DIN 2391 ST45 refers to a seamless precision steel tube that adheres to the German Industrial Standard. The "ST45" designation indicates the steel grade used in the production of these tubes. DIN 2391-ST45 tubes are commonly utilized in mechanical engineering, automotive components, hydraulic systems, and various construction applications due to their superior strength and formability.
1. Characteristics of DIN 2391-ST45
(1) DIN 2391-ST45 Material
ST45 is a medium-carbon steel with a carbon content ranging from approximately 0.21% to 0.28%. This composition grants the material enhanced strength and hardness, making it suitable for applications requiring higher mechanical properties.
(2) DIN 2391-ST45 Size Range
Outer Diameter: 4 mm~120 mm
Wall Thickness: 0.5 mm~10 mm
(3) DIN 2391-ST45 Mechanical Properties
Tensile Strength: 500~650 MPa
Yield Strength: ≥ 335 MPa
Elongation: ≥ 21%
(4) DIN 2391-ST45 Chemical Composition
Element |
Content (%) |
C |
0.21 ~ 0.28 |
Mn |
0.40 ~ 0.70 |
P |
≤ 0.025 |
S |
≤ 0.025 |
(5) DIN 2391-ST45 Thermal Properties
Property |
Value |
Unit |
Thermal Expansion Coefficient |
11.5 x 10^-6 |
/°C |
Thermal Conductivity |
48 |
W/m·K |
2. Applications of DIN 2391-ST45
uAutomotive Industry
Used in the production of high-strength components such as shafts, axles, and suspension systems.
uMechanical Manufacturing
Suitable for manufacturing precision parts like hydraulic cylinders, gears, and high-strength bolts.
uEngineering Structures
Employed in load-bearing structures, pressure vessels, and piping systems requiring high strength and durability.
uOil and Gas Industry
Utilized in high-pressure pipelines and components subjected to harsh environments.
3. Advantages of DIN 2391-ST45
(1) High Mechanical Strength
(2) Good Machinability
(3) Versatility in Applications
4. Surface Treatment Types for DIN 2391-ST45
uPickling
Removes surface impurities and oxides, leaving a clean surface ready for coating or plating.
uPhosphating
Provides a corrosion-resistant phosphate layer, suitable for subsequent painting or coating.
uBlack Oxide
Creates a protective oxide layer, enhancing corrosion resistance and improving appearance.
uElectroplating
Adds a layer of metal, such as nickel or chrome, for improved corrosion resistance and aesthetics.
uGalvanizing
Hot-Dip Galvanizing
Immerses the tube in molten zinc for a thick, durable coating ideal for harsh environments.
Electro-Galvanizing
Applies a thinner zinc coating through electrochemical means, offering a smooth finish.
5. International Standards Comparison for DIN 2391-ST45
ASTM A519 (American Standard): ASTM A519 is comparable to ST45, typically used for mechanical tubing in automotive and industrial applications.
EN 10305-1 (European Standard): EN 10305-1 covers similar cold-drawn seamless tubes, with E255 as an equivalent material in the EN standard.
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