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DIN Series Precision
Steel Tube
  Main Specification
  Main Character
  Main Steel Grade
  Delivery Condition
  Technical Specification
    Tolerance Comparison of Normal Specification
    The Theoretical Weight Table for Product
    Mechanical Properties
    Chemical Composition Table
  Application Samples
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   Site:Home >> Products Showing >> DIN Series Precision Steel Tube >> Technical Specification

Technical Specification

Main Material and Mechanical Properties:
The steel grades of raw material used in our company are mainly St35、St37.4(10#)、St45 (20#)、St55(35#)、Ck45(45#)、St52(16Mn)、lCrl8Ni9Ti, etc. was produced by Shanghai Baosteel Group.


The steel tube produced by our company has excellent mechanical properties and performance in process. The steel tube is able to stand the high pressure, impact and particularly suitable for application of hydraulic machinery and automotive fabrication. The tube can be cold bent at any angle. No crack will be happened after flaring and flattening for the industry, which the bending and forming is required in process.

Attached Table “Chemical Composition and Mechanical Properties of Normal Steel Grade”. The steel tube supplied by our company is compliant to and/or superior to the data listed in Table.

Accuracy in Dimension
1、 The tolerance in dimension is referred to the attached table “Tolerance Comparison of Normal Specification”
2、 The length of steel tube on delivery: normally 6m (different requirement in length can be negotiated)

Pressure
Theoretical formula of pressure calculation
Among which:
  p=testing pressure kgf/cm2 or N/mm2
  S=nominal thickness of tube wall
  D=nominal outer diameter of tube
  R=allowable pressure kgf/cm2or N/mm2, 80% of min. yield point of relative steel grade

Weight
The weight of specified length will be calculated as per theoretical weight. The weight of non-specified length will be calculated as per actual weight.
The theoretical weight of steel tube will be calculated according to the formula: W=0.02466S(D-S)
Among which, W = weight/m of tube; S = nominal wall thickness of tube; D = nominal outer diameter of tube

Surface quality
The internal and external surfaces of tube must be clean and no oxidization, crack, fold, rolling fold, scar and laminar defect.
The steel tube will have the status of inner and outer surfaces same as the result from the used process and heat treatment, but the depth of defects (e.g. scratch mark, bulge and concavity) is not allowed to exceed 0.025mm (such requirement is stricter than DIN2391 standard).

Packing against corrosion and transportation of tube
The steel tube was painted with antirust oil, covered with caps at two ends, packed with plastic film and linen or wooden case.
Note: Certificate of Quality Assurance of tube will be presented.



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