ST52.3 pipes and tubes are used where a combination of strength, dimensional accuracy and machinability is needed, particularly in hydraulic cylinders, machine parts and structural frames. Amardeep Steel supplies them in seamless and welded form. The grade is identified by material number 1.0570 and has a minimum yield strength of 355 MPa for wall thicknesses up to 16 mm. It should not be confused with the St52 used in our DIN 2391 ST52 pipes and tubes. For applications based on current European standards, buyers can also consider our EN 10305-1 E355 tubes. Other grades are available in our precision tubes. Mill test certificates and dimensional records accompany every order.
What Are ST52.3 Pipes and Tubes?
St 52-3 comes from the old German structural steel standard DIN 17100. In tube form it is supplied as seamless precision tube to DIN 2391 and as welded precision tube to DIN 2393, and it is the grade most widely used for hydraulic cylinder barrels. Both DIN tube standards have been replaced by EN 10305-1 and EN 10305-2, where the matching strength level is E355.
ST52.3 and St52: Not the Same Grade
St52 in DIN 2391 is material 1.0580. St 52-3 is material 1.0570, the impact tested quality of DIN 17100 that corresponds to S355J2 in EN 10025-2. The two reach the same strength, but St 52-3 carries a notch toughness requirement, which is why many cylinder and frame drawings call for it by name.
ST52.3 Pipes and Tubes Specifications
Parameter | Details |
|---|---|
Grade | ST52.3 (St 52-3) |
Material Number | 1.0570 |
Tube Standards | DIN 2391 (seamless precision), DIN 2393 (welded precision) |
Current EN Equivalent | EN 10305-1 and EN 10305-2 E355 |
Type | Seamless cold drawn and welded cold drawn |
Delivery Conditions | BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N) |
Cylinder Tube Finish | Cold drawn, honed, or skived and roller burnished |
Dimensions | As per DIN 2391-1 and DIN 2393-1, other sizes on request |
Length | Random lengths, fixed lengths and cut lengths |
Test Certificate | EN 10204 3.1, with 3.2 available on request |
ST52.3 Chemical Composition
Element | Content (%) |
|---|---|
Carbon (C) | 0.20 max |
Silicon (Si) | 0.55 max |
Manganese (Mn) | 1.60 max |
Phosphorus (P) | 0.035 max |
Sulfur (S) | 0.035 max |
The low carbon content and manganese strengthening keep ST52.3 easy to weld, which matters when cylinder tubes are welded to end caps and mounting lugs.
ST52.3 Mechanical Properties
Wall Thickness | Yield Strength, min | Tensile Strength | Elongation, min |
|---|---|---|---|
Up to 16 mm | 355 MPa | 490 to 630 MPa | 22% |
Over 16 mm up to 40 mm | 345 MPa | 490 to 630 MPa | 22% |
Choosing the Delivery Condition
Hard drawn (BK) tube gives the highest strength but little ductility. Stress relieved (BKS) tube keeps most of that strength and stays stable during machining, which makes it the common choice for honed cylinder barrels. Normalized (NBK) tube gives the values in the table above and suits parts that are bent or welded.
ST52.3 Equivalent Grades
Standard | Equivalent Designation |
|---|---|
DIN 17100 | St 52-3 (1.0570) |
EN 10025-2 | S355J2 (closest) |
EN 10305-1 / EN 10305-2 | E355 (tube strength level) |
SAE | 1518 (nearest) |
AFNOR | 20 M 5 (nearest) |
SIS | 2172 (nearest) |
Nearest grades are close matches, not direct substitutes. Check the drawing before switching standards.
ST52 vs ST52.3 vs E355
Property | ST52 (DIN 2391) | ST52.3 | E355 (EN 10305) |
|---|---|---|---|
Material Number | 1.0580 | 1.0570 | 1.0580 |
Yield Strength, min (NBK) | 355 MPa | 355 MPa | 355 MPa |
Tensile Strength (NBK) | 490 to 630 MPa | 490 to 630 MPa | 490 to 630 MPa |
Notch Toughness Requirement | Not specified | Yes (structural J2 quality) | Not specified |
Standard Status | Withdrawn | Withdrawn | Current |
If the drawing only asks for 355 MPa, EN 10305-1 E355 tubes or DIN 2391 ST52 tubes will usually do. Choose ST52.3 when the drawing names it or asks for impact tested material.
Applications of ST52.3 Pipes and Tubes
- Hydraulic and pneumatic cylinder barrels
- Telescopic cylinders and gas springs
- Automotive shock absorber tubes
- Hydraulic lines alongside our SAE J524 hydraulic tubing
- Construction machinery and machine frames
Testing and Documentation
Every order of ST52.3 pipes and tubes goes through the checks below at our testing facility or approved third party labs.
- Chemical analysis
- Tensile test for the ordered delivery condition
- Notch impact test where specified
- Flattening and flaring tests
- Eddy current or ultrasonic testing
- Close tolerance checks on OD, ID, wall and straightness
Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.
Packing and Marking
Each bundle is tagged with grade, size, delivery condition and heat number. Honed tubes are oiled and capped at both ends to protect the bore, and packed in wooden boxes for export. Read more about our packing and despatch process.
Request a Quote for ST52.3 Pipes & Tubes
Send us the OD, ID or wall thickness, delivery condition, bore finish, length and quantity, and our team will reply with price and delivery. Use the enquiry form or reach us through the contact page.
Frequently Asked Questions
What is ST52.3 material?
ST52.3, also written St 52-3, is a carbon manganese structural steel with material number 1.0570. In tube form it has a minimum yield strength of 355 MPa on walls up to 16 mm and a tensile strength of 490 to 630 MPa.
Is ST52.3 the same as S355J2?
S355J2 in EN 10025-2 is the closest current equivalent of St 52-3. For precision tubes the matching EN strength level is E355 in EN 10305-1 and EN 10305-2.
What is the difference between ST52 and ST52.3?
ST52 in DIN 2391 is material 1.0580 and ST52.3 is material 1.0570. Both reach 355 MPa yield, but ST52.3 comes from the impact tested structural quality, so it carries a notch toughness requirement.
Is ST52.3 tube used for hydraulic cylinders?
Yes. ST52.3 is one of the most widely used grades for hydraulic cylinder barrels, usually supplied stress relieved and then honed or skived and roller burnished.
