Details of Seamless Alloy Steel Pipe :
| Material: | Alloy Steel | Steel Grade: | STBA 12 STBA 13 STBA 20 STBA 22 STBA23 STBA 24 STBA 25 STBA 26 Etc |
| Produce Method: | Electric Resistant Welding And Seamless | Heat Treatment: | Annealing, Isothermal Annealing, Full Annealing Etc |
| Standard: | JIS G3462 | Application: | For Boiler And Heat Exchanger |
| Relevant Standard: | KS D 3572 ASTM A 161 A209 A213 A199 DIN 17175 BS 3059 |
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 for Seamless Alloy Steel Pipe :JIS G 3462
Wall thickness 0.5-50mm Diameter 5-420mm Length Upon request
Application of Seamless Alloy Steel Pipe: for boiler and heat exchanger
Seamless Alloy Steel Pipe Produce method:
STBA 12,STBA13,STBA20,,STBA 22 :electric resistant welding
STBA 25 STBA 26 :Seamless
Heat treatment of Seamless Alloy Steel Pipe:
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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Product Categories : Seamless Alloy Steel Tubes
QUALITY CONTROL
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.
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Boiler / Heat Exchanger Seamless Steel Tube Round Shape With Od 3 - 420mm Images
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