

303 Нержавеющий лист
303 stainless sheet is a free-machining austenitic stainless steel known for its high sulfur content, excellent machinability, и хорошая коррозионная стойкость. Its chemical composition makes it ideal for precision machining, CNC processing, and industrial mechanical components. По сравнению с 304 нержавеющая сталь, 303 provides easier machining but slightly lower corrosion resistance, making it a preferred material for shafts, крепежные детали, клапаны, and precision parts.
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- Описание
303 stainless sheet is a free-machining austenitic stainless steel material designed for applications requiring excellent machinability and good corrosion resistance. It is a modified version of 304 нержавеющая сталь, with added sulfur to improve cutting performance. Because of this, 303 stainless steel sheet is commonly used for precision machining parts, промышленные компоненты, and mechanical fabrication.
Что такое 303 Нержавеющий лист?
303 stainless sheet is an austenitic chromium-nickel stainless steel known for its outstanding machinability. The addition of sulfur improves chip breaking during machining, making it easier to cut, сверлить, mill, and turn compared with standard 304 нержавеющая сталь.
Хотя 303 has slightly lower corrosion resistance than 304, it offers better processing efficiency for parts that require extensive machining.
Химический состав 303 Нержавеющая сталь
The chemical composition of 303 stainless sheet provides a balance between corrosion resistance and machinability.
| Элемент | Содержание (%) |
|---|---|
| Углерод (С) | ≤ 0.15 |
| Хром (Кр) | 17.0 – 19.0 |
| Никель (В) | 8.0 – 10.0 |
| Марганец (Мин.) | ≤ 2.00 |
| Кремний (И) | ≤ 1.00 |
| Фосфор (П) | ≤ 0.20 |
| сера (С) | ≥ 0.15 |
| Железо (Фе) | Баланс |
The elevated sulfur content is the main feature that distinguishes 303 from other austenitic stainless steel grades.
Механические свойства 303 Нержавеющий лист
303 stainless steel provides good mechanical strength while maintaining excellent machinability.
| Свойство | Типичное значение |
|---|---|
| Предел прочности | ≥ 520 МПа |
| Предел текучести | ≥ 205 МПа |
| Удлинение | ≥ 35% |
| Твердость | ≤ 241 полупансион |
| Плотность | 7.93 г/см³ |
| Melting Range | 1400 – 1450°С |
It remains non-magnetic in annealed condition but may become slightly magnetic after cold working.
Основные характеристики производительности
Отличная обрабатываемость
303 stainless steel is widely recognized for its superior machinability among austenitic stainless steels. It performs well in:
- обработка с ЧПУ
- Поворот
- Бурение
- Milling
- Threading
- Точная резка
Its machinability can be significantly better than 304 due to sulfur inclusion.
Хорошая коррозионная стойкость
303 offers good corrosion resistance in mild atmospheric and industrial environments, though it is slightly lower than 304 because sulfur reduces pitting resistance.
Good Surface Finish
The material can achieve a smooth machined finish, making it suitable for visible precision components.
Non-Heat Treatable
Like most austenitic stainless steels, 303 cannot be hardened by heat treatment but can be strengthened by cold working.
Общие применения 303 Нержавеющий лист
303 stainless steel sheet is widely used for components that require machining and moderate corrosion resistance.
- Детали точной обработки
- Валы
- Крепежи
- Шестерни
- Гайки и болты
- Компоненты клапана
- Втулки
- Aerospace fittings
- Части инструмента
- Electrical connectors
It is especially suitable for parts manufactured by CNC processing.
303 против 304 Нержавеющая сталь
| Особенность | 303 Нержавеющий лист | 304 Нержавеющий лист |
|---|---|---|
| Структура | Аустенитный | Аустенитный |
| Содержание серы | Выше | Стандартный |
| Обрабатываемость | Отличный | Умеренный |
| Коррозионная стойкость | Хороший | Лучше |
| Свариваемость | Ниже | Лучше |
| Типичное использование | Machined parts | Общее изготовление |
303 is preferred for machining-intensive parts, пока 304 is better for welding and corrosion-critical applications.
Общие размеры листов
303 stainless sheet is commonly supplied in thin and medium gauge formats.
| Толщина | Ширина | Длина |
|---|---|---|
| 0.5 мм | 1000 мм | 2000 мм |
| 1.0 мм | 1219 мм | 2438 мм |
| 2.0 мм | 1500 мм | 3000 мм |
| 3.0 мм | 1500 мм | 6000 мм |
Custom laser cutting and machining services are commonly used for industrial projects.












