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DIN W.Nr.2.4819 Nut
QS Fastener: DIN W.Nr.2.4819 Nut
Name: DIN W.Nr.2.4819 Nut
Material: N10276
Size: M6 to M100
Product Grade: A
Standard: ANSI, DIN, BSW
Tensile Strength(Rm): 690 N/mm²
Elongation: 40%
Feature: Excellent corrosion resistance.
Application: For chemical industry, petroleum industry and Acid Corrosion Environment, etc.
Material: N10276
Size: M6 to M100
Product Grade: A
Standard: ANSI, DIN, BSW
Tensile Strength(Rm): 690 N/mm²
Elongation: 40%
Feature: Excellent corrosion resistance.
Application: For chemical industry, petroleum industry and Acid Corrosion Environment, etc.
Quantity
The DIN W.Nr.2.4819 Nut is made from high-performance N10276 (Hastelloy C-276) material, available in sizes ranging from M6 to M100, and complies with ANSI, DIN, and BSW standards. It boasts a tensile strength of 690 N/mm² and an elongation rate of 40%, along with exceptional corrosion resistance, making it particularly suitable for extreme working conditions in chemical, petroleum, and acidic corrosive environments. It ensures the long-term safe operation of equipment under high-temperature, high-pressure, or cryogenic conditions, making it an ideal choice for industrial applications!
The outstanding performance of the DIN W.Nr.2.4819 Nut (N10276, Hastelloy C-276) in resisting stress corrosion cracking (SCC) stems from its unique alloy design and microstructure optimization. Below is a detailed analysis from the perspectives of material composition, environmental adaptability, experimental data, and application scenarios:
1. Material Composition and SCC Resistance Mechanism
N10276 is a nickel-molybdenum-chromium-based alloy with the following typical composition:
- Nickel (Ni): ≥52%, providing excellent corrosion resistance and toughness.
- Molybdenum (Mo): 15-17%, enhancing resistance to chlorides and reducing media.
- Chromium (Cr): 14.5-16.5%, improving oxidation resistance and sulfide corrosion resistance.
- Tungsten (W): 3-4.5%, further strengthening resistance to pitting and crevice corrosion.
- Iron (Fe): 4-7%, optimizing processing performance.
- Carbon (C): ≤0.01%, reducing the risk of intergranular corrosion.
N10276 is a nickel-molybdenum-chromium-based alloy with the following typical composition:
- Nickel (Ni): ≥52%, providing excellent corrosion resistance and toughness.
- Molybdenum (Mo): 15-17%, enhancing resistance to chlorides and reducing media.
- Chromium (Cr): 14.5-16.5%, improving oxidation resistance and sulfide corrosion resistance.
- Tungsten (W): 3-4.5%, further strengthening resistance to pitting and crevice corrosion.
- Iron (Fe): 4-7%, optimizing processing performance.
- Carbon (C): ≤0.01%, reducing the risk of intergranular corrosion.
This composition design enables the DIN W.Nr.2.4819 Nut to form a stable passive film in chloride and sulfide environments, effectively preventing crack initiation and propagation. Additionally, its low carbon content and high molybdenum and chromium content significantly reduce susceptibility to intergranular corrosion and SCC.
2. SCC Resistance in Chloride Environments
In chloride environments, SCC is typically initiated by chloride ions (Cl⁻), especially under high temperature and high stress conditions. The DIN W.Nr.2.4819 Nut performs exceptionally under the following conditions:
- Chloride Concentration: It maintains excellent SCC resistance even in chloride solutions with concentrations up to 100,000 ppm (10%).
In chloride environments, SCC is typically initiated by chloride ions (Cl⁻), especially under high temperature and high stress conditions. The DIN W.Nr.2.4819 Nut performs exceptionally under the following conditions:
- Chloride Concentration: It maintains excellent SCC resistance even in chloride solutions with concentrations up to 100,000 ppm (10%).
- Temperature Range: In high-temperature environments ranging from 150°C to 200°C, its SCC critical stress intensity factor (KISCC) remains as high as 60 MPa√m, far exceeding that of ordinary stainless steel (e.g., 20-30 MPa√m for 316L).
- Stress Level: No significant crack propagation is observed under high stress conditions at 80% of the yield strength.
Experimental Data:
- ASTM G36 Standard Test: In boiling 42% magnesium chloride (MgCl₂) solution, the SCC failure time of the DIN W.Nr.2.4819 Nut exceeds 1000 hours, whereas ordinary stainless steel (e.g., 304 or 316) typically fails within 24-48 hours.
- ASTM G36 Standard Test: In boiling 42% magnesium chloride (MgCl₂) solution, the SCC failure time of the DIN W.Nr.2.4819 Nut exceeds 1000 hours, whereas ordinary stainless steel (e.g., 304 or 316) typically fails within 24-48 hours.
- Critical Temperature: In chloride environments, the SCC critical temperature of the DIN W.Nr.2.4819 Nut is as high as 200°C, compared to less than 100°C for ordinary stainless steel.
3. SCC Resistance in Sulfide Environments
In sulfide environments, hydrogen sulfide (H₂S) is the primary factor initiating SCC, especially under acidic conditions. The DIN W.Nr.2.4819 Nut performs exceptionally under the following conditions:
- H₂S Concentration: It maintains stable SCC resistance even in environments with H₂S concentrations up to 1000 ppm.
In sulfide environments, hydrogen sulfide (H₂S) is the primary factor initiating SCC, especially under acidic conditions. The DIN W.Nr.2.4819 Nut performs exceptionally under the following conditions:
- H₂S Concentration: It maintains stable SCC resistance even in environments with H₂S concentrations up to 1000 ppm.
- pH Range: No significant crack propagation is observed under strongly acidic conditions with pH as low as 2.5.
- Temperature Range: In the temperature range of 100°C to 150°C, its SCC critical stress intensity factor (KISCC) remains above 50 MPa√m.
Experimental Data:
- NACE TM0177 Standard Test: In a solution of 5% NaCl + 0.5% acetic acid + saturated H₂S, the SCC failure time of the DIN W.Nr.2.4819 Nut exceeds 720 hours, whereas ordinary stainless steel (e.g., 316L) typically fails within 24 hours.
- NACE TM0177 Standard Test: In a solution of 5% NaCl + 0.5% acetic acid + saturated H₂S, the SCC failure time of the DIN W.Nr.2.4819 Nut exceeds 720 hours, whereas ordinary stainless steel (e.g., 316L) typically fails within 24 hours.
- Critical pH Value: In sulfide environments, the SCC critical pH value of the DIN W.Nr.2.4819 Nut is as low as 2.0, compared to above 4.0 for ordinary stainless steel.
4. Application Scenarios
Thanks to its exceptional SCC resistance, the DIN W.Nr.2.4819 Nut is widely used in the following fields:
- Chemical Industry: Used in reactors, heat exchangers, and piping systems, the DIN W.Nr.2.4819 Nut can operate stably for long periods in strong acids, alkalis, and chloride environments.
Thanks to its exceptional SCC resistance, the DIN W.Nr.2.4819 Nut is widely used in the following fields:
- Chemical Industry: Used in reactors, heat exchangers, and piping systems, the DIN W.Nr.2.4819 Nut can operate stably for long periods in strong acids, alkalis, and chloride environments.
- Oil and Gas: Suitable for oil and gas extraction equipment and pipelines, the DIN W.Nr.2.4819 Nut maintains excellent corrosion resistance under high H₂S concentrations and acidic conditions.
- Environmental Protection: Used in flue gas desulfurization systems and wastewater treatment equipment, the DIN W.Nr.2.4819 Nut can operate for long periods in high-temperature corrosive environments.
- Nuclear Industry: Used in internal components of nuclear reactors, the DIN W.Nr.2.4819 Nut maintains excellent mechanical properties and corrosion resistance under high-temperature radiation environments.
Through its optimized alloy composition and microstructure, the DIN W.Nr.2.4819 Nut demonstrates exceptional resistance to stress corrosion cracking in chloride and sulfide environments. Its high KISCC value, wide temperature range, and low pH adaptability make it an ideal material choice for extreme environments. Experimental data and application cases both prove that the DIN W.Nr.2.4819 Nut effectively prevents SCC during long-term operation, ensuring the safety and reliability of equipment.
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