ST37-2 and S235JR are both structural steel grades commonly used in construction and engineering, but they originate from different standards and have slightly different properties. Here's a comparison:
ST37-2:
Originates from the DIN 17100 standard (German standard).
Widely used in Europe, especially in Germany.
S235JR:
Comes from the EN 10025-2 standard (European standard).
Commonly used across Europe.
Both ST37-2 and S235JR are low carbon steels, meaning they have a relatively low carbon content which enhances weldability and formability.
ST37-2:
Carbon content is around 0.17-0.20%.
Manganese content is around 0.35-0.40%.
S235JR:
Carbon content is up to 0.17-0.20%.
Manganese content is up to 1.40%.
Generally, the chemical compositions are quite similar, with slight variations depending on the source of the steel.
ST37-2:
Yield Strength: Around 235 MPa.
Tensile Strength: Approximately 360-510 MPa.
Comparable to S235JR but may have slight variations due to differences in standards and quality control.
S235JR:
Yield Strength: Minimum 235 MPa.
Tensile Strength: 360-510 MPa.
More consistently meets the specified mechanical properties due to more stringent modern European standards.
ST37-2:
Used in building construction, manufacturing of basic structures, and general engineering purposes.
Common in older structures, particularly in Germany and surrounding regions.
S235JR:
Similar applications to ST37-2 but more commonly used in modern European construction.
Preferred in applications requiring certified materials according to European standards.
Both ST37-2 and S235JR have excellent weldability and formability due to their low carbon content.
S235JR might have a slight edge in modern applications due to its adherence to the updated EN 10025-2 standard.
ST37-2 and S235JR are very similar in terms of composition and mechanical properties, with both being low carbon structural steels.
S235JR is the modern equivalent under the European EN 10025-2 standard and is generally preferred for new construction projects in Europe.
ST37-2 is a more traditional German standard, still used but less common in new construction compared to S235JR.
When choosing between the two, S235JR would typically be preferred for new projects due to its adherence to modern standards. However, ST37-2 is still applicable in many cases, especially where historical compatibility is important.
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