Venturi inner layer Stel
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Some venturi tubes have a Stellite coating on their inner layer. What kind of material is Stellite?
Coated with Stellite? Was it typed by mistake? I know that there are certain areas where it’s necessary to coat, weld on, or spray hard materials – such as Stellite, chromium carbide, or tungsten carbide, all of which are materials with very high hardness! It is generally used in flow channels with high flow rates or containing solid particles, as it is wear-resistant! I guess you mean this! Stellite is a translation of the English term Stellite; it is an alloy that primarily contains wear-resistant elements such as Cr. There are various types of this alloy, depending on the proportions of its components, making it suitable for different manufacturing needs! The latest method is spraying; in terms of adhesion and various other aspects, it’s not as good as spraying! Various special alloys: Chemical composition (%), Mechanical properties (kgf/mm²), Steel type. China: C%, Si%, W%, Cr%, Ni%, Mo%, Co%, Fe%, Others (%). σb [σ], Hardness, Main applications.
Stellite alloy: Stellite No.1 – 2.5, <2.00, 12, 30, <3.00, ——, Remaining amount <3.00, ——, 33, 8.25, 54HRC; Used for various tools, mixers, etc.
Stellite No.6 – 1, <2.00, 4, 28, <3.00, ——, Remaining amount <3.00, ——, 74, 18.5, 44HRC; Used as cladding material for valve seats and cores, as well as hard cladding materials.
Stellite No.12 – 1.35, <2.00, 8, 29, <3.00, ——, Remaining amount <3.00, ——, 53, 13.25, 47HRC; Used as cladding material for valve seats and cores, as well as nozzles, etc.
INCONEL alloys: INCONEL 625 – 0.05, 0.3, ——, 22, Remaining amount, 9, ——, 3; Cb4.0, Ti0.2, Al0.2, Mn0.15; 87, 21.75, 200HB; Used for components in nuclear reactors, components exposed to seawater, etc.
INCONEL 718 – 0.04, 0.3, ——, 18.6, Remaining amount, 3.1, ——, 18.5; Cb5.0, Ti0.9, Al0.4, Mn0.2; 146, 36.5, 363HB; Used for valve stems, sleeves, etc.
INCONEL X-750 – 0.04, 0.3, ——, 15, Remaining amount, ——, ——, 6.8; Cb0.9, Ti2.5, Al0.8, Mn0.7; 125.8, 31.45, 302; Used for wear-resistant parts such as metal sealing rings.
MONEL alloys: MONEL 400(M-M) – ≤0.3, ≤0.5, ——, ——, 63.0–70.0, ——, ≤2.5; Cu32.0, Mn≤2.0, S≤0.024; 49.2, 12.3, ——, Equivalent to JISH5701; Used for castings, parts resistant to seawater and brine, etc.
MONEL K-500(M-K) – ≤0.25, ≤0.5, ——, ——, 63.0–70.0, ——, ≤2.0; Cu30.0, Mn≤1.5, S≤0.01, Al2.8, Ti0.6; 91.4, 22.85, 250HB; Equivalent to JISH4553; Used for bars, high-strength bolts, shafts, etc.
Hastelloy alloys: Hastelloy B alloy – 0.1, 0.7, ——, 0.6, Remaining amount, 28, 1.25, 5.5; Mn0.8; 63, 15.75, 96HRC; Used for pickling equipment, acid- and corrosion-resistant valve bodies, etc.
Hastelloy C alloy – 0.07, 0.7, 4, 16, Remaining amount, 17, 1.25, 5.75; Mn0.8, V0.30; 77, 19.25, 96HRC; Used for pickling equipment, acid- and corrosion-resistant valve internals, etc.
Hastelloy W alloy – 0.06, 0.5, ——, 5, Remaining amount, 24.5, 1.25, 5.5; Mn0.5; 77, 19.25, 250HB.
Welding materials for Hastelloy alloys, INCONEL alloys, and dissimilar materials. (This table is sourced from the Internet and is for reference only!) ) This post was last edited by liuze78 on 2008-1-4 10:37 ]
Stellite alloy: Stellite No.1 – 2.5, <2.00, 12, 30, <3.00, ——, Remaining amount <3.00, ——, 33, 8.25, 54HRC; Used for various tools, mixers, etc.
Stellite No.6 – 1, <2.00, 4, 28, <3.00, ——, Remaining amount <3.00, ——, 74, 18.5, 44HRC; Used as cladding material for valve seats and cores, as well as hard cladding materials.
Stellite No.12 – 1.35, <2.00, 8, 29, <3.00, ——, Remaining amount <3.00, ——, 53, 13.25, 47HRC; Used as cladding material for valve seats and cores, as well as nozzles, etc.
INCONEL alloys: INCONEL 625 – 0.05, 0.3, ——, 22, Remaining amount, 9, ——, 3; Cb4.0, Ti0.2, Al0.2, Mn0.15; 87, 21.75, 200HB; Used for components in nuclear reactors, components exposed to seawater, etc.
INCONEL 718 – 0.04, 0.3, ——, 18.6, Remaining amount, 3.1, ——, 18.5; Cb5.0, Ti0.9, Al0.4, Mn0.2; 146, 36.5, 363HB; Used for valve stems, sleeves, etc.
INCONEL X-750 – 0.04, 0.3, ——, 15, Remaining amount, ——, ——, 6.8; Cb0.9, Ti2.5, Al0.8, Mn0.7; 125.8, 31.45, 302; Used for wear-resistant parts such as metal sealing rings.
MONEL alloys: MONEL 400(M-M) – ≤0.3, ≤0.5, ——, ——, 63.0–70.0, ——, ≤2.5; Cu32.0, Mn≤2.0, S≤0.024; 49.2, 12.3, ——, Equivalent to JISH5701; Used for castings, parts resistant to seawater and brine, etc.
MONEL K-500(M-K) – ≤0.25, ≤0.5, ——, ——, 63.0–70.0, ——, ≤2.0; Cu30.0, Mn≤1.5, S≤0.01, Al2.8, Ti0.6; 91.4, 22.85, 250HB; Equivalent to JISH4553; Used for bars, high-strength bolts, shafts, etc.
Hastelloy alloys: Hastelloy B alloy – 0.1, 0.7, ——, 0.6, Remaining amount, 28, 1.25, 5.5; Mn0.8; 63, 15.75, 96HRC; Used for pickling equipment, acid- and corrosion-resistant valve bodies, etc.
Hastelloy C alloy – 0.07, 0.7, 4, 16, Remaining amount, 17, 1.25, 5.75; Mn0.8, V0.30; 77, 19.25, 96HRC; Used for pickling equipment, acid- and corrosion-resistant valve internals, etc.
Hastelloy W alloy – 0.06, 0.5, ——, 5, Remaining amount, 24.5, 1.25, 5.5; Mn0.5; 77, 19.25, 250HB.
Welding materials for Hastelloy alloys, INCONEL alloys, and dissimilar materials. (This table is sourced from the Internet and is for reference only!) ) This post was last edited by liuze78 on 2008-1-4 10:37 ]
It should be a Stellite alloy; its chemical composition is Co45-53PTA. It is a cobalt-based surfacing powder of type Stellite12, with the following composition: C: 1.3-1.5%, Cr: 28-31%, W: 8-9%, Ni: 3%, Fe≤3%, Si: 1-1.5%, and Co: the remainder. The hardness level is HRC 45-53. This material is used for high-temperature and high-pressure valves, serrated surfaces, screw rods, etc. Coating the inner layer of a venturi with Stellite serves to harden the surface, thereby addressing issues such as cavitation, flashing, erosion, and abration. Some venturi tubes have a quite small inner diameter, so the spraying method mentioned on the second floor isn’t very suitable, haha.
This “Sita” was found in a question bank from a certain factory; I personally think it’s Staley, though I’m not entirely sure. :lol