Stahlrohr DIN 2391

nach ASTM-StandardDINeuropäische Norm

Product Description
Product name: DIN 2391 phosphating precision seamless steel pipe
Standard: EN10305-4 (DIN2445/2), EN10305-1 (DIN2391), ASTM A179
Steel grade: E235 (ST35 ST37.4), E355 (ST52 ST52.4)
Size: OD: 4-120mm; WT: 0.5-10mm
Length: fixed 6m or as your request
Surface Treatment: Phosphating – External phosphating coating (inner and outer wall phosphating noted elsewhere)
Delivery condition: +N (NBK) normalized under a controlled atmosphere
Delivery time: 15-45 days, according to quantity and stock availability

Product Advantages

• Anti-rust: High anti-corrosion and anti-rust performance
• Total phosphating: Phosphating applied to both inner and outer surfaces
• Delicate: Phosphated coating has high lubricity, uniform and delicate appearance
• Exterior: Good looking appearance
• Painting: Suitable for painting with strong coloration ability

Product Video / Process Highlights
Cold drawn / cold rolled: High dimensional accuracy, excellent internal and external wall finish
Eddy current testing: Each pipe is tested by eddy current flaw detection to ensure product quality
Anaerobic bright heat treatment (NBK): Vacuum annealing with protective gases (ammonia-decomposed nitrogen and hydrogen) to maintain rolling accuracy and improve mechanical/metallographic properties
Surface treatment (phosphated): High-quality phosphating produces a uniform dense crystal structure with strong corrosion resistance, porosity control and excellent coloring ability for painting or plastic spraying

Dimension
OD | Thickness (examples / available combinations):
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
Header: Steel grade | Number | C (max.) | Si (max.) | Mn (max.) | P (max.) | S (max.) | Total (min.)
E215 | 1.0212 | C 0.10 | Si 0.05 | Mn 0.7 | P 0.025 | S 0.015 | Total min. 0.025
E235 | 1.0308 | C 0.17 | Si 0.35 | Mn 1.2 | P 0.025 | S 0.015 | —
E355 | 1.0580 | C 0.22 | Si 0.55 | Mn 1.6 | P 0.025 | S 0.015 | —

Tolerance
Outer diameter range | Allowable tolerance (GB/T3639) | DIN2391 | Special tolerance (OD) | Special tolerance (WT)
4mm-20mm | ±0.10mm | DIN2391 ±0.08mm | Special OD ±0.05mm | Special WT ±0.05mm
20mm-30mm | ±0.10mm | DIN2391 ±0.08mm | Special OD ±0.08mm | Special WT ±0.08mm
31mm-40mm | ±0.15mm | DIN2391 ±0.15mm | Special OD ±0.10mm | Special WT ±0.08mm
41mm-60mm | ±0.20mm | DIN2391 ±0.20mm | Special OD ±0.15mm | Special WT ±0.15mm
61mm-80mm | ±0.30mm | DIN2391 ±0.30mm | Special OD ±0.20mm | Special WT ±0.20mm
81mm-120mm | ±0.45mm | DIN2391 ±0.45mm | Special OD ±0.30mm | Special WT ±0.30mm

Mechanical Properties
Header: Steel grade | Number | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%)
E215 | 1.0212 | Yield 215 MPa | Tensile 290–430 MPa | Elongation 30%
E235 | 1.0308 | Yield 235 MPa | Tensile 340–480 MPa | Elongation 25%
E355 | 1.0580 | Yield 355 MPa | Tensile 490–630 MPa | Elongation 22%

FAQ

• Can I get some samples? Answer: Samples can be provided; sample fee and shipping cost are required in advance and may be refunded after order placement.
• Can sample be produced? Answer: Yes, samples or technical drawings can be made.
• What are your payment terms? Answer: For payments ≤ $1000, 100% prepayment; for payments ≥ $1000, 30% T/T in advance, balance before shipment.
• What are your delivery terms? Answer: EXW, FOB, CFR, CIF, DDU.

Caractéristiques / spécifications techniques

• Nom du produit: DIN 2391 Phosphated Precision Seamless Steel Tube
• Normes: EN10305-4 (DIN2445/2), EN10305-1 (DIN2391), ASTM A179
• Grades d'acier: E215, E235, E355 (équivalents ST35, ST37.4, ST52)
• Diamètre extérieur (OD): 4–120 mm
• Epaisseur paroi (WT): 0.5–10 mm (exemples détaillés dans la table Dimension)
• Longueur: standard 6 m ou sur demande
• Traitement de surface: Phosphating interne et externe
• Condition de livraison: +N (NBK) – normalisé en atmosphère contrôlée
• Contrôles qualité: Eddy current testing pour détection de défauts
• Procédé thermique: Anaerobic bright heat treatment (NBK) pour propriétés mécaniques améliorées
• Applications typiques: hydraulique de véhicules lourds, machines de construction, machines agricoles