Difference between S235 and S355? What is the difference between ST 37 and ST 52? why?

s235, s275, s355, s420 kaliteleri aras?ndaki farklar, s235jr ile s235j2 aras?daki fark nedir? s355jr ile s355 j2 aras?ndaki fark nedir?

What is the difference between S235 and S355 Steel Grades?

Structural steels, also known as S235 and S355 Mild steels, are the most common class of iron and steel. Some detailed information about the uses, mechanical properties and chemical compositions of steels (S235, S275, S355 and S420), which are among the most used grades, are given. we will give information.

S235 and S355 Structural Steel Applications?

S235 to S355 Structural steels, adequate qualities and low prices? due to qualification It is the most commonly used steel material compared to steels. This is due to structures. them? many different? makes it a reason for preference in the sectors. Every year, approximately % 25 of the structural steels produced in the world are used in the construction of buildings. It shows us how big the steel construction industry is. 2018 year? While Turkey's steel production was 37.3 million tons, 2018 Turkey's steel exports? and it was 21.3 million tons.

Mechanical engineers are resistant to high endurance or heavy loads. many special needs like resistor? non-machines prefer this when building.

S235 to S355 Sometimes against material wear resistance, low weight It's important to protect. This is the case with forestry and mining equipment, for example. Then, wear resistant materials like Hardox and Strenx. and high-strength steels are recommended.

Steel's Corrosion Protection

Structural steels against weather conditions. an additional layer of protection? need? exists. They are easily subject to atmospheric corrosion, so the coating of steels with antirust painting is not recommended. so protection? it is widely used. Remaining? For a coating, the metal surface must be pretreated (chemical etching or phosphating) and pre-cleaned (sandblasted, washed or wiped). This process is called sandblasting and painting. The steel material passed through the sandblasting painting machines is cleaned from the rust on the surface with thin steel balls, and then powder paint is sprayed and the paint sticks to a clean steel surface. provided.

Thus, steel is resistant to corrosion. will have a lifespan of at least 30 years. S235 to S355 steel grades. side of that? It is also possible to apply the method of hot-dip galvanized coating of steel, as well as a corrosion-resistant method with a longer life than paint. The hot dip galvanizing method is more costly than the sandblasting painting method. and it is the second preferred method of steel corrosion protection because it cannot be re-painted on the surface of the galvanized material.

antipas boyama, kumlama boyama, pasl? çelik, çeli?in paslanmas? süreci, Korozyondan koruma,Çeli?i koruma
antirust painting, sandblasting painting, rust? steel does not rust process, Corrosion protection, Steel protection

Despite the paint, corrosion finds its way and rusts the steel.
Structural steels against corrosion your protection is another durable? way is hot-dip galvanized. The quality and applicability of the zinc coating depends on the chemical composition of the steel – the percentage of phosphorus (P) and silicon (Si) is decisive:

Si + 2,5P <% 0.05 = 1st class quality
% 0.05 iSi + 2.5P?0.15% = bad result (Sandelin range???)
% 0.15 <Si + 2,5P <% 0,25 = 2. s?n?f kalite
% 0.25 <Si + 2,5P = kötü sonuç

In harsher conditions, for example in ports, stainless steels should be used instead. It is recommended.

Structural Steel Mechanical Properties

Structural Steel Mechanical Properties   Tensile strength, Rm, MPa (N/mm2) % 0.2 Yield strength, Rp0, 2min, (MPa) Brinell hardness, HB max
S235 360 ? 510 235 100 ? 154
S275 370 ? 530 275 121 ? 163
S355 470 ? 630 355 146 ? 187
S420 480 ? 620 420 143 ? 184

Are the materials different? If you do not know the mechanical properties, you can examine the table. The number in the name of the structural steel? ie 235 or 355 yield strength. Indicates the maximum load in MPa that does not end with plastic deformation. The pressure on this value? metal stay?c? will deform. In the case of S235 steel, this value is 235 MPa.S235 to S355 steel grades. Everything below causes deformation, so your details can regain their former shape after removing the load.

Tensile strength refers to the maximum load of the metal before it breaks. Continuing with the example of S235, this value is 360? It lies somewhere between 510 MPa. Although it is significantly higher than yield strength, yield strength is important when choosing the right material for your conditions. you should consider the value?s?n?z. This is because the tensile strength is exceeded. while it means deterioration, exceeding the yield strength? It only causes deformation.

Structural Steel Properties table?n?n increase in the number of quality? shows that it means higher power.S235 to S355 steels, most needs they met? are the most popular among those presented here for S275 it won't find much use and may be harder to find. S420 is suitable when looking for higher strength, but may not be readily available from every manufacturer. It can be found on special orders, especially for manufacturers such as Erdemir. It is not one of the qualities that we can evaluate as commercial quality.

All structural steels have very low hardness measurements. If necessary, these values can be improved by hardening. Of course, hardening will cause both cost and time loss. Due to this situation? Steel should be selected according to the place to be used and the difference between st 37 or st 52? should be preferred. S235 to S355 steel grades.

St 37 and St 52 Steel Classification and Impact Resistance?

Different before and after the numbers we explained earlier? You can find letters. Structural steels, pre-build? It has an S that represents structural steels. Different? There are several alternatives (eg P for pressure vessel steels) for applications. P group steels are generally pressurized. are referred to as vessel steels or boiler steels. Besides its high strength values, it is resistant to high temperatures. are steels.

Ferritic steels behave with temperature. it changes. They become more brittle at lower temperatures and slightly more ductile at higher temperatures. These and similar conditions should be taken into account when needed. A structure standing at -20°C in the cramps can become brittle as a result of a minor accident and cause a break in the steel. Therefore, you should choose a steel that has the right impact resistance and is suitable for the right climatic conditions.

Impact resistant? temperature
Impact code test power temp code Test temp???
J 27 J R +20 °C
K 40 J 0 0 °C
L 60 J 2 -20 °C

S235JR and S235L2 are different when they meet pulses? they behave. J indicates that it can be hit with a maximum energy of 27 Joules, K 40 Joules and L 60 Joules. R means that the minimum temperature for this capacity is at room temperature (20°C), where 0 is 0°C and 2 is -20°C. Therefore, the S235JR can only take a 27 Joules pulse at room temperature, while the S235L2 can take 60 Joules at -20°C. The video below about the Charpy impact test is well illustrated.

Name like S235J0 + N? when you compare it with a steel that is Normalization, crystal structure? to refine and distribute a more uniform grain size??l?m? It is a heat treatment method used on steel to provide It eliminates internal stresses and strains. This ensures the machinability and durability of steel without sacrificing hardness and strength. and increases its ductility.

Other bases you can see? Although there are suffixes, we limit ourselves to the most common ones. The last one is MC. S355MC steel is thermomechanically processed, combining its strength with properties suitable for cold forming such as bending.

S235, S275, S355, S420 Chemical composition

Composition Chemical content % quantity
S235 S275 S355 S420
Manganese (Mn) max 1,60 1,60 1,60 1,60
Silicon (Si) max 0.05 0.05 0.05 0.5
Carbon (C) max 0.22 0.25 0.23 0.12
Phosphorus (P) max 0.05 0.04 0.05 0.025
Sulfur (S) max 0.05 0.05 0.05 0.015

The exact chemical composition depends on the strength required. will change as. For example, weatherproof? be? stronger structural steel (eg S355W) required, slightly different from standard S355? will have chemistry.

Chemistry is almost the same? though different? The combination of production processes (rolling, processing and cooling) determines the final strength. For example, the more steel is rolled, the stronger it becomes.

Structural steels, eg steel grade?f? Better known as S355. However, every structural steel we talk about in this article has the MOST equivalent. The most common ones? reveal:

  • S235JR ? EN 1.0038
  • S235J2 ? EN 1.0117
  • S275JR ? EN 1.0044
  • S275J2 ? EN 1.0145
  • S355JR ? EN 1.0045
  • S355J0 ? EN 1.0553
  • S355J2 ? EN 1.0577
  • S420M? EN 1.8827

Which Steel Grade Should You Choose?

It really depends on your needs. Just base? metal parts? Will you cut it with a laser? Steel pieces cut later? Do you want to bend? What type of coating is required for corrosion? What kind of load does it carry? Where is it used?

Simply put, a better material costs more. In assemblies, different? material quantity?n? it's best to keep it to a minimum because otherwise any installation cost at final price is added.

The most common method for steel selection is yield strength. is worth it. Your needs can be calculated using structural analysis. An easy way to do this is to use the simulation options available in most 3D CAD programs. Critical points should still be checked by manual calculation to ensure at least the order of magnitude is correct.

Not everything comes in all sizes and thicknesses. Moreover, everything is out of stock. Cold rolled? sheets up to 3 mm, hot rolled over? you get sheets. Cold rolled? ones do a neater one? has the advantage. S355MC is a uniform structure if your structure requires steels thicker than 3mm. and provides good bending properties.

If you ask the S235, why are the 2 manufacturers the same? to the material? very different? You may be wondering what prices are offered. Someone may be offering you more quality. Exactly what metal was used? Make sure you know what you have achieved by asking. Details if you need quality? so ask about the chemical analysis. What we are all looking for if you need a low price? this is it :) search or ask us.