Hydraulic pipe EN 10305

carbon steelgalvanised steelsteel

Product Description
Product Name: EN 10305 Galvanized Hydraulic Seamless Steel Tube
Standard: EN10305-4 (DIN2445/2), EN10305-1 (DIN2391), ASTM A179
Steel grade: E235 (ST35 ST37.4), E355 (ST52 ST52.4)
Size: OD: 4-120mm
Wall Thickness (WT): 0.5-10mm
Length: fixed 6m or as your requirement
Finish: Galvanized — zinc coating of 8 to 12μm (electro-galvanized process described to form a uniform, dense galvanized layer; surface treatment described as >12μm in process details)
Delivery condition: +N (NBK) normalized under a controlled atmosphere
Delivery time: 15-45 days, according to the quantity and stock status
Shape: round
Process:

• Perforation
• Pickling
• Phosphating
• Cold drawn
• Cold rolling
• Annealing
• Anaerobic annealing (NBK)

Protection: Anti-rust oil on inner and outer surfaces; plastic covers at both ends.

Product Advantages

• Anti-rust — No corrosion after 120 hours' salt spray test
• Galvanized — Cold galvanized (electro-galvanizing) bright pipe
• Color — White, yellow and colorful options
• Bending — No zinc coating drop when bending
• Pressure sheet — Professional high pressure hydraulic tubing

Process & Quality Features (from product video block)
Cold drawn / cold rolled: High dimensional accuracy, excellent internal and external wall finish
Eddy current testing: Each steel pipe is tested by eddy current flaw detection to ensure product quality
Anaerobic bright heat treatment (NBK): During annealing, vacuum is applied and ammonia-decomposed nitrogen and hydrogen are injected for protection heating, heat preservation and cooling; maintains rolling accuracy and surface smoothness with improved mechanical properties and metallographic structure
Surface treatment (galvanized): Environmentally-friendly electro-galvanized technology to form a uniform, dense and well-combined galvanized layer providing high corrosion and rust resistance

Dimension
OD | Typical available thickness options (mm)
6 | 6*1; 6*1.5; 6*2
8 | 8*1; 8*1.5; 8*2
10 | 10*1; 10*1.5; 10*2
12 | 12*1; 12*1.5; 12*2; 12*2.5
14 | 14*1; 14*1.5; 14*2; 14*2.5; 14*3
15 | 15*1; 15*1.5; 15*2; 15*2.5; 15*3
16 | 16*1; 16*1.5; 16*2; 16*2.5; 16*3
18 | 18*1.5; 18*2; 18*2.5; 18*3; 18*3.5; 18*4
20 | 20*1.5; 20*2; 20*2.5; 20*3; 20*3.5; 20*4
22 | 22*1.5; 22*2; 22*2.5; 22*3; 22*3.5; 22*4
25 | 25*2; 25*2.5; 25*3; 25*3.5; 25*4
28 | 28*2; 28*2.5; 28*3; 28*3.5; 28*4
30 | 30*2; 30*2.5; 30*3; 30*3.5; 30*4; 30*4.5; 30*5
32 | 32*2; 32*2.5; 32*3; 32*3.5; 32*4; 32*4.5; 32*5
34 | 34*2; 34*2.5; 34*3; 34*3.5; 34*4; 34*4.5; 34*5; 34*6
35 | 35*2; 35*2.5; 35*3; 35*3.5; 35*4; 35*4.5; 35*5; 35*6
38 | 38*2; 38*2.5; 38*3; 38*3.5; 38*4; 38*4.5; 38*5; 38*6
40 | 40*2.5; 40*3; 40*3.5; 40*4; 40*4.5; 40*5; 40*6
42 | 42*2.5; 42*3; 42*3.5; 42*4; 42*4.5; 42*5; 42*6
45 | 45*2.5; 45*3; 45*3.5; 45*4; 45*4.5; 45*5; 45*6
46 | 46*2.5; 46*3; 46*3.5; 46*4; 46*4.5; 46*5; 46*6
48 | 48*2.5; 48*3; 48*3.5; 48*4; 48*4.5; 48*5; 48*6
50 | 50*2.5; 50*3; 50*3.5; 50*4; 50*4.5; 50*5; 50*6
54 | 54*3; 54*3.5; 54*4; 54*4.5; 54*5; 54*6
60 | 60*3; 60*3.5; 60*4; 60*4.5; 60*5; 60*6; 60*8

Chemical Composition (selected grades)
Steel grade | Number | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Total (min)
E215 | 1.0212 | 0.10 | 0.05 | 0.7 | 0.025 | 0.015 | 0.025
E235 | 1.0308 | 0.17 | 0.35 | 1.2 | 0.025 | 0.015 | —
E355 | 1.0580 | 0.22 | 0.55 | 1.6 | 0.025 | 0.015 | —

Tolerance (Outer Diameter and Wall Thickness)
Outer Diameter range | Allowable tolerance (GB/T3639) | DIN2391 special tolerance (OD / WT)
4mm-20mm | ±0.10mm | DIN2391 OD: ±0.08mm; WT: ±0.05mm
20mm-30mm | ±0.10mm | DIN2391 OD: ±0.08mm; WT: ±0.08mm
31mm-40mm | ±0.15mm | DIN2391 OD: ±0.15mm; WT: ±0.10mm
41mm-60mm | ±0.20mm | DIN2391 OD: ±0.20mm; WT: ±0.15mm
61mm-80mm | ±0.30mm | DIN2391 OD: ±0.30mm; WT: ±0.20mm
81mm-120mm | ±0.45mm | DIN2391 OD: ±0.45mm; WT: ±0.30mm

Mechanical Properties
Steel grade | Yield strength (min, MPa) | Tensile strength (MPa) | Elongation (%)
E215 (1.0212) | RH min. 215 MPa | Rm 290 to 430 MPa | A min. 30%
E235 (1.0308) | RH min. 235 MPa | Rm 340 to 480 MPa | A min. 25%
E355 (1.0580) | RH min. 355 MPa | Rm 490 to 630 MPa | A min. 22%

Caractéristiques / Spécifications techniques

• Standards: EN10305-4, EN10305-1, ASTM A179
• Series / model: EN 10305
• Steel grades available: E215, E235, E355
• Outer diameter range: 4 mm to 120 mm
• Wall thickness range: 0.5 mm to 10 mm (typical listed thicknesses vary by OD)
• Length: fixed 6 m or custom
• Surface finish: electro-galvanized (zinc coating typically 8–12 μm; process described as producing >12 μm layer)
• Delivery condition: +N (NBK) normalized, anaerobic bright heat treatment option
• Quality controls: eddy current flaw detection, dimensional controls, salt spray anti-rust performance
• Tolerances: OD and WT tolerances per GB/T3639 and DIN2391 (ranges listed above)
• Typical applications: high-pressure hydraulic tubing and related hydraulic piping systems (designed for bending, pressure, corrosion resistance)