Stainless Steel - Grade 420CF / 1.4021

Description

420CF / 1.4021 is a martensitic stainless steel known for its excellent machinability and corrosion resistance. It is specifically designed for applications requiring high strength and moderate corrosion resistance, making it suitable for various industrial uses.

Chemical Composition

The chemical composition of 420CF typically includes:

Chromium (Cr): 12.0 - 14.0%

Nickel (Ni): ≤ 0.75%

Manganese (Mn): ≤ 1.0%

Silicon (Si): ≤ 1.0%

Carbon (C): 0.15 - 0.40%

Phosphorus (P): ≤ 0.04%

Sulfur (S): ≤ 0.03%

Mechanical Properties (Annealed)

The mechanical properties of 420CF are as follows:

Tensile Strength: 520 - 700 MPa

Yield Strength: 310 - 450 MPa

Elongation: 10 - 15%

Hardness: 45 - 50 HRC (after heat treatment)

Thermal & Physical Properties

Density:Approximately 7.75 g/cm³

Melting Point: 1400 - 1450 °C

Specific Heat Capacity: 0.5 J/g•K

Thermal Conductivity: 25.4 W/m•K

Other Designations

ASTM: A493

DIN: 1.4021

Fabrication and Heat Treatment

420CF can be fabricated using standard machining processes. It is often heat-treated to enhance its mechanical properties:

Heat Treatment Process:

Annealing: Heat to 870 - 900 °C, hold for 30 minutes, then air cool.

Hardening: Heat to 1000 - 1050 °C, quench in oil or air, followed by tempering at 200 - 300 °C.

Applications

420CF is widely used in applications such as:

Cutting tools

Surgical instruments

Valves and fittings

Food processing equipment

Supplied Forms

Bars

Wires

Features

High machinability

Good corrosion resistance

Excellent hardness and wear resistance after heat treatment

This datasheet provides a comprehensive overview of the 420CF grade, including its composition, properties, and applications, ensuring that it is suitable for a variety of industrial uses.

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