A351 CF8C Stainless Steel Gate Valve - ANSI 150Lb, API 600, 2" to 24"
Tengs Valve supplies high-quality A351-CF8C Flanged Flexible Wedge Gate Valve, designed for reliable shut-off in corrosive and high-temperature pipeline systems. Manufactured in accordance with API 600 and API 6D, this cast stainless steel gate valve features flexible wedge, bolted bonnet construction, metal seat, and flanged (RF/FF) end connections. Available with handwheel, bevel gear, or bare stem operation. Ideal for chemical, petrochemical, oil and gas, and power generation applications where stainless steel is required for corrosion resistance.
150Lb A351-CF8C Stainless Steel Gate Valve Specifications
• Design Standards: API 600, API 6D
• End Connections: Flanged (RF, FF)
• Wedge Type: Flexible Wedge, Solid Wedge
• Bonnet Type: Bolted Bonnet (B.B.)
• Stem Type: Rising Stem (RS)
• Seat Type: Metal Seat
• Material: Stainless Steel A351-CF8C
• Trim Material: Stainless Steel, suitable for different service conditions
• Drive Type: Handwheel, Bevel Gear, Bare Stem
• Sour Condition: NACE MR 0175
• Size Range: 2″ to 24″ (DN50 to DN600)
• Pressure Rating: 150Lb, PN20
✓ CF8C (347 stainless steel) provides excellent resistance to intergranular corrosion at elevated temperatures up to 538°C
CF8C vs CF8 vs CF8M: Material Grade Comparison
| Grade | Equivalent Wrought | Key Alloying Element | Temperature Range | Typical Application |
|---|---|---|---|---|
| CF8 | AISI 304 | 18Cr-8Ni | -268°C to 649°C | General corrosive service, water treatment, food processing |
| CF8M | AISI 316 | 18Cr-10Ni-2Mo | -268°C to 649°C | Chemical processing, marine, petrochemical with chlorides |
| CF8C | AISI 347 | 18Cr-10Ni + Nb | -268°C to 649°C | High-temperature corrosive service, power plants, refineries |
Reference: ASTM A351. CF8C contains niobium (Nb) at minimum 8× carbon content, providing stabilization against intergranular corrosion at elevated temperatures.
Main Material List for 150Lb A351-CF8C Gate Valves
| Part Name | Material |
|---|---|
| Body | A351-CF8C |
| Bonnet | A351-CF8C |
| Disc / Gate | A351-CF8C |
| Seat | Integral |
| Stem | A182-F316 |
| Bolts / Nuts | B8M / 8M |
Reference: API 600, API 6D, ASTM A351. Materials may vary by model and pressure rating. Contact us for confirmed material certificate.
Typical Applications of A351 CF8C Stainless Steel Gate Valve
• High-temperature corrosive service: CF8C resists intergranular corrosion at continuous temperatures up to 538°C, ideal for refinery hydrogenation units and chemical solvent pipelines.
• Thermal power plants: high-pressure steam pipeline shutoff equipment requiring reliable isolation at elevated temperatures.
• Petrochemical and oil & gas: isolation valves for hydrogen, crude oil, and corrosive chemical medium pipelines.
• Chemical and pharmaceutical: acid, alkali, and solvent fluid control where standard 304/316 may not be sufficient.
• Water treatment and marine: anti-rust isolation for brine and chemically treated water piping.
• Sour service: available with NACE MR 0175 compliance on request.
FAQ - A351 CF8C Stainless Steel Gate Valve 150Lb
Q1: What is A351 CF8C stainless steel?
A: A351 CF8C is a cast austenitic stainless steel equivalent to AISI 347 wrought stainless steel. It contains niobium (Nb) as a stabilizing element at a minimum of 8 times the carbon content. This niobium addition prevents chromium carbide precipitation at grain boundaries, providing excellent resistance to intergranular corrosion at elevated temperatures up to 538°C.
Q2: What is the difference between CF8, CF8M, and CF8C?
A: CF8 is the cast equivalent of 304 stainless steel (18Cr-8Ni), suitable for general corrosive service. CF8M is the cast equivalent of 316 stainless steel (18Cr-10Ni-2Mo) with molybdenum for improved chloride resistance. CF8C is the cast equivalent of 347 stainless steel (18Cr-10Ni + Nb) with niobium stabilization for high-temperature resistance. CF8C is preferred for elevated temperature service where intergranular corrosion is a concern.
Q3: What are the pressure rating and size range?
A: This A351 CF8C gate valve is rated ANSI Class 150Lb (PN20), with sizes from 2″ to 24″ (DN50 to DN600). Other pressure ratings and sizes are available on request.
Q4: What end connections and actuation options are available?
A: End connections include flanged (RF, FF). Actuation options include manual handwheel, bevel gear, and bare stem for electric actuator. Other options are available on request.
Q5: What standards does this valve comply with?
A: Design and manufacture per API 600 and API 6D. Inspection and test per API 598. NACE MR 0175 compliance is available on request for sour service.
Q6: Why is CF8C preferred for high-temperature service?
A: At temperatures between 500°C and 800°C, standard austenitic stainless steels like CF8 and CF8M can become sensitized, leading to chromium carbide precipitation at grain boundaries and subsequent intergranular corrosion. CF8Cs niobium addition preferentially combines with carbon to form niobium carbides, preventing chromium depletion and maintaining corrosion resistance at elevated temperatures.
Get a Fast Quote for A351 CF8C Stainless Steel Gate Valve
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Email: sales@tengsvalve.com
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