DIN 17175 St 35.8 heat-resistant steel seamless pipe, also known as heat-strong (literally "heat-resistant and high-strength") pipe, is a piping material with excellent performance in high-temperature environments. These pipes are widely used in the process flows of industries such as petroleum, chemical, electric power, and metallurgy, undertaking the important task of transmitting high-temperature fluids. DIN17175-1979 is a German industrial standard that specifies the technical requirements and inspection methods for heat-resistant steel seamless pipes.
Applications:
These pipes are commonly used in the construction of boilers, superheaters, heat exchangers, and other pressure vessels. They are also used in the oil and gas industry, chemical processing plants, and other industrial settings where high-pressure and high-temperature conditions are encountered.
St35.8 Boiler Tubes Chemistry Composition
| Material | C | Si | Mn | P | S |
| St 35.8 | ≤0.17 | 0.10-0.35 | 0.40-0.80 | ≤0.040 | ≤0.040 |
St35.8 heat-resistant tubes Mechanical Properties
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % |
| 360-480 | 235 min | 25 min |
Testing of ST 35.8 Steel Boiler Tubes
Tensile test
Notch impact/bending test
Ring test
Non-destructive test
Visual inspection of tube surface
Gauging
Leakage test
Grade identification test
Hot tensile test
DIN17175 ST 35.8 seamless steel tubes Factory
