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» Application » SS 304/304L Cast Valves | Petroleum Corrosion Data

SS 304/304L Cast Valves | Petroleum Corrosion Data

November 2, 2020

Petroleum Corrosion Resistance Data

API 6D cast ss304 gate valves

SS304 cast gate valves, API 6D, 4″ Class 150, RF flanged ends, OS&Y rising stem, handwheel operated,supplied to Riyadh, Saudi Arabia.

Stainless steel 304/304L cast valves denote valves with body and bonnet made of ASTM A351 Gr. CF8 or Gr. CF3 high-alloy austenitic castings. Both CF8 (304) and CF3 (304L) have the same nominal composition 18Cr-8Ni but different UNS designation, J92600 and J92500, respectively. The main difference is that CF3 has much lower carbon content. Another conventional cast steel is the plain carbon steel ASTM A216 Gr. WCB. With the addition of significant amounts of chromium and molybdenum, CF8 and CF3 have superior corrosion resistance to WCB castings. According to the empirical data, when tested in the environment of petroleum vapor under 175-psi pressure at 345°C [650°F], the corrosion rate of ss 304 casting (CF8), as measured by weight loss, is 2.1 mg per 1000 hours compared to 3040 mg per 1000 hours of WCB. Apparently cast stainless steel valves made of CF8 or CF3 can be used in such a corrosive environment.

Chemical Composition Requirements | CF8(304) & CF3(304L)

ElementCF8CF3
C≤0.08≤0.03
Mn≤1.50≤1.50
P≤0.040≤0.040
S≤0.040≤0.040
Si≤2.00≤2.00
Ni8.0-11.08.0-12.0
Cr18.0-21.017.0-21.0
Mo≤0.50≤0.50
*Both ASTM A351 CF8 & CF3 shall be solution annealed at a temperature no less than 1900°F [1040°C], followed by a quench in water.

Mechanical Properties | CF8(304) & CF3(304L)

ASTM A351CF8CF3
Tensile Strength,
min. MPa [ksi]
485 [70]485 [70]
Yield Strength,
min. MPa [ksi]
205 [30]205 [30]
Elongation in
2" min. %
3535
*Liquid penetration inspection may be done on the finished castings.

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