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ALLOY 20 (20Cb3) COMPOSITION

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Stainless Steel Alloy 20

Related Metals:

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

Specifications:

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

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

General Information

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 convention


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, pharmaceutica


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 rat


Corrosion Resistance

This alloy was designed primarily for resistance to attack by sulfuric acid solutions. Its high levels of Chromium, Nickel, Molybdenum and Copper, however, give it excellent resistance to pitting, stress corrosion cracking and intergranular corrosion. The


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 mos


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

Mechanical Data

MSO currently has no data available for this grade.

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