Question: What is the material of sphc? Japanese brand, hot rolled commercial materials. Touch steel, p board, h-hot, c-mercial.
Question 3: What is the use of hot rolling forging casting? What material is used for hot rolling? After the raw materials are smelted, steel ingots are formed, and the heated steel ingots are rolled into steel by a press, which is even more hot rolling.
Forging: The popular name is "strike while the iron is hot". Cut the steel into short materials (blanking), reduce the hardness of the steel by heating, and then make the parts by die. Generally, there are processes such as blanking, heating, forming, trimming, punching and shaping.
Casting: It's a little different from the first two films. Generally, the steel is melted by heating, poured into the mold cavity, and taken out after the steel is solidified by water cooling to form parts. Commonly used casting methods are: pressure casting, sand casting, molten film casting and so on.
Question 4: Excuse me: What are the materials of cold-rolled and hot-rolled plates? Thank you. Cold rolling compensation includes SPCC-spcendc01-dc06st12-st16q195 and so on.
SPHC-SPHE Q235-Q490 is often used for hot rolling.
Not to mention the variety of steel, many people are confused and confused.
Question 5: the difference between cold-rolled and hot-rolled steel plates. Hot-rolled steel plates are rolled into relatively thin steel plates at higher temperatures. Cold rolling is rolling steel plates at room temperature. Generally, it is hot rolled first and then cold rolled. When the steel plate is thick, it can only be hot rolled, rolled into a thin plate and then cold rolled. Hot-rolled steel plates are divided into thick plates (thickness greater than 4mm) and thin plates (thickness 0.35~4mm). There is only one kind of cold-rolled steel plate (thickness 0.2 ~ 4 mm). The termination temperature of hot rolling is generally 800 ~ 900℃, and then it is generally cooled in air, so the hot rolling state is equivalent to normalizing treatment. Metal materials delivered in hot-rolled state have certain corrosion resistance, because their surfaces are covered with an oxide film, and the requirements for storage and transportation are not as strict as those for cold-drawn (rolled) materials. For example, large and medium-sized steel and medium-thick steel plates can be stored in the open air or covered. Compared with the hot-rolled state, the cold-rolled metal material has higher dimensional accuracy, better surface quality, lower surface roughness and higher mechanical properties. However, it is easy to be corroded or rusted, and its packaging, storage and transportation have strict requirements, so it needs to be stored in the warehouse, and attention should be paid to the temperature and humidity control in the warehouse. Due to the development and improvement of hot rolling technology, hot rolled plates have been widely used in occasions where precision requirements are not so strict. For example, hot-rolled galvanized sheet: hot-rolled galvanized sheet is directly galvanized with hot plate as substrate after pickling. Compared with the traditional galvanized sheet, it has obvious cost advantages because there is no cold rolling process, and has good development prospects in industries such as construction, automobile manufacturing, steel warehouse manufacturing, railway passenger car manufacturing, expressway guardrail plate and manufacturing. With the development of hot rolling technology, the quality of hot rolled products is continuously improved and the thickness is gradually reduced. The production of hot-rolled galvanized sheet from hot-rolled sheet replaces the traditional single-layer galvanizing, which not only broadens the application scope of hot-rolled galvanized sheet, but also occupies the market share of hot-dip galvanized sheet based on cold-rolled sheet. Internationally, hot-rolled galvanized sheet has been widely used.
Question 6: What material is channel steel?
Question 7: How to realize oracle's homework at 00: 00 a.m. every month 1 Sunday? Isn't there a planned task in oracle? Just set the execution time of the stored procedure.
Question 8: What is the material of hot-rolled channel steel? Most carbon steels are Q235.