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ALLOY 904L COMPOSITION

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Stainless Steel 904L

Related Metals:

VLX904(tm)
AL 904L(tm)
Cronifer 1925 LC(tm)                                    

Specifications:

AFNOR Z2CNDU 25-20
ASTM B625
ASTM B649
ASTM B673
ASTM B674
ASTM B677
DIN 1.4539
UNS N08904

Chemistry Data

Carbon

0.02 max

Chromium

19 - 23

Copper

1 - 2

Iron

Balance

Manganese

2 max

Molybdenum

4 - 5

Nickel

23 - 28

Phosphorus

0.045 max

Silicon

1 max

Sulphur

0.035 max

General Information

Principal Design Features

904L is an austenitic stainless steel designed for moderate to high corrosion resistance. Its low carbon content improves cleanliness and weld strength.


Applications

Utility scrubber assemblies, acid and fertilizer production equipment.


Machinability

Slow speeds and positive feeds will minimize this alloy's tendency to work harden and glaze. Use chip breakers where possible to overcome problems with long draggy chips.


Corrosion Resistance

High levels of chromium, nickel, molybdenum and copper give 904L good resistance to stress corrosion cracking, chloride pitting and to reducing media such as hot phosphoric acid and dilute sulfuric acid. In these areas it is superior to 316 and 317 stain


Welding

Most common fusion and resistance methods may be employed. For maximum corrosion resistance, it is recommended to use filler metals of equal or higher alloy content.


Hot Working

Hot work should proceed after uniform heating to 2000-2200 F. Doe not work the material at less than 1800 F. Full annealing should follow any hot work to reattain maximum ductility and corrosion resistance.


Cold Working

Although higher forces are required, 904L will respond in a similar fashion to other austenitic stainless steels like 304, 316 or 317. Most common operations can be successfully performed.


Annealing

1920-1990 F (1050-1090 C), rapid cooling.


Hardening

This alloy does not respond to heat treatment.. It may only be hardened by cold reduction.


Physical Data

Density (lb / cu. in.)

0.285

Specific Gravity

7.9

Specific Heat (Btu/lb/Deg F - [32-212 Deg F])

0.12

Electrical Resistivity (microhm-cm (at 68 Deg F))

480

Modulus of Elasticity Tension

28.4

Mechanical Data

Form

Sheet

Condition

Test Specimen Annealed

Temper

70

Tensile Strength

87

Yield Strength

40

Elongation

50

Reduction of Area

55

Rockwell

B79

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