S235JR steel plate is one of the most widely used structural steels worldwide. As a professional steel manufacturer and supplier, GNEE offers high-quality S235JR steel and equivalent grades, including ASTM A36, DIN ST37-2, JIS SS400, and GBT Q235B.
S235JR steel plate
GNEE Steel is a manufacturer and supplier of S235JR steel plates and comparable structural steel grades. We provide customized cutting, inspection documentation, and processing services according to project requirements.
S235JR Steel Grade Equivalent Table
S235JR is commonly compared with several structural steel grades used under ASTM, DIN, JIS, and GB/T standards. However, these grades are not necessarily direct one-to-one equivalents. Their chemical composition, mechanical properties, impact requirements, and testing conditions may differ.:
| Steel Grade | Standard | Relationship to S235JR | Key Consideration | |
|---|---|---|---|---|
| S235JR | EN 10025-2 | Reference grade | European structural steel | |
| A36 | ASTM A36 | Comparable | Different chemical and mechanical requirements | |
| ST37-2 | DIN 17100 | Historical comparable grade | Older DIN designation | |
| SS400 | JIS G3101 | Comparable structural grade | Different Japanese standard requirements | |
| Q235B | GB/T 700 | Comparable structural grade | Chinese standard with different requirements |
Important: S235JR and the grades listed above should not be considered automatically interchangeable. Before substituting one grade for another, engineers should verify yield strength, tensile strength, chemical composition, impact requirements, thickness range, welding requirements, and project specifications.
Chemical Composition of S235JR and Comparable Grades
The chemical composition of S235JR and its equivalents ensures excellent weldability and structural reliability:
| Grade | C (≤16mm) | Si | Mn | P | S | Cu | N |
|---|---|---|---|---|---|---|---|
| S235JR | 0.19 max | - | 1.5 max | 0.045 max | 0.045 max | 0.60 max | 0.014 max |
| A36 | 0.26 max | 0.40 max | - | 0.040 max | 0.050 max | 0.20 min | - |
| ST37-2 | 0.21 max | - | - | 0.065 max | 0.065 max | - | 0.010 max |
| SS400 | - | - | - | 0.050 max | 0.050 max | - | - |
| Q235B | 0.20 max | 0.35 max | 1.40 max | 0.045 max | 0.045 max | - | - |
The chemical composition requirements shown below are for reference and should be verified against the applicable material standard, product thickness, and material certificate.
Mechanical Properties of S235JR and Equivalent Materials
Although these grades are frequently compared in structural steel selection, their specified properties are defined by different standards. S235JR is specified under EN 10025-2, while A36, SS400, Q235B, and ST37-2 are governed by ASTM, JIS, GB/T, and historical DIN requirements respectively. Therefore, grade substitution should be based on the complete project specification rather than yield strength alone.:
| Grade | Standard | Yield Strength | Tensile Strength | Charpy Requirement |
|---|---|---|---|---|
| S235JR | EN 10025-2 | 235 MPa* | 360–510 MPa* | 27 J at +20°C |
| A36 | ASTM A36 | 250 MPa* | 400–550 MPa* | Different requirement |
| ST37-2 | DIN 17100 | Standard-specific | Standard-specific | Not directly comparable |
| SS400 | JIS G3101 | 245 MPa* | 400–510 MPa* | No direct S235JR equivalence |
| Q235B | GB/T 700 | 235 MPa* | 370–500 MPa* | Standard-specific |
Values are shown for comparison only. Requirements vary according to the applicable standard, thickness, product form, and testing conditions.
Applications of S235JR Steel Plate
S235JR steel grade equivalent materials are widely used in structural and heavy machinery applications:
Building structures and bridges
Cranes, dump trucks, trailers, and bulldozers
Excavators and construction machinery
Oil & gas platforms
Offshore structures and industrial frameworks
Engineers favor S235JR and its equivalents because they balance strength, durability, and cost efficiency.
GNEE Steel supplies S235JR steel plates and comparable structural steel grades for international projects. Depending on project requirements, available services include customized cutting, surface treatment, material certification, and inspection support. Material documentation can include EN 10204 inspection certificates and relevant chemical and mechanical test results where applicable.
What is S235JR steel?
S235JR is a non-alloy structural steel grade specified in EN 10025-2. It is widely used for general welded and bolted structural applications where the specified strength, ductility, and impact properties are suitable.
What is S235JR equivalent to?
S235JR is commonly compared with structural steel grades such as ASTM A36, DIN ST37-2, JIS SS400, and GB/T Q235B. However, these grades are not automatically interchangeable because their chemical composition, mechanical properties, testing requirements, and standards differ.
Is A36 equivalent to S235JR?
A36 and S235JR are comparable structural steels, but they are not exact one-to-one equivalents. A36 is specified under ASTM A36, while S235JR is specified under EN 10025-2. Material substitution should be confirmed according to the required mechanical properties and project specification.
What does JR mean in S235JR?
In S235JR, "S" indicates structural steel and "235" refers to the specified minimum yield strength for the applicable thickness range. "JR" identifies the impact toughness requirement at +20°C.
What is the yield strength of S235JR?
S235JR has a specified minimum yield strength of 235 MPa for the applicable lower thickness range, while the minimum yield strength decreases for thicker products according to the applicable EN 10025-2 requirements.
Is S235JR mild steel?
S235JR is generally classified as a non-alloy structural steel and is commonly regarded as a low-carbon structural steel. It is widely used where good weldability and moderate structural strength are required.
What is the difference between S235JR and S355JR?
The main difference is strength. S235JR has a lower specified yield strength than S355JR, while S355JR is designed for applications requiring higher structural strength. The appropriate grade depends on design loads, thickness, fabrication requirements, and project specifications.