What is SUS420F stainless steel? 

SUS420F "cutting tool grade" martensitic steel, the earliest stainless steel similar to Brinell high chromium steel. It is also used for surgical knives and can be made very shiny. SUS420F (13Cr-0.3C-high S) is a steel grade that improves the free cutting performance of SUS420J2 steel. SUS420F corresponds to Chinese GB Y3Cr13.

What is the chemical composition of SUS420F stainless steel?

Carbon C:0.26~0.40

Silicon Si:≤1.00

Manganese Mn:≤1.25

Sulfur S:≥0.15

Phosphorus P :≤0.060

Chromium Cr:12.00~14.00

Nickel Ni: allowed to contain ≤0.60

Molybdenum Mo: can be added ≤0.60

What are the mechanical properties of SUS420F stainless steel?

Tensile strength σb (MPa): quenched and tempered, ≥735

Conditional yield strength σ0.2 (MPa): quenched and tempered, ≥540

Elongation δ5 (%): Quenching and tempering, ≥12

Reduction of area ψ (%): Quenching and tempering, ≥40

Impact energy Akv (J): Quenching and tempering, ≥24

Hardness: annealed, ≤235HB; quenched and tempered, ≥217HB

What is the metallographic structure of SUS420F stainless steel?

Heat treatment specifications: 1) annealing, slow cooling at 800~900°C or rapid cooling at about 750°C; 2) quenching, oil cooling at 920~980°C; 3) tempering, rapid cooling at 600~750°C.

Metallographic structure: The structure is characterized by martensitic type.

What is the delivery status of SUS420F stainless steel?

Generally, it is delivered in a state of heat treatment, and the type of heat treatment is specified in the contract; if it is not specified, it is delivered in a state of no heat treatment.

How is the welding of SUS420F stainless steel? 

SUS420F  stainless steel, containing added elements such as nickel, molybdenum, vanadium, etc., is mainly used to increase the limited allowable working temperature of standard steel to higher than 1100K. When these elements are added, the carbon content also increases. With the increase of carbon content increases, the problem of avoiding cracking in the hardened heat-affected zone of the weld becomes more serious.

SUS420F stainless steel can be welded in the state of annealing, hardening and hardening and tempering. Regardless of the original state of the steel, a hardened martensitic zone will be produced near the weld bead after welding. The hardness of the heat-affected zone mainly depends on Depending on the carbon content of the base metal, when the hardness increases, the toughness decreases, and this area becomes more prone to cracks. Preheating and controlling the interlayer temperature are the most effective ways to avoid cracks. nature, post-weld heat treatment is required.

What are the characteristics of SUS420F stainless steel?

SUS420F  stainless steel is a type of stainless steel whose properties can be adjusted by heat treatment (quenching, tempering). Generally speaking, SUS420F  stainless steel is a type of hardenable stainless steel. This characteristic determines that this type of steel must meet two basic conditions: one is that there must be an austenite phase region in the equilibrium phase diagram, and heating for a long time within the temperature range of this region makes the carbides dissolve into the steel After that, quenching is carried out to form martensite, that is, the chemical composition must be controlled in the v or v ū phase region, and the second is to make the alloy form a corrosion-resistant and oxidation-resistant passivation film, and the chromium content must be above 10.5%.

How is SUS420F  stainless steel processed? 

Generally, stainless steel structural parts are often quenched and tempered to obtain high comprehensive mechanical properties.

The ferrite of SUS420F is minimized in the temperature range of 950°C-1100°C. Therefore, the quenching heating temperature is preferably 980°C-1050°C. organization after quenching. It is a small amount of ferrite + low carbon martensite. SUS420F can obtain a single-phase austenite structure at a temperature of 950°C-1150°C, and can obtain a martensite structure + a very small amount of retained austenite after quenching.

Tempering: SUS420F is 650°C-700°C, 2Cr13 is 640°C-700°C, tempered sorbite.

What are the benefits of SUS420F stainless steel?

A variety of uses in many industries around the world rely on stainless steel. One of the most popular types of stainless steel is SUS420F, a grade known for its excellent corrosion resistance and strength.

SUS420F stainless steel has many benefits. This steel is highly resistant to corrosion, making it ideal for use in a variety of industries and applications. In addition, SUS420F stainless steel is also non-magnetic, suitable for environments that do not require magnetic materials.

SUS420F stainless steel also has a higher temperature resistance than other types of stainless steel, making it ideal for use in high temperature applications. In addition, this steel can be welded and formed, making it versatile.

What are the applications of SUS420F stainless steel?

SUS420F stainless steel is used in some parts with high mechanical performance requirements and general corrosion resistance requirements. Some of the most common include:

Springs, steam turbine blades, cutting tools, nozzles, valve seats, valves/hydraulic machine valves, etc. This type of steel is used after quenching and tempering.