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 |
