What is DIN2391-ST35?

DIN 2391 ST35 is a seamless precision steel tube that complies with German Industrial Standard.

ST35 refers to the material grade of this steel tube.

1. DIN 2391. ST35 Characteristics

(1) DIN 2391. ST35 Material

ST35 is a non-alloy steel with good strength and toughness.

(2) Size range

Outer diameter: 4 mm - 60 mm

Wall thickness: 0.5 mm - 8 mm

(3) DIN 2391. ST35 Mechanical Properties

Tensile Strength: ≥ 340 MPa

Yield Strength: ≥ 235 MPa

Elongation: ≥ 25%

(4) DIN 2391. ST35 Chemical Composition

2. DIN 2391. ST35 Applications

DIN 2391 ST35 seamless steel tubes are widely used in the following fields:

lAutomotive Industry

Used for manufacturing high-precision automotive parts such as fuel pipes and hydraulic system pipelines.

lMechanical Manufacturing

Used for manufacturing precision mechanical parts such as bearings, shafts, and hydraulic cylinders.

lEngineering Structures

Used for various engineering structure supports and transmission components.

lOil and Gas Industry

Used for pipelines transporting high-pressure fluids and gases.

3. DIN 2391. ST35 Advantages

(1) High Precision

High dimensional accuracy, suitable for precision manufacturing.

(2) Good Mechanical Properties

Good strength and toughness, capable of withstanding high pressure and stress.

(3) Versatility

Suitable for various industrial fields with a wide range of applications.

4. DIN 2391 ST35 surface treatment types

lPickling

Pickling involves using an acid solution to remove oxide scales and rust from the steel tube surface. After treatment, the steel tube surface is smooth and clean, facilitating further coating or plating processes.

lPhosphating

Phosphating creates a water-insoluble phosphate coating on the steel tube surface, which improves corrosion resistance and provides a go od base for subsequent coatings.

lBlack Oxide

Black oxide treatment (also known as blackening or bluing) forms a black oxide film on the steel tube surface through a chemical reaction, enhancing its corrosion resistance and aesthetic appeal.

lElectroplating

Electroplating deposits a layer of metal (such as nickel, chromium, etc.) on the steel tube surface through an electrochemical process to enhance its corrosion resistance, wear resistance, and aesthetic appeal.

lGalvanizing

Galvanizing involves applying a zinc coating to the steel tube surface to provide excellent corrosion protection. Common galvanizing methods include:

-Hot-Dip Galvanizing

 Immersing the steel tube in molten zinc to form a thick and uniform zinc coating.

-Electro-Galvanizing

Depositing a layer of zinc on the steel tube surface through an electrochemical process.