Alloying Elements: DIN 17007 Designation

The DIN 17007 standard provides a unique system for designating steels, using a 5-digit (7-figure) numerical code. This system allows for precise identification of the characteristics of special steels, including the material type, alloying elements, production process, and applied treatments.

The code is made up of 5 numbers, each of which has a specific meaning:

First position (1 digit): Type of material
Indicate the general category of the material:

• • 0: Cast iron and iron alloys
  • 1: Steel
  • 2: Heavy metals (excluding iron)
  • 3: Light metals
  • 4: Non-metallic materials
  • 5: Non-metallic materials
  • 6: Non-metallic materials
  • 7: Non-metallic materials
  • 8: Non-metallic materials
  • 9: Reserved for internal use

Second Position (2 Digits): Alloying Elements
Defines the presence and quantity of the main alloying elements according to the table.

Third Position (2 Digits): Sequential Number
This allows for distinguishing steels within the same group that have similar characteristics.

Fourth Position (1 Digit): Production Process
This specifies the method used to produce the steel:

• • 0: Not determined or without particular importance
  • 1: Rimmed steel produced in a Thomas converter
  • 2: Killed steel produced in a Thomas converter
  • 3: Rimmed steel produced in another furnace
  • 4: Killed steel produced in another furnace
  • 5: Rimmed steel produced in a Siemens-Martin furnace
  • 6: Killed steel produced in a Siemens-Martin furnace
  • 7: Rimmed steel with oxygen blowing
  • 8: Killed steel with oxygen blowing

Fifth Position (1 Digit): Type of Treatment or Processing
This specifies any heat treatments or processing performed on the steel.

• Let’s break down the code 1.2344.92:

  • 1: Steel
  • 23: Steel group with Cr, Mo, V (Chromium, Molybdenum, Vanadium)
  • 44: Sequential number to distinguish similar steels
  • 9: Produced with an electric furnace
  • 2: Annealed

This system allows for a complete and detailed description of the properties and production processes of special steels.

The DIN 17007 steel designation system is an essential tool for precisely identifying and classifying materials. Thanks to this code, manufacturers and users can clearly communicate the technical specifications of steels, ensuring quality and traceability.

At Bonomi Acciai, as the Italian partner of Swiss Steel Group, we offer certified special steels that comply with the most rigorous regulations, guaranteeing quality, traceability, and reliability for applications in the most demanding industrial sectors.