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 several materials, including carbon steel, alloy steel, stainless steel, and nickel-chromium iron alloys. Each type is designed to meet specific mechanical and dimensional requirements based on its application.
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 |
Dimension Tolerance:
| 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 |
JIS G3467 boiler tubes are essential in high-temperature and high-pressure environments due to their excellent mechanical properties and precise dimensional tolerances. The material selection depends on the operating conditions, with carbon steel suitable for moderate applications and stainless or alloy steels preferred for more demanding environments. Proper understanding of these specifications ensures that the right tube is selected for optimal performance and safety in industrial systems.
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