DIN 17175 Seamless Steel Pipe
Basic Overview
A German standard for seamless steel tubes and pipes designed for use at elevated temperatures, primarily in power plants, boilers, and heat exchangers. It focuses on long-term strength and creep resistance under high heat.
Name Explanation
| Part | Meaning |
|---|---|
| DIN | German Institute for Standardization |
| 17175 | Standard for seamless tubes of heat-resistant steels |
| Seamless | No longitudinal weld seam |
| Key Focus | High-temperature service |
Key Features & Grades
| Feature | Description |
|---|---|
| Primary Use | High-temperature/pressure service (e.g., steam lines) |
| Operating Range | Typically for service temperatures above 400°C (752°F) |
| Material | Heat-resistant low-alloy steels (with Cr, Mo, V additions) |
| Key Properties | Creep strength, oxidation resistance, structural stability |
| Common Grades | St.35.8, St.45.8, 15Mo3, 13CrMo4-5, 10CrMo9-10 |
Comparison Table: DIN 17175 vs. DIN 1629
| Aspect | DIN 17175 | DIN 1629 |
|---|---|---|
| Main Purpose | High-temperature service (power plants) | General engineering/pressure |
| Critical Property | Creep rupture strength | Tensile/yield strength at room temperature |
| Material | Low-alloy, heat-resistant steels | Unalloyed quality steels |
| Typical Use | Superheater tubes, steam headers | Hydraulic systems, boilers (lower temp) |
| Testing Focus | High-temperature tensile, creep tests | Room-temperature tests |
Common Applications
Power plant boilers (superheaters, reheater tubes, headers)
High-pressure steam pipelines
Heat exchangers in chemical/petrochemical plants
High-temperature piping in industrial furnaces
Components for nuclear power installations (specific grades)
Key Grade Example: 15Mo3
Typical Use: Boiler superheater tubes
Key Alloy: ~0.3% Molybdenum
Feature: Good creep strength up to ~500°C
Note: DIN 17175 has been largely superseded by the European standard EN 10216-2 (Seamless tubes for pressure purposes - Part 2), but the DIN designation and grade names (like 13CrMo4-5) remain very common in technical specifications and industry use.
