JIS Standards
Boiler and Heat Exchanger Steel Tube
Standard
JIS G3461
JIS G3462
Application
It is used for boiler and heat exchanger inside & outside tube.
Main Steel Tube Grades
STB340, STB410, STB510, STBA12, STBA13, STBA20, STBA22, STBA24
Chemical Composition
| Standard | Steel Grade | Chemical Composition % | ||||||
| C | Si | Mn | P | S | Cr | Mo | ||
| JIS G3461 | STB340 | ≤0.18 | ≤0.35 | 0.30-0.60 | ≤0.035 | ≤0.035 | / | / |
| STB410 | ≤0.32 | ≤0.35 | 0.30-0.80 | ≤0.035 | ≤0.035 | / | / | |
| STB510 | ≤0.25 | ≤0.35 | 1.00-1.50 | ≤0.035 | ≤0.035 | / | / | |
| JIS G3462 | STBA12 | 0.10-0.20 | 0.10-0.50 | 0.30-0.80 | ≤0.035 | ≤0.035 | / | 0.45-0.65 |
| STBA13 | 0.15-0.25 | 0.10-0.50 | 0.30-0.80 | ≤0.035 | ≤0.035 | / | 0.45-0.65 | |
| STBA20 | 0.10-0.20 | 0.10-0.50 | 0.30-0.60 | ≤0.035 | ≤0.035 | 0.50-0.80 | 0.40-0.65 | |
| STBA22 | ≤0.15 | ≤0.50 | 0.30-0.60 | ≤0.035 | ≤0.035 | 0.80-1.25 | 0.45-0.65 | |
| STBA24 | ≤0.15 | ≤0.50 | 0.30-0.60 | ≤0.030 | ≤0.030 | 1.90-2.60 | 0.87-1.18 | |
Mechanical Properties
| Standard | Steel Grade | Mechanical Properties | ||
| Tensile Strength MPa | Yield Strength MPa | Elongation % | ||
| JIS G3461 | STB340 | ≥340 | ≥175 | ≥35 |
| STB410 | ≥410 | ≥255 | ≥25 | |
| STB510 | ≥510 | ≥295 | ≥25 | |
| JIS G3462 | STBA12 | ≥380 | ≥205 | ≥30 |
| STBA13 | ≥410 | ≥205 | ≥30 | |
| STBA20 | ≥410 | ≥205 | ≥30 | |
| STBA22 | ≥410 | ≥205 | ≥30 | |
| STBA24 | ≥410 | ≥205 | ≥30 | |
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