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Seamless Steel Tubing DIN 17175 St35.8, St45.8 Heat resisting Tube
Stamdard: DIN17175
Main steel grades: St35.8, St45.8
Application: For high-pressure boilers(working pressure is generally 9.8 Mpa above, working temperature is between 450 °C and 650 °C) hot surface pipes, coal economizers, superheaters, reheaters, petrochemical industry etc.
Chemical Requirements & Mechanical Proterties:
| Grade | C | Si | Mn | P | S | Cr | Mo |
| St35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | ≤0.040 | / | / |
| St45.8 | ≤0.21 | 0.10-0.35 | 0.40-1.20 | ≤0.040 | ≤0.040 | / |
| Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation(%) |
| St35.8 | ≥235 | 360-480 | 25 |
| St45.8 | ≥255 | 410-530 | 21 |
Mark: As required.
Inspection and Test: chemical composition test, mechanical properties test(tensile, yield, elongation), process properties test(flatting, flaring, bending, hardness, impact, etc.), appearance and size test, non-destructive inspection test, hydrostastic test.
Delivery status: Annealed, normalized, normalized+Tempered, etc.
End: plain end, beveled end, threaded
End protection: plastic caps
Outside coating: black painting, anti-corrosion oil,galvanized finish, finish as per customer requirements.
Packing: Exporting package/wooden box /as requirement.
