JIS G 3462 Alloy Steel Seamless Tubes For Heat Exchanger / Boiler STBA 12 STBA 13 STBA 20
JIS G 3462 STBA 12 STBA 13 STBA 20 STBA 22 STBA23 STBA 24 STBA 25 STBA 26 Alloy Steel Boiler and Heat Exchanger
JIS G 3462 Alloy steel boiler and heat exchanger
Standard:JIS G 3462
Wall thickness 0.5-50mm Diameter 5-420mmLength Upon request
Application: for boiler and heat exchanger
Produce method:
STBA 12,STBA13,STBA20,,STBA 22 :electric resistant welding
STBA 25 STBA 26 :Seamless
Heat treatment:
STBA 12,STBA13:Low temperature annealing,
isothermal annealing, full annealing,
normalizing followed by tempering.
STBA 20 STBA22: Low temperature annealing,
isothermal annealing, full annealing,
normalizing followed by tempering.
STBA 23 STBA 24 STBA 25 STBA 26:Isothermal annealing,
full annealing followed by tempering.
| CHEMICAL COMPOSITION % max | |||||||
| Steel grade | C | Si | Mn | P | S | Cr | Mo |
| STBA 12 | 0.10-0.20 | 0.10-0.50 | 0.30-0.80 | 0.035 | 0.035 | - | 0.45-0.65 |
| STBA 13 | 0.15-0.25 | 0.10-0.50 | 0.30-0.80 | 0.035 | 0.035 | - | 0.45-0.65 |
| STBA 20 | 0.10-0.20 | 0.10-0.50 | 0.30-0.60 | 0.035 | 0.035 | 0.50-0.80 | 0.45-0.65 |
| STBA 22 | 0.15 | 0.5 | 0.30-0.60 | 0.035 | 0.035 | 0.80-1.25 | 0.45-0.65 |
| STBA 23 | 0.15 | 0.50-1.00 | 0.30-0.60 | 0.035 | 0.030 | 1.00-1.50 | 0.45-0.65 |
| STBA 24 | 0.15 | 0.5 | 0.30-0.60 | 0.035 | 0.030 | 1.90-2.60 | 0.87-1.13 |
| STBA 25 | 0.15 | 0.5 | 0.30-0.60 | 0.035 | 0.030 | 4.00-6.00 | 0.45-0.65 |
| STBA 26 | 0.15 | 0.25-1.00 | 0.30-0.60 | 0.035 | 0.030 | 8.00-10.00 | 0.9-1.10 |
| MECHANICAL PROPERTIES min | |||||
| Steel Grade | Tensile Strength Mpa | Yeild point or proof stress Mpa | Elongation % | ||
| OD 20mm and over | OD 10mm or over to and excl. 20mm | OD up to 10mm | |||
| STBA 12 | 380 | 205 | 30 | 25 | 22 |
| STBA 13 | 410 | 205 | 30 | 25 | 22 |
| STBA 20 | 410 | 205 | 30 | 25 | 22 |
| STBA 22 | 410 | 205 | 30 | 25 | 22 |
| STBA 23 | 410 | 205 | 30 | 25 | 22 |
| STBA 24 | 410 | 205 | 30 | 25 | 22 |
| STBA 25 | 410 | 205 | 30 | 25 | 22 |
| STBA 26 | 410 | 205 | 30 | 25 | 22 |
| Hardness | |
| Steel Grade | Rockwell hardness HRB(Mean value of three points) |
| STBA 12 | 80max |
| STBA 13 | 81max |
| STBA 20 | 85max |
| STBA 22 | 85max |
| STBA 23 | 85max |
| STBA 24 | 85max |
| STBA 25 | 85max |
| STBA 26 | 89max |
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