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Precision Seamless Tubes DIN2391 St52

Categories	Precision Seamless Steel Tube
Brand Name:	Pipeway
Model Number:	DIN2391 Precision Seamless Steel Tube
Place of Origin:	China
Certification:	ISO 9001 ， TS16949
MOQ:	1 tons
Packaging Details:	Bundles Packages
Delivery Time:	30 days
Payment Terms:	T/T
Supply Ability:	3000 tons per month
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

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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‌Standard‌: DIN 2391 (German Industrial Standard for cold-drawn precision seamless steel tubes), superseded by ‌DIN EN 10305-1‌ in 2003 for certain applications‌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 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

Product Tags:

DIN2391 Precision Seamless Tubes

St52 Precision Seamless Tubes

Seamless Precision Tubes

Precision Seamless Tubes DIN2391 St52

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