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ALLOY C20 (N08020)


The following specifications cover Stainless Steel Alloy 20

  • AISI 664
  • ASTM B366
  • ASTM B462
  • ASTM B463
  • ASTM B464
  • ASTM B468
  • ASTM B471
  • ASTM B473
  • ASTM B474
  • ASTM B475
  • ASTM B729
  • DIN 2.4660
  • UNS N08020

Property Results

Related Metals:

  • Carpenter 20 CB 3(tm)
  • Nicrofer 3620 Nb(tm)
  • Carlson Alloy C20(tm)
  • AL 20(tm)
  • Nickelvac 23(tm)


Chemistry Data : 

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.

Physical Data : 

Density (lb / cu. in.) 0.292
Specific Gravity 8.055
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.12
Electrical Resistivity (microhm-cm (at 68 Deg F)) 651
Poissons Ratio 0.31
Magnetic Permeability 1.002
Modulus of Elasticity Tension 28



Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.