# Introduction to DIN 17175 Alloy Steel Pipe Specifications
DIN 17175 alloy steel pipes are designed to withstand high temperatures and pressures, typically up to 600°C. These pipes are commonly used in the construction of boilers, pressure vessels, pipelines, and other critical equipment where durability and strength are paramount. Their ability to handle extreme conditions makes them indispensable in industries such as power generation, petrochemicals, and heavy engineering.
## Chemical Composition
The chemical composition of DIN 17175 steel pipes varies depending on the specific grade, ensuring that each type meets the requirements for its intended application. Below is a detailed breakdown of the key elements found in these pipes:
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Others |
|------------------|-----|-------|----------|-------|-------|----|---------|--------|---------------|
| 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 | - | - | - | - |
| 17Mn4 | 0.14-0.20 | 0.20-0.40 | 0.90-1.20 | ≤0.040 | ≤0.040 | - | ≤0.30 | - | - |
| 19Mn5 | 0.17-0.22 | 0.30-0.60 | 1.00-1.30 | ≤0.040 | ≤0.040 | - | ≤0.30 | - | - |
| 15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.80 | ≤0.035 | ≤0.035 | - | - | 0.25-0.35 | - |
| 13CrMo910 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | - | 0.70-1.10 | 0.45-0.65 | - |
| 10CrMo910 | 0.08-0.15 | ≤0.50 | 0.40-0.70 | ≤0.035 | ≤0.035 | - | 2.00-2.50 | 0.90-1.20 | - |
| 14MoV63 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | ≤0.035 | ≤0.035 | - | 0.30-0.60 | 0.50-0.70 | V: 0.22-0.32 |
| X20CrMoV121 | 0.17-0.23 | ≤0.50 | 0.40-0.70 | ≤0.030 | ≤0.030 | 0.30-0.80 | 10.00-12.50 | 0.80-1.20 | V: 0.25-0.35 |
These grades offer a wide range of mechanical properties, making them suitable for various industrial applications. The precise control over chemical composition ensures reliability under demanding conditions.
## Mechanical Properties
The mechanical properties of DIN 17175 steel pipes play a crucial role in their performance. Here’s an overview of the yield strength and tensile strength for different grades:
| Grade | Material Number | Min Yield Point (MPa) | Tensile Strength (MPa) |
|------------------|-----------------|-----------------------|------------------------|
| St35.8 | 1.0305 | 235 | 360-480 |
| St45.8 | 1.0405 | - | 410-530 |
| 17Mn4 | 1.0481 | - | 460-580 |
| 19Mn5 | 1.0482 | - | 510-610 |
| 15Mo3 | 1.5415 | 275 | 450-600 |
| 13CrMo910 | 1.7335 | 295 | 440-590 |
| 10CrMo910 | 1.7380 | 285 | 450-600 |
| 14MoV63 | 1.7715 | 325 | 460-610 |
| X20CrMoV121 | 1.4922 | 490 | 690-850 |
Each grade has been meticulously engineered to meet specific performance criteria, ensuring safety and longevity in harsh environments. Whether you're working with low-alloy steels like St35.8 or high-alloy variants such as X20CrMoV121, these pipes deliver exceptional strength and resilience.
In conclusion, DIN 17175 alloy steel pipes represent a robust solution for industries requiring materials capable of enduring high temperatures and pressures. Their versatility and reliability make them a preferred choice across multiple sectors, from energy production to chemical processing.
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