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Valve body material selection (Part 2)

publish:2025-07-07 10:05:07   views :3
publish:2025-07-07 10:05:07  
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1. High temperature/high pressure medium

Steam (>200℃)  

A. Low pressure steam: carbon steel (WCB), 304 stainless steel

B. High pressure steam (>10 MPa): chrome-molybdenum steel (WC6, WC9), stainless steel CF8M (316)  

C. Supercritical steam (>600℃): Inconel 625, silicon carbide ceramic (SiC)  

High temperature gas (such as flue gas)  

Material: 310S stainless steel, Incoloy 800H, silicon carbide ceramic  

- Note: Sulfur-containing flue gas requires sulfide corrosion-resistant materials (such as high nickel alloy).


2. Oil medium

Crude oil/lubricating oil Material: carbon steel (WCB), 316 stainless steel, monel alloy  

- Note: Sulfur-containing crude oil requires sulfur-resistant materials (such as Monel or duplex stainless steel).

Fuel oil/gasoline Material: cast steel, 316 stainless steel, fluororubber lined valve  

- Note: Avoid copper alloys (may catalyze oxidation).


3. Strong oxidizing media

Chlorine (Cl₂, dry/wet)

A. Dry chlorine: carbon steel, 304 stainless steel (strictly anhydrous)

B. Wet chlorine: titanium alloy, Hastelloy C-276, PTFE lined valve - Note: Wet Cl₂ is extremely corrosive to stainless steel.

Oxygen (O₂) Material: stainless steel 316L (needs degreasing), copper alloy (anti-spark)

- Note: Oil-free design to avoid high flow rate causing explosion.


4. Slurry/abrasive media

Mineral slurry/mud Material: tungsten carbide (WC) coated valve body, silicon nitride ceramic (Si₃N₄), duplex stainless steel

- Note: The valve core can be made of ceramic or hard alloy to improve wear resistance.

Liquid containing particles Material: rubber lining (such as natural rubber), ultra-high molecular weight polyethylene (UHMWPE)

- Note: particle size and hardness affect material selection.


5. Cryogenic media (such as LNG, liquid nitrogen) Materials: Austenitic stainless steel (304L, 316L), aluminum alloy (5083), 9% nickel steel

- Note: Avoid carbon steel (low temperature brittleness), and the sealing material must be resistant to low temperatures (such as PTFE).


6. Food/medical grade media materials: 316L stainless steel (electrolytic polishing), PTFE lining, sanitary ceramics

- Note: The surface roughness must meet FDA standards, and there is no dead angle design.


7. Special media

Hydrofluoric acid (HF) Materials: Monel alloy (Monel 400), platinum lining, tungsten carbide

- Note: Glass and ceramics (react with HF) are prohibited.

Molten metal (such as aluminum liquid) Materials: Silicon carbide ceramics, molybdenum alloy (Mo-50Re)

- Note: Anti-oxidation coating is required to avoid high temperature oxidation.


8. Summary of material selection principles.

Corrosiveness: Preferentially select materials that are chemically inert to the medium (such as Hastelloy to strong acid).

Temperature/pressure: For high temperature and high pressure, choose high-strength alloys or ceramics, and for low temperature, choose austenitic stainless steel.

Wear resistance: For slurry media, choose ceramics or cemented carbide coatings.

Economy: For non-corrosive environments, carbon steel or cast iron can be used to reduce costs.

Process requirements: For precision working conditions, processing performance must be considered (such as the difficulty of titanium alloy welding).

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