Introduction
The DIN 6935 standard is a widely recognized specification in the steel industry, outlining the technical delivery conditions for hot rolled steel strip used in cold forming applications. This standard is essential for ensuring the quality and reliability of steel products used in various industries, including construction, automotive, and manufacturing.
Scope and Application
The DIN 6935 standard applies to hot rolled steel strips with a thickness range of 3 mm to 25 mm and a width range of 600 mm to 2,050 mm. These steel strips are used for cold forming applications, such as bending, folding, and profiling, to produce various shapes and structures. The standard covers the technical delivery conditions for these steel strips, including their chemical composition, mechanical properties, and surface quality.
Chemical Composition
The DIN 6935 standard specifies the chemical composition of the steel strips, including the maximum allowed percentages of carbon, manganese, silicon, and other elements. The standard also defines the acceptable limits for impurities, such as sulfur and phosphorus. The chemical composition of the steel strips is critical in determining their weldability, formability, and mechanical properties. Din 6935 Standard Pdf
Mechanical Properties
The standard outlines the mechanical properties of the steel strips, including their yield strength, tensile strength, and elongation. These properties are essential in determining the steel strips' ability to withstand various types of loading, such as bending, stretching, and impact. The standard also specifies the testing methods and conditions for determining these mechanical properties.
Surface Quality
The DIN 6935 standard defines the surface quality requirements for the steel strips, including the acceptable limits for surface defects, such as cracks, seams, and rust. The standard also specifies the testing methods for evaluating the surface quality of the steel strips.
Benefits and Importance
The DIN 6935 standard offers several benefits to manufacturers, designers, and users of steel products. By specifying the technical delivery conditions for hot rolled steel strips, the standard ensures that these products meet the required quality and reliability standards. This, in turn, enables the production of high-quality steel products with consistent properties, which is critical in ensuring the safety and performance of various structures and applications.
Conclusion
In conclusion, the DIN 6935 standard is a critical specification in the steel industry, outlining the technical delivery conditions for hot rolled steel strip used in cold forming applications. The standard covers the chemical composition, mechanical properties, and surface quality of these steel strips, ensuring that they meet the required quality and reliability standards. By adhering to this standard, manufacturers and users of steel products can ensure the production of high-quality products with consistent properties, which is essential in ensuring the safety and performance of various structures and applications.
Please note: DIN 6935 has been withdrawn and superseded by the international standard DIN EN ISO 13722. This report reflects the historical relevance, technical content, and the transition to the current standard.
Published by the Deutsches Institut für Normung (DIN), this standard specifies the permissible deviations in dimensions and form for bent workpieces made from flat rolled steel. Unlike general geometric tolerances (e.g., ISO 2768), DIN 6935 focuses exclusively on the unique behaviors of bending—such as springback, elongation, and thinning of material at the bend radius. Introduction The DIN 6935 standard is a widely
Conversely, the standard allows for the calculation of bend deduction, which is the amount subtracted from the total outside dimensions of the part to arrive at the flat size.
The standard provides a direct formula for calculating the length of the neutral axis in the bend zone:
[ A = \pi \cdot (r + v \cdot s) \cdot \frac\beta180 ]
Where:
Scenario: You need to bend a 3 mm thick S235 steel plate. r = 3 mm (so r/s = 1). Bending angle = 90°. Leg lengths = 50 mm and 50 mm (outside dimensions). What is DIN 6935
Step 1 - Find v: From the table (r/s=1), v = 0.36.
Step 2 - Calculate Bend Allowance (A):
( A = \pi \cdot (3 + 0.36 \cdot 3) \cdot \frac90180 )
( A = \pi \cdot (3 + 1.08) \cdot 0.5 )
( A = \pi \cdot 4.08 \cdot 0.5 \approx 6.41 \text mm )
Step 3 - Calculate Flat Length:
Calculate leg lengths from the neutral axis: You subtract one radius from each leg.
( L = (50 - 3) + (50 - 3) + 6.41 )
( L = 47 + 47 + 6.41 = 100.41 \text mm )
Without DIN 6935, a novice might simply add the outside lengths (50+50 = 100 mm), but the actual required blank is 100.41 mm. For a 90° bend, a 0.41 mm error is significant in precision engineering.