S355JR can be replaced by Q355B?

Yes, S355JR can be replaced by Q355B in most structural applications, as they are considered functional equivalents with nearly identical mechanical properties and chemical compositions.

Key Comparison Points (2026 Standards)

• Yield Strength: Both grades require a minimum yield strength of ≥355 MPa (for thicknesses ≤16mm).

• Impact Toughness: Both grades are tested for impact energy (typically ≥27 Joules) at a temperature of +20°C. The "JR" in S355JR and the "B" in Q355B both signify this specific impact requirement.

• Chemical Composition: Under the latest Chinese standard GB/T 1591-2018, Q355B was specifically updated to align with the European EN 10025 standard (S355JR), allowing for "zero difference" in many engineering contexts.

Replacement Considerations

While they are equivalent, you should keep the following in mind for professional projects:

Project Specifications: Always confirm with the project's design authority or lead engineer before finalizing the swap.

Documentation: Ensure you receive the Mill Test Certificate (MTC) to verify the chemical and mechanical test results for the specific batch of Q355B.

Weldability: Although both have good weldability, slight differences in carbon equivalents may require adjustments to welding procedures in highly sensitive applications.

Equivalent Standards Reference Table

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What is Q355B material equivalent to?

ASTM A572 Grade 50

The Q355B equivalent ASTM material
The equivalent ASTM material for Q355B steel is ASTM A572 Grade 50. ASTM A572 Grade 50 is a structural steel with high strength and low alloy content that is widely utilized in structural applications.

What is equivalent to S355JR material?

S355JR equivalent grades have very close chemical composition and mechanical properties to that of S355JR steel. Both the S355JR equivalent grades Q345B, A572 Gr 50, ST52-3, SM490B and S355JR steel are main products of GNEE steel.

What is Q345B steel equivalent to?

These two steel materials Q345B steel plate and S355JR+AR steel plate are totally equivalent in chemical composition and mechincal properties from the following comparasion data table. S355JR steel grade can write as S355JR+AR,S355JR+N,S355JR+AR means S355jr steel materials rolled under As rolled,hot rolled.

What is S355JR steel?

S355JR is a grade of low-carbon steel commonly used in structural applications. It is part of the 'S' family of steels, which includes S235, S275, and S355 grades. The "JR" designation means that the material has been subjected to a Charpy V-notch impact test at 208℃ and has a minimum impact strength of 27 Joules.

Is S355 equivalent to A36?

S355JR and A36 are not directly equivalent, as S355JR has higher strength (yield 355 MPa vs. A36's 250 MPa) and guaranteed impact toughness, making it closer to ASTM A572 Grade 50 than A36. A36 is often equivalent to S235JR (yield 235 MPa), a lower EN grade.

What is the difference between S275JR and S355JR?

S275JR: Offers a minimum yield strength of 275 MPa for thicknesses up to 16 mm. This makes it suitable for applications where moderate strength is sufficient. S355JR: Provides a higher minimum yield strength of 355 MPa for thicknesses up to 16 mm, making it ideal for projects requiring greater load-bearing capacity.

What is the difference between Q345 and Q355B?

Q345B and Q355B are two different steels, and their main differences are as follows: Different properties: Q345 is a low-alloy steel, while Q355 is a low-alloy, high-strength structural steel widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, and other fields.