JIS G3461 13CrMo44 Boiler Tube
Boiler tube is a type of seamless tube. The manufacturing method is the same as that of seamless pipes, but there are strict requirements for the type of steel used in manufacturing steel pipes. According to the operating temperature, it is divided into two types: general boiler tubes and high-pressure boiler tubes.
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Boiler tubes refer to steel materials that are open at both ends and have hollow sections with a large length relative to the surrounding area. According to the production method, they can be divided into seamless steel tubes and welded steel tubes. The specifications of the steel tubes are determined by the external dimensions (such as outer diameter or side length) and Wall thickness is expressed in a wide range of sizes, from capillary tubes with very small diameters to large diameter tubes with diameters of several meters. Steel pipes can be used in pipelines, thermal equipment, machinery industry, petroleum geological exploration, containers, chemical industry and special purposes.
Manufacture:Seamless process
Out Dimensions: 14mm-711mm
Wall Thickness: 2mm-60mm
Length: Fixed(6m,9m,12,24m) or normal length(5-12m)
Ends: Plain End, Beveled End, Treaded
Heat treatment temperature of 13CrMo44 Seamless Steel Tubes
| Steel Grade | Thermal processing ℃ | Normalizing℃ | Tempering | ||
| Grade | Material number | Quenching temperature ℃ | Tempering temperature ℃ | ||
| 13CrMo44 | 1.7335 | 1100 to 850°C | - | 910-940 | 660-730 |
Chemical composition of 13CrMo44 Seamless Pipe
| Standard:DIN 17175 | grade | Chemical composition | |||||
| C | Si | Mn | P,S | Cr | Mo | ||
| 13CrMo44 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.030 | 0.70-1.10 | 0.45-0.65 | |
Mechanical property of 13CrMo44 Seamless Tube
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| DIN 17175 | 13CrMo44 | 440-590 | ≥290 | ≥20 |
Dimensions Tolerance of 13CrMo44 Steel Pipe
| Project | Standard | Size range | Tolerance | |||
| Outer diameter | DIN17175 | Hot rolled steel pipe | OD ≤ 100mm | ± 0.75%( Min ± 0.5mm ) | ||
| OD＞ 100~ 320mm | ± 0.9% | |||||
| Cold drawn steel pipe OD ≤ 120mm | ± 0.6%( Min ± 0.25mm ) | |||||
| Wall thickness | DIN17175 | OD ≤ 130mm | WT ≤ 2Sn | +15%~-10% | ||
| WT ＞ 2Sn~4Sn | +12.5%~-10% | |||||
| WT ＞ 4Sn | ± 9% | |||||
| 130 ＜ OD ≤ 320mm | WT ≤ 0.05OD | +17.5%~-12.5% | ||||
| 0.05OD ＜ WT ≤ 0.11OD | ± 12.5% | |||||
| WT ＞ 0.11OD | ± 10% | |||||
JIS G3461 Seamless Boiler Tubes Chemical Composition:
| Grade | Mfg.
Process |
Chemical Composition (%) | ||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Others | ||
| STB35 | S, E | 0.18Max | 0.35Max | 0.30~0.60 | 0.035Max | 0.035Max | - | - | - | - |
| STB42 | S, E | 0.32Max | 0.35Max | 0.30~0.60 | 0.035Max | 0.035Max | - | - | - | - |
| STB52 | S, E | 0.25Max | 0.35Max | 1.00~1.50 | 0.035Max | 0.035Max | - | - | - | - |
Boiler Steel Pipe Mechanical Properties:
| Symbol of class | Tensile strength
N/mm2 {kgf/mm2} |
Yield point or proof stress N/mm2 {kgf/mm2} |
Elongation % | ||
| Outside diameter 20mm or over | Outside diameter 10mm or over to and excl. 10mm | Outside diameter under 10mm | |||
| No. 11 test piece No. 12 test piece | No. 11 test piece | No. 11 test piece | |||
| STB340
STB410 STB510 |
340{35}min.
410{42} min. 510{52} min. |
175{18} min.
255{26} min. 295{30} min. |
35 min.
25 min. 25 min. |
30 min.
20 min. 20 min. |
27 min.
17 min. 17 min. |
Boiler Steel Tube Manufacture Method:
| Symbol of class | 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 340 | As manufactured, as required, low temperature annealing or normalizing may be performed. | Low temperature annealing, normalizing or full annealing. | Normalizing | As manufactured. However, as required, low temperature annealing or normalizing may be performed. | Normalizing |
| STB 410 | As manufactured. However, as required, low temperature annealing or normalizing may be performed. | Low temperature annealing, normalizing or full annealing. | Normalizing | Low temperature annealing | |
| STB 510 | Normalizing | ||||
GNEE JIS G3461 13CrMo44 Boiler Tube And Pipe
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