Performance, Precautions, and Differences from A182 F51 of Freeman Valve's ASTM A995 Gr. 4A ANSI Y-type strainer
ASTM A995 Gr. 4A (formerly CD3MN), as a cast version of 2205 duplex stainless steel, is an ideal ANSI Y-type strainer material for chloride-containing environments due to its excellent resistance to chloride ion corrosion. The following focuses on the core advantages, usage precautions, differences from the forged version (ASTM A182 F51), and its shortcomings of this ANSI Y-type strainer model manufactured by Freeman Valve.
1. Core Advantages of Freeman Valve's ASTM A995 Gr. 4A ANSI Y-type strainer in Resisting Chloride Ion Corrosion
1.1 Excellent Resistance to Chloride Ion Stress Corrosion Cracking (SCC)
This is the most crucial advantage of this ANSI Y-type strainer model and the key reason why it replaces the traditional CF3M ANSI Y-type strainer. From a mechanistic perspective, ASTM A995 Gr. 4A employs a ferrite (F) + austenite (A) dual-phase microstructure, completely breaking the SCC sensitivity mechanism of pure austenitic stainless steel under the coupled effects of chloride ions and tensile stress. The ferrite phase effectively inhibits crack propagation, significantly improving the ANSI Y-type strainer's SCC threshold.
In practical applications, this ANSI Y-type strainer exhibits far superior corrosion resistance to 304 and 316L austenitic stainless-steel castings in typical SCC environments such as seawater, brine, and chlorinated process media. It can operate stably for extended periods under conditions where traditional austenitic stainless-steel ANSI Y-type strainer frequently fail, greatly improving equipment reliability.
1.2 Excellent Resistance to Pitting and Crevice Corrosion
This advantage stems from its well-designed alloy composition: ASTM A995 Gr. 4A contains approximately 22% chromium (Cr), 3% molybdenum (Mo), and 0.10–0.30% nitrogen (N), achieving a pitting resistance equivalent (PREN) of 32–38, comparable to forged 2205 (UNS S32205) duplex steel and significantly higher than 316L castings (PREN≈25).
The synergistic effect of Mo and N is particularly crucial, giving it extremely strong resistance to pitting and crevice corrosion in neutral to weakly acidic media containing chloride ions (such as seawater and chloride solutions). It is especially suitable for complex casting structures with gaps, easily deposited media, and localized stagnation, such as ANSI Y-type strainer internal flow channels and flange sealing surfaces, reducing the risk of localized corrosion failure at its source.
1.3 Excellent Resistance to Uniform Corrosion
In neutral, weakly alkaline, and weakly acidic environments containing chloride ions, the high Cr content in ASTM A995 Gr. 4A ANSI Y-type strainer forms a stable passivation film with an extremely low overall uniform corrosion rate, far superior to ordinary carbon steel and low-alloy cast iron ANSI Y-type strainer. This effectively resists the overall erosion of the ANSI Y-type strainer body by chloride ions, extending the ANSI Y-type strainer's service life.
2. Precautions for Using ASTM A995 Gr. 4A ANSI Y-type strainer
2.1 Temperature Limitations
The recommended long-term operating temperature for this ANSI Y-type strainer is ≤300℃. Exceeding this temperature will significantly reduce the stability of its duplex structure, accelerate the precipitation of intermetallic phases, and significantly deteriorate its resistance to chloride ion corrosion. Especially under the combined conditions of "high temperature + high chloride," its corrosion resistance is far inferior to that of super duplex steel castings (such as ASTM A995 5A/6A) or nickel-based alloy castings, requiring material upgrades based on the specific operating conditions.
2.2 Concentration/Pressure Limitations
Use in extreme corrosive conditions should be avoided: Environments with extremely high concentrations of chloride ions, high temperature and pressure, or strong acidic chlorides (such as high-temperature concentrated hydrochloric acid, high-chlorine and high-pressure oil and gas) require careful consideration. ASTM A995 Gr. 4A ANSI Y-type strainer have insufficient resistance to pitting corrosion and SCC, making them prone to rapid corrosion failure. Appropriate selection based on operating conditions is necessary.
3. Core Differences Between ASTM A995 Gr. 4A and ASTM A182 F51 ANSI Y-type strainer
Both belong to the 2205 duplex stainless steel system. The core difference lies only in the manufacturing process and corresponding standards, as follows:
• ASTM A995 Gr. 4A: Follows the ASTM A995 standard and is a cast version of 2205 duplex stainless steel, primarily used for ANSI Y-type strainer components with complex structures (such as ANSI Y-type strainer bodies and covers).
• ASTM A182 F51: Follows the ASTM A182 standard and is a forged version of 2205 duplex stainless steel, emphasizing high strength and consistent performance. It is often used for ANSI Y-type strainer forgings with higher mechanical performance requirements.
4. Shortcomings of ASTM A995 Gr. 4A (Cast Version) Compared to ASTM A182 F51 (Forged Version)
4.1 Poor Performance Consistency and Microstructure Uniformity
The casting process has inherent limitations. During solidification, ASTM A995 Gr. 4A ANSI Y-type strainer are prone to defects such as component segregation, coarse grains, and localized porosity/venting. This leads to significant fluctuations in mechanical properties and corrosion resistance in different parts of the same batch or even the same ANSI Y-type strainer. Performance stability is far lower than that of the forged version of ASTM A182 F51 ANSI Y-type strainer. This shortcoming needs to be compensated for through rigorous heat treatment processes and non-destructive testing methods. 4.2 Slightly Inferior Low-Temperature Toughness and Plasticity
The elongation after fracture requirement for ASTM A995 Gr. 4A ANSI Y-type strainer is ≥20%, lower than that of forged ASTM A182 F51 ANSI Y-type strainer (≥25%). Its low-temperature toughness (especially for thick-section ANSI Y-type strainer) is more significantly affected by casting defects. If used in low-temperature conditions <-20℃, additional impact toughness verification is required, and the applicable low-temperature range is narrower than the forged version.
4.3 High Risk of Casting Defects and Strict Inspection Requirements
During the production process, this ANSI Y-type strainer is prone to casting defects such as shrinkage cavities, porosity, slag inclusions, and cold shuts. Since the ANSI Y-type strainer is a pressure-bearing component, mandatory non-destructive testing (UT), MT (magnetic particle testing), and PT (penetrating electrode testing) is required. The cost of defect detection and repair is high, and the overall failure rate is slightly higher than that of ASTM A182 F51 forged ANSI Y-type strainer.
Design Standard of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
Design Acc. to ASME B16.34 (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
Design Acc. to EN-12516-1/2 (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer)).
Test Standard of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
Test Acc. to API 598 (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
Test Acc. to EN 12266-1/2 (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer)).
Surface Finishing of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
All 2205 Y Type Strainer (UNS S31803 Y Type Strainer) surface is finely machined to achieve the required roughness and conforms to standard MSS SP-110.
Size of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
From DN1/4’’ to 48’’ (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
From DN8 to DN1200 (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer)).
Face to Face of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
Face to Face Acc. to ASME B16.10 (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
Face to Face Acc. to EN 558-1 (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer)).
Pressure Rating of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
ANSI Class 150 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 300 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 600 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 800 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 900 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 1500 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
ANSI Class 2500 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (ANSI Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 16 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 25 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 40 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 63 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 100 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 160 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 250 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 320 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer));
EN 1092 PN 400 2205 Y Type Strainer (UNS S31803 Y Type Strainer) (EN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer), DIN Standard 2205 Y Type Strainer (UNS S31803 Y Type Strainer)).
Working Temperature of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
Please refer to the "Temperature and Pressure Curve of 2205 Y Type Strainer (UNS S31803 Y Type Strainer)" for temperature and pressure changes.
Ends Connection of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
ANSI Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
ANSI Integral Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
ANSI Welded Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld (ASME B16.25) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld x ANSI Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
EN 1092 Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
EN 1092 Integral Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
EN 1092 Welded Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld (EN 12627) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld (ISO 1127) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld x EN 1092 Flange Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male NPT (ASME B1.20.1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPP (ISO 228-1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPT (ISO 7-1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male NPT x Female NPT Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPP x Female BSPP Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPT x Female BSPT Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male NPT x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPP x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Male BSPT x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female NPT (ASME B1.20.1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPP (ISO 228-1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPT (ISO 7-1) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Socket Weld (ASME B16.11) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Socket Weld (EN 12760) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female NPT x Socket Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPP x Socket Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPT x Socket Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld (ASME B16.25) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Butt Weld (EN 12627) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female NPT x Butt Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPP x Butt Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPT x Butt Weld Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female NPT x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPP x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Female BSPT x Long Butt Weld (+100 mm) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Long Butt Weld (+100 mm Weld Stub) Ends 2205 Y Type Strainer (UNS S31803 Y Type Strainer).
CE Marking of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
CE Marking is Available to 2205 Y Type Strainer (UNS S31803 Y Type Strainer) with a Diameter of DN32 or Larger.
Chemical Composition of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
For the Chemical Composition of 2205 Y Type Strainer (UNS S31803 Y Type Strainer), please refer to EN 10204 Type 3.1 certificate.
Mechanical Properties of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
For the Mechanical Properties of 2205 Y Type Strainer (UNS S31803 Y Type Strainer), please refer to EN 10204 Type 3.1 certificate.
Certificate of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
All 2205 Y Type Strainer (UNS S31803 Y Type Strainer) will be delivered with EN 10204 Type 3.1 Certificate.
Approvals of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
MSS SP-110 Certified of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
NACE MR 0175 Certified of 2205 Y Type Strainer (UNS S31803 Y Type Strainer)
API 607 Fire Safe Certified of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
ISO 9001 Certified of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
PED Certified of 2205 Y Type Strainer (UNS S31803 Y Type Strainer).
Available Upon Request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer):
NACE MR0175 is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
ATEX is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
TA-LUFT is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
SIL is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Degreasing is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Fire Safe is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Stem Extension is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer);
Double Block and Bleed is available upon request of 2205 Y Type Strainer (UNS S31803 Y Type Strainer).