Stainless Steel 904L Plug Valve
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904L Plug Valves, EN 1.4539 Plug Valve

 

1. Main features of 904L plug valves:

 

904L is an ultra-low carbon, high-alloy austenitic stainless steel. The core advantage of 904L plug valves is their exceptional corrosion resistance in harsh environments such as dilute sulfuric acid and chloride-containing media, and their ease of machining and welding.

 

2. Main advantages of 904L plug valves Produced by Freeman Valve:

 

2.1 Excellent corrosion resistance:

 

① Freeman Valve's 904L plug valves have high molybdenum (Mo: 4~5%) and copper (Cu: 1~2%) content, significantly improving their resistance to reducing acids (such as sulfuric acid and phosphoric acid) and halides (such as chloride ions);

 

② Freeman Valve's 904L plug valves perform excellently in media such as dilute sulfuric acid, boiling phosphoric acid, and organic acids, exhibiting outstanding resistance to pitting and crevice corrosion.

 

2.2 Excellent resistance to stress corrosion cracking (SCC):

Freeman Valve's 904L plug valves are suitable for environments containing chloride ions (such as seawater and chloride solutions), exhibiting superior resistance to stress corrosion cracking compared to conventional austenitic stainless steels.

 

2.3 High-temperature adaptability:

Freeman Valve's 904L plug valves maintain stability at high temperatures and can withstand short-term environments up to approximately 400°C.

 

3. The following points should be noted when using 904L plug valves:

 

3.1 Not suitable for strong oxidizing environments:

In strong oxidizing acids such as nitric acid, 904L plug valves actually have lower corrosion resistance than 304L or 316L valves with lower molybdenum content.

 

3.2 Sensitivity issues:

Improper welding or heat treatment of 904L plug valves can easily lead to carbide precipitation, requiring solution treatment (rapid cooling at 1100~1150°C) to restore performance.

 

4. Classic applications of Freeman Valve 904L plug valves:

 

4.1 Freeman Valve 904L plug valves are widely used in sulfuric acid environments.

For example: dilute sulfuric acid storage tanks, pipelines, heat exchangers (especially for sulfuric acid with a concentration ≤10%, exhibiting excellent corrosion resistance at temperatures ≤40℃).

 

4.2 Freeman Valve 904L plug valves are widely used in systems containing chloride ions.

For example: seawater cooling systems, salt chemical evaporators, chlorination reactor linings.

 

4.3 Freeman Valve 904L plug valves are widely used in organic acid processing.

For example: acetic acid and formic acid production equipment, preventing localized corrosion.

 

4.4 Freeman Valve 904L plug valves are widely used in environmental protection and hydrometallurgical fields.

For example: flue gas desulfurization (FGD) system components, acidic wastewater treatment equipment.

 

4.5 Freeman Valve 904L plug valves are widely used in PTA (purified terephthalic acid) production.

For example: crystallizers and condensers used in high-temperature acetic acid media.

 

4.6 Freeman Valve's 904L plug valves are widely used in the pharmaceutical industry.

For example: reaction vessels and pipelines for high-purity pharmaceuticals (resistant to cleaning agent corrosion).

 

Differences between 904L plug valve and 2205 plug valve in resisting chloride ion corrosion

 

1. Different emphases on pitting/crevice corrosion resistance:

 

① The pitting equivalent value (PREN≈33-35) of the 2205 plug valves is higher than that of the 904L plug valves (PREN≈32-34), and the nitrogen content further enhances its resistance to pitting corrosion in high-concentration, high-temperature chloride ion environments (such as high-chlorinated brine in deep well oil production and seawater above 60℃).

 

② The high nickel + copper content of the 904L plug valves results in a passivation film with significantly greater stability than that of the 2205 plug valves in reducing media containing chloride (such as dilute sulfuric acid + chloride ion mixtures), without exhibiting the phase imbalance problem common in duplex steels.

 

2. Differences in resistance to stress corrosion cracking (SCC):

 

① Stress corrosion cracking under chloride ion conditions is a common failure mode for 2205 plug valves, but the high nickel content of 904L plug valves significantly reduces this susceptibility. 2205 plug valves also exhibit better SCC resistance than ordinary austenitic steels such as 316L plug valves, but under the same chloride ion concentration and stress conditions, their long-term stability is slightly lower than that of 904L plug valves.

 

3. Differences in process and operating condition compatibility:

 

① 904L plug valves require no heat treatment after welding and have good low-temperature toughness, making them suitable for polar and marine environments.

 

② 2205 plug valves require controlled heat input during welding to avoid excessive ferrite content, but their high strength (tensile strength ≥620MPa, more than 1.2 times that of 904L plug valves) makes them more suitable for high-pressure + high-chlorine composite operating conditions (such as high-pressure seawater pipelines).


Design Standard of 904L Plug Valve:

Design Acc. to ASME B16.34 (ANSI Standard 904L Plug Valve);

Design Acc. to EN-12516-1/2 (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve).

 

Test Standard of 904L Plug Valve:

Test Acc. to API 598 (ANSI Standard 904L Plug Valve);

Test Acc. to EN 12266-1/2 (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve).

 

Surface Finishing of 904L Plug Valve:

All 904L Plug Valve surface is finely machined to achieve the required roughness and conforms to standard MSS SP-110.

 

Size of 904L Plug Valve:

From DN1/4’’ to 48’’ (ANSI Standard 904L Plug Valve);

From DN8 to DN1200 (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve).

 

Face to Face of 904L Plug Valve:

Face to Face Acc. to ASME B16.10 (ANSI Standard 904L Plug Valve);

Face to Face Acc. to EN 558-1 (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve).

 

Pressure Rating of 904L Plug Valve:

ANSI Class 150 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 300 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 600 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 800 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 900 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 1500 904L Plug Valve (ANSI Standard 904L Plug Valve);

ANSI Class 2500 904L Plug Valve (ANSI Standard 904L Plug Valve);

EN 1092 PN 16 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 25 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 40 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 63 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 100 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 160 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 250 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 320 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve);

EN 1092 PN 400 904L Plug Valve (EN Standard 904L Plug Valve, DIN Standard 904L Plug Valve).

 

Working Temperature of 904L Plug Valve:

Please refer to the "Temperature and Pressure Curve of 904L Plug Valve" for temperature and pressure changes.

 

Ends Connection of 904L Plug Valve:

ANSI Flange Ends 904L Plug Valve;

ANSI Integral Flange Ends 904L Plug Valve;

ANSI Welded Flange Ends 904L Plug Valve;

Butt Weld (ASME B16.25) Ends 904L Plug Valve;

Butt Weld x ANSI Flange Ends 904L Plug Valve;

EN 1092 Flange Ends 904L Plug Valve;

EN 1092 Integral Flange Ends 904L Plug Valve;

EN 1092 Welded Flange Ends 904L Plug Valve;

Butt Weld (EN 12627) Ends 904L Plug Valve;

Butt Weld (ISO 1127) Ends 904L Plug Valve;

Butt Weld x EN 1092 Flange Ends 904L Plug Valve;

Male NPT (ASME B1.20.1) Ends 904L Plug Valve;

Male BSPP (ISO 228-1) Ends 904L Plug Valve;

Male BSPT (ISO 7-1) Ends 904L Plug Valve;

Male NPT x Female NPT Ends 904L Plug Valve;

Male BSPP x Female BSPP Ends 904L Plug Valve;

Male BSPT x Female BSPT Ends 904L Plug Valve;

Male NPT x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Male BSPP x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Male BSPT x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Female NPT (ASME B1.20.1) Ends 904L Plug Valve;

Female BSPP (ISO 228-1) Ends 904L Plug Valve;

Female BSPT (ISO 7-1) Ends 904L Plug Valve;

Socket Weld (ASME B16.11) Ends 904L Plug Valve;

Socket Weld (EN 12760) Ends 904L Plug Valve;

Female NPT x Socket Weld Ends 904L Plug Valve;

Female BSPP x Socket Weld Ends 904L Plug Valve;

Female BSPT x Socket Weld Ends 904L Plug Valve;

Butt Weld (ASME B16.25) Ends 904L Plug Valve;

Butt Weld (EN 12627) Ends 904L Plug Valve;

Female NPT x Butt Weld Ends 904L Plug Valve;

Female BSPP x Butt Weld Ends 904L Plug Valve;

Female BSPT x Butt Weld Ends 904L Plug Valve;

Female NPT x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Female BSPP x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Female BSPT x Long Butt Weld (+100 mm) Ends 904L Plug Valve;

Long Butt Weld (+100 mm Weld Stub) Ends 904L Plug Valve.

 

CE Marking of 904L Plug Valve:

CE Marking is Available to 904L Plug Valve with a Diameter of DN32 or Larger.

 

Chemical Composition of 904L Plug Valve:

For the Chemical Composition of 904L Plug Valve, please refer to EN 10204 Type 3.1 certificate.

 

Mechanical Properties of 904L Plug Valve:

For the Mechanical Properties of 904L Plug Valve, please refer to EN 10204 Type 3.1 certificate.

 

Certificate of 904L Plug Valve:

All 904L Plug Valve will be delivered with EN 10204 Type 3.1 Certificate.

 

Approvals of 904L Plug Valve:

MSS SP-110 Certified of 904L Plug Valve;

NACE MR 0175 Certified of 904L Plug Valve

API 607 Fire Safe Certified of 904L Plug Valve;

ISO 9001 Certified of 904L Plug Valve;

PED Certified of 904L Plug Valve.

 

Available Upon Request of 904L Plug Valve:

NACE MR0175 is available upon request of 904L Plug Valve;

ATEX is available upon request of 904L Plug Valve;

TA-LUFT is available upon request of 904L Plug Valve;

SIL is available upon request of 904L Plug Valve;

Degreasing is available upon request of 904L Plug Valve;

Fire Safe is available upon request of 904L Plug Valve;

Stem Extension is available upon request of 904L Plug Valve;

Double Block and Bleed is available upon request of 904L Plug Valve.

 


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