Steel pipe DIN 2391

ASTM standardDINEuropean standard

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
Delivery condition: +N (NBK) normalized under a controlled atmosphere
Delivery time: 15-45 days, according to the 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 of the steel pipe
• Delicate: Phosphated coating is delicate, provides high lubricity and uniform color
• Exterior: Good-looking appearance
• Painting: Suitable for painting; strong paintability

Manufacturing / Quality Control
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 protection with ammonia-decomposed nitrogen and hydrogen is applied for heating, heat preservation and cooling to maintain rolling accuracy, surface smoothness and to ensure excellent mechanical properties and metallographic structure
Surface treatment (phosphated): High-quality phosphating on inner and outer walls forms a uniform, dense crystal structure with strong corrosion resistance and porosity; provides good coloring ability for painting and plastic spraying

Dimension
OD - Typical available wall 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
E215 (EN number 1.0212): C max 0.10; Si max 0.05; Mn max 0.7; P max 0.025; S max 0.015; Total min 0.025
E235 (EN number 1.0308): C max 0.17; Si max 0.35; Mn max 1.2; P max 0.025; S max 0.015; Total: —
E355 (EN number 1.0580): C max 0.22; Si max 0.55; Mn max 1.6; P max 0.025; S max 0.015; Total: —

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

Mechanical Properties
E215 (1.0212): Yield strength (min) 215 MPa; Tensile strength 290–430 MPa; Elongation A 30%
E235 (1.0308): Yield strength (min) 235 MPa; Tensile strength 340–480 MPa; Elongation A 25%
E355 (1.0580): Yield strength (min) 355 MPa; Tensile strength 490–630 MPa; Elongation A 22%

FAQ (selected)
1. Can I get some samples? Yes. Samples can be provided; the sample fee and shipping cost are normally paid in advance. After an order is placed, the sample fee is refundable as described by seller policy.
2. Can sample be produced? Yes, samples or technical drawings can be produced.
3. What are your payment terms? Payment ≤ $1000: 100% prepayment. Payment ≥ $1000: 30% T/T in advance, balance before shipment.
4. What are your delivery terms? EXW, FOB, CFR, CIF, DDU.

Caractéristiques / Spécifications techniques

• Product name: DIN 2391 phosphated precision seamless steel pipe
• Standards: EN10305-4, EN10305-1, ASTM A179
• Steel grades available: E215 (1.0212), E235 (1.0308), E355 (1.0580)
• Outer diameter range: 4–120 mm
• Wall thickness range: 0.5–10 mm (typical thickness options listed above by OD)
• Length: standard fixed 6 m or per request
• Surface treatment: Inner and outer phosphating coating
• Delivery condition: +N (NBK) normalized under a controlled atmosphere
• Typical delivery time: 15–45 days depending on quantity and stock
• Quality controls: Eddy current flaw detection; NBK anaerobic bright heat treatment applied during annealing
• Mechanical ranges: Yield strength 215–355 MPa (depending on grade); Tensile 290–630 MPa; Elongation 22–30% depending on grade
• Chemical composition limits provided per EN grade (see Chemical Composition section)
• Tolerances: OD and WT tolerances per ranges given in Tolerance section