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stainless steel 445

Stainless steel grade 445 is one of the most widely used precipitation hardening grade steels. Although this material is soft and ductile in the solution annealed condition, it is very capable of good properties with a single precipitation or aging treatment. This steel possesses good corrosion resistance, high harness, toughness and strength.


Chemical Composition

The chemical composition of grade 445 stainless steel is outlined in the following table.

Element

Content (%)

Iron, Fe

Balance

Chromium, Cr

19-21

Silicon, Si

≤1.00

Manganese, Mn

≤1.00

Nickel, Ni

≤0.60

Phosphorous, P

≤0.04

Carbon, C

≤0.020

Sulfur, S

≤0.012


Mechanical Properties

The mechanical properties of grade 445 stainless steel are displayed in the following table.

Properties

Metric

Imperial

Tensile strength

427 MPa

61931 psi

Yield strength

205 MPa

29732 psi

Modulus of elasticity

190-210 GPa

27557- 30457 ksi

Poisson’s ratio

0.27-0.30

0.27-0.30

Elongation at break

22%

22%

Hardness

83

83

Manufacturing Process

The 445 stainless steel grade can be machined into long gummy chips. For heat treatment of this material, it must be soaked at 1038°C (1900°F) for 30 min and then cooled below 16°C (60°F) for complete martensite transformation. Common fusion and resistance methods can be used to weld grade 445 steel. Oxyacetylene welding should be avoided. AWS E/ER630 filler metal is recommended. The material has to be soaked for 1 h at 1177°C (2150°F) for performing forging. The material should not be worked below 1010°C (1850°F). Before final hardening, post-work solution treatment is required.

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