Seamless Steel Tubes for High Pressure Boilers, produced according to GB5312-1999
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This tube is used for ship pressure pipe system, boiler and superheater. The seamless carbon steel and carbon manganese steel tube can be divided into seamless pressure pipe and seamless boiler and superheater pipe, according to the Chinese standard GB5312-1999.
Ship with seamless carbon steel and carbon manganese steel tube, produced according to Chinese Standard GB5312-1999.
GB5312-1999, a standard applies to the production of seamless carbon steel and carbon manganese steel tube used for ship pressure pipe system, boiler and superheater
Feature for seamless carbon steel pipe: Seamless carbon steel and carbon manganese steel pipe used for ship pressure pipe system, boiler and superheater (Seamless high pressure boiler tube)
Application of seamless carbon manganese steel tube: For ship pressure pipe system, boiler and superheater (Seamless high pressure boiler tube)
Produce method for seamless high pressure boiler tube: Hot rolling(extrusion), cold drawn
The seamless carbon steel tubes` material/Steel grade: 320/360/410/460/490 and so on.
Chemical composition of seamless carbon manganese steel pipe:
| Steel Grade | Chemical composition |
| C | Si | Mn | S | P | Cr | Mo | Ni | Cu | Total |
| 320 | ≤0.16 | ≤0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.10 | ≤0.30 | ≤0.30 | ≤0.70 |
| 360 | ≤0.17 | ≤0.35 | 0.40-0.80 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.10 | ≤0.30 | ≤0.30 | ≤0.70 |
| 410 | ≤0.21 | ≤0.35 | 0.40-1.20 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.10 | ≤0.30 | ≤0.30 | ≤0.70 |
| 460 | ≤0.22 | ≤0.35 | 0.80-1.40 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.10 | ≤0.30 | ≤0.30 | ≤0.70 |
| 490 | ≤0.23 | ≤0.35 | 0.80-1.50 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.10 | ≤0.30 | ≤0.30 | ≤0.70 |
Seamless carbon steel pipes' Mechanical Properties :
| Steel Grade | Tensile Strength MPa | Yield Strength MPa | Elongation % |
| 320 | 320-440 | ≥195 | ≥25 |
| 360 | 360-480 | ≥215 | ≥24 |
| 410 | 410-530 | ≥235 | ≥22 |
| 460 | 460-580 | ≥265 | ≥21 |
| 490 | 490-610 | ≥285 | ≥21 |
Tolerance of seamless carbon steel & carbon manganese steel pipe:
1. Tolerance of the OD &WT:
| Production Method | Size(mm) | Tolerance |
| Hot Rolling(Extrusion) | OD | ≤159 | ±1.0%(min.±0.50mm) |
| ＞159 | ±1.25% |
| WT | ≤20 | +15%(min.+0.45mm) -10%(min. -0.30mm) |
| ＞20 | ±10% |
| D≥351 | ±15% |
| Cold Drawn | OD | ≤30 | ±0.20mm |
| 30~50 | ±0.30mm |
| ＞50 | ±0.8% |
| WT | 1.5~3 | +12.5% -10% |
| ＞3.0 | ±10% |
2.Bending tolerance for seamless high pressure boiler pipe:
WT≤15 mm, Bending≤1.5mm/m
WT＞15~30 mm, Bending≤2.0mm/m
D≥351 mm, Bending≤3.0mm/m
3. End shape of the high presssure boiler tube:
Both ends of the pipe should be cut to a complete end surface perpendicular to the axis, and remove burrs
4.Delevery condition for the seamless carbon manganese tube:
Normalized(NBK) or Normalized and tempered
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