Carpenter 20

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Alloy 20
(Carpenter 20)

Delta Fastener Corp. can provide a wide variety of Carpenter 20 fasteners including; carpenter 20 nuts, carpenter 20 bolts, sockets, washers and more in Alloy 20 (Carpenter 20) fasteners. If we do not have your Carpenter 20 fasteners in stock (Inch or Metric) we can have these manufactured to your specification.

Material Notes:

Alloy 20 is a nickel-chromium-molybdenum stainless steel alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, and plastics industries. Alloy 20 resists pitting and chloride ion corrosion and its copper content protects it from sulfuric acid. Alloy 20 is not a SS but a nickel alloy (ASTM).

It is also known as Carpenter 20. Cast versions are designated CN7M.

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Other names

UNS N08020. DIN 2.4660, CN7M, Carpenter 20 CB 3TM AL 20TM Carlson Alloy C20TM Nickelvac 23TM Nicrofer 3620 NbTM


ASTM B729, B464, B366, B473, B462[1]

ASME SB729, SB464, SB366, SB473, SB462

ANSI / ASTM A555-79[2]

Composition by % Carbon 0.07 max
Chromium 19 - 21
Copper 3 - 4
Iron Balance
Manganese 2 max
Molybdenum 2 - 3
Nickel 32 - 38
Phosphorus 0.045 max
Silicon 1 max
Sulphur 0.035 max
Principal Design Features This alloy is a columbium stabilized material that combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. It particularly excels in resisting corrosion to hot sulfuric acids when compared to conventional stainless steels such as 316.
Applications Good availability at both the mill and distributor levels have made this a popular choice for a wide variety of applications. Included among these are: equipment for the manufacture of synthetic rubber, plastics, organic and heavy chemicals, pharmaceuticals, solvents and explosives, petroleum products, etc. Also employed in heat exchangers, mixing tanks, metal cleaning and pickling equipment and process piping.
Machinability Superior finishes may be obtained using set-up and process speeds and feeds normally employed in austenitic stainless steels such as 316 and 317. Slow speeds and heavy, constant feeds are the rules in working this alloy.
Forming To obtain maximum ductility, heat material to 2100 F(1149 C). Understand, however, that this process will adversely affect the stability of the material. Without this process, the material can be satisfactorily formed albeit with a high work hardening rate.
Welding Most commonly used welding methods with the exception of oxyacetylene welding have been successfully employed with this alloy. The presence of columbium tends to minimize the precipitation of carbides in the heat affected zone, so the material may, in most cases , be used in the "as welded" condition. Pre-heating is not required.
Forging Soak thoroughly at 2100-2250 F(1149-1232 C). Re-heat when temperature drops below 1800 F(982 C). After forging, reheat and soak completely at 1725-1850 F(941-1010 C) and quench rapidly in water or oil.
Hot Working This alloy can be successfully hot formed using forces similar to those required by austenitic stainless steels.
Cold Working This alloy can be successfully cold formed using all common practices. Its elevated strength may require higher forming pressures.
Annealing Soak thoroughly at 1725-1850 F(941-1010 C), water quench.
Hardening This material may only be hardened by cold work.



2. Carpenter 20 Wire, 30 Mesh Screen Data Sheet


Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.

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