StahlDat SX

According to classification in DIN EN 10020: 2000-07 contains the register of European steels

• over 550 unalloyed and alloyed quality steels
• over 450 stainless steels; heat-resistant and high-temperature resistant materials (RSH steels)
• over 150 unalloyed stainless steels
• over 1000 other alloyed stainless steels. In addition, these materials are linked with
• over 150 European producers of steel and semi-finished products with corresponding trade names
• over 350 international standards
• For 450 selected materials are also thermophysical properties (properties as a function of temperature) available, for example: Elasticity modulus, thermal expansion, thermal conductivity, el. Resistance.
• Pictures from the register of European steels
  
  

Materials

The database contains the main sheet steel materials for vehicle construction, which are linked to the corresponding tests:

• LC steels, IF steels
• deep drawing steels
• Bake-Hardening steels
• Micro-alloyed steels
• High strength steels
• DP steels
• TRIP steels
• austenitic steels
  
  

The steels were investigated both in the initial state and in defined pre-deformation and heat-treatment conditions.

TTT database

Data and literature for the heat treatment of steels Unlike the previous Stahldat, the new Stahldat SX contains a continuously growing number of TTT and TTA diagrams.

With the StahlDat SX TTT database, finding suitable data is particularly easy:

• Search for chart type and austenitizing conditions
• Search for names and chemical composition
• Similarity search with ranking
• Tabular comparisons of different diagrams
  
  

Flow curves

All flow curves are parametric models (Hensel-Spittel, IMF TU Freiberg) with the parameters temperature, degree of deformation and deformation rate. Within the scope of the validity of the models, any flow curves for steel can be generated and compared with each other. In addition, relationships with other steel data, e.g. chemical composition and thermophysical properties, with the extensive analytical capabilities of the StahlDat SX Professional. Flow curves characterize the forming behavior of steels. They serve as a basis for the calculation of forces and the workload during forming. For example, e.g. the result of a finite element simulation largely depends on the quality of the flow curves used. The flow curve is the representation of the yield stress as a function of the logarithmic main shape change at constant other parameters such as temperature and strain rate.

Flow curves are available for more than 150 steels for different microstructure states. The flow curve database is directly linked to the materials of the Register of European Steels.

Specific heat capacity

An adiabatic calorimeter was used to determine the heat content and thus the true specific heat capacity and the average specific heat capacity. The recent studies used a dynamic power-difference calorimeter.

Specific electrical resistance

A specially constructed experimental setup allows the measurement of the specific electrical resistance. On rod-shaped samples, the specific electrical resistance in a thermostatted bath at 20 ° C can be determined. To determine the temperature dependence, thin sample plates are used, in which antiparallel Sägeschnitte be introduced to increase the electrical resistance.

Thermal conductivity

Based on the law of Wiedemann-Franz-Lorenz, the thermal conductivity can be calculated, especially if one has derived the coefficients in the relationship of heat conductance and resistance measurements on samples of the steel to be examined with the same or similar composition.

Thermal conductivity

From the determined values ​​of thermal conductivity, true specific heat capacity and density, the numerical values ​​for the thermal diffusivity result. For the direct measurement, the laser flash method was used for some steels.