JIS G3467 Boiler Tube Specifications
JIS G3467 boiler tubes are widely used in the petrochemical industry for heating fluids in open-fire heaters, such as boilers. These tubes are available in various materials, including carbon steel, alloy steel, stainless steel, and nickel-chromium iron alloys. They are designed to meet strict mechanical and dimensional requirements to ensure reliability and performance under high-temperature conditions.
Mechanical Properties:
| Class Symbol |
Finish Type |
Tensile Strength
N/mm²
{kgf/mm²}
|
Yield Point or Proof Stress
N/mm²
{kgf/mm²}
|
Elongation (%) |
| No. 11 Test Piece
No. 12 Test Piece
|
No. 5 Test Piece |
No. 4 Test Piece |
| Longitudinal Direction |
Transverse Direction |
Longitudinal Direction |
Transverse Direction |
| STF 410 |
- |
410 min {42} |
245 min {25} |
25 min |
20 min |
24 min |
19 min |
| STFA 12 |
- |
380 min {39} |
205 min {21} |
30 min |
25 min |
24 min |
19 min |
| STFA 22 |
- |
410 min {42} |
205 min {21} |
30 min |
25 min |
24 min |
19 min |
| STFA 23 |
- |
410 min {42} |
205 min {21} |
30 min |
25 min |
24 min |
19 min |
| STFA 24 |
- |
410 min {42} |
205 min {21} |
30 min |
25 min |
24 min |
19 min |
| STFA 25 |
- |
410 min {42} |
205 min {21} |
30 min |
25 min |
24 min |
19 min |
Dimensional Tolerances:
| Nominal Diameter |
Outside Diameter (mm) |
Wall Thickness (mm) |
4.0 |
4.5 |
5.0 |
5.5 |
6.0 |
6.5 |
7.0 |
8.0 |
9.5 |
11.0 |
12.5 |
14.0 |
16.0 |
18.0 |
20.0 |
22.0 |
25.0 |
28.0 |
| A |
B |
| 50 |
2 |
60.5 |
5.57 |
6.21 |
6.84 |
7.46 |
8.06 |
8.66 |
9.24 |
10.4 |
11.9 |
 |
 |
 |
 |
 |
 |
 |
 |
| 65 |
2 1/2 |
76.3 |
 |
7.97 |
8.79 |
9.60 |
10.4 |
11.2 |
12.0 |
13.5 |
15.6 |
 |
 |
 |
 |
 |
 |
 |
 |
| 80 |
3 |
89.1 |
 |
9.39 |
10.4 |
11.3 |
12.3 |
13.2 |
14.2 |
16.0 |
18.6 |
21.2 |
 |
 |
 |
 |
 |
 |
 |
| 90 |
3 1/2 |
101.6 |
 |
10.8 |
11.9 |
13.0 |
14.1 |
15.2 |
16.3 |
18.5 |
21.6 |
24.6 |
27.5 |
 |
 |
 |
 |
 |
 |
| 100 |
4 |
114.3 |
 |
 |
13.5 |
14.8 |
16.0 |
17.3 |
18.5 |
21.0 |
24.6 |
28.0 |
31.4 |
34.6 |
 |
 |
 |
 |
 |
| 125 |
5 |
139.8 |
 |
 |
16.6 |
18.2 |
19.8 |
21.4 |
22.9 |
26.0 |
30.5 |
34.9 |
39.2 |
43.4 |
48.8 |
 |
 |
 |
 |
| 150 |
6 |
165.2 |
 |
 |
 |
21.7 |
23.6 |
25.4 |
27.3 |
31.0 |
36.5 |
41.8 |
47.1 |
52.2 |
58.9 |
65.3 |
 |
 |
 |
| 200 |
8 |
216.3 |
 |
 |
 |
 |
 |
33.6 |
36.1 |
41.1 |
48.4 |
55.7 |
62.8 |
69.8 |
79.0 |
88.0 |
96.8 |
105 |
 |
| 250 |
10 |
267.4 |
 |
 |
 |
 |
 |
41.8 |
45.0 |
51.2 |
60.4 |
69.6 |
78.0 |
87.5 |
99.2 |
111 |
122 |
133 |
149 |
165 |
These specifications are essential for ensuring that JIS G3467 boiler tubes meet the required standards for use in high-pressure and high-temperature environments. The mechanical properties listed provide a clear indication of the strength and ductility of each type of tube, while the dimensional tolerances ensure proper fit and function within the system. Engineers and technicians should refer to these tables when selecting the appropriate material for their specific application. Proper selection based on these standards can significantly enhance the efficiency and longevity of boiler systems.
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