1. Freeman valve is a Hastelloy C276 valve manufacturer. Hastelloy C276 valves manufactured by Freeman Valve have the following significant advantages:

1.1 Excellent corrosion resistance

① It has strong resistance to both oxidizing and reducing media (such as hydrochloric acid, sulfuric acid, phosphoric acid, chlorine, chlorides, etc.).

② Resistant to pitting, crevice corrosion and stress corrosion cracking (SCC), especially in chlorine-containing environments.

1.2 Stable high temperature performance

① It still maintains corrosion resistance and mechanical strength at high temperatures (up to about 1093°C).

1.3 Good processing and weldability

① It can be formed by conventional processes (such as welding, cold working), and no heat treatment is required after welding.

The following matters need to be noted when using Hastelloy C276 valves:

Hastelloy C276 valves are not suitable for strong oxidizing environments: for example, they may be corroded in strong oxidizing acids such as nitric acid and concentrated sulfuric acid.

2 Hastelloy C276 valves manufactured by Freeman valve have been widely used in the following five major fields:

2.1 Hastelloy C276 valves manufactured by Freeman valve have been widely used in the chemical and petrochemical fields. For example: reactors, heat exchangers, pipeline systems (especially involving hydrochloric acid, wet chlorine, and sulfur-containing environments).

2.2 Hastelloy C276 valves manufactured by Freeman valve have been widely used in environmental protection and flue gas desulfurization (FGD) fields. For example: chimney linings, washing towers and other acid-resistant parts.

2.3 Hastelloy C276 valves manufactured by Freeman valve have been widely used in the fields of ocean and seawater treatment. For example: seawater desalination equipment, submarine pipelines (resistant to chloride ion corrosion).

2.4 Hastelloy C276 valves manufactured by Freeman valve have been widely used in the pharmaceutical and food fields. For example: high-purity medium containers (corrosion-resistant and pollution-free).

2.5 The Hastelloy C276 valve manufactured by Freeman valve has been widely used in the energy industry. For example: nuclear power fuel assemblies, gas turbine components (high temperature corrosion resistance).

Summary

Hastelloy C276 valve is a benchmark for high-end corrosion-resistant alloy valves, suitable for harsh environments (such as high temperature, high chlorine, acidic media), but the cost and processing difficulty need to be weighed. Its irreplaceability is particularly prominent in the fields of chemical industry and environmental protection.

Corrosion performance of Hastelloy C276 valve in KOH (potassium hydroxide) environment

1. Freeman Valve's Hastelloy C276 valve has excellent performance in dealing with KOH (potassium hydroxide) corrosion:

1.1 Freeman Valve's Hastelloy C276 valve has excellent KOH (potassium hydroxide) corrosion resistance:

a. In KOH (potassium hydroxide) solution at room temperature or medium temperature (especially concentration ≤30%), Freeman Valve's Hastelloy C276 valve shows excellent KOH (potassium hydroxide) corrosion resistance, and its high chromium (Cr) and high molybdenum (Mo) content can effectively resist the erosion of KOH (potassium hydroxide).

b. Freeman Valve's Hastelloy C276 valve is less sensitive to stress corrosion cracking (SCC) caused by KOH (potassium hydroxide), which is better than ordinary stainless steel.

1.2 Hastelloy C276 valves produced by Freeman Valve have stability in high temperature KOH (potassium hydroxide) solution:

In high temperature (such as below 100°C) KOH (potassium hydroxide) environment, Hastelloy C276 valves produced by Freeman Valve can still maintain good corrosion resistance and are suitable for high temperature KOH (potassium hydroxide) solution treatment in chemical processes.

1.3 Hastelloy C276 valves produced by Freeman Valve have resistance to oxidation and reduction media in KOH (potassium hydroxide) solution:

The inertness of Hastelloy C276 valves produced by Freeman Valve makes their performance stable in the oxidation-reduction alternating environment of KOH (potassium hydroxide) solution (such as complex process media containing KOH).

1.4 Hastelloy C276 valves produced by Freeman Valve are resistant to local corrosion in KOH (potassium hydroxide) solutions:

Hastelloy C276 valves produced by Freeman Valve contain molybdenum (Mo) and tungsten (W), which enhance the ability to resist pitting and crevice corrosion of KOH (potassium hydroxide) and are suitable for KOH solutions containing impurities or Cl⁻ contamination.

2. When using Hastelloy C276 valves to deal with KOH (potassium hydroxide) corrosion, the following issues should be noted:

2.1 Limitations of Hastelloy C276 valves at high concentrations and high temperatures. In high-temperature (>120°C) and high-concentration (such as ≥50%) KOH (potassium hydroxide) solutions, the corrosion rate of Hastelloy C276 valves may increase significantly, and long-term use requires careful evaluation.

2.2 For pure KOH environments, some low-cost nickel-based alloy valves, such as nickel 200 valves, may be more cost-effective. The advantages of C276 valves are more reflected in complex environments containing impurities or mixed media.

3. Application recommendations for Hastelloy C276 valves:

3.1 Recommended scenarios: medium to low temperature, medium to low concentration KOH, or highly corrosive KOH (potassium hydroxide) solutions containing impurities such as Cl⁻ and sulfides.

3.2 Alternatives: If the environment is pure and the temperature/concentration of the KOH (potassium hydroxide) solution is low, nickel 200 valves can be considered to reduce costs.

3.3 Verification necessary: Before actual application, corrosion tests (such as ASTM G31) must be performed to confirm the performance under specific working conditions.

The corrosion performance of Hastelloy C276 valves in concentrated sulfuric acid (H₂SO₄ concentration ≥70%)

The corrosion performance of Hastelloy C276 valves in concentrated sulfuric acid (H₂SO₄ concentration ≥70%) is relatively complex, and its advantages and disadvantages can be summarized as follows:

Advantages

1.1 Hastelloy C276 valves produced by Freeman Valve have good tolerance in concentrated sulfuric acid (H₂SO₄ concentration ≥70%):

In sulfuric acid of medium concentration (about 50-80%) and medium temperature (≤50°C), C276 shows good corrosion resistance, especially when the sulfuric acid is pure and does not contain oxidizing impurities. Its high molybdenum (Mo≈16%) and chromium (Cr≈15%) content can form a stable passivation film.

1.2 The Hastelloy C276 valve produced by Freeman Valve is resistant to reducing acid corrosion in concentrated sulfuric acid (H₂SO₄ with a concentration of ≥70%):

In a reducing environment (such as low oxygen or no oxidant), the corrosion resistance of the Hastelloy C276 valve produced by Freeman Valve is better than that of ordinary stainless steel, because the Hastelloy C276 valve produced by Freeman Valve contains molybdenum, which can enhance the resistance to reducing acid.

1.3 The Hastelloy C276 valve produced by Freeman Valve is resistant to local corrosion in concentrated sulfuric acid (H₂SO₄ with a concentration of ≥70%):

The Hastelloy C276 valve produced by Freeman Valve has strong resistance to pitting and crevice corrosion that may be caused by concentrated sulfuric acid, thanks to the synergistic effect of the nickel matrix, molybdenum and chromium in the Hastelloy C276 valve produced by Freeman Valve.

Disadvantages

2.1 Limitations of Hastelloy C276 valves at high concentrations and high temperatures

In concentrated sulfuric acid with a concentration of ≥90% (especially at a high temperature of ≥100°C), the corrosion rate of Hastelloy C276 valves increases significantly and may exceed 0.5 mm/year (the upper limit acceptable to the industry). At this time, more corrosion-resistant materials such as high-silicon stainless steel (such as Alloy 20) or zirconium alloys need to be selected.

2.2 Sensitivity of Hastelloy C276 valves to oxidizing conditions

If concentrated sulfuric acid contains oxidizing impurities (such as Fe³⁺, Cu²⁺ or dissolved oxygen), the passivation film of Hastelloy C276 valves may be destroyed, resulting in accelerated corrosion. At this time, alloys containing tantalum (Ta) (such as C22) or tantalum materials are better.

3 Applicable recommendations

3.1 Recommended working conditions: sulfuric acid with medium and low concentrations (≤80%), low temperatures (≤50°C) and no oxidizing impurities.

3.2 Avoid working conditions: fuming sulfuric acid (containing free SO₃), high temperature (≥100°C) or highly oxidizing environment.

3.3 Alternative materials for Hastelloy C276 valves: Hastelloy B3 valves (pure reducing acid), zirconium alloy valves or high silicon material valves can be selected under extreme conditions.

4 Corrosion rate examples (data reference):

80% H₂SO₄, 30°C: <0.1 mm/year (C276 performs well)

98% H₂SO₄, 80°C: >1 mm/year (C276 is not recommended)

Therefore, the selection of Hastelloy C276 valves needs to be verified by experiments or corrosion databases (such as NACE or manufacturer manuals) based on specific working conditions (temperature, impurities, flow rate, etc.).

Hastelloy Valve's Alias, Similar Name, Another Name：

Hastelloy C276 Ball Valve, Hastelloy C276 Plug Valve, Hastelloy C276 Gate Valve, Hastelloy C276 Globe Valve, Hastelloy C276 Check Valve, Hastelloy C276 Butterfly Valve, Hastelloy C276 Strainer, Hastelloy C276 Safety Valve.

Hastelloy B3 Ball Valve, Hastelloy B3 Plug Valve, Hastelloy B3 Gate Valve, Hastelloy B3 Globe Valve, Hastelloy B3 Check Valve, Hastelloy B3 Butterfly Valve, Hastelloy B3 Strainer, Hastelloy B3 Safety Valve.

Hastelloy C22 Ball Valve, Hastelloy C22 Plug Valve, Hastelloy C22 Gate Valve, Hastelloy C22 Globe Valve, Hastelloy C22 Check Valve, Hastelloy C22 Butterfly Valve, Hastelloy C22 Strainer, Hastelloy C22 Safety Valve.

Hastelloy C4 Ball Valve, Hastelloy C4 Plug Valve, Hastelloy C4 Gate Valve, Hastelloy C4 Globe Valve, Hastelloy C4 Check Valve, Hastelloy C4 Butterfly Valve, Hastelloy C4 Strainer, Hastelloy C4 Safety Valve.

EN 2.4819 Ball Valve, EN 2.4819 Plug Valve, EN 2.4819 Gate Valve, EN 2.4819 Globe Valve, EN 2.4819 Check Valve, EN 2.4819 Butterfly Valve, EN 2.4819 Strainer, EN 2.4819 Safety Valve.

EN 2.4600 Ball Valve, EN 2.4600 Plug Valve, EN 2.4600 Gate Valve, EN 2.4600 Globe Valve, EN 2.4600 Check Valve, EN 2.4600 Butterfly Valve, EN 2.4600 Strainer, EN 2.4600 Safety Valve.

EN 2.4602 Ball Valve, EN 2.4602 Plug Valve, EN 2.4602 Gate Valve, EN 2.4602 Globe Valve, EN 2.4602 Check Valve, EN 2.4602 Butterfly Valve, EN 2.4602 Strainer, EN 2.4602 Safety Valve.

EN 2.4610 Ball Valve, EN 2.4610 Plug Valve, EN 2.4610 Gate Valve, EN 2.4610 Globe Valve, EN 2.4610 Check Valve, EN 2.4610 Butterfly Valve, EN 2.4610 Strainer, EN 2.4610 Safety Valve.

UNS N10276 Ball Valve, UNS N10276 Plug Valve, UNS N10276 Gate Valve, UNS N10276 Globe Valve, UNS N10276 Check Valve, UNS N10276 Butterfly Valve, UNS N10276 Strainer, UNS N10276 Safety Valve.

UNS N10675 Ball Valve, UNS N10675 Plug Valve, UNS N10675 Gate Valve, UNS N10675 Globe Valve, UNS N10675 Check Valve, UNS N10675 Butterfly Valve, UNS N10675 Strainer, UNS N10675 Safety Valve.

UNS N06022 Ball Valve, UNS N06022 Plug Valve, UNS N06022 Gate Valve, UNS N06022 Globe Valve, UNS N06022 Check Valve, UNS N06022 Butterfly Valve, UNS N06022 Strainer, UNS N06022 Safety Valve.

UNS N06455 Ball Valve, UNS N06455 Plug Valve, UNS N06455 Gate Valve, UNS N06455 Globe Valve, UNS N06455 Check Valve, UNS N06455 Butterfly Valve, UNS N06455 Strainer, UNS N06455 Safety Valve.

Main Features and Structure of Hastelloy Valve:

Reliable Sealing of Valve Stem;

Anti-static Structure;

Lock and Mis Operation Prevention;

Low Operating Torque;

Emergency Sealing Device;

Sealant Injection Device;

Reliable Seat Sealing Structure;

Single Sealing (Automatic Pressure Relief in Middle Cavity of Valve);

Double Sealing (Double Piston);

Safety Relief Device;

Social Structure of Automatic Pressure Relief Towards Upper Stream;

Blow out Proof Stem;

Corrosion Resistance and Sulfide Stress Resistance.

Design Standard of Hastelloy Valve:

Design Acc. to ASME B16.34 (ANSI Standard Hastelloy Valve);

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

Test Standard of Hastelloy Valve:

Test Acc. to API 598 (ANSI Standard Hastelloy Valve);

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

Surface Finishing of Hastelloy Valve:

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

Size of Hastelloy Valve:

From DN1/4’’ to 48’’ (ANSI Standard Hastelloy Valve);

From DN8 to DN1200 (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve).

Face to Face of Hastelloy Valve:

Face to Face Acc. to ASME B16.10 (ANSI Standard Hastelloy Valve);

Face to Face Acc. to EN 558-1 (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve).

Pressure Rating of Hastelloy Valve:

ANSI Class 150 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 300 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 600 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 800 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 900 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 1500 Hastelloy Valve (ANSI Standard Hastelloy Valve);

ANSI Class 2500 Hastelloy Valve (ANSI Standard Hastelloy Valve);

EN 1092 PN 16 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 25 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 40 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 63 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 100 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 160 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 250 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 320 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve);

EN 1092 PN 400 Hastelloy Valve (EN Standard Hastelloy Valve, DIN Standard Hastelloy Valve).

Working Temperature of Hastelloy Valve:

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

Ends Connection of Hastelloy Valve:

ANSI Flange Ends Hastelloy Valve;

ANSI Integral Flange Ends Hastelloy Valve;

ANSI Welded Flange Ends Hastelloy Valve;

Butt Weld (ASME B16.25) Ends Hastelloy Valve;

Butt Weld x ANSI Flange Ends Hastelloy Valve;

EN 1092 Flange Ends Hastelloy Valve;

EN 1092 Integral Flange Ends Hastelloy Valve;

EN 1092 Welded Flange Ends Hastelloy Valve;

Butt Weld (EN 12627) Ends Hastelloy Valve;

Butt Weld (ISO 1127) Ends Hastelloy Valve;

Butt Weld x EN 1092 Flange Ends Hastelloy Valve;

Male NPT (ASME B1.20.1) Ends Hastelloy Valve;

Male BSPP (ISO 228-1) Ends Hastelloy Valve;

Male BSPT (ISO 7-1) Ends Hastelloy Valve;

Male NPT x Female NPT Ends Hastelloy Valve;

Male BSPP x Female BSPP Ends Hastelloy Valve;

Male BSPT x Female BSPT Ends Hastelloy Valve;

Male NPT x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Male BSPP x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Male BSPT x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Female NPT (ASME B1.20.1) Ends Hastelloy Valve;

Female BSPP (ISO 228-1) Ends Hastelloy Valve;

Female BSPT (ISO 7-1) Ends Hastelloy Valve;

Socket Weld (ASME B16.11) Ends Hastelloy Valve;

Socket Weld (EN 12760) Ends Hastelloy Valve;

Female NPT x Socket Weld Ends Hastelloy Valve;

Female BSPP x Socket Weld Ends Hastelloy Valve;

Female BSPT x Socket Weld Ends Hastelloy Valve;

Butt Weld (ASME B16.25) Ends Hastelloy Valve;

Butt Weld (EN 12627) Ends Hastelloy Valve;

Female NPT x Butt Weld Ends Hastelloy Valve;

Female BSPP x Butt Weld Ends Hastelloy Valve;

Female BSPT x Butt Weld Ends Hastelloy Valve;

Female NPT x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Female BSPP x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Female BSPT x Long Butt Weld (+100 mm) Ends Hastelloy Valve;

Long Butt Weld (+100 mm Weld Stub) Ends Hastelloy Valve.

Operation of Hastelloy Valve:

Level Operation of Hastelloy Valve;

Handwheel Operation of Hastelloy Valve;

Gear Operation of Hastelloy Valve;

Series QF Electric Actuator Operation of Hastelloy Valve;

Series QU Electric Actuator Operation of Hastelloy Valve (ATEX);

Series RT Pneumatic Actuator Operation of Hastelloy Valve (Aluminum Body);

Series RT Pneumatic Actuator Operation of Hastelloy Valve (Marine Coating);

Series RT Pneumatic Actuator Operation of Hastelloy Valve (Stainless Steel Body).

CE Marking of Hastelloy Valve:

CE Marking is Available to Hastelloy Valve with a Diameter of DN32 or Larger.

Chemical Composition of Hastelloy Valve:

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

Mechanical Properties of Hastelloy Valve:

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

Functions of Hastelloy Valve:

Hastelloy Valve can be used for flow isolation – completely cutting off flow for maintenance or safety;

Hastelloy Valve can be used for flow regulation – controlling flow and pressure in process lines;

Hastelloy Valve can be used for backflow prevention – preventing reverse flow and protecting upstream equipment;

Hastelloy Valve can be used for pressure control – regulating and releasing system pressure;

Hastelloy Valve can be used for corrosion protection – resisting chemical attack from acids and chlorides;

Hastelloy Valve can be used for metering and sampling – enabling precise low-flow dosing and sampling.

Certificate of Hastelloy Valve:

All Hastelloy Valve will be delivered with EN 10204 Type 3.1 Certificate.

Brands of Hastelloy Valve:

Swagelok Hastelloy Valve

Parker Hastelloy Valve

DK-LOK Hastelloy Valve

Hamlet Let-Lok Hastelloy Valve

DUOLOK Hastelloy Valve

GYROLOK Hastelloy Valve

TYLOK Hastelloy Valve

BILOK Hastelloy Valve

Approvals of Hastelloy Valve:

MSS SP-110 Certified of Hastelloy Valve

NACE MR 0175 Certified of Hastelloy Valve

API 607 Fire Safe Certified of Hastelloy Valve

ISO 9001 Certified of Hastelloy Valve

PED Certified of Hastelloy Valve

Available Upon Request of Hastelloy Valve:

NACE MR0175 is available upon request of Hastelloy Valve

ATEX is available upon request of Hastelloy Valve

TA-LUFT is available upon request of Hastelloy Valve

SIL is available upon request of Hastelloy Valve

Degreasing is available upon request of Hastelloy Valve

Fire Safe is available upon request of Hastelloy Valve

Stem Extension is available upon request of Hastelloy Valve

Double Block and Bleed is available upon request of Hastelloy Valve

Key Applications of Hastelloy Valve:

Acidic Oil and Gas Conditions: Wellhead instruments, pressure taps, chemical injection pipelines, handling media containing hydrogen sulfide;

Flue Gas Desulfurization (FGD): Absorber towers, gypsum slurry circuits, sampling points, drain valves, manifold components, replacing easily pitted 316 stainless steel;

Chemical Metering Skids: Handling hydrochloric acid, sulfuric acid, chlorine, and mixed acids, achieving instrument isolation and calibration;

Hypochlorite/Bleaching Systems: Water treatment, papermaking, textiles, for instrument connections involving chlorine, chlorine dioxide, and hypochlorite media;

Offshore Oil and Gas and Subsea Engineering: Offshore platforms, submarine umbilical cables, hydraulic control systems, simultaneously in contact with seawater, methanol, and acidic hydrocarbons;

Pharmaceuticals and Food Processing: Withstands CIP in-situ cleaning acid-base cycles, ensuring material purity.