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Standard Specification for ASTM A959-2004 SS304
| Grade | 304 |
| UNS | S30400 |
| Standard | ASTM A959-2004 |
| Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels | |
| Classification | Austenitic stainless steel |
| Introductions | 304 stainless steel is a common material in stainless steel, with a density of 7.93 g/cm3, also known as 18/8 stainless steel in the industry. As a widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and other hot processing good, no heat treatment hardening phenomenon (use temperature -196℃ ~ 800℃). Corrosion resistance in the atmosphere, if it is an industrial atmosphere or heavily polluted areas, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. It has good processability and weldability. Plate heat exchangers, bellows, household goods (1, 2 types of tableware, cabinets, indoor pipelines, water heaters, boilers, bathtub), auto parts (windshield wipers, mufflers, molding products), medical equipment, building materials, chemicals, food industry, agriculture, ship parts, millet mobile phones, etc. 304 stainless steel is a nationally recognized food grade stainless steel. 304 stainless steel material rust phenomenon, there may be the following reasons: Chloride ion Chloride ions exist widely, such as salt/sweat/sea water/sea breeze/soil and so on. Stainless steel in the presence of chloride ions in the environment, corrosion quickly, even more than ordinary mild steel. Therefore, there are requirements for the use of stainless steel environment, and it is necessary to wipe frequently, remove dust, and keep clean and dry. (So you can give him a “improper use”.) There is an example in the United States: a company with an oak container containing a chloride ion solution, the container has been used for more than 100 years, the last century in the 1990s to replace, because the oak material is not modern enough, the use of stainless steel replacement 16 days after the container due to corrosion leakage. Solution treatment The alloying elements do not dissolve into the matrix, resulting in low alloy content and poor corrosion resistance of the matrix. Intergranular corrosion This material, which does not contain titanium and niobium, has a tendency to intergranular corrosion. The intergranular corrosion can be reduced by adding titanium and niobium and then stabilizing them. In the air or chemical corrosive medium can resist corrosion of a kind of high alloy steel, stainless steel is a beautiful surface and good corrosion resistance, do not have to go through plating and other surface treatment, and play the inherent surface properties of stainless steel, used in many aspects of steel, usually called stainless steel. Representative properties are 13 chromium steel, 18-8 chromium nickel steel and other high alloy steel. From the metallographic point of view, because stainless steel contains chromium and the surface of the formation of a very thin chromium film, this film is separated from the oxygen intrusion in the steel has a role in corrosion resistance. In order to maintain the corrosion resistance inherent in stainless steel, the steel must contain more than 12% chromium. For applications where welding is required. The lower carbon content minimizes the carbides precipitated in the heat-affected zone near the weld, which can lead to intergranular corrosion (welding erosion) in stainless steel in some environments. Surface phenomenon The surface marking phenomenon refers to the deep processing of 304 stainless steel or the grinding of processed products, and the linear installation or point-like concave spot marking defects occur on the surface of the product. Cause: There are foreign bodies on the surface and mold surface, and scars on the surface of the holder pad. Countermeasures: Remove foreign bodies, scars before processing, and can also remove orange peel by fully grinding. The orange peel phenomenon refers to the phenomenon that 304 stainless steel molding products have a shape like orange peel on the surface under grinding or other circumstances. Reasons: insufficient grinding, the larger the processing of orange peel more serious, raw materials coarse grain, heat treatment softening. Countermeasures: The deep-processed products are fully ground, the suitable heat treatment conditions are selected, and the grain size of the raw materials is controlled. |
| SS304 Chemical Element Content (%) | |||||||
| Constituent | C | Si | Mn | P | S | Cr | Ni |
| Min | – | – | – | – | – | 18 | 8 |
| Max | 0.08 | 1 | 2 | 0.045 | 0.03 | 20 | 11 |
| Approximate comparison table-Austenitic stainless steel | |||||||||||||||
| China | Taiwan, China | Japan | Korea | America | The International Standard Organization | Germany | France | European standard | Russia | United Kingdom | |||||
| GB | ISC | CNS | JIS | KS | ASTM | UNS | ISO | Numerical grade | DIN EN/DIN | W-Nr. | NF EN/NF | EN | Numerical grade | GOST | BS EN/BS |
| 06Cr19Ni9 | S30408 | 304 | SUS 304 | STS 304 | 304 | S30400 | X5CrNi 18-10 | 4301-304-00-I | X5CrNi 18-10 | 1.4301 | Z6CN 18-09 | X5CrNi 18-10 | 1.4301 | 08Х18Н10 | 304S15 |
