S355JR channel steel is an essential structural component widely used in high-load applications such as dump trucks, cranes, trailers, transmission towers, excavators, port equipment, and steel structure projects.
S355JR channel steel
Known for its high strength, excellent weldability, and reliable load-bearing performance, S355JR structural channel steel is a preferred material in modern engineering.
Given its global popularity, many engineers and procurement teams often look for its equivalent in the JIS (Japanese Industrial Standards) system to facilitate local sourcing, design approval, or material substitution.
The Closest JIS Equivalent: SM490B
After analyzing chemical compositions and mechanical properties, the most accurate JIS equivalent to S355JR channel steel is JIS SM490B. In some general construction applications, JIS SS490 is also used as a reference, although SM490B steel channel offers better weldability, toughness, and closer structural performance matching.
For projects requiring Japanese standards, SM490B channel steel is widely recognized as the most practical alternative.
Chemical Composition Comparison of S355JR channel steel(%)
S355JR and SM490B are both low-carbon, high-strength structural steels with similar alloying elements, making them suitable for fabrication, welding, and heavy structural applications.
| Grade | C (Max) | Si (Max) | Mn (Max) | P (Max) | S (Max) | Cu |
|---|---|---|---|---|---|---|
| S355JR | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.55 |
| SM490B | 0.20 | 0.55 | 1.60 | 0.035 | 0.035 | - |
Lower carbon content in SM490B structural steel can contribute to improved weldability and reduced cracking risk during fabrication.
Mechanical Properties Comparison of S355JR channel steel
Both materials provide high tensile strength, ensuring the structural integrity of heavy-duty machinery, construction frames, and industrial support systems.
| Grade | Yield Strength (MPa Min) | Tensile Strength (MPa) | Elongation (Min %) | Impact Test |
|---|---|---|---|---|
| S355JR | 355 | 470 – 630 | 22% | 27J @ +20°C |
| SM490B | 325 | 490 – 610 | 17% | 27J @ 0°C |
While S355JR channel steel has a slightly higher yield strength, SM490B is often accepted as a substitute due to its excellent performance in similar structural applications and improved low-temperature toughness.
S355JR Channel Steel Dimensions & Weight Specification (UPN Series)
Below is the standard specification table for S355JR UPN Channel Steel. These are among the most common dimensions stocked by Gnee Steel for immediate shipment.
| Designation (UPN) | Height (h) mm | Width (b) mm | Web (tw) mm | Flange (tf) mm | Weight (kg/m) |
|---|---|---|---|---|---|
| UPN 80 | 80 | 45 | 6.0 | 8.0 | 8.64 |
| UPN 100 | 100 | 50 | 6.0 | 8.5 | 10.6 |
| UPN 120 | 120 | 55 | 7.0 | 9.0 | 13.4 |
| UPN 140 | 140 | 60 | 7.0 | 10.0 | 16.0 |
| UPN 160 | 160 | 65 | 7.5 | 10.5 | 18.8 |
| UPN 180 | 180 | 70 | 8.0 | 11.0 | 22.0 |
| UPN 200 | 200 | 75 | 8.5 | 11.5 | 25.3 |
| UPN 220 | 220 | 80 | 9.0 | 12.5 | 29.4 |
| UPN 240 | 240 | 85 | 9.5 | 13.0 | 33.2 |
| UPN 300 | 300 | 100 | 10.0 | 15.0 | 46.2 |
| UPN 400 | 400 | 110 | 14.0 | 18.0 | 71.8 |
Custom lengths, cut-to-size orders, and UPE channel steel (Parallel Flange Channel) sizes are also available upon request.
Why Choose Gnee Steel for S355JR Channel Steel?
As a professional steel supplier with decades of experience, Gnee Steel provides more than just raw materials. We understand the critical importance of material substitution, engineering compliance, and project delivery schedules.
Standard Compliance
Our S355JR channel steel fully meets EN 10025-2 standards, and we also provide JIS equivalent SM490B steel sections for projects requiring Japanese specifications.
Ready Stock
We maintain a massive inventory of UPN channels, UPE channels, and PFC channel sections in S355JR / S355J2 grades for fast delivery.
Certified Quality
All products are supplied with EN 10204 3.1 Mill Test Certificates (MTC) and can undergo third-party inspections such as SGS, BV, and TUV.
One-Stop Processing
We offer precision cutting, hole drilling, punching, welding, painting, and Hot-Dip Galvanizing to save you time and labor costs.
Global Logistics
Fast shipment from Tianjin and Shanghai ports with standard sea-worthy export packing ensures on-time delivery worldwide.
Consult with the Gnee Steel technical team today. We provide expert advice on S355JR equivalents, SM490B channel steel substitutes, structural channel selection, and help you choose the most cost-effective steel solutions for your region.
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What is the US equivalent of S355JR?
Both grades are often interchanged in international projects, but equivalence is not absolute. According to industry sources, A36 is frequently cited as the closest American equivalent to S235JR (a lower grade), while S355JR is more comparable to ASTM A572 Grade 50 due to higher strength.
What does S355JR mean?
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.
What is the difference between S355JR and A36?
EN 10025-2 S355JR and ASTM A36 are both fundamental structural steels, but they are not direct equivalents. S355JR offers significantly higher yield strength (355 MPa vs. 250 MPa) and guaranteed impact toughness, aligning it more closely with ASTM A572 Grade 50.
What is the ASTM equivalent of s335jr?
The most widely accepted and functionally equivalent ASTM equivalent to S355JR is ASTM A572 Grade 50. Both are high-strength, low-alloy (HSLA) structural steels used extensively in construction, bridges, and general fabrication.
What is the difference between S355JR and S355MC?
Strength level: S355JR steel usually has a minimum yield strength of 355MPa, and its tensile strength is 470-630MPa when the thickness is less than 16 mm. In comparison, S355MC steel has a higher yield strength, usually 355-510MPa, and a tensile strength of 430-550MPa.