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420 (1.4021)

420 grade stainless steels have high tensile strength after heat treatment. Under normal conditions, this material has an average corrosion resistance. 420 is included in the martensitic stainless steel group. It is very good workable in its annealed state and the chip material of 420 materials which are annealed is easily broken and does not make any sawdust. This quality stainless material can be subjected to high surface hardness after heat treatment.

Grading Quality Characteristics

General features Point


Corrosion Resistance: This material with an average corrosion resistance can rust in very difficult conditions. It is recommended to use 304 stainless steel and 316L stainless steel in the presence of acid.
Mechanical Properties: This material, whose average mechanical properties are annealed, has a very strong mechanical structure after heat treatment. Those who do not want to deal with heat treatment and those who want a strong mechanical feature can prefer 431 quality or 630 grade stainless steel.

Vulnerability to be beaten:

Especially the hard surface like knife is shaped with a quality of 420 quality pounding and then it is subjected to heat treatment and it is provided to have a hard structure on its surface. This material has a more fragile structure after heat treatment and is not recommended for beating after heat treatment.
Weldability: This material with an average weldability property can be used even in an environment with intensive welding. The most important point during the welding of this material is what kind of material is the other surface to be welded. For example, when combining 420 to 304 quality stainless welding, it is necessary to be more careful and attentive.
Machinability of: In spite of the high carbon content, 420 grade stainless steel materials have a very good workability. However, after heat treatment, the ease of workability may be reduced slightly. The quality of the 420 grade material is very easy to chop and the chips are reduced to a minimum during processing.

NOTE: Scores are indicated on 5 and are intended to facilitate understanding of the nature of the material. It is only intended to make comparisons between qualities without relying on any value.


Usage areas 

420 grade stainless steel is often used in the machinery industry, petroleum and petrochemical industries, food and food production plants, decoration, transportation, sapphires, pistons and valves.

420 Quality Stainless Steel Material List
Material Type Min Diameter (mm)

Max Diameter (mm)

Stainless Steel Rod 5 300


Chemical Composition

Quality C Mn PA S Si Cr
420 (1.4021) 12:20 1.0 max 0.04 max 0.03 max 1.0 max


420 (1.4028) 12:30 1.0 max 0.04 max 0.03 max 1.0 max


420 (1.4034) 0:46 1.0 max 0.04 max 0.03 max 1.0 max




Mechanical Properties at Room Temperature

Quality 420 (1.4021 - 1.4028 - 1.4034) X20Cr13 X30Cr13 X46Cr13
Tensile strength 800-950 MPa (These values ​​apply only if the material is reclaimed (Quenched and Tempered) or if the material is heat-treated)
Yield strength, (0.2%) 600 MPa (These values ​​apply only if the material is reclaimed (Quenched and Tempered) or if the material is heat-treated)



Summary of Quality Characteristics

It is numbered 1.4021 quality stainless according to 420 stainless EN standard. There are two other versions of this stainless steel quality that are often used. These are 1.4028 (X30Cr13) and 1.4034 (X46Cr13) grade stainless steel materials.

420 grade stainless is also called X20Cr13 according to EN standard.

The most important feature of this quality stainless material is that it can be hardened by heat treatment.

420 (1.4021) grade stainless steel material has a high surface hardness after heat treatment and the heat treated material is resistant to friction.

This stainless quality is classified as martensitic stainless steel.

This stainless steel quality has a comfortable workability while tempered. The most important feature of the chips is easily broken and does not chip.

The stainless steel of this quality attracts magnets and has an average corrosion resistance.


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