ST52.4 DIN 1630 Cold Drawn Seamless Precision Steel Tube for Hydraulic Systems
Product Details
Cold Drawn Precision Steel Tube
,ST52.4 DIN 1630 Seamless Steel Tube
,Small Precision Hydraulic Steel Tube
DIN 1630 St 52.4 Cold-Drawn Seamless Precision Tube for Hydraulic System
Material
DIN 1630 St 52.4 (ST52.4) is a high-performance non-alloy carbon steel used to produce seamless, cold-drawn precision tubes for demanding service such as hydraulic and pneumatic systems, pipework, vessels, and general mechanical engineering.
In many supply chains, St52 / St52.4 is cross-referenced to EN grades such as E355 (1.0580) for hydraulic precision tubes.
Specifications
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Product type: Cold-drawn seamless precision tube (small OD / tight tolerance) for hydraulic lines and components.
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Primary grade: DIN 1630 St 52.4
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Typical alternative spec (hydraulics): EN 10305-4 E355 (+N), seamless cold drawn tubes for hydraulic & pneumatic power systems.
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Delivery condition (EN 10305-4): +N (normalized in controlled atmosphere after final cold drawing).
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Surface roughness (EN 10305-4): Ra ≤ 4 μm (optionally Ra ≤ 2 μm for inner surface when specified).
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Standard lengths (EN 10305-4): 6 m +50/0 mm (standard) or 6 m +10/0 mm (exact), unless otherwise agreed.
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Corrosion protection: Tubes are delivered with temporary corrosion protection; enhanced protections such as phosphating or electro-galvanizing are widely used for hydraulic line durability.
Main Features
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Seamless structure to minimize risk points versus welded tubing in pressure service.
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Cold-drawn precision with defined tolerances and controlled surface quality, supporting leak-free fittings and stable flow.
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Hydraulic-ready quality controls (chemical, tensile, dimensional, and leak-tightness verification; optional NDT for longitudinal imperfections).
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High strength option (St 52.4 / E355) suitable for higher pressure and higher load hydraulic components.
Our Advantages
1) “Can you guarantee tight tolerances and smooth ID/OD for reliable sealing and assembly?”
Yes. For hydraulic projects we can supply to EN 10305-4, which is explicitly characterized by precisely defined tolerances and a specified maximum surface roughness; the standard requires Ra ≤ 4 μm (and allows an inner-surface upgrade to Ra ≤ 2 μm when specified).
2) “How do you control leak risk and defects (especially for high-pressure hydraulics)?”
We follow a “hydraulic-first” inspection plan: chemical analysis, tensile testing, dimensional inspection, and leak-tightness verification on each individual tube are part of EN 10305-4’s inspection framework, with optional NDT for longitudinal imperfections using eddy current / flux leakage / ultrasonic methods and leak-tightness verification per EN ISO 10893-1.
3) “What corrosion protection and surface treatment options are available for storage and harsh service?”
Tubes are delivered with temporary protection against corrosion per EN 10305-4, and we can offer common hydraulic line finishes such as phosphating (improves rust resistance and oil retention) or electro-galvanizing depending on your installation environment and OEM requirements.
Chemical Composition
| Standard | Grade | C (max, %) | Si (max, %) | Mn (%)* | P (max, %) | S (max, %) | Altot (min, %) |
|---|---|---|---|---|---|---|---|
| DIN 1630 | St 37.4 | 0.170 | 0.035 | ≥0.35 | 0.040 | 0.040 | — |
| DIN 1630 | St 44.4 | 0.200 | 0.035 | ≥0.40 | 0.040 | 0.040 | — |
| DIN 1630 | St 52.4 | 0.220 | 0.550 | ≤1.60 | 0.040 | 0.035 | — |
| EN 10305-4:2016 | E235 (1.0308) | 0.17 | 0.35 | 1.20 | 0.025 | 0.015 | 0.015 |
| EN 10305-4:2016 | E355 (1.0580) | 0.22 | 0.55 | 1.60 | 0.025 | 0.015 | 0.020 |
Mechanical Properties
| Standard | Grade | Yield Strength (min, MPa) | Tensile Strength (MPa) | Elongation A (min, %) |
|---|---|---|---|---|
| DIN 1630 | St 37.4 | 235 | 350–480 | 25 |
| DIN 1630 | St 44.4 | 275 | 420–550 | 21 |
| DIN 1630 | St 52.4 | 355 | 500–650 | 21 |
| EN 10305-4:2016 | E235 | 235 | 340–480 | 25 |
| EN 10305-4:2016 | E355 | 355 | 490–630 | 22 |
Execution Standards
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DIN: DIN 1630 (legacy high-performance seamless tubes; still referenced for older specs).
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EN: EN 10305-4 (seamless cold drawn tubes for hydraulic & pneumatic power systems; +N delivery condition).
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ASTM: ASTM A519/A519M (seamless carbon & alloy steel mechanical tubing, hot-finished or cold-finished).
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SAE: SAE J524 (cold drawn and annealed seamless low-carbon steel pressure tubing for hydraulic lines).
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GOST: GOST 9567-75 (precision steel tubes; scope includes high precision production).
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JIS: JIS G 3445 (carbon steel tubes for machine structure and machine parts).
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GB: GB/T 3639-2021 (seamless cold-drawn/cold-rolled precision tubes for mechanical structures, hydraulic equipment, auto parts).
Application Areas
Typical industries: hydraulic & pneumatic systems, mobile equipment, industrial machinery, automotive, general mechanical engineering.
Where it is used (examples):
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Hydraulic power units & pipelines: rigid hydraulic lines, manifolds connections, pressure lines.
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Hydraulic cylinders: cylinder tube lines, control lines, auxiliary piping.
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Automotive & mobility: steering systems, shock absorber-related fluid lines, machine-part tubing where precision OD/ID matters.
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Factory automation: pneumatic/hydraulic actuator lines requiring consistent surface and dimensional quality.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,
it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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