Corrodur 4021 QT800

Alternative and trade names
Corrodur 4021, X20Cr13, 1.4021, 420, SUS 420J1, 20X133
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Description

1.4021 (X20Cr13) is used in the quenched and tempered condition in a host of constructional and fastener applications where moderate corrosion resistance is required. The knife blade variant of 1.4021 can be polished to high gloss finishes. Optimal corrosion resistance is also attained when the surface is finely ground or polished.

Related Standards

Equivalent Materials

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyValue

Density

7.7 g/cm³

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Dimension

PropertyValueComment

Diameter

160 mm

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max.

Mechanical

PropertyTemperatureValueComment

Charpy impact energy, V-notch

20.0 J

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Elastic modulus

20 °C

215 GPa

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100 °C

212 GPa

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200 °C

205 GPa

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300 °C

200 GPa

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400 °C

190 GPa

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Hardness, Brinell

230.0

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annealed

Tensile strength

800.0 - 950.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100 °C

0.0000105 1/K

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for 20°C to the mentioned temperature

200 °C

0.000011 1/K

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for 20°C to the mentioned temperature

300 °C

0.0000115 1/K

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for 20°C to the mentioned temperature

400 °C

0.000012 1/K

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for 20°C to the mentioned temperature

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Specific heat capacity

460.0 J/(kg·K)

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Thermal conductivity

30 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

6e-07 Ω·m

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Chemical properties

PropertyValue

Carbon

0.16 - 0.25 %

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Chromium

12.0 - 14.0 %

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Manganese

1.0

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Molybdenum

0.5

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Nickel

0.5

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Phosphorus

0.04

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Silicon

1.0

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Sulfur

0.01 - 0.03 %

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Technological properties

Property
Application areas

Automotive industry, Decorative Applications, Hydraulic Equipment, Petrochemical industry, Food and Beverage industry, Mechanical engineering, Cutlery, Blades

Corrosion properties

Average - Good corrosion resistance in moderately corrosive environments that are free of chlorides, such as soaps, detergents and organic acids. Good resistance in oxidising atmospheres up to temperatures of about 600 °C. 1.4021 is not resistant to intergranular corrosion in the asdelivered or as-welded conditions. PRE = 12.0 – 14.0

General machinability

Good - The machinability of this grade of stainless steel is directly related to its hardness. 1.4021 machines similar to carbon steels of the same hardness. Although it must be realised that the machining parameters will vary depending on the structure/hardness of the steel.

Heat Treatment

Soft annealing: 745-825°C (Cooling in furnace, air) - Hardening: 950-1050°C and quenching in air, polymer, oil - Tempering: 600-700°C

Hot forming

It is formable at 800-1100°C

Processing history

Quenched and tempered, QT 800

Welding

Good - Preheating of the work piece to a temperature within the range 100 °C – 300 °C is required as well as a post weld tempering treatment when welding is performed using a matching filler material. Generally, Novonit® 4551 is recommended when a filler material is required. Tempering at 650 °C after welding is recommended to restore some of the ductility in the weld zone. When using an inert or protective shielding gas during welding, care must be taken to avoid use of any hydrogen or nitrogen containing gases since contamination of the weld with nitrogen or hydrogen will adversely affect the mechanical properties. After welding the work piece must be cooled to below the martensite start (MS), temperature of approximately 120 °C before being tempered.