S235JR steel is a non-alloy structural steel specified under the European standard EN 10025-2. It is one of the most widely used steel grades in general construction and mechanical engineering due to its excellent balance of mechanical properties, weldability, and cost-effectiveness.
Chemical Composition of S235JR Steel
The chemical composition of S235JR steel is carefully controlled to ensure consistent mechanical properties and good weldability. The table below summarizes the key element limits:
| Element | Typical Value |
|---|---|
| Carbon (C) | 0.14 – 0.16% |
| Manganese (Mn) | 0.60 – 1.00% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.020% |
| Nitrogen (N) | ≤ 0.008% |
| Copper (Cu) | ≤ 0.30% |
The low carbon content (maximum 0.17%) is particularly important because it ensures excellent weldability without requiring preheating for most thicknesses. The controlled phosphorus and sulfur levels minimize the risk of hot cracking and improve toughness.
Mechanical Properties of S235JR Steel
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥235 MPa |
| Tensile Strength (Rm) | 360–510 MPa |
| Elongation (A) | ≥26% |
| Impact Energy (KV, +20°C) | ≥27 J |
| Hardness | ≤130 HB |
In addition to these strength properties, S235JR provides a minimum impact energy of 27 Joules at 20°C when tested in the longitudinal direction. This impact toughness ensures that the material will not behave in a brittle manner under normal service conditions at room temperature.
What are the properties of S235J2 steel?
Excellent Weldability: Due to its low carbon content and low impurity levels, S235J2 can be welded using all standard methods without preheating.
Cold Environment Performance: Unlike S235JR, which can become brittle and crack in freezing temperatures, S235J2 maintains its toughness down to -20°C.
Fully Killed Steel: During production, oxygen is removed from the melt. This results in a highly uniform chemical composition and better internal quality (fewer gas pockets or "blowholes").
Ease of Fabrication: It is easy to cut, bend, and machine.
Key Applications of S235JR Steel
S235JR steel is used across a remarkably wide range of industries and applications. The table below summarizes the key application:
| Industry | Specific Applications | Why S235JR is Chosen |
|---|---|---|
| Construction | Building frames, columns, beams, bracing | Good strength-to-cost ratio, excellent weldability |
| General Engineering | Machine bases, equipment frames, support structures | Easy to fabricate, readily available |
| Agricultural | Trailer chassis, plow frames, grain bin supports | Adequate strength, repairable, low cost |
| Infrastructure | Sign posts, light poles, guardrail supports | Sufficient strength for wind loads, easy field welding |
| Storage | Water tanks, ambient temperature fuel tanks, silos | Good weldability for leak-tight joints, ductility |
| Transportation | Truck chassis components, container frames | Formable, weldable, fatigue-resistant |
| Platforms & Walkways | Industrial mezzanines, access platforms, staircases | Can be formed into chequer plate, easy to attach railings |
| Energy | Support structures for solar panels, wind turbine towers (small) | Cost-effective for non-critical structural components |
In a word,S235JR steel is the reliable, cost-effective foundation of countless engineering and construction projects. Its key characteristics-excellent weldability, good formability, moderate strength, and low cost-make it the go-to choice for applications that do not require extreme temperatures, high corrosion resistance, or very high strength.
Why Choose GNEE's S235JR steel ?
1. Strict Quality Assurance & Standards
GNEE ensures that every piece of S235JR steel fully complies with the EN 10025-2 standard.And GNEE supports and welcomes inspections from independent bodies such as SGS, BV, or TUV to verify quality before shipment.
2. Comprehensive Inventory & Specifications
Whether you need standard plates or specialized structural shapes, GNEE maintains a massive inventory.
3. Professional Processing Services
GNEE is not just a trader; they offer a "one-stop" fabrication service, which reduces your production time and costs.
4. Global Export Expertise
With over 15 years of experience exporting to more than 120 countries (including the Middle East, Southeast Asia, Europe, and South America), GNEE understands international trade.And GNEE use professional export packaging (waterproof paper, steel belts, and wooden pallets) to ensure the steel arrives without rust or physical damage.
5. Competitive Factory Pricing
As a large-scale supplier with deep connections to major Chinese steel mills (like Angang, Wisco, and Shougang), by cutting out middleman layers, they provide high-quality S235JR at a cost-effective price point, helping you stay within budget for large-scale construction projects.
6. Technical Support & After-Sales
GNEE's technical team can help you decide if S235JR is the right choice for your environment or if you should upgrade to S235J2 (for cold climates) or S355JR (for higher strength).And GNEE is known for fast response times on quotes and a dedicated after-sales team to resolve any issues regarding quantity or specifications.
Contact now to get S235JR steel quote
| Material Grade | S235JR(1.0038) |
| Standard | GB,ASTM,DIN,JIS,NF,BS,ISO,ROCT |
| Thickness | 0.1mm-300mm or as required |
| Width | 1000-5000mm,such as 1220mm 1250mm 1500mm (as customer's required) |
| Length | 1-12m,such as 2440mm 2500mm 3000mm or as required |
| Surface | Black painting, varnish paint, anti rust oil, hot galvanized, cold galvanized, 3PE,ect |
| Technique | Hot Rolled /Cold Rolled |
| Application | Ship building Industry , building construction,bridge, architecture,pressure vessel steel,etc. |
| Trade Terms | EXW,FOB,CIF CFR |
| Loading Port | Shanghai port, Tianjin port, Qindao port |
| Payment terms | 1) 30% deposit by T/T, the balance against copy of B/L by T/T. |
| 2) 30% deposit by T/T, the balance by L/C at sight. | |
| 3) 100% L/C at sight. | |
| MOQ | 2 Ton |
| Packing Detail | Standard Seaworthy Package or customer requirements |
| Delivery time | 1.Usually,within10-20days after receiving deposit or LC. 2.According to the order quantity |
| Samples | Free samples are provided but the fright is borne by the buyer |
What is the difference between S235JR and S275JR steel?
S235JR has a minimum yield strength of 235 MPa, while S275JR has a minimum yield strength of 275 MPa. This means that S275JR is stronger than S235JR and is typically used for more demanding applications, such as heavy machinery, high-rise buildings, and large structures.
What does JR mean in S235JR?
S235JR: A frequently used type of steel, S235JR is known for its weldability, machinability, durability, and wear-resistance. Its "JR" suffix indicates that its minimum impact energy is 27 joules and that it underwent an impact test at 20°C.
What is the fatigue limit of S235JR?
For a variable load of 11.5 MPa, the fatigue life of the reference variant is 13,168 cycles on average. For the same level of variable load, the fatigue life of the variant with notches is 56,437 cycles, which amounts to a significant in- crease of 328.6%.
Is S235JR mild steel?
EN10025-2 S235JR mild steel is an European standard hot rolled non-alloy structural steel grade. EN10025-2 S235JR mild steel has good plasticity, toughness and weldability, certain strength and good cold bending properties.