{"id":15626,"date":"2026-11-06T03:54:15","date_gmt":"2026-11-06T03:54:15","guid":{"rendered":"https:\/\/weldomachining.com\/?p=15626"},"modified":"2026-11-06T03:54:17","modified_gmt":"2026-11-06T03:54:17","slug":"st52-vs-e355","status":"publish","type":"post","link":"https:\/\/weldomachining.com\/fr\/st52-vs-e355\/","title":{"rendered":"ST52 vs E355 Hydraulic Cylinder Tubes"},"content":{"rendered":"

Lorsque l'on compare les ST52 vs E355<\/strong> for hydraulic cylinder tubes, check more than the grade designation: confirm the product standard, delivery condition, and machining requirements. For cylinder barrels, specify the bore tolerance, geometry, and surface finish separately.<\/p>\n\n\n\n

What Is the Difference Between ST52 and E355?<\/h2>\n\n\n\n
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E355 is a grade explicitly used in the EN 10305 precision steel tube standards; ST52 is commonly found in older drawings and market literature, and the designation alone is usually insufficient to define the complete material specification.<\/strong> Therefore, ST52 and E355 cannot be treated as directly interchangeable based on their names alone.<\/p>\n\n\n\n

Objet<\/th>ST52<\/th>E355<\/th><\/tr><\/thead>
Designation<\/td>Legacy or market designation<\/td>EN 10305 grade; material no. 1.0580<\/td><\/tr>
Sp\u00e9cifications<\/td>Confirm the standard, suffix, and condition<\/td>Specify the standard and condition<\/td><\/tr>
Substitution<\/td>Verify the full original specification<\/td>Compare against the original specification<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

For example, EN 10305-1 lists the following properties for E355 in the +N condition<\/strong>: a minimum yield strength of 355 MPa, tensile strength of 490\u2013630 MPa, and minimum elongation after fracture of 22%. These values apply to the specified standard and delivery condition; they cannot be applied to all E355 conditions or products supplied to other standards.<\/p>\n\n\n\n

Which Standard Should Be Used for Hydraulic Cylinder Tubes?<\/h2>\n\n\n\n

The standard should be selected according to tube type and application: EN 10305-1 covers seamless cold-drawn precision tubes, and EN 10305-2 covers welded cold-drawn precision tubes; EN 10305-4 and EN 10305-6 cover seamless and welded cold-drawn tubes, respectively, for hydraulic and pneumatic systems.<\/strong> Cylinder barrels and pressure lines have different applications, so the applicable standard should be confirmed for each before ordering.<\/p>\n\n\n\n

When ordering, specify whether the part is a cylinder barrel or pressure line, whether the tube is seamless or welded, and the standard and its edition. \u201cHydraulic tube, ST52\u201d or \u201cE355 tube\u201d alone does not fully define the product requirements.<\/p>\n\n\n\n

How Does the Delivery Condition Affect the Product?<\/h2>\n\n\n\n

The delivery condition describes the tube\u2019s final cold-working and heat-treatment process and is linked to the corresponding property requirements.<\/strong> Select the condition based on subsequent processing, part design, and the applicable standard; do not assume that different conditions for the same grade have identical properties.<\/p>\n\n\n\n

Designation<\/th>Signification<\/th><\/tr><\/thead>
+C<\/td>No heat treatment after final drawing<\/td><\/tr>
+LC<\/td>Light drawing after final heat treatment<\/td><\/tr>
+SR<\/td>Stress relieved after final drawing<\/td><\/tr>
+A<\/td>Soft annealed after final drawing<\/td><\/tr>
+N<\/td>Normalized after final drawing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

For example, if a drawing specifies E355 +N, the purchase specification should retain the \u201c+N\u201d designation. Do not specify only E355 and assume that the supplier will provide the +N condition. The definitions and property requirements for each condition should be checked against the specified edition of the standard.<\/p>\n\n\n\n

What Should Be Specified for the Cylinder Bore?<\/h2>\n\n\n\n

At a minimum, the cylinder bore specification should include the finished inside diameter and its tolerance, roundness, straightness, and internal surface requirements.<\/strong> Tolerance designations such as H8 and H9 describe dimensional tolerance grades; they do not replace requirements for surface roughness or form error.<\/p>\n\n\n\n

Depending on the design, the drawing or purchase specification should state:<\/p>\n\n\n\n