|
Alloy |
UNS Number |
SAE Number |
|
420 |
UNS42000 |
GENERAL PROPERTIES
Type 420 is a martensitic stainless steel that provides good corrosion resistance similar to 410 plus increased strength and hardness. It is magnetic in both the annealed and hardened conditions. Maximum corrosion resistance is attained only in the fully hardened condition. It is never used in the annealed condition.
RESISTANCE TO CORROSION
Type 420 provides full corrosion resistance only in the hardened or hardened and tempered. In these conditions, its corrosion resistance is similar to type 410.
PHYSICAL PROPERTIES
|
Melting Point |
Density |
Specific Gravity |
Modulus of Elasticity |
|
1450 - 1510 ℃ |
7.75g/cm3 |
7.7 |
200 GPa |
MECHANICAL PROPERTIES
|
Alloy |
Tensile Strength |
Yield Strength |
% Elongation |
|
420 Annealed * |
665 |
345 |
25 |
CHEMICAL PROPERTIES
|
Alloy |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
Cu |
Al |
Sn |
Fe |
|
420 |
0.15 |
1.00 |
1.00 |
0.04 |
0.03 |
12-14 |
0.50 |
0.50 |
0.50 |
0.15 |
0.050 |
Bal |
WELDING
Not commonly welded due to its air hardening characteristics. Welding may be performed after preheating to 300-400 F (149-204 C) with post weld tempering at temperature for 2 hours. Filler metal should be AWS E/ER420.
HEAT TREATMENT
Annealing – Grade 420 stainless steels can be heated at temperatures from 840 to 900°C, followed by slow furnace cooling at 600°C and then air-cooling. Process Anneal – Grade 420 can be annealed at 735 to 785°C and air-cooled.
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