With more than 30 years of casting history, Wenzhou Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. We can produce castings of various sizes, shapes and materials according to the drawings provided by customers, especially in the field of valve castings. Cooperate with Fortune 500 companies for many years.
GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15，CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB Cr26.4A
Resin sand casting, etc.
Sales manager： Mrs.peng E-mail: firstname.lastname@example.org
Tel： 0086-0577-86621768 Fax： 0086-0577-86621935
Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,China
Valves are manufactured in ASTM A182 316/316L forgings and ASTM A351 CF8/CF3 castings. Trim components can also be in UNS S31600 and AISI-SAE 316/316L. Welded end valves can be in 316 but 316L is often preferred due to the lower carbon content which avoids inter granular corrosion in the as-welded state thereby providing superior corrosion resistance compared to 316. However 316 can be post-weld annealed to promote maximum corrosion resistance.
316 and 316L are molybdenum steels with enhanced resistance to pitting by solutions with chlorides and other halides. These grades offer tensile, creep and stress-rupture strength in higher-temperature applications. 316 and 316L offer better resistance to atmospheric and mild environments than 304 and 304L.
Design features 316/316L
· 316 is resistant to dilute solutions (1-5%) of sulfuric acid to 49ºC (120ºF), except in some oxidising acids, where 316 is less resistant than 304.
· 316 is susceptible to inter granular corrosion in the as-welded condition
· 316 is prone to carbide precipitation from 427ºC to 816ºC (800ºF to 1500ºF)
· Corrosion resistance can be restored by post-welding annealing
· 316L offers same composition but with less than 0.03% carbon
· 316L presents similar corrosion resistance and other characteristics as 316 but with added resistance to inter granular attack in the as-welded condition or with short exposures in the 427ºC to 816ºC (800ºF to 1500ºF) range.
· 316L is appropriate in applications where it's impossible to avoid exposure in the carbide precipitation range and when post-welding annealing isn't practical; lengthy exposure in this range may make the material brittle and susceptible to inter granular attack.
· 316 maximum temperature for scaling resistance is 899ºC (1650ºF) in continuous service and 816ºC (1500ºF) in intermittent service applications
· 316L has a slightly lower pressure rating at very high temperatures compared to 316
· Susceptible to stress-corrossion cracking
· Slightly magnetic in the cold-worked condition
· Nonmagnetic and non harden able in the annealed condition
· Enhanced resistance to chlorides