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What Are the Advantages and Characteristics of DIN17165 19 Mn 8 Steel
High Strength and Toughness
Yield Strength: ≥185–310 MPa (specific value depends on heat treatment condition), meeting the load-bearing requirements of high-temperature and high-pressure equipment.
Tensile Strength: 350–630 MPa, ensuring structural safety under extreme loads.
Elongation: 17–25%, demonstrating excellent plastic deformation capacity and reducing the risk of brittle fracture.
Low-Temperature Toughness: Impact energy reaches 27–31 J at 0–20°C, adapting to harsh conditions in low-temperature environments (e.g., Arctic waters).
Excellent High-Temperature Performance
Heat Resistance: Yield strength retention rate >85% at 300°C, with creep rupture strength ≥180 MPa (for 10⁵ hours of fracture), suitable for high-temperature components such as steam boilers and superheaters.
Thermal Stability: Microstructure improved through normalizing treatment (holding at 910–960°C for 1.5 min/mm), reducing creep deformation at elevated temperatures.
Good Weldability and Machinability
Weldability: Carbon equivalent design (C ≤0.22%, Mn 1.00–1.60%) reduces the tendency for welding-induced hardening, supporting efficient on-site welding.
Hot Formability: Hot forming temperature range of 850–920°C, with final cooling temperature ≥600°C, facilitating processing of complex structures.
Lamellar Tear Resistance: Reduced risk of through-thickness cracking by controlling sulfur (S ≤0.030%) and phosphorus (P ≤0.035%) content.
Corrosion Resistance and Long Service Life
Corrosion Resistance: Stable performance in common corrosive media (e.g., steam, freshwater), suitable for chemical vessels and pipelines.
Fatigue Resistance: Extended equipment lifespan through optimized Mn/C ratio (6.5–8.0) and control of residual elements (Cu + Cr + Ni + Mo ≤0.70%).