Stainless steel round bars AISI 431/ EN 1.4057 / DIN X17CrNi16-2

Stainless steel round bars AISI 431/ EN 1.4057 / DIN X17CrNi16-2

AISI 431 is a martensitic stainless combining excellent impact strength at high hardness levels with the best

corrosion resistance of any martensitic stainless steels.

Designations

Chemical composition ( in weight % )

C      0.20 max

Mn   1.00 max

Si     1.00 max

Cr    15.0 - 17.0

Ni     1.25 - 2.50

P      0.04 max

S      0.03 max

Applications

Alloy 431 has been successfully used in a variety of aircraft and general industrial applications.

These include fasteners, bolts, valve components and chemical equipment.

Machinability 

In the fully annealed condition, 431 will gall and build up on the tools.

Good surface finishes are not easily obtained.

Welding 

Most electric welding procedures have proven successful with 431 stainless.

Filler metal should be AWS E/ER410.To avoid cracking, pre-heat the workpiece to 400-600°F (204-316°c). 

After air cooling, treat at 1200°F (649°c) to reattain maximum properties.

Hot working

Heat to 2100-2200°F (1149-1204°c) for best results. Do not work material below 1650°F (900°c).

Cold working 

This alloy is easily drawn, spun, headed, sheared and bent compared with other stainless steels.

Annealing 

1200-1250°F (650-677°c), furnace or air cool.

Tempering 

Temper for desired properties. Temperatures between 700-1050°F (371-565°c) will adversely affect impact

strength and corrosion properties.

Hardening 

1800-1950°F (982-1066°c), oil quench or ail cool for maximum properties.

Physical data 

Density (lb / cu. in.)    0.28

Specific Gravity    7.75

Specific Heat (Btu/lb/Deg°F - [32-212 Deg°F])    0.11

Electrical Resistivity (microhm-cm (at 68 Deg°F))    432

Melting Point (Deg°F)    2700

Modulus of Elasticity Tension    29

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