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ST37 Carbon Steel Sheets and Plates
ST37 is where practicality meets performance. For fabricators, press shops, general contractors, and manufacturing facilities that process steel daily, ST37 sheets and plates represent the most dependable, cost-efficient, and process-friendly low-carbon steel in the DIN 17100 family.
The grade name is straightforward in the German engineering tradition: “ST” for Stahl (steel), and “37” referencing the minimum tensile strength class of 370 N/mm². What the name understates is the grade’s true value proposition — a maximum carbon content of just 0.17% that unlocks exceptional weldability without preheating, consistent cold formability without cracking risk, and clean machinability that keeps tooling costs low. In sheet and plate form, these characteristics are amplified: ST37 is routinely drawn, pressed, bent, roll-formed, laser-cut, and plasma-cut with minimal process complications.
In the current European classification, ST37 corresponds directly to S235 under EN 10025-2. It is also broadly comparable to ASTM A36 in the American system, though testing protocols and documentation requirements differ between standards.
Mechanical Properties
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 340 – 470 | MPa |
| Yield Strength (min.) | 235 | MPa |
| Elongation (min., 50 mm gauge) | 25 | % |
| Brinell Hardness | 105 – 135 | HB |
| Density | 7.85 | g/cm³ |
| Modulus of Elasticity | 210 | GPa |
| Thermal Conductivity | ~52 | W/m·K |
Chemical Composition
| Element | Max. Content (%) | Significance |
|---|---|---|
| Carbon (C) | 0.17 | Keeps CE low, enables no-preheat welding |
| Manganese (Mn) | 1.40 | Adds strength without raising hardenability |
| Phosphorus (P) | 0.045 | Controlled for ductility |
| Sulfur (S) | 0.045 | Controlled for toughness |
| Nitrogen (N) | 0.009 | Up to 0.012% where Al is added |
| Carbon Equivalent (CE) | ~0.35 | Excellent weldability range |
Sheet vs Plate — What to Specify
ST37 is available in both sheet and plate form, and the right choice depends on application requirements:
- Hot-Rolled (HR) Sheets & Plates — Produced by rolling at elevated temperature above the recrystallization point. Surface has a characteristic blue-grey mill scale. HR plates are the standard form for structural work, fabrication frames, and general engineering use. Thickness typically 3 mm and above.
- Cold-Rolled (CR) Sheets — Produced by cold reduction of HR coils, delivering tighter thickness tolerances, a smoother surface finish, and improved flatness. CR sheet is the standard choice for automotive body panels, precision enclosures, and any application where surface quality and dimensional consistency matter. Thickness range typically 0.5–3 mm.
- Pickled & Oiled (P&O) — Hot-rolled sheet that has been acid-cleaned and oiled to remove mill scale, providing an intermediate option between HR and CR for applications requiring improved surface before painting or coating.
Applications
ST37 sheets and plates serve as the raw material backbone of general manufacturing and fabrication:
- Automotive Body & Panels — CR ST37 sheet is pressed and drawn into body panels, doors, bonnets, and inner structural components requiring precise gauge and surface finish.
- Light Structural Fabrication — HR plates form mezzanine floors, staircase stringers, support gussets, and secondary structural elements in industrial buildings and plants.
- Agricultural Implements — Plough blades, harrow discs, feed bin panels, and trailer floors where robust sheet steel with easy field-weldability is essential.
- HVAC & Ducting — Thin-gauge ST37 sheet is formed into ventilation ducts, hoods, plenums, and air handling housings where forming ease and weld quality are the primary requirements.
- Steel Furniture & Shelving — Industrial shelving systems, locker frames, work surfaces, and storage equipment fabricated from CR or HR ST37 sheet.
- General Enclosures & Housings — Control panel enclosures, electrical cabinets, machine guards, and equipment housings where consistent gauge, surface, and weldability are key.
- Tanks & Bins (Ambient) — Low-pressure, ambient-temperature storage tanks, hoppers, and bulk material bins where pressure vessel certification is not required.
Weldability & Processing
- Weldability: ST37 sheet and plate is among the easiest steels to weld in any standard shop environment. MIG/MAG, TIG, SMAW, resistance welding, and spot welding all produce consistent results without the need for preheating in standard conditions. For thicknesses below 30 mm at ambient temperatures above 5 °C, no preheat is required. This dramatically reduces cycle time in high-volume fabrication environments.
- Cold Forming: ST37’s high elongation (≥ 25%) and low yield strength (235 MPa) make it ideal for progressive die stamping, roll forming, press braking, and deep drawing. Minimum cold bend radius is approximately 1–1.5× material thickness for 90° bends.
- Machinability: Low hardness (105–135 HB) allows high cutting speeds with HSS and carbide tooling. Drilling, milling, and turning operations produce clean chips and a good surface finish without special tooling requirements.
- Laser & Plasma Cutting: ST37 sheet and plate cuts cleanly and consistently on both laser and plasma cutting machines. Low carbon content minimizes edge hardening, and cut edges can typically be welded without further preparation.
Manufacturing Standards & Equivalents
- DIN 17100 — Primary standard
- EN 10025-2 (S235 equivalent)
- ASTM A36 (broadly equivalent)
- IS 2062 E250 (Indian equivalent)
- BS 4360 Grade 40A
Quality Assurance
- Mechanical Testing — Each batch of ST37 sheets and plates is tested to verify tensile strength (340–470 MPa), minimum yield (235 MPa), and elongation (≥ 25%). For the CR sheet, additional thickness tolerance and surface quality checks are performed to confirm compliance with the tighter dimensional requirements of cold-reduced material.
- Dimensional Accuracy — HR plates are verified for thickness, width, length, flatness, and squareness. CR sheets are additionally checked for gauge consistency across width and length, since uniform gauge directly affects press tool performance and stamped part quality.
- Weldability Tests — Representative weld samples are tested for joint strength and ductility to confirm no-preheat weld integrity for standard fabrication applications.
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