JIS G3461 is a Japanese Industrial Standard (JIS) that specifies requirements for seamless steel tubes for boilers and heat exchangers. STB510 is a material grade defined within this standard, which typically refers to a carbon steel grade with specific chemical composition and mechanical properties suitable for use in boilers and heat exchangers operating at elevated temperatures and pressures.
JIS G3461 STB510 tubes are designed to withstand the corrosive and high-temperature environments encountered in boiler and heat exchanger applications. They are manufactured to meet strict standards for dimensions, wall thickness, material composition, and mechanical properties, ensuring their ability to perform reliably under demanding conditions.
Heat Treatment of JIS G3461 STB 510
| Grade | Heat treatment | ||||
| Hot finished seamless steel tube | Cold finished seamless steel tube | Electric resistance welded steel tube other than hot finished or cold finished steel tube | Finished electric resistance welded steel tube | Fold finished electric resistance welded steel tube | |
| STB 510 | Normalizing | ||||
Note:The cold finished electric resistance welded steel tube which has been normalized prior to cold finishing may be finished by annealing.
Chemical Composition of JIS G3461 STB 510
| Standard:JIS G3461 | Grade | Chemical Composition Limits (%) | ||||
| C | Si | Mn | P | S | ||
| STB 510 | ≤ 0.25 | ≤ 0.35 | 1.00-1.50 | ≤ 0.035 | ≤ 0.035 | |
Mechanical Properties of JIS G3461 STB 510
| Grade | Tensile Property (N/mm2) | Yield Point or Yield Strength (N/mm2) | Rockwell hardness HRB | Elongation (%) | ||
| OD ≥20 mm | 10 mm ≤OD ＜20 mm | OD ＜10 mm | ||||
| Longitudinal | Transverse | Transverse | ||||
| STB 510 | ≥ 510 | ≥ 295 | 92 max. | ≥ 25 | ≥ 20 | ≥ 17 |
Note:The above table is only applicable for heat exchanger carbon steel tubes. The buyer can appoint the upper limit value of tensile strength. The upper limit value of tensile strength is the above shown value plus 120 N/mm2.
