ПРОГРЕСС
304 против 316 Нержавеющая сталь: Ключевые отличия трубок, Плиты и стержни
304 и 316 are the two most popular grades of austenitic stainless steel. They look almost identical, but the addition of molybdenum in 316 makes a significant difference in corrosion resistance, especially in chloride and salt-water environments. This article explains the key differences between 304 и 316 stainless steel for tubes, plates and bars, and helps you decide which grade your project really needs.
304 против 316: Ключевые различия
| Элемент | 304 | 316 |
|---|---|---|
| Chromium (Кр) | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel (В) | 8.0 – 11.0% | 10.0 – 14.0% |
| Molybdenum (МО) | None | 2.0 – 3.0% |
| Предел прочности | >= 515 МПа | >= 515 МПа |
| Предел текучести | >= 205 МПа | >= 205 МПа |
| Chloride resistance | Хороший | Отличный |
| Относительная стоимость | Ниже | Выше (approx. 20-30%) |
| Типичные применения | Food equipment, кухонная утварь, архитектурный, general industry | Морской, химический, pharmaceutical, медицинский, offshore |
304 Нержавеющая сталь: Уровень общего назначения
304 is the most widely used stainless steel grade in the world. With 18% хром и 8% никель, it offers good corrosion resistance, excellent formability and weldability, and reliable mechanical properties with a tensile strength of at least 515 МПа. It performs well in atmospheric, food and mild chemical environments, which is why it dominates applications such as kitchen equipment, переработка пищевых продуктов, beverage tanks, architectural decoration and general piping. For most indoor and general outdoor applications, 304 is the most cost-effective choice.
316 Нержавеющая сталь: The Marine and Chemical Grade
316 adds 2-3% molybdenum to its chromium-nickel base, which dramatically improves resistance to pitting and crevice corrosion in chloride environments. It also maintains higher strength and creep resistance at elevated temperatures. Это делает 316 the standard choice for marine hardware, coastal structures, химическое технологическое оборудование, pharmaceutical machinery, medical implants and heat exchangers where 304 would eventually pit or rust.
Как выбрать между 304 и 316
- For indoor, еда, beverage or general industrial use, 304 is sufficient and more economical.
- For marine, прибрежный, offshore or chloride-exposed environments, always choose 316.
- For chemical, pharmaceutical and medical applications, 316 is the safer choice.
- For decorative and architectural purposes, both grades can be supplied with brushed or mirror finishes.
- 316л (низкоуглеродистый) is recommended when welding thick sections to avoid sensitization and intergranular corrosion.
Заключение
The choice between 304 и 316 comes down to the working environment: 304 covers most general applications at a lower cost, пока 316 provides superior corrosion resistance where chlorides, chemicals or salt water are present. QIDAMT supplies both 304 и 316 stainless steel tubes, тарелки, bars, strips and coils with mill test certificates, конкурентоспособные цены и оперативная доставка. Contact us for a quote today.
