Carbon steel is an iron amalgam in which carbon is the major alloying ingredient. usually, no extra alloying components are added to manage the material’s characteristics. Carbon steel is most commonly used for the sand casting technique to make the frame and rotor of a butterfly valve.
Carbon steels come in a multitude of grades. Cast categories LCC (Low Carbon Content) and ASTM A216 WCB (Weldable Cast B-grade) steels are the most commonly utilized for valve frames and discs. The WCB material is best suited for high heat resistance, whilst the LCC material may be utilized at low (sub-zero) degrees.
Cast carbon steel (ASTM A216, rating WCB) is commonly used for bigger valves ranging in size from 1-1/2 to 24 inches. This substance is made up of 30% carbon, 1% manganese, 0.05 phosphorus, 0.06 percent sulfur, and 0.06 percent silicon. It has the following material characteristics:
Tensile strength in psi……..70,000
36,000 psi yield strength
It is easily weldable and appropriate for use with steam, water, and gas.
Carbon steel has excellent mechanical qualities and is resistant to stress degradation and sulfides. Carbon steel offers different temperature resistance, as well as exceptional toughness and wears resistance. Used mostly in gate, globe, and check valves at temperatures up to 454oC.
The primary benefit of carbon steel is its low cost, and carbon steel valves provide such a cost-effective option in contexts where other features are seen as less essential than prices.
The primary drawback of carbon steel is:
The corrosion rate is poor. Surface coating, like paint, can be used to circumvent this if the mainline content does not erode the valve from within.
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