Stainless Steel 904L Gate Valve
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904L Gate Valve (API 602), EN 1.4539 Gate Valve (API 602)

 

1. Main features of 904L gate valves:

 

904L is an ultra-low carbon, high-alloy austenitic stainless steel. The core advantage of 904L gate 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 gate valves Produced by Freeman Valve:

 

2.1 Excellent corrosion resistance:

 

① Freeman Valve's 904L gate 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 gate 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 gate 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 gate 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 gate valves:

 

3.1 Not suitable for strong oxidizing environments:

In strong oxidizing acids such as nitric acid, 904L gate 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 gate 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 gate valves:

 

4.1 Freeman Valve 904L gate 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 gate 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 gate 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 gate 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 gate 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 gate 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 gate valves and 2205 gate valves in resisting chloride ion corrosion

 

1. Different emphases on pitting/crevice corrosion resistance:

 

① The pitting equivalent value (PREN≈33-35) of the 2205 gate valves is higher than that of the 904L gate 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 gate valves results in a passivation film with significantly greater stability than that of the 2205 gate 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 gate valves, but the high nickel content of 904L gate valves significantly reduces this susceptibility. 2205 gate valves also exhibit better SCC resistance than ordinary austenitic steels such as 316L gate valves, but under the same chloride ion concentration and stress conditions, their long-term stability is slightly lower than that of 904L gate valves.

 

3. Differences in process and operating condition compatibility:

 

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

 

② 2205 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 gate valves) makes them more suitable for high-pressure + high-chlorine composite operating conditions (such as high-pressure seawater pipelines).




Design Standard of 904L Gate Valve:

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

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

 

Test Standard of 904L Gate Valve:

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

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

 

Surface Finishing of 904L Gate Valve:

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

 

Size of 904L Gate Valve:

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

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

 

Face to Face of 904L Gate Valve:

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

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

 

Pressure Rating of 904L Gate Valve:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

 

Working Temperature of 904L Gate Valve:

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

 

Ends Connection of 904L Gate Valve:

ANSI Flange Ends 904L Gate Valve;

ANSI Integral Flange Ends 904L Gate Valve;

ANSI Welded Flange Ends 904L Gate Valve;

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

Butt Weld x ANSI Flange Ends 904L Gate Valve;

EN 1092 Flange Ends 904L Gate Valve;

EN 1092 Integral Flange Ends 904L Gate Valve;

EN 1092 Welded Flange Ends 904L Gate Valve;

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

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

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

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

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

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

Male NPT x Female NPT Ends 904L Gate Valve;

Male BSPP x Female BSPP Ends 904L Gate Valve;

Male BSPT x Female BSPT Ends 904L Gate Valve;

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

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

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

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

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

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

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

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

Female NPT x Socket Weld Ends 904L Gate Valve;

Female BSPP x Socket Weld Ends 904L Gate Valve;

Female BSPT x Socket Weld Ends 904L Gate Valve;

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

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

Female NPT x Butt Weld Ends 904L Gate Valve;

Female BSPP x Butt Weld Ends 904L Gate Valve;

Female BSPT x Butt Weld Ends 904L Gate Valve;

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

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

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

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

 

CE Marking of 904L Gate Valve:

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

 

Chemical Composition of 904L Gate Valve:

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

 

Mechanical Properties of 904L Gate Valve:

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

 

Certificate of 904L Gate Valve:

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

 

Approvals of 904L Gate Valve:

MSS SP-110 Certified of 904L Gate Valve;

NACE MR 0175 Certified of 904L Gate Valve

API 607 Fire Safe Certified of 904L Gate Valve;

ISO 9001 Certified of 904L Gate Valve;

PED Certified of 904L Gate Valve.

 

Available Upon Request of 904L Gate Valve:

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

ATEX is available upon request of 904L Gate Valve;

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

SIL is available upon request of 904L Gate Valve;

Degreasing is available upon request of 904L Gate Valve;

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

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

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

 


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