The performance of weathering steel plate after high temperature hardening

If the weathering steel plate is quenched at a higher temperature, banded martensite can be obtained, or the number of banded martensite can be increased, so as to obtain good comprehensive properties.

The high temperature here is relative to the normal quenching heating temperature.

Weather resistant molten steel brazier

The experiment on the relationship between the carbon content of austenite and the morphology of martensite shows that the carbon content is less than 0. About 3% of the steel produced by quenching is lath martensite. However, the hardenability of ordinary weather-resistant steel plates for rust is very poor. In order to obtain martensite, in addition to alloying to improve the stability of supercooled austenite, it can only be achieved by increasing the austenitizing temperature and strengthening the quenching cooling method. For example, the use of 16mn steel to manufacture five birch plough arms, quenched at 940℃ in 10%nahh aqueous solution, and tempered at low temperatures can obtain good results.

The weathering steel plate can be quenched at high temperature to make the austenite composition uniform and obtain more lath martensite, thereby improving its overall performance. If compared in the quenched state, the fracture toughness of high-temperature quenching is almost twice that of ordinary quenching. Metal analysis shows that the appearance of layered martensite (twin martensite) is avoided by high temperature quenching, and band martensite is completely obtained.

Weathering steel tree grating

Weathering steel for rust is usually tempered at low temperatures. Although it has high strength, its toughness and plasticity are very low. In order to improve these properties, some special new methods have been adopted.

Fast short-term heating is used in weathering steel plate rust factory. Because the quenching heating temperature of the weathering steel plate is usually only slightly higher than the AC point, the dissolution of carbide and the homogenization of austenite can be achieved by extending the time. If rapid and short-term heating is used, the carbon content in austenite is low, so the toughness can be improved. For example, a t10a steel rock drill piston is preheated at 720 ° C for 16 minutes, quenched by short term force heat smin in a salt bath at 850 ° C, and tempered at 220 ° C for 72 minutes. Service life increased from the average lens at the beginning to om.