The low-temperature resistant Q355D and the S355JR series H-beams are both important materials commonly used in construction and engineering, each possessing unique characteristics and advantages.
Standards of Q355D and S355JR metal steel beam
Q355D: Conforms to the Chinese standard GB/T 1591-2018. Here, "Q" denotes yield strength, "355" indicates the yield strength value, and "D" represents the quality grade, which can pass the impact test at 20°C.
S355JR: Conforms to the European standard EN 10025. In this case, "S" stands for structural steel, "355" indicates the yield strength value, and "JR" specifies the impact toughness grade at 20°C.
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Chemical Composition Comparison of Q355D and S355JR construction steel beams
| Element | Q355D | S355JR |
|---|---|---|
| Carbon (C) | ≤ 0.18% | ≤ 0.22% |
| Silicon (Si) | ≤ 0.50% | ≤ 0.55% |
| Manganese (Mn) | ≤ 1.70% | ≤ 1.60% |
| Phosphorus (P) | ≤ 0.030% | ≤ 0.025% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.025% |
| Alloying Elements | Trace Nb, V, Ti | Trace Ti, Cr, Ni |
Physical Properties Comparison of Q355D and S355JR h section steel
| Property | Q355D | S355JR |
|---|---|---|
| Yield Strength | ≥ 355 MPa | ≥ 355 MPa |
| Tensile Strength | 470–630 MPa | 470–630 MPa |
| Elongation | ≥ 22% | ≥ 22% |
| Impact Energy | ≥ 34 J at -20°C | ≥ 27 J at 20°C |
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Our Application Case
Q355D Application Case:
In one of our recent bridge projects in northern China, we selected Q355D H-beams for the main girders due to their high strength and excellent low-temperature toughness.
These beams ensured the structure could withstand harsh winter conditions without compromising safety. Additionally, we used Q355D steel in the construction of a refrigerated storage facility and in certain pressure vessel components, where both strength and low-temperature impact resistance were critical.
S355JR Application Case:
For several high-rise commercial buildings and industrial plants, we utilized S355JR H-beams as the primary structural elements. The steel's reliable yield strength and good toughness made it ideal for multi-story frameworks.
S355JR was also chosen for secondary structures in bridges, as well as for wind turbine towers in renewable energy projects, demonstrating its versatility across various construction and engineering applications.
We offer high-quality Q355D and S355JR H-beams that combine strength, reliability, and precision for a wide range of construction and engineering projects.
Our Q355D H-beams are designed for structures requiring high strength and excellent low-temperature performance. Beyond their mechanical properties, we provide them in standard H-beam dimensions with tight tolerances, including flange width, web thickness, and overall height, to ensure seamless assembly and consistent load distribution.
Q355D H-beams
Typical manufacturing tolerances meet GB/T 11263-2017 standards, with flatness deviations ≤ 1/1000 of the beam length, and straightness controlled to ≤ 1/500 of the length.
Our S355JR H-beams are ideal for general construction and industrial applications. They are supplied in a variety of standard sizes and lengths, with dimensional tolerances according to EN 10034, ensuring precise fit and structural reliability. Surface quality is controlled to minimize burrs and deformation, making them suitable for welding, bolting, and heavy-load applications.
Both Q355D and S355JR H-beams are available in custom lengths and sizes to meet project-specific requirements. By combining superior material performance with precise manufacturing tolerances, our H-beams provide engineers and builders with the confidence that their structures will perform safely and efficiently.
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What is the US equivalent of S355JR?
Common equivalents include: S235JR: Equivalent to ASTM A36. S275JR: Equivalent to ASTM A572 Grade 42. S355JR/J2: Equivalent to ASTM A572 Grade 50.
What is grade S355JR?
S355JR steel has a high strength-to-weight ratio, making it suitable for use in load-bearing structures such as bridges, buildings, and offshore structures. It has a minimum yield strength of 355 N/mm², making it one of the strongest steel grades available.
Is S355J2 better than S355JR?
The primary evolution within this trio is: Basic toughness at room temperature (S355JR) → Enhanced toughness for cold climates (S355J2) → Enhanced toughness PLUS improved properties for critical fabrication (S355J2+N). Key Metric: Charpy V-Notch Impact Energy ≥ 27 Joules at +20°C.
What is the difference between S275JR and S355JR?
As to S275JR VS S355JR, actually they are totally not same thing. S275JR is carbon steel, while S355JR is low alloy steel. Both carbon steel S275JR and S355JR low alloy steel are under EN10025-2 standard. The S355JR low alloy steel is higher steel grade than carbon steel S275JR.
What type of steel is S355JR?
Steel grade S355JR is used to manufacture hot-rolled flat and long products, which are subsequently used when producing steel building structures. Classification: Non-alloy structural steel. Products: Flat and long products, semi-finished products.