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1. DIN 603 product size standards: specify the content of basic product size; Products with threads also include the basic dimensions of threads, thread ending, shoulder distance, relief groove and chamfer, end dimensions of externally threaded parts, etc. 2. DIN 603 Standard for Technical Conditions of Products. Mainly includes product tolerance, mechanical properties, surface defects, surface treatment, product test standards and the corresponding specific provisions. 3. Standards for inspection, marking and packaging of screw products: specify the qualified quality level and sampling plan of spot check items when products leave the factory for acceptance, and the content of product marking methods and packaging requirements. 4. Standard Parts, DIN 603, Marking Method Standard for Screws and Screws: Specify the complete marking method and simplified marking method for products. 5. DIN 603 standards for other aspects: such as DIN 603 terminology standards, DIN 603 product weight standards, etc. Judging from the stress characteristics, the Round Head Bolt exerts pre-tension and transfers external force by friction. Common bolt connection transfers shear force by bolt shear resistance and hole wall bearing pressure. The pretension force generated when tightening nuts is very small, and its influence can be ignored. Besides its high material strength, high-strength bolts also exert a large pretension force on bolts, causing extrusion force between connecting members, thus causing a large friction force perpendicular to the screw direction. Moreover, pretension force, slip resistance coefficient and steel type all directly affect the bearing capacity of high-strength bolts. According to the stress characteristics, it can be divided into pressure-bearing type and friction type. The two calculation methods are different. The minimum specification of high-strength bolts is M12, and M16~M30 are commonly used. The performance of super-large bolts is unstable, so they should be carefully used in design.
Stainless steel is generally "stainless" in the atmosphere. The so-called stainless is a relative concept. Its corrosion resistance is conditional. Under certain conditions, stainless steel will also corrode. At present, there is no stainless steel with non-rust and corrosion resistance in any corrosive environment. Local corrosion is the most serious corrosion form of stainless steel DIN 603. This includes stress corrosion cracking, pitting, intergranular corrosion, crevice corrosion and fatigue corrosion. 1. Impact of Environmental Media Certain types of corrosion usually occur under some specific environmental conditions, pitting is easy to occur in media with special ions; Crevice corrosion may occur in the crevices where the solution stagnates or in the blocked surface, the joint of metal or metal and nonmetal, and the contact with rivets, bolts, gaskets, valve seats, loose surface deposits and marine organisms; The necessary conditions for the occurrence of stress corrosion cracking are tensile stress (whether residual stress, external stress, or both) and the presence of specific corrosion medium, etc. The environment affects the corrosion resistance of stainless steel round head bolts. Taking pitting corrosion as an example, the composition, concentration, pressure, temperature and PH value of environmental medium all affect the corrosion resistance of stainless steel round head bolts. Stainless steel is prone to pitting corrosion in media containing halogen anion CI-, Br-, I-. It is generally believed that pitting corrosion can only occur when halogen elements reach a certain concentration. The pitting potential of stainless steel round head bolts is related to the concentration of halogen elements, etc. Anions such as OH-, SO42- and the like in the medium can inhibit pitting corrosion of stainless steel round head bolts, and the effect decreases as follows: OH-＞NO3-＞AC-＞SO42-＞CIO4-。 At the same time, temperature, PH value and flow rate in the medium all affect pitting corrosion of stainless steel Round Head Bolt. As the temperature rises, the pitting potential of stainless steel round head bolts decreases and pitting is more likely to occur. When pH > 10, the pitting potential increases, but when pH is less than 10, the effect is very small. Generally, the flow rate of medium increases and the pitting tendency decreases. For stainless steel round head bolts, the flow rate favorable for reducing pitting is about 1m/s. If the flow rate is too large, erosion corrosion will occur.