Heat treatment process generally includes heating, heat preservation, cooling three processes, sometimes only heating and cooling two processes.These processes are interconnected and uninterruptible.
Heating is one of the important steps of heat treatment.There are many heating methods for metal heat treatment, * early is the use of charcoal and coal as a source of heat, and then the application of liquid and gas fuel.The application of electricity makes heating easy to control and free from environmental pollution.These sources of heat can be heated directly or indirectly through molten salts or metals, or even floating particles.

Stainless steel pipe now more and more widely used, due to its good corrosion resistance has played a vital role in engineering construction, in the process of production we need a solid solution for stainless steel tube processing, the main purpose is to obtain certain martensite increase the hardness of products, let's look at the solution of the stainless steel tube processing:

According to the latest customs statistics, steel exports in the first half of 2011 were 24.33 million tons, an increase of 3.2% year-on-year; Imports were 8.03 million tons, down 4.8 percent year-on-year. As a whole, steel exports are still at a high level of more than 4 million tons, exceeding expectations. Restrained by the weak situation of international steel market, it is expected that the export situation of Chinese steel products in July and August is still not optimistic. The severe export situation will be changed in the fourth quarter. The export of the whole year is expected to reach about 45 million tons, which is helpful to alleviate the domestic steel market supply pressure.

In the first five months of this year, our cumulative exports of 2204 million tons of steel, year-on-year growth of 10.1%. Under the background of the deepening European debt crisis and the slowing economic growth of emerging market countries, the situation of Chinese steel exports in the first half of the year is better than the expectation of insiders at the beginning of the year. However, not all varieties of exports are very good, the author from the point of view of the varieties of interpretation of the difference.