420 grade stainless steel, which is in the martensitic stainless steel group, determines the limits of its usage areas with its own characteristics. In general, the corrosion resistance of 420 grade stainless steel is at standard levels and in this respect it has similar properties with 304 and 310, but the income resistance of 420 grade stainless steel after heat treatment is high.
The chips formed in 420 grade stainless steel, which has a very high level of machinability when annealed after manufacturing, are easily broken and chip wrapping does not occur. After heat treatment, it is observed that 420 quality stainless steel reaches a very high surface hardness level.
In this respect, knives and similar products are produced with 420 quality stainless steel, which can be brought to an extremely hard and tight form. 420 quality stainless steel, which gains a serious physical resistance to both high pressure and impacts, also provides long-term use.
Corrosion Resistance (* * *)
420 grade stainless steel has a standard corrosion resistance. Due to its corrosion resistance, which can be considered below average, it is possible to see rusting in the material in environments with very high corrosion conditions. If there is a working environment where corrosion resistance is required, it is useful to prefer 304 grade stainless steel and 316 L grade stainless steel if corrosive liquids are in question.
Mechanical Properties (* * *)
Under annealed conditions, grade 420 stainless steel shows average mechanical properties. If supported by heat treatment, grade 420 stainless steel acquires an extremely strong mechanical structure. If strong mechanical properties are required without heat treatment, then alternatives can be considered. Grade 431 and 630 stainless steels with strong surface hardness without heat treatment are very good in this respect.
Malleability (* * * *)
In cases where a hard surface is required, 420 grade stainless steel is prone to forging and after forging and shaping, it has a very strong surface when heat treatment is applied. However, it is recommended not to forge 420 quality stainless steel after heat treatment because its structure becomes brittle.
Weldability Feature (* * * *)
420 grade stainless steel shows a successful performance in terms of weldability. This material continues to maintain its performance in environments where intensive welding is required and draws an above average profile. The point to be considered when welding the material is what kind of surface the 420 grade stainless steel is corroded to. To give an example, it is necessary to act carefully and sensitively when joining 420 grade stainless steel to 304 grade stainless steel by welding.
Machinability Feature (* * * *)
Although 420 grade stainless steel has a high carbon content, its machinability performance is quite good in the annealed condition. After 420 grade stainless steel is formed, its machinability level decreases after heat treatment to strengthen its surface.
On the other hand, when 420 grade stainless steel is annealed, the chip is easily broken and thus the possibility of encountering machining problems such as chip wrapping is largely eliminated. In general terms, 420 grade stainless steel, which is similar to 304 and 316 grade stainless steel with its machinability, is shaped once and heat treated.
Grade 420 stainless steel, which is one of the martensitic stainless steels, is extensively used in the machinery industry, food and food production industry, decoration and decorative material production, transportation sector, shafts and pistons, valves, petroleum and petrochemicals. Kitchen tools and utensils can also be made with stainless steel of this quality. It is a very good material for knife production.
C: 0.20% Mn: 1.0% Max
P: 0.04% Max S: 0.03% Max
Si: 1.0% Max Cr: %13.0
C: 0.30% Mn: 1.0% Max
P: 0.04% Max S: 0.03% Max
Si: 1.0% Max Cr: %13.0
C: 0.46% Mn: 1.0% Max
P: 0.04% Max S: 0.03% Max
Si: 1.0% Max Cr: %13.0
Mechanical Properties at Room Temperature
Quality: 420 (1.4021 - 1.4028 - 1.4034) X20Cr13 X30Cr13 X46Cr13
Tensile strength 800-950 MPa
Yield strength, (0.2%): 600 MPa
Quality Specifications
There are 2 preferred grades; 1.4028 (X30Cr13) and 1.4034 (X46Cr13) .
420 grade stainless is also coded as X20Cr13 in EN standards.
The prominent function of the steel is that it can be hardened by heat treatment.
420 model, after heat treatment, quite a lot of hardness stands out, and high resistance to friction also occurs in the treated products.
Products are in the stainless steel group.
It has an extremely comfortable workability feature. Another striking feature is that its chips are not simply breakable wrapping.
Stainless steels of this quality show their resistance to magnetized corrosion.
Stainless Steel 420
We know that stainless steels are in different classes. We have grouped them under 4 headings: austenitic, ferritic, martensitic and duplex. 420 quality stainless steel is in the martensitic group. Its usage areas have a fragile structure against low temperatures and are very good against high resistance and abrasion.
For example; It is used in various places such as knife production, medical instrument making, industry, mold parts, automotive industry, brake discs and pump parts. It resists weak acids and temperatures up to 700 degrees.
Its welding properties are generally not very good. However, the welding technique called crochet can be applied by heating or preheating between 300-350 degrees.
