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Quality Precision Seamless Tubes DIN2391 St52 factory
Quality Precision Seamless Tubes DIN2391 St52 factory
Quality Precision Seamless Tubes DIN2391 St52 factory
Quality Precision Seamless Tubes DIN2391 St52 factory
Quality Precision Seamless Tubes DIN2391 St52 factory
Quality Precision Seamless Tubes DIN2391 St52 factory

Precision Seamless Tubes DIN2391 St52

Basic Properties
Place of Origin: China
Brand Name: Pipeway
Certification: ISO 9001 ， TS16949
Model Number: DIN2391 Precision Seamless Steel Tube
Trading Properties
Minimum Order Quantity: 1 tons
Payment Terms: T/T
Supply Ability: 3000 tons per month
Tags

cold drawn seamless steel tube

thick wall steel tube

precision seamless steel pipe
Product Summary
DIN 2391 Precision Seamless Steel Tube ‌1. Basic Specifications‌ ‌Standard‌: DIN 2391 (German Industrial Standard for cold-drawn precision seamless steel tubes), superseded by ‌DIN EN 10305-1‌ in 2003 for certain applications‌ ‌Material‌: Carbon steel grades (e.g., ‌St30, St35, St45, St52‌) with ...

Product Details

Highlight:

DIN2391 Precision Seamless Tubes

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St52 Precision Seamless Tubes

,

Seamless Precision Tubes
Shape: Round
Surface: Galvanized, Black, Polished, Oiled
Technique: Cold Rolled, Cold Drawn
Tolerance: ±0.05mm
Ends: Plain
Package: Standard Export Package
Surface Treatment: Bright And Clean
Material: Steel
Product Description

DIN 2391 Precision Seamless Steel Tube 

‌1. Basic Specifications‌

  • ‌Standard‌: DIN 2391 (German Industrial Standard for cold-drawn precision seamless steel tubes), superseded by ‌DIN EN 10305-1‌ in 2003 for certain applications‌
  • ‌Material‌: Carbon steel grades (e.g., ‌St30, St35, St45, St52‌) with controlled carbon content (St52: C ≤ 0.22%, Mn ≥ 1.60%)‌36.
  • ‌Dimensions‌:
    • ‌Outer Diameter (OD)‌: 6–168 mm
    • ‌Wall Thickness (WT)‌: 1–20 mm
    • ‌Length‌: 5.8M, 6M, Maximal 11.8M

‌2. Manufacturing & Surface Treatment‌

  • ‌Cold Drawing‌: Precision cold-working enhances dimensional accuracy (±0.1 mm OD tolerance) and surface finish (Ra ≤ 0.4 μm)‌
  • ‌Heat Treatment‌: Annealing or normalizing to relieve internal stress and optimize mechanical properties‌
  • ‌Surface Finishes‌:
    • ‌Bright/Honed‌: Smooth internal surfaces (Ra ≤ 0.2 μm) for hydraulic systems to reduce friction and contamination‌
    • ‌Phosphating‌: Anti-corrosion treatment for harsh environments (e.g., marine, construction machinery)‌

‌3. Mechanical Properties‌

  • ‌St52 Grade‌:
    • Tensile strength ≥520 MPa, yield strength ≥360 MPa, elongation ≥18%‌36.
  • ‌Pressure Resistance‌: Designed to withstand ≥50 MPa operating pressure, ideal for hydraulic cylinders and high-pressure pipelines‌34.

‌4. Key Features‌

  • ‌High Precision‌: Tight tolerances ensure seamless integration in precision assemblies (e.g., automotive braking systems)‌
  • ‌Durability‌: Enhanced strength and ductility from cold-working processes‌
  • ‌Cleanliness‌: Oxide-free surfaces meet strict hygiene standards for hydraulic/pneumatic systems‌

‌5. Applications‌

  • ‌Hydraulic Systems‌: Cylinder tubes, high-pressure pipelines (certified for marine use)‌
  • ‌Automotive‌: Brake components, steering systems, and engine parts requiring dimensional stability‌
  • ‌Heavy Machinery‌: Structural components in excavators, loaders, and agricultural equipment‌

‌6. Compliance & Compatibility‌

  • ‌Standards‌: Aligns with ‌ISO/DIS 3304‌ and complementary to ‌ASTM A519‌ and ‌EN 10305-1‌‌
  • ‌Secondary Processing‌: Supports flaring, flattening, and machining without cracking‌

Material & Chemical Composition

Material Name St35 St45 St52
chemical analysis C: ≤0.17;Si: ≤0.35;Mn: ≥0.40;P: ≤0.025; S: ≤0.025; C: ≤0.21;Si: ≤0.35;Mn: ≥0.40;P: ≤0.025; S: ≤0.025 C:≤0.22;Si: ≤0.55;Mn: ≤1.60;P: ≤0.025; S: ≤0.025
Tensile Strength BK, ≥480MPa; BKW, ≥420MPa;BKS, ≥420MPa;GBK, ≥315MPa;NBK,340-470MPa BK, ≥580MPa; BKW, ≥520MPa;BKS, ≥520MPa,GBK, ≥390MPa, NBK 440-570MPa BK, ≥640MPa; BKW, ≥580MPa;BKS, ≥580MPa;GBK, ≥490MPa;NBK,490-630MPa
Yield strength BKS, ≥315MPa; NBK, ≥235MPa

BKS,≥ 375MPa;

NBK≥255MPa

 BKS, ≥420MPa; NBK, ≥355MPa
Standard DIN2391
Length 5-5.8M, 5.8M fixed length, or as customer's request
Packaging Bundles Package, wooden box
Heat Treatment/ Delivery Condition

1.Cold finished (hard) BK(+C)

Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation

2.Cold finished (soft) BKW(+LC)

The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding)

3.Cold finished and stress-relieved annealing BKS(+SR)

Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree.

4.Annealed GBK(+A)

The last Cold forming process is followed by annealing in a controlled atmosphere.

5.Normalized NBK(+N)

The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.
Delivery Time 45 days
Payment Term 30% TT in advance, Balance to be paid before shipment
Usage/Application Truck drag link, automotive parts
Surface free of oxide scale, bright

 

Keywords: DIN2391, Seamless steel tubes, Bright Annealing Tubes

Mr. Denny

Managing Director

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