The strength grades of steel bars are expressed by grades: HPB235, HRB335, HRB400, etc. HPB 235: h stands for hot rolling, p stands for circle, and b stands for reinforcement. The yield point of this grade of 235 steel bar is not less than 235MPa, which is also called grade I steel. HRB335: H stands for hot rolling, R stands for ribbed steel bar, and B stands for steel bar. 335 The yield point of the steel bar of this brand is not less than 335 1, and the first rolling number indicates the strength grade of the steel bar: 3 indicates that the brand is HRB3354, representing the brand HRB400；; 5 represents the first group of letters of brand HRB500 rolling, indicating the manufacturing method: no letters-indicating ordinary hot-rolled steel bars; K stands for waste heat-treated steel bar; C stands for fine-grained hot-rolled steel bar; E stands for seismic reinforcement; W represents the middle group symbol of welded steel bar rolling, and indicates the manufacturer codes: Tangshan Iron and Steel (2T), Hangang Iron and Steel (HGHD), Angang Steel (AZ) and Shougang (S). The last set of figures is the nominal diameter of steel bar, in millimeters, and the diameter of steel bar is generally 6 ~ 50 millimeters.
Since the industrial revolution, steel production has been the simplest and roughest indicator of industrial capacity in various countries, and steel is also the second largest metal in the futures market after gold in market value and trading volume.
Since the financial crisis in 2008, the world's crude steel production and apparent steel consumption have increased by about 40%.
According to the data of World Iron and Steel Association, in 20 1808, the global crude steel output reached18.08 million tons, of which China accounted for more than half. The top 20 countries/regions with steel output and their output situation are as follows-these 20 steel-producing countries are also the most important manufacturing countries in the world today.
Looking at the figures, we can know that China's steel production and consumption account for about half of the world. According to statistics, in 20 18 years, China's steel products are mainly construction steel (rebar accounts for 18.9%, wire accounts for 12.4%) and plate (medium plate 6.4%, hot coil/kloc-).
There is no doubt that rebar is the most important kind of steel. At the same time, rebar futures listed on the Shanghai Stock Exchange are also one of the favorite varieties of investors and friends.