1.What are the advantages of 904L ball valve produced by Freeman Valve?

1.1. 904L ball valve is an austenitic stainless steel. It is softer than 316L;

1.2. 904L ball valve has molybdenum added to give it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids;

1.3. 904L ball valve has copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid;

1.4. 904L ball valve has high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible;

1.5. 904L ball valve has low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.

2.What are the advantages of 1.4539 ball valve produced by Freeman Valve?

2.1. 1.4539 ball valve is an austenitic stainless steel. It is softer than 316L;

2.2. 1.4539 ball valve has molybdenum added to give it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids;

2.3. 1.4539 ball valve has copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid;

2.4. 1.4539 ball valve has high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible;

2.5. 1.4539 ball valve has low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.

3.What are the advantages of UNS N08904 ball valve produced by Freeman Valve?

3.1. UNS N08904 ball valve is an austenitic stainless steel. It is softer than 316L;

3.2. UNS N08904 ball valve has molybdenum added to give it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids;

3.3. UNS N08904 ball valve has copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid;

3.4. UNS N08904 ball valve has high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible;

3.5. UNS N08904 ball valve has low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.

4.What are the advantages of SS2562 ball valve produced by Freeman Valve?

4.1. SS2562 ball valve is an austenitic stainless steel. It is softer than 316L;

4.2. SS2562 ball valve has molybdenum added to give it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids;

4.3. SS2562 ball valve has copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid;

4.4. SS2562 ball valve has high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible;

4.5. SS2562 ball valve has low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.

1. Freeman Valve's 904L stainless steel valves offer the following advantages:

1.1 Excellent Corrosion Resistance:

a. Freeman Valve's 904L stainless steel valves have high molybdenum (Mo: 4-5%) and copper (Cu: 1-2%) content, significantly improving their corrosion resistance against reducing acids (such as sulfuric acid and phosphoric acid) and halides (such as chloride ions).

b. Freeman Valve's 904L stainless steel valves perform exceptionally well in media such as dilute sulfuric acid, boiling phosphoric acid, and organic acids, with outstanding resistance to pitting and crevice corrosion.

1.2 Excellent Stress Corrosion Cracking (SCC) Resistance:

Freeman Valve's 904L stainless steel valves are suitable for use in environments containing chloride ions (such as seawater and chloride solutions), and their resistance to stress corrosion cracking is superior to that of conventional austenitic stainless steel.

1.3 High-Temperature Adaptability:

Freeman Valve's 904L stainless steel valves maintain stability at high temperatures and can withstand temperatures of approximately 400°C for short periods.

2. When using 904L stainless steel valves, please note the following:

2.1 Not suitable for highly oxidizing environments：

In strong oxidizing acids such as nitric acid, the corrosion resistance of 904L stainless steel valves is actually inferior to that of 304L or 316L stainless steel valves with lower molybdenum content.

2.2 Sensitivity Issues:

Improper welding or heat treatment can easily lead to carbide precipitation, requiring solution treatment (rapid cooling at 1100-1150°C) to restore performance.

3. Typical Applications of Freeman Valve's 904L stainless steel valves:

3.1 Freeman Valve's 904L stainless steel valves are widely used in equipment used in sulfuric acid environments. For example, they are used in dilute sulfuric acid storage tanks, pipelines, and heat exchangers (especially for sulfuric acid with a concentration of ≤10% and a temperature of ≤40°C, where they exhibit excellent corrosion resistance).

3.2 Freeman Valve's 904L stainless steel valves are widely used in systems containing chloride ions. For example, they are used in seawater cooling systems, salt chemical evaporators, and chlorination reactor linings.

3.3 Freeman Valve's 904L stainless steel valves are widely used in organic acid processing, for example, in acetic acid and formic acid production equipment to prevent localized corrosion.

3.4 Freeman Valve's 904L stainless steel valves are widely used in environmental protection and hydrometallurgy, for example, in flue gas desulfurization (FGD) system components and acidic wastewater treatment equipment.

3.5 Freeman Valve's 904L stainless steel valves are widely used in PTA (purified terephthalic acid) production, for example, in crystallizers and condensers used in high-temperature acetic acid media.

3.6 Freeman Valve's 904L stainless steel valves are widely used in the pharmaceutical industry, for example, in reactors and piping for high-purity pharmaceuticals (resistant to cleaning agent corrosion).