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What is the Difference Between S235JR and S235J2 Steel Plate?

Today, we’re talking all about the S235JR Plate, which may seem like an odd thing to do…

If you work in the manufacturing or engineering field, you’ve probably heard of this steel plate and all its benefits, but if you don’t work in these fields, you might be curious as to why this steel plate is so special—and more importantly, how you can use it on your next project.

Please keep reading to learn more about what S235JR Steel Plate is and the unique benefits it provides!

What Are CSA Standards For Steel Pipes?

Steel pipes manufactured to Canadian Standards Association (CSA) standards are designed for use in applications where there is exposure to moderately corrosive chemicals or a combination of both moderate corrosives and normal atmospheric conditions.

A list of standards for various carbon steel materials can be found on CSA’s website. Materials that meet CSA designations include A276 steel plate, A105 plate and numerous others based on their characteristics. ASTM also grades carbon steel but uses different numeric designations. For example, ASTM A40 pipe is equivalent to CSA G40 while ASTM-A53 alloy steel pipes are equivalent to CSA G53 pipes.

Durability of S235JR Vs. S235J2

When a steel contains 0.03% or less of sulfur it is referred to as stainless steel. These materials contain sufficient chromium to provide corrosion resistance in a variety of atmospheres.

Warehouse with rolls of sheet steel in industrial plant. Hardware manufacturing

The most common grade used for structural applications is ASTM A240/A240M, with a minimum chromium content of 16%. The S235jr plate features greater impact strength than that of the S235j2 plate while being equally resistant to cracking upon impact. S235jr plate is widely used in building and construction due to its high-strength characteristics, toughness, and weldability. It can be easily fabricated using conventional methods like welding, bending, cutting etc. It also offers excellent formability during the installation process because of its lower density.

Chemical Composition of Alloy Steels

S235jr steel plate is widely used for building ships, boats, offshore platforms, petroleum machinery and other engineering machinery. It usually refers to a kind of constructional hot rolled steel sheet containing Yield Strength 235 MPa and Tensile Strength 270~450 MPa; This means that they generally have the same mechanical properties as ASTM A569 Gr. A steel plate.

However, Alloy steels like Grade S235JR have lower sulfur content than A569 Gr. A (0.04~0.12%). Alloy Steels have better anti-corrosion performance than carbon steels because of their higher Cr contents. The C/Cr ratio can be improved by rolling alloy steel plates or through annealing after the quenching and tempering process, which increases yield strength up to 240-280MPa(32Ksi) from its original 200MPa(28Ksi).

Due to their high toughness and impact resistance under certain conditions, low-alloy grades can replace many medium-strength carbon grades in structural applications such as I beams or columns where good formability is also important.

Comparative Properties of Alloy Steels

Alloy steels are a group of low-carbon, nickel or chromium steel plate products. They offer a higher level of toughness than carbon or silicon steel at an equivalent strength level. Typically, alloy steels will be used in applications where high temperatures could cause problems for other types of steel products. Alloy steels also exhibit good resistance to atmospheric corrosion; but only in welded form.

Unwelded alloy steel products are susceptible to early corrosion once exposed to air or moisture. It’s important to have access to both compositional data as well as physical property information on any product you are considering for a project.

metal bar, steel construction materials on shelf closeup

When you’re working with plate materials like these, it can help to get specific datasheets that give more detailed information about your particular material choice. This datasheet gives very specific details about S235JR: For example, here we see that while its tensile strength ranges from 165-210 MPa (depending on whether it has been cold rolled), its yield point sits between 90 and 130 MPa. Also note that when rolling takes place after heat treatment (this is sometimes done to produce more consistent material properties), rolling should not exceed a 10% reduction if yield point values are maintained.

Conclusion

As you can see, with a few small differences between grades, there isn’t a huge difference in how these plates perform or why you should use one over another. While we normally recommend using S235JR due to its excellent properties when it comes to deformation and ease of processing, that’s not always possible.

If your needs call for greater strength from your steel plate than either grade alone can provide, then it’s up to you whether or not you want to take advantage of what adding both grades together has to offer. Remember: Just because some steelplate manufacturers don’t offer it doesn’t mean it won’t be right for your project.

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