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Precision Seamless Tubes DIN2391 St52

    Buy cheap Precision Seamless Tubes DIN2391 St52 from wholesalers
     
    Buy cheap Precision Seamless Tubes DIN2391 St52 from wholesalers
    • Buy cheap Precision Seamless Tubes DIN2391 St52 from wholesalers
    • Buy cheap Precision Seamless Tubes DIN2391 St52 from wholesalers
    • Buy cheap Precision Seamless Tubes DIN2391 St52 from wholesalers

    Precision Seamless Tubes DIN2391 St52

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    Brand Name : Pipeway
    Model Number : DIN2391 Precision Seamless Steel Tube
    Certification : ISO 9001 , TS16949
    Delivery Time : 30 days
    Payment Terms : T/T
    Supply Ability : 3000 tons per month
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    Precision Seamless Tubes DIN2391 St52

    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    • Standard: DIN 2391 (German Industrial Standard for cold-drawn precision seamless steel tubes), superseded by DIN EN 10305-1 in 2003 for certain applications‌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 NameSt35St45St52
    chemical analysisC: ≤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: ≤0.025C:≤0.22;Si: ≤0.55;Mn: ≤1.60;P: ≤0.025; S: ≤0.025
    Tensile StrengthBK, ≥480MPa; BKW, ≥420MPa;BKS, ≥420MPa;GBK, ≥315MPa;NBK,340-470MPaBK, ≥580MPa; BKW, ≥520MPa;BKS, ≥520MPa,GBK, ≥390MPa, NBK 440-570MPaBK, ≥640MPa; BKW, ≥580MPa;BKS, ≥580MPa;GBK, ≥490MPa;NBK,490-630MPa
    Yield strengthBKS, ≥315MPa; NBK, ≥235MPa

    BKS,≥ 375MPa;

    NBK≥255MPa

    BKS, ≥420MPa; NBK, ≥355MPa
    StandardDIN2391
    Length5-5.8M, 5.8M fixed length, or as customer's request
    PackagingBundles 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 Time45 days
    Payment Term30% TT in advance, Balance to be paid before shipment
    Usage/ApplicationTruck drag link, automotive parts
    Surfacefree of oxide scale, bright

    Keywords: DIN2391, Seamless steel tubes, Bright Annealing Tubes

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