Seamless 20# Carbon Steel Tube
20# steel pipe, generally 20 seamless steel pipe, the strength is slightly higher than 15 steel, rarely quenched, no temper brittleness.
Chemical Composition of JIS G3461 STB 510 pipe
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 |
Note:Where required by the purchaser, Si may be designated as 0.10 to 0.35%.
Mechanical Properties of JIS G3461 STB 510 steel pipe
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.