Hot mechanical rolling:

The final deformation is carried out in a certain temperature range, so that the material can only rely on the heat treatment can not get the specific properties of the rolling process.
Note 1: if heated to 580 degrees after rolling, the strength of the material may be reduced. If it is necessary to heat up to 580 degrees or above, should be carried out by the supplier.
Note 2: mechanical rolling delivery may include accelerated cooling, or accelerated cooling and tempering (including self tempering), but not including direct quenching or quenching and tempering.

Grade representation method:

The grade of steel is composed of three parts, which are the Chinese phonetic alphabet, the yield strength value and the quality grade symbol. For example: Q345D. Which:
Q - the yield strength of steel "Qu" the first letter of Chinese phonetic alphabet;
345 - yield strength value, unit MPa;
D - quality grade D.
When the requirements of the steel plate thickness direction performance, the above specified brand with the direction of the (Z) performance level symbols, such as: Q345DZ15

Grade and chemical composition:

When the grain element is added, the steel should contain at least one of Al, Nb, V, Ti. The refined grain elements should be added to the quality certificate.
When the total aluminum (Alt) content is indicated, the Alt shall not be litter than 0.020%
Various grades of Cr, Ni, Cu as the residual elements, The remaining content of not more than 0.30%, such as the guarantee, not for analysis; when you need to join, the content should be consistent with the provisions of the standard or the agreement of both sides of supply and demand.
In order to improve the performance of steel, the addition of RE element can be calculated by 0.02%-0.2% of the weight of molten steel.

Steelmaking Products