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SS 904L Thread Rod
QS Fastener: SS 904L Thread Rod
Name: SS 904L Thread Rod
Standard: DIN, ANSI/ASTM
Material: W.Nr.1.4539
Size: M6 to M100
Length: 30 to 800 mm
Product Grade: A
Tensile Strength(Rm): 490 N/mm²
Elongation: 35%
Feature: High Resistance to Pitting and Stress Corrosion Cracking
Application: For Petroleum and Petrochemical Equipment, etc.
Standard: DIN, ANSI/ASTM
Material: W.Nr.1.4539
Size: M6 to M100
Length: 30 to 800 mm
Product Grade: A
Tensile Strength(Rm): 490 N/mm²
Elongation: 35%
Feature: High Resistance to Pitting and Stress Corrosion Cracking
Application: For Petroleum and Petrochemical Equipment, etc.
Quantity
The SS 904L Thread Rod is manufactured from high-quality W.Nr.1.4539 material, compliant with DIN and ANSI/ASTM international standards. It is available in sizes ranging from M6 to M100, with lengths customizable to meet specific requirements (30 - 800 mm). The product boasts exceptional mechanical properties, including a tensile strength of ≥ 490 N/mm² and an elongation rate of ≥ 35%, ensuring superior strength and toughness even under high-load conditions. The core advantage of the SS 904L Thread Rod lies in its outstanding corrosion resistance, making it suitable for demanding environments such as oil and chemical industries.
The SS 904L Thread Rod is a high-alloy austenitic stainless steel, and its excellent corrosion resistance is primarily attributed to its unique composition design, featuring high nickel (Ni: 23-28%) and high molybdenum (Mo: 4-5%) content. This combination enables it to perform exceptionally well in various harsh corrosive environments, particularly in resisting pitting, crevice corrosion, and stress corrosion cracking (SCC).
1. Resistance to Pitting and Crevice Corrosion
The high molybdenum content in the SS 904L Thread Rod significantly enhances its resistance to pitting in chloride-containing environments. According to ASTM G48 standard testing, its critical pitting temperature (CPT) can exceed 50°C, far surpassing that of ordinary stainless steels (e.g., 316L). Additionally, its high nickel content effectively inhibits crevice corrosion, making it perform exceptionally well in areas prone to crevice corrosion, such as sealing surfaces and threaded connections.
The high molybdenum content in the SS 904L Thread Rod significantly enhances its resistance to pitting in chloride-containing environments. According to ASTM G48 standard testing, its critical pitting temperature (CPT) can exceed 50°C, far surpassing that of ordinary stainless steels (e.g., 316L). Additionally, its high nickel content effectively inhibits crevice corrosion, making it perform exceptionally well in areas prone to crevice corrosion, such as sealing surfaces and threaded connections.
2. Resistance to Stress Corrosion Cracking (SCC)
The high nickel content in the SS 904L Thread Rod significantly reduces its susceptibility to stress corrosion cracking in chloride environments. Experimental data show that in a boiling 42% magnesium chloride solution, the SS 904L Thread Rod can withstand testing for over 1000 hours without cracking, whereas ordinary 304 or 316 stainless steels typically fail within hours under the same conditions.
The high nickel content in the SS 904L Thread Rod significantly reduces its susceptibility to stress corrosion cracking in chloride environments. Experimental data show that in a boiling 42% magnesium chloride solution, the SS 904L Thread Rod can withstand testing for over 1000 hours without cracking, whereas ordinary 304 or 316 stainless steels typically fail within hours under the same conditions.
3. Performance in Highly Corrosive Media
- Sulfuric Acid Environment: In sulfuric acid with a concentration of ≤ 10%, the SS 904L Thread Rod exhibits excellent corrosion resistance at room temperature, with a corrosion rate of less than 0.1 mm/year.
- Phosphoric Acid Environment: In phosphoric acid with a concentration of ≤ 85%, the SS 904L Thread Rod shows an extremely low corrosion rate at temperatures below 60°C, making it suitable for phosphoric acid production equipment.
- Chloride Environment: In media containing chloride ions, such as seawater and brine, the SS 904L Thread Rod far outperforms ordinary stainless steels in corrosion resistance, making it an ideal choice for marine engineering and chemical equipment.
- Sulfuric Acid Environment: In sulfuric acid with a concentration of ≤ 10%, the SS 904L Thread Rod exhibits excellent corrosion resistance at room temperature, with a corrosion rate of less than 0.1 mm/year.
- Phosphoric Acid Environment: In phosphoric acid with a concentration of ≤ 85%, the SS 904L Thread Rod shows an extremely low corrosion rate at temperatures below 60°C, making it suitable for phosphoric acid production equipment.
- Chloride Environment: In media containing chloride ions, such as seawater and brine, the SS 904L Thread Rod far outperforms ordinary stainless steels in corrosion resistance, making it an ideal choice for marine engineering and chemical equipment.
Application Scenarios
Thanks to its exceptional corrosion resistance, the SS 904L Thread Rod is widely used in demanding conditions in industries such as petrochemicals, marine engineering, and pharmaceutical equipment. It is particularly effective in highly corrosive media such as sulfuric acid, phosphoric acid, and chlorides, providing customers with long-term and reliable connection solutions.
Thanks to its exceptional corrosion resistance, the SS 904L Thread Rod is widely used in demanding conditions in industries such as petrochemicals, marine engineering, and pharmaceutical equipment. It is particularly effective in highly corrosive media such as sulfuric acid, phosphoric acid, and chlorides, providing customers with long-term and reliable connection solutions.
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