What is DIN 2391-ST45?

 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  

(5) DIN 2391-ST45 Thermal Properties  

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.