Project Description
E355 Seamless Steel Tube — Overview
E355 (1.0580) is a non-alloy quality steel seamless circular tube specified under EN 10297-1 for mechanical and general engineering purposes. Designation “E” identifies a non-alloy steel grade, and “355” denotes the minimum yield strength of 355 MPa in the normalised delivery condition. With elevated manganese (Mn ≤ 1.60%) and carbon (C ≤ 0.22%) limits, E355 delivers the highest strength among EN 10297-1 non-alloy grades without requiring microalloying. Its balanced strength–ductility profile, refined grain structure from fully killed steelmaking practice, and excellent weldability make it the preferred choice for hydraulic cylinders, pneumatic systems, and demanding mechanical assemblies. FUSHUN METAL supplies EN 10297-1 E355 seamless tubes under ISO 9001 and AS9120B certified quality management, with full traceability per EN 10204 Type 3.1 certification. Every heat undergoes incoming optical emission spectrometry verification and dimensional conformity checks before dispatch. As the top non-alloy grade in the EN 10297-1 series commonly stocked, E355 bridges the gap to microalloyed grades such as E470, offering an optimised cost-strength ratio for volume production environments.
Equivalent Grades of E355
EN 10297-1 E355 (1.0580) maps to the following international standards. These are functional equivalents based on comparable chemical composition and mechanical properties; consult the relevant standard for the specific application.
| Standard | Grade | Remarks |
|---|---|---|
| DIN | St52, St52-3 | Closest legacy German equivalent; common in hydraulic cylinder applications |
| BS | S355J2H | Structural hollow section grade with comparable strength |
| ASTM | A572 Gr.65 | Similar yield class; verify shape and delivery condition |
| JIS | SS540, STKM 16A | SS540 for general structure; STKM 16A for machine structural use |
| GOST | St6sp, St60F | Russian structural carbon steel equivalents |
| ISO | Fe510, Fe590 | ISO mechanical steel grades based on tensile strength |
Typical Applications of E355 Seamless Tubes
Hydraulic cylinder barrels, piston rods, pneumatic cylinders, accumulators, telescopic cylinders, and high-pressure oil lines. E355 is the industry-standard grade for honed and SRB-finished cylinder tubes. FUSHUN METAL supplies E355 with tight ID tolerances for honing-ready applications.
Shock absorber outer tubes, suspension strut housings, steering columns, axle sleeves, propeller shaft tubes, torque tubes, and roll cage tubing. E355 high strength-to-weight ratio suits chassis and drivetrain applications.
Textile machinery rollers, printing press cylinders, spinning frames, machine tool spindles, guide columns, and injection moulding machine tie bars. E355 provides consistent mechanical properties for precision rotating and sliding components.
Transmission shafts, coupling sleeves, distance bushes, bearing housings, spacer rings, and structural hollow sections. FUSHUN METAL supplies E355 in hot-finished and cold-finished conditions for multi-purpose engineering use.
Structural columns, bracing members, crane booms, scaffolding tubes, utility poles, and framework for heavy equipment shelters. E355 offers an economical alternative to S355 structural hollow sections.
Gas transmission lines, water supply pipes, oil well casing components, heat exchanger tubes, and geothermal piping. E355 weldability and toughness suit moderate-pressure energy sector applications.
Supply Range of E355 Seamless Tubes
FUSHUN METAL supplies EN 10297-1 E355 seamless tubes across three manufacturing routes from ISO 9001 and AS9120B-certified production lines, with incoming dimensional verification on every batch.
| OD Range | 26.9 – 660 mm |
| WT Range | 2.5 – 75 mm |
| Length | 4,000 – 16,000 mm |
| Condition | +N / +AR |
| OD Range | 8.0 – 220 mm |
| WT Range | 1.0 – 30 mm |
| Length | 4,000 – 14,000 mm |
| Condition | +C / +SR / +LC |
| OD Range | 6.0 – 120 mm |
| WT Range | 0.5 – 15 mm |
| Length | 4,000 – 12,000 mm |
| Condition | +CR / +N |
Custom cut-to-length, bevel end, plain end, and protective chamfer available. Standard packing: hexagonal bundles with steel straps and weatherproof wrapping for sea freight.
Chemical Composition of E355
Ladle analysis limits per EN 10297-1 for E355 (1.0580). FUSHUN METAL verifies each heat via optical emission spectrometry as part of incoming quality control. The higher Mn limit (1.60%) compared to E315 (1.50%) and E275 (1.40%) provides additional solid-solution strengthening to achieve 355 MPa minimum yield.
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Content (max %) | 0.22 | 0.55 | 1.60 | 0.030 | 0.035 |
Aluminium content (Al ≥ 0.020%) is required for fully killed fine-grain practice under EN 10305-1 precision tube applications. No intentional addition of Cr, Ni, Mo, Cu, Nb, V, or Ti is specified for this non-alloy grade.
Mechanical Properties of E355
Properties in the standard normalised (+N) delivery condition per EN 10297-1 at room temperature. FUSHUN METAL issues EN 10204 Type 3.1 certified mill test reports with every shipment.
| Wall Thickness t (mm) | Yield Strength ReH (MPa) | Tensile Strength Rm (MPa) | Elongation A (%) |
|---|---|---|---|
| t ≤ 16 | ≥ 355 | 490 – 630 | ≥ 22 (longitudinal) ≥ 20 (transverse) |
| 16 < t ≤ 40 | ≥ 345 | 490 – 630 | |
| 40 < t ≤ 65 | ≥ 335 | 490 – 630 | |
| 65 < t ≤ 80 | ≥ 315 | ≥ 470 | |
| 80 < t ≤ 100 | ≥ 295 | — |
140 – 190 HBW
≥ 640 MPa
580 – 640 MPa
≥ 435 MPa
Additional Product Data for E355
Seamless process only (hot-finished, cold-drawn, or cold-rolled). Normalised (+N) is the standard delivery condition at 890–930 °C. Alternative conditions: as-rolled (+AR), cold-drawn/hard (+C), cold-drawn/soft (+LC), stress-relieved (+SR). FUSHUN METAL ensures full compliance through its ISO 9001 and AS9120B audited supply chain.
Mandatory: ladle analysis, room-temperature tensile test, flattening test, dimensional inspection, visual surface examination, NDT. EN 10204 Type 3.1 certification standard; Type 3.2 available on request. Optional: Charpy V-notch impact test, hardness test, eddy current testing per EN 10893-2, ultrasonic testing.
Excellent arc weldability with all common processes (MIG/MAG, TIG, MMA). Preheating to 100–150 °C recommended for wall thickness >20 mm or at ambient temperatures below 0 °C. Good cold formability suitable for bending, flaring, swaging, and expanding. Post-weld normalising recommended for critical service. CEV typically ≤ 0.45%.
Surface finishes: black (as-rolled), pickled & oiled, bright (cold-finished), honed (for cylinder applications). Corrosion protection: varnish coating, hot-dip galvanising, or epoxy paint on request. Standard packing: hexagonal bundled with steel straps, end caps for thin-walled tubes, weatherproof wrapping. Marking includes steel grade, heat number, dimensions, and manufacturer identification.