Project Description
E470 Seamless Steel Tube — Overview
E470 (1.0536) is a microalloyed quality steel seamless circular tube specified under EN 10297-1 for mechanical and general engineering purposes. Designation “E” identifies an engineering steel tube grade, and “470” denotes the minimum yield strength of 470 MPa in the as-rolled (+AR) delivery condition. E470 achieves its elevated strength through V-N precipitation strengthening combined with niobium grain refinement, without requiring the higher carbon content of heat-treatable grades. The standard delivery condition is as-rolled (+AR), with the option of cold-working plus normalising. FUSHUN METAL supplies EN 10297-1 E470 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. As the first microalloyed strength tier above the non-alloy EN 10297-1 grades (E235–E355), E470 is specified for heavy-duty hydraulic cylinders, automotive drivetrain components, and high-stress mechanical assemblies where 470 MPa minimum yield is required without resorting to quench-and-temper steels.
Equivalent Grades of E470
EN 10297-1 E470 (1.0536) is a V-N microalloyed seamless tube grade; exact equivalents are limited. The following are functional approximations based on yield class and application.
| Standard | Grade | Remarks |
|---|---|---|
| DIN | StE460 (DIN 17102), S460NL | Microalloyed fine-grain steels; DIN 17102 is the closest legacy designation |
| ASTM | A572 Gr.65 | Approximate yield equivalent; verify product form and delivery condition |
| JIS | SM570, STKM 17C | SM570 for welded structures; STKM 17C (JIS G 3445) for machine structural tubes |
| GOST | St60F | Russian structural steel at comparable yield level; chemistry differs |
| EN 10305-1 | E410 (1.0509) | Lower strength (410 MPa) EN 10305-1 precision tube grade with similar chemistry |
Typical Applications of E470 Seamless Tubes
High-pressure hydraulic cylinder barrels, telescopic cylinder stages, piston rods for mobile cranes, mining equipment cylinders, and injection moulding machine tie bar tubes. FUSHUN METAL supplies honed and SRB-finished E470 cylinder tubes.
Hollow transmission shafts, axle tubes, steering knuckles, wheel hub sleeves, propeller shaft housings, and suspension arm pivot tubes for heavy trucks and off-highway vehicles where 470 MPa minimum yield is specified.
Tractor hitch linkage tubes, baler rollers, plough frame sleeves, excavator boom pins, dozer hydraulic arms, and combine harvester driveline components subject to cyclic loading and impact.
Drill collar substitutes, rotary table drive sleeves, mud pump liners, downhole tool housings, and wellhead equipment tubulars in moderate sour service where higher mechanical strength than E355 is required.
Hollow shafting for gearboxes and reducers, wind turbine pitch system actuating tubes, conveyor idler rollers, rotary kiln support rollers, and large electric motor rotor sleeves. E470 provides torque capacity at reduced weight.
Railway axle box sleeves, bogie torsion tubes, drawbar housings, marine rudder stock bushings, propeller shaft liners, and hatch cover hydraulic cylinder tubing subject to corrosive marine atmospheres.
Supply Range of E470 Seamless Tubes
FUSHUN METAL supplies EN 10297-1 E470 seamless tubes across three manufacturing routes from ISO 9001 and AS9120B-certified production lines. Every batch undergoes incoming dimensional verification and optical emission spectroscopy prior to dispatch.
| OD Range | 26.9 – 610 mm |
| WT Range | 3.0 – 65 mm |
| Length | 4,000 – 14,000 mm |
| Condition | +AR / +N |
| OD Range | 10.0 – 180 mm |
| WT Range | 1.2 – 25 mm |
| Length | 4,000 – 12,000 mm |
| Condition | +C / +SR / +N |
| OD Range | 6.0 – 100 mm |
| WT Range | 0.6 – 12 mm |
| Length | 4,000 – 12,000 mm |
| Condition | +CR / +N |
Custom cut-to-length, bevel end, plain end, and protective chamfer available. FUSHUN METAL processes E470 with controlled piercing at 1200–1240 °C and inter-stage annealing at 720 °C for cold-worked products. Standard packing: hexagonal bundles with steel straps and weatherproof wrapping for sea freight.
Chemical Composition of E470
Ladle analysis limits per EN 10297-1 for E470 (1.0536). FUSHUN METAL verifies each heat via optical emission spectrometry as part of incoming quality control. The addition of V and Nb to the base C-Si-Mn composition enables precipitation strengthening and grain refinement, achieving 470 MPa minimum yield in the as-rolled condition.
| Element | C | Si | Mn | P | S | V | Nb | N | Al |
|---|---|---|---|---|---|---|---|---|---|
| Min % | 0.16 | 0.10 | 1.30 | — | — | 0.08 | — | — | 0.010 |
| Max % | 0.22 | 0.50 | 1.70 | 0.030 | 0.035 | 0.15 | 0.07 | 0.020 | — |
V (0.08–0.15%) combines with N to form fine V(C,N) precipitates that strengthen the ferrite-pearlite microstructure through precipitation hardening. Nb (≤0.07%) and Al (≥0.010%) refine the austenite grain size during hot rolling, reducing the ductile-to-brittle transition temperature. The base C-Mn-Si chemistry closely resembles that of the non-alloy E355 grade, with the V-Nb-N microalloying delivering the additional 115–120 MPa of strength.
Mechanical Properties of E470
Properties in the as-rolled (+AR) delivery condition per EN 10297-1 at room temperature. FUSHUN METAL issues EN 10204 Type 3.1 certified mill test reports for every shipment.
| Wall Thickness t (mm) | Yield Strength ReH (MPa) | Tensile Strength Rm (MPa) | Elongation A (%) |
|---|---|---|---|
| t ≤ 16 | ≥ 470 | ≥ 650 | ≥ 17 (longitudinal) ≥ 15 (transverse) |
| 16 < t ≤ 40 | ≥ 430 | ≥ 600 | ≥ 17 (longitudinal) ≥ 15 (transverse) |
170 – 230 HBW
620 – 780 MPa
≥ 450 MPa
880 – 920 °C
Additional Product Data for E470
Seamless process only (hot-finished, cold-drawn, or cold-rolled). As-rolled (+AR) is the standard delivery condition per EN 10297-1. Alternative: cold-worked plus normalised (+C+N) at 880–920 °C followed by controlled air cooling. FUSHUN METAL ensures full compliance with controlled piercing at 1200–1240 °C and inter-stage annealing at 720 °C for cold-worked products, all under ISO 9001 and AS9120B audited processes.
Mandatory: ladle analysis, room-temperature tensile test, flattening test, dimensional inspection, visual surface examination, non-destructive testing. 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 per EN 10893-10.
Good weldability with all common arc welding processes. Preheat to 150–200 °C recommended for wall thickness >15 mm or ambient temperature below 5 °C. Post-weld stress relief at 530–580 °C advised for thick sections and restrained joints. Cold formability is adequate for bending and flaring; hot forming at 850–1050 °C yields best results for severe deformation. The V-N microalloyed design maintains good toughness despite the higher strength level.
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. FUSHUN METAL can supply to specific OEM packing and labelling requirements.