbon steel pipes, hereinafter referred to as the "pipes" , used for high pressure service at an approximate maximum temperature
of 350°
Remarks
1.1 With the previous agreement of the manufacturer, the purchaser may designate part or all of the supplementary quality requirements Z2, Z3 ,Z4 and Z5 specified in this text.
Appendix Z 2: Elevated Temperature Yield Point or Proof Stress
Appendix Z 3: Ultrasonic Examination
Appendix Z 4: Eddy Current Examination
Appendix Z 5: Charpy Impact Test
1.2 The units and numerical values given un { } in this Standard are based on the International System of Units (SI) and are appended for informative reference.
Further, the traditional units accompanied by numerical values in this Standard shall be converted to the SI units and numerical values on Jan. 1, 1991.

2. Grade and Designation
The pipe shall be classified into three grades and their letter symbols shall be as given in Table 1.

Letter symbol of grade	(Informative reference) Traditional symbol
STS 370	STS 38
STS 410	STS 42
STS 480	STS 49

3. Method of Manufacture
Appearance shall be as follows:
3.1 The pipe shall be manufactured from killed steel by the seamless process
3.2 The pipe shall be subjected to the heat treatment specified in Table 5-1 of Table 5-2. The heat treatment other than those specified in Table 5-1 of Table 5-2 shall be agreed upon by the purchaser and the manufacturer. Table 2

Letter symbol of grade	Hot-finished seamless steel pipe	Cold-finished seamless steel
STS 370	As manufactured. However, low temperature annealing of normalizing	Low temperature annealed of normalized
STS 410
STS 480	Low temperature annealed of normalized

3.3 When required by the purchaser, the pipe may be furnished with a bevel end.

4. Chemical Composition
The pipe shall be tested in accordance with 9.1 and the resulting ladle analysis values obtained shall conform to Table 3.

Letter symbol of grade	Elongation %
	C	Si	Mn	P	S
STS 370	0.25 max.	0.10~0.35	0.30~1.10	0.035 max.	0.035 max.
STS 410	0.30 max.	0.10~0.35	0.30~1.40	0.035 max.	0.035 max.
STS 480	0.33 max.	0.10~0.35	0.30~1.50	0.035 max.	0.035 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 of proof stress and elongation of the pipe obtained shall comply with Table 4.

Letter symbol of grade	Mechanical Properties
	Tensile strength	Yield point of proof	Elongation %
	kgf/mm2 {N/mm2}	kgf/mm2 {N/mm2}	No.11 and No.12 test	No. 5 test piece	No. 4 test piece
			Longi-tudinal	Trans- tudinal	Longi- tudinal	Trans- tudinal
STS 370	38 {373} min.	22{216} min.	30 min.	25 min.	23 min.	28 min.
STS 410	42{412} min.	25{245} min.	25 min.	20 min.	19 min.	24 min.
STS 510	49{481} min.	28{275} min.	25 min.	20 min.	17 min.	22 min.

6. Dimensions, Weight and Dimensional Tolerances
6.1 Dimensions and Weight
The outside diameter, wall thickness and mass of the pipe shall be as specified in Attached Table 5.
6.2 Dimensional Tolerances
The tolerances on the outside diameter, wall thickness and wall thickness deviation of the pipe shall conform to Table5.
In the case where the pipe length is designated, the value shall be the minimum length.

Table 5. Tolerances on Outside Diameter, Wall Thickness and Wall Thickness Deviation

Division	Tolerances on outside diameter	Tolerances on wall	Tolerances on wall thickness
Hot-finished seamless steel	50mm Under: ≤0.5mm	≤4mm Under +0.6mm -0.5mm ≤4mm or over +15% -12.5%	Within 20% of wall thickness
	50mm and up to 200mm: ≤1.6mm
	200mm and over: ≤ 8%
	For the pipe 350mm of over, the tolerances on outside diameter may be determined by the measurement of the length of circumference. Shall be ≤0.5%
Cold-finished seamless steel pipe	40mm Under: ≤0.3mm	2mm Under: ≤0.2mm	-
	40mm and over: ≤ 0.8%	2mm and over: ≤10%