ASTM a588 is a high-strength low-alloy structural steel, divided into 4 grades:
A588GrA, A588GrB, A588GrC, A588GrK.Steel plates are used for welded, riveted, an
ASTM a588 is a high-strength low-alloy structural steel, divided into 4 grades:
A588GrA, A588GrB, A588GrC, A588GrK.
Steel plates are used for welded, riveted, and bolted structures, but are primarily used in welded bridges and buildings where weight savings or extended life are required.
This steel has significantly better atmospheric corrosion resistance than copper-containing or copper-free carbon structural steel in most environments, and when fully exposed to the atmosphere, this steel is suitable for many applications in the bare state, limited material The thickness is not more than 200mm.
Disadvantages of carbon steel:
(1) Low hardenability.
Under normal circumstances, the maximum hardening diameter of carbon steel water quenching is only 10mm-20mm.
(2) The strength and yield strength are relatively low.
For example, the σs of ordinary carbon steel Q235 steel is 235MPa, while the σs of low alloy structural steel 16Mn is more than 360MPa.
The σs/σb of 40 steel is only 0.43, which is much lower than that of alloy steel.
(3) The tempering stability is poor.
Due to the poor tempering stability, when carbon steel is quenched and tempered, a lower tempering temperature is required to ensure higher strength, so that the toughness of the steel is low; in order to ensure better toughness, a high tempering temperature is used. The strength is low at temperature, so the comprehensive mechanical properties of carbon steel are not high.
(4) Can not meet the requirements of special performance.
Carbon steel is often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, and cannot meet the needs of special performance.
