In outdoor or applications with high aesthetic requirements, болты и гайки из нержавеющей стали are widely favored for their excellent weather resistance and visual appeal. Common types include 18-8, 304, and 316. What are the differences between them? Gaining a deeper understanding of the properties of these three materials will help you make more informed procurement decisions. This article aims to address this question for you.
18 8 VS 304 vs 316 Composition Comparison
18-8 stainless steel is a type of material named after its key chemical composition, primarily containing 18% chromium and 8% nickel. This category of materials is collectively referred to as 18-8 stainless steel, with typical grades including 302, 304, and 305.
304 stainless steel (AISI standard designation in the U.S.) also contains 18-20% chromium and 8-10.5% nickel, offering excellent corrosion resistance. Its derivative materials include low-carbon 304L, which improves weldability.
316 stainless steel contains 16-18% chromium, 10-14% nickel, and adds 2-3% molybdenum, with corrosion resistance (especially in chloride environments) superior to 304 stainless steel. Its low-carbon version, 316L (medical-grade stainless steel), effectively prevents intergranular corrosion by reducing carbon content.
18 8/304 vs 316 Characteristic Contrast
304 is the most widely used grade in 18-8 stainless steel, featuring good strength and toughness, excellent workability, and a bright, aesthetically pleasing surface. It resists atmospheric corrosion, water, steam, and various chemical media, with outstanding formability and weldability.
316 stainless steel is an upgraded version of 304 stainless steel, inheriting its workability and weldability while offering superior corrosion resistance compared to SUS304, especially in chloride-containing environments, particularly in harsh industrial, marine, or chemical settings.
Stainless steel 304 vs 316 price
The composition of 304 stainless steel is relatively simple, with controllable costs, and it can meet the corrosion resistance requirements for most daily scenarios. It is the most cost-effective food-grade stainless steel.
In contrast, 316 stainless steel is specifically alloyed with molybdenum to achieve higher corrosion resistance, and its manufacturing process is more complex, resulting in higher costs compared to 304 stainless steel.
18 8/304 vs 316 Stainless Steel Fastener Application
18-8 / 304 Stainless Steel Fasteners:
- Interior Decoration: Door and window hardware, stair handrails/guardrails.
- Outdoor Construction: Electrical equipment enclosures.
- General Industry: Workshop equipment, light industrial machinery, packaging machinery in non-strong acid/alkali environments.
- Food and Beverage Industry: Food processing equipment, catering utensil supports, dry food storage equipment in non-high salt/acidic medium environments.
- Freshwater Environment: Water treatment equipment, water heaters, and swimming pool peripheral facilities.
316 Stainless Steel Fasteners:
- Marine and Coastal Environments: Coastal buildings, ship and yacht equipment, dock facilities, offshore platforms, nearshore bridges, highway facilities exposed to de-icing salt environments (guardrails, signs).
- High Chloride Environments: Chemical equipment (involving media such as brine, halogens, bleach), desalination plant equipment, swimming pool equipment (direct contact with chlorinated water), and pharmaceutical equipment.
- Highly Corrosive Industrial Environments: Pulp and paper mills (containing sulfides, chlorides), chemical plant pipelines/reactor supports, flue gas desulfurization devices.
- Food and Beverage and Pharmaceutical Industries: Equipment in environments directly contacting high-salt, acidic foods, cleaners, or disinfectants, alcohol brewing equipment, and pharmaceutical production equipment.
- Medical Equipment: Surgical instruments, medical device structural components/frames, and implant fixation devices.
Краткое содержание
After an in-depth comparison of the characteristics and corrosion resistance of 18-8, 304, and 316 stainless steel materials, if you seek higher corrosion resistance, super austenitic stainless steels 904L and 254SMO, as well as duplex stainless steels 2205 and 2507, are undoubtedly superior choices.
As a professional supplier of stainless steel fasteners, T&Y can provide you with a one-stop solution, covering various high-end materials such as threaded rodsРезьбовой стержень, винты, орехи, шайбы, and other fastener products to meet your stringent requirements in different application scenarios. Contact us now!
Часто задаваемые вопросы
Stainless steel 304 vs 316, which is better?
There is no definitive answer as to whether 304 stainless steel or 316 stainless steel is better; the key lies in selecting the most suitable type based on your specific needs. In general environments, such as ordinary home construction and decoration, 304 stainless steel is the best choice due to its good corrosion resistance and cost-effectiveness. Conversely, in marine environments or other highly corrosive conditions, although 316 stainless steel is more expensive, its excellent corrosion resistance effectively prevents rapid corrosion damage, making it the ideal choice in such scenarios.
Stainless steel 304 or 316, which is magnetic?
Both SS304 and 316 stainless steels belong to the austenitic stainless steel series.
In the fully annealed state, their internal structure is stable austenite, thus exhibiting no magnetism. However, after cold working, partial transformation of austenite occurs, resulting in weak magnetism in the material. In comparison, under the same cold working conditions, 316 stainless steel generally exhibits lower magnetism than 304 stainless steel.
Stainless steel 304 vs 316, which has high strength？
The tensile strength of 304 stainless steel is approximately 515MPa, while that of 316 stainless steel is around 520MPa, slightly higher than that of 304.
How to tell if stainless steel is real?
The surface of high-quality stainless steel products is smooth and flawless, and the gloss is even under light, without grit, scratches, or rust. Real stainless steel has strong fingerprint resistance, and the fingerprint is easy to wipe clean after touching. You can also use special detection droplets on the surface to judge the authenticity of the material through color changes.
Russian 
English 
Spanish 
Arabic 
Portuguese