Зэвэрдэггүй ган, аустенит төрөл
303 Stainless Steel (S30300) Bar
A chromium-nickel austenitic stainless steel free machining bar.
Stainless steel type 1.4305 is popularly known as grade 303 stainless steel.
Grade 303 is the most readily machineable of all the austenitic grades of stainless steel.
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган specifically engineered for improved machinability while maintaining good corrosion resistance. It is widely used in нарийвчлалтай боловсруулсан эд ангиуд where ease of machining is critical.
The machineable nature of grade 303 is due to the presence of sulphur in the steel composition. Whilst the sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of type 303 is lower than that for 304. The toughness is still excellent as with other austenitic grades.
Property data given in this document is typical for bar products covered by EN Standards. ASTM, or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.
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Хүрээ
| Бүтээгдэхүүний хэлбэр | Империал хэмжээсүүд | Метрийн хэмжээсүүд |
| Дугуй саваа гэрэлтүүлсэн татлага H9 | 1/8 инч - 1 инч" | 2.0mm - 25.0mm |
| Round Bar Smooth Turned H9⁄10 | 1" - 3" | 25.0mm - 60.0mm |
| Round Bar Peeled K12/K16 | 3 1⁄4" - 8" | |
| Зургаан өнцөгт саваа | 0.250" - 2.750" | 7.0mm - 50.0mm |
Анхаарна уу
Хэрэв та хайж буй зүйлээ олж харахгүй бол, өөрийнхөө ...-тэй холбоо барина уу. Орон нутгийн үйлчилгээний төв Таны тодорхой шаардлагуудтай.
303 Stainless Steel Related Specifications
| Систем / Стандарт | Улс / Бүс нутаг | Ангилал / Албан тушаал |
| AISI | АНУ | 303 |
| АНУ-ын Нэгдсэн Улсууд | Олон улсын | S30300 |
| EN / W.Nr. | Европ | 1.4305 |
| Нэр (англи хэл дээр) | Европ | X8CrNiS18-9 |
| ASTM A276 | АНУ | 303 (bars, shapes) |
| ASTM A582 | АНУ | 303 (free-machining bars) |
| JIS | Япон | SUS303 |
| GB (ерөнхий хэрэглээ) | Хятад | 12Cr18Ni9 (free-machining type) |
Хувийн шинж чанарууд
Химийн найрлага
1.4305 Steel
EN 10088-3
| Химийн элемент | % Одоо |
| Нүүрстөрөгч (C) | 0.00 - 0.10 |
| Хромын (Cr) | 17.00 - 19.00 |
| Манган (Mn) | 0.00 - 2.00 |
| Кремний (Si) | 0.00 - 1.00 |
| Фосфор (P) | 0.00 - 0.05 |
| Үлэмж (S) | 0.15 - 0.35 |
| Никель (Ni) | 8.00 - 10.00 |
| Зэс (Cu) | 0.00 - 1.00 |
| Азот (N) | 0.00 - 0.11 |
| Төмөр (Fe) | Тэнцвэр |
Механик шинж чанарууд
Шугаман: 160 мм хүртэл диаметр/зузаан
EN 10088-3
| Механик шинж чанар | Үнэ цэнэ |
| Баталгаажуулах стресс | 190 минут МПа |
| Суналтын бат бэх | 500 to 750 MPa |
| Уртлалт A50 мм | 35 мин % |
| Бринеллийн хатуулаг | 230 Max HB |
Ерөнхий физик шинж чанарууд
| Физик шинж чанар | Үнэ цэнэ |
| Шигшүүр | 8.03 g/cm³ |
| Хайлах цэг | 1455 °C |
| Дулааны өргөлт | 17.3 x 10-6/K |
| Уян хатуугийн модуль | 193 ГПа |
| Дулааны дамжуулалт | 16.3 Вт/м·К |
| Цахилгаан эсэргүүцэл | 0.72 x 10⁻⁶ Ω·м |
Applications of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган тусгайлан зориулагдсан improved machinability while retaining good corrosion resistance. It is ideal for precision machined components in industrial and engineering applications.
1. Mechanical and Engineering Components
Gears, shafts, and bolts
Nuts, screws, and fasteners
Bearings and bushings
2. Automotive and Aerospace Applications
Engine and transmission components
Fuel and hydraulic system parts
Precision fittings and connectors
3. Industrial Machinery
Pump and valve components
Instrumentation and control equipment
Threaded parts and precision assemblies
4. Food, Beverage, and Pharmaceutical Industry
Equipment requiring боловсруулах боломж болон зэврэлтэнд тэсвэрлэх чадвар
Fittings, shafts, and small mechanical parts in processing equipment
Товч агуулга
303 stainless steel is widely used for applications requiring high machinability, good corrosion resistance, and mechanical strength. Its design makes it particularly suitable for precision machined parts дотор mechanical, automotive, aerospace, industrial, and food processing applications.
Characteristics of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган developed for enhanced machinability while maintaining good corrosion resistance and mechanical properties. It is particularly suitable for precision components requiring extensive machining.
1. Химийн найрлага
Агуулна chromium (17–19%) мөн nickel (8–10%).
Includes sulfur or selenium additives to improve machinability.
Low carbon content reduces risk of carbide precipitation during machining.
2. Хортон үйлдэлд тэсвэрлэх чадвар
Сайн тэсвэрлэх чадвартай oxidation, mild acids, and atmospheric corrosion.
Slightly lower corrosion resistance than 304 stainless steel due to sulfur content.
Сайн ажилладаг indoor, dry, or mildly corrosive environments.
3. Механик шинж чанарууд
Дунд зэрэг Суналтын бат бэх ба хатуулаг.
Гайхалтай Суналт ба бат бэх чанар for forming and machining.
Maintains stable properties across a wide range of temperatures.
4. Machinability
Exceptional machinability compared to standard austenitic stainless steels.
Easily machined with өндөр хурдны ган (HSS) эсвэл карбид багаж.
Үйлдвэрлэнэ continuous chips and smooth surfaces, reducing tool wear.
5. Formability and Fabrication
Болж болно cold worked, drawn, and formed, though work hardens slightly.
Welding is possible but may reduce corrosion resistance in the heat-affected zone.
6. Хэрэглээ
Gears, shafts, screws, and fasteners
Automotive and aerospace components
Pump and valve parts
Precision machinery and instrumentation
Товч агуулга
303 stainless steel is characterized by excellent machinability, good corrosion resistance, and moderate strength. Its unique properties make it ideal for precision-machined components in mechanical, automotive, aerospace, and industrial applications.
Нэмэлт мэдээлэл
Бэлтгэл
Fabrication of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган optimized for machinability, making it widely used in precision components and industrial applications. While it offers good corrosion resistance, special considerations are needed during fabrication due to its sulfur content, which can affect weldability.
1. Бүтээх
Cold working: 303 can be formed using standard techniques such as bending, stamping, and drawing.
Hot working: Limited due to the risk of grain growth and reduced corrosion resistance; care must be taken to control temperature and cooling rates.
2. Машин боловсруулалт
303 is highly machinable, with continuous chips and smooth finishes.
Төгс тохирно Эргүүлэх, фасон зүсэх, өрөмдөх, утас гаргах with high-speed steel (HSS) or carbide tools.
Lubrication and proper tool geometry improve surface finish and reduce tool wear.
3. Ганхалга
Welding of 303 is possible but not recommended for critical corrosion-resistance applications.
Sulfur content may lead to hot cracking or reduced corrosion resistance Халуун нөлөөлөлд өртсөн бүсэд.
Post-weld stress relief and corrosion-resistant coatings may be required.
4. Joining and Assembly
Тохиромжтой mechanical fastening, bolting, and riveting.
Adhesive bonding is possible in non-critical corrosion environments.
5. Гадаргууг дуусгах
Болж болно polished, passivated, or electroplated Зэврэлтэнд тэсвэрлэх чадварыг сайжруулах.
Surface treatments improve appearance and long-term durability in indoor or mildly corrosive environments.
Товч агуулга
303 stainless steel offers excellent machinability and good formability. While welding requires caution due to sulfur content, it can be cold worked, machined, and surface-finished effectively for precision components in mechanical, automotive, and industrial applications.
Гандах чадвар
Weldability of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган engineered for high machinability. Its weldability, however, is limited due to the sulfur or selenium content, which can lead to cracking and reduced corrosion resistance in welded areas.
1. General Welding Characteristics
Weldable using common methods: TIG (GTAW), MIG (GMAW), and resistance welding are possible.
High sulfur content can cause hot cracking and poor weld bead quality.
Not recommended for critical corrosion-resistance applications without precautions.
2. Welding Techniques
TIG (GTAW) welding: Provides controlled heat input, minimizing the risk of cracking.
MIG (GMAW) welding: Possible with proper filler material and welding parameters.
Spot and resistance welding: Suitable for thin sections and non-critical parts.
3. Filler Materials
Ашиглах 304 or 308 stainless steel filler rods/wires to maintain corrosion resistance.
Avoid fillers that are incompatible with high-sulfur 303 steel.
4. Preheating and Post-Weld Treatments
Урьдчилан халаах ерөнхийдөө шаардлагагүй, but stress relief may help reduce cracking in thicker sections.
Post-weld passivation or surface treatment improves corrosion resistance in the weld zone.
5. Практик анхаарах зүйлс
Welding should be performed by experienced operators due to the risk of cracking.
Machined 303 components are often assembled mechanically or by adhesive bonding instead of welding.
For welded assemblies requiring corrosion resistance, consider using 304 or 304L stainless steel харин.
Товч агуулга
303 stainless steel has хязгаарлагдмал гагнагдах чадвар because of its sulfur content. While welding is possible using TIG, MIG, or resistance methods, precautions such as appropriate filler materials, controlled heat input, and post-weld treatments are necessary. For critical corrosion-resistant applications, alternative grades like 304 or 304L are preferred.
Машинлах боломжтой байдал
Machinability of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган specially designed for enhanced machinability. Its composition, which includes sulfur or selenium additives, allows it to be machined easily and efficiently compared to standard 304 stainless steel.
1. Машин боловсруулалтын онцлог шинжүүд
Үйлдвэрлэнэ short, easily controlled chips, reducing the risk of tool clogging.
Шаарддаг lower cutting forces than standard austenitic stainless steels.
Machinable using өндөр хурдны ган (HSS) эсвэл карбид багаж.
2. Тоног төхөөрөмжийн зөвлөмжүүд
Хэрэгслийн материал: High-speed steel (HSS), carbide, or cobalt tools.
Cutting speeds: Higher than 304 stainless steel; reduces tool wear.
Lubrication: Use cutting fluids to improve surface finish and reduce heat.
3. Машин боловсруулалтын ажиллагаа
Turning: Excellent surface finish and dimensional accuracy.
Milling and Drilling: Smooth operation with minimal work hardening.
Tapping and Threading: Produces clean threads without galling.
4. Давуу талууд
Бууруулна tool wear and machining time.
Хамгийн бага болгох Ажлын хатуужил, making post-machining operations easier.
Үйлдвэрлэнэ consistent surface finishes Нарийвчлалтай эд ангиудад тохиромжтой.
5. Applications Benefiting from Machinability
Gears, shafts, screws, and fasteners
Automotive and aerospace precision parts
Pump, valve, and instrumentation components
Товч агуулга
303 stainless steel is characterized by exceptional machinability, ингэснээр үүнийг ...-д төгс болгодог precision-machined parts in mechanical, automotive, aerospace, and industrial applications. Its composition allows for efficient machining with reduced tool wear and excellent surface finish, while maintaining сайн зэврэлт тэсвэрлэлт in non-critical environments.
Зэврэлт тэсвэр
Corrosion Resistance of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган optimized for machinability, while retaining сайн зэврэлт тэсвэрлэлт in many environments. However, its corrosion resistance is slightly lower than standard 304 stainless steel due to the addition of sulfur or selenium.
1. Ерөнхий зэврэлт тэсвэрлэх чадвар
Тэсвэрлэнэ oxidation and atmospheric corrosion under normal conditions.
Сайн ажилладаг indoor, dry, or mildly corrosive environments.
Ашиглахыг зөвлөдөггүй highly corrosive, chloride-rich, or marine environments.
2. Corrosion in Chemicals
Сайн тэсвэрлэх чадвартай organic acids, mild alkalis, and non-oxidizing solutions.
Sulfur content may reduce performance in strong acids, oxidizing environments, or seawater.
3. Stress and Crevice Corrosion
Generally resistant to ерөнхий зэврэлт, but prone to pitting or crevice corrosion in chloride-rich solutions.
Avoid use in applications requiring maximum corrosion resistance Хамгаалалтын бүрхүүлгүй.
4. Surface Protection
Болж болно passivated to restore a clean, corrosion-resistant surface.
Polishing and surface treatments improve long-term corrosion resistance.
5. Practical Applications
Indoor mechanical components and precision parts
Instrumentation and fasteners exposed to mild environments
Automotive and aerospace parts not exposed to aggressive chemicals
Товч агуулга
303 stainless steel offers сайн зэврэлт тэсвэрлэлт, тохиромжтой indoor and mildly corrosive environments, but is less resistant than 304 or 316 stainless steel due to its sulfur content. It is ideal for machined components where ease of machining is prioritized, and extreme corrosion resistance is not critical.
Хүйтэн боловсруулалт
Cold Working of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган designed primarily for high machinability. It can be cold worked, but certain limitations apply due to its composition and sulfur content.
1. Хүйтэн боловсруулалтын шинж чанарууд
Болж болно formed, bent, drawn, or stamped энэалласан нөхцөлд.
Work hardens faster than standard 304 stainless steel due to austenitic structure.
Excessive cold working may reduce ductility and increase risk of cracking during machining.
2. Аргууд
Bending and forming: Suitable for moderate bends; use proper tooling to avoid surface cracks.
Deep drawing: Possible, but large reductions may require intermediate annealing.
Stamping: Works well for small to medium parts in annealed condition.
3. Давуу талууд
Cold working improves бат бэх, хатуулаг in the formed part.
Enables creation of precision shapes without high-temperature processing.
4. Хязгаарлалт
Sulfur content may lead to surface defects or micro-cracking if deformation is too severe.
Not recommended for applications requiring maximum corrosion resistance after heavy cold working.
Annealing may be required after extensive forming to restore ductility.
5. Practical Applications
Small mechanical components, fasteners, and gears
Precision parts in automotive, aerospace, and industrial machinery
Components that require moderate forming before machining
Товч агуулга
303 stainless steel can be cold worked effectively for forming, bending, stamping, and drawing operations. While it gains бат бэх, хатуулаг through cold working, careful process control is needed to avoid cracking and maintain corrosion resistance, ингэснээр үүнийг ...-д тохиромжтой болгож байна machined and precision-formed components.
Дулааны боловсруулалт
Heat Treatment of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган голчлон зориулагдсан enhanced machinability. Due to its composition, particularly the high sulfur content, 303 has limited hardenability and heat treatment options compared to martensitic or ferritic stainless steels.
1. Эрдэсжүүлэх
Зорилго: Relieves internal stresses, improves ductility, and softens the steel for easier machining or forming.
Процесс:
Халуусыг хүртэл 1010–1120°C (1850–2050°F).
Hold at temperature for a sufficient time to allow stress relief.
Cool rapidly in water or air to maintain corrosion resistance.
2. Стресс тайлах
Зорилго: Reduces residual stresses caused by machining, cold working, or forming.
Процесс:
Халуусыг хүртэл 450–650°C (840–1200°F).
Hold for 1–2 hours depending on part thickness.
Cool slowly to room temperature.
Helps prevent distortion, warping, or cracking during subsequent fabrication.
3. Hardening
303 stainless steel is not intended for hardening by heat treatment.
It achieves moderate strength дараах замаар cold working rather than quenching and tempering.
4. Практик анхаарах зүйлс
Avoid high-temperature service or heat treatment that can lead to carbide precipitation, reducing corrosion resistance.
Post-heat treatment пассиваци may be applied to restore surface corrosion resistance.
5. Товч агуулга
303 stainless steel has limited heat treatment options due to its sulfur content. Annealing and stress relief are the primary treatments used to relieve internal stresses and restore ductility. Strengthening is achieved mainly through хүйтэн боловсруулалт rather than conventional hardening. This makes 303 ideal for machined, precision components rather than high-strength, heat-treated parts.
Дулаан тэсвэрлэх чадвар
Heat Resistance of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган optimized for high machinability, with good general corrosion resistance. Its heat resistance is дунд зэрэг, making it suitable for applications with intermittent or mild elevated temperatures but not for continuous high-temperature exposure.
1. Температурын хязгаар
Recommended for use up to 870°C (1600°F) intermittently.
Continuous service temperatures should generally not exceed 425–450°C (800–840°F) to maintain mechanical properties and corrosion resistance.
2. Оксидацийн эсэргүүцэл
Санал moderate resistance to oxidation Өндөр температурт.
Sulfur content can slightly reduce oxidation resistance compared to standard 304 stainless steel.
3. Strength at Elevated Temperature
Хамгаалж хадгалах moderate tensile strength and toughness Өндөр температурт.
Extended exposure to high temperatures may result in reduction of corrosion resistance and potential scaling.
4. Хэрэглээ
Components exposed to moderate heat and mechanical stress
Fasteners, gears, and shafts in low- to medium-temperature environments
Industrial machinery operating below 425°C (800°F)
5. Практик анхаарах зүйлс
Тохиромжгүй high-temperature continuous service эсвэл oxidizing environments above 870°C.
For higher temperature resistance, consider 304H, 321, or 310 stainless steels.
Товч агуулга
303 stainless steel has дунд зэргийн халуунд тэсвэртэй, тохиромжтой intermittent or mild elevated temperature applications. Its primary advantages remain high machinability and good corrosion resistance, ингэснээр үүнийг ...-д төгс болгодог precision components operating at low to moderate temperatures.
Хот Воркинг
Hot Working of 303 Stainless Steel
303 stainless steel нь юм австенитлэг зэвэрдэггүй ган зориулсан enhanced machinability. While it can undergo hot working, there are important considerations due to its sulfur content, which can reduce ductility and increase the risk of cracking at high temperatures.
1. Халуун ажиллагааны онцлог
Тохиромжтой forging, rolling, or extrusion Өндөр температурт.
Шаарддаг Анхааралтай температурын хяналт to prevent surface cracking or internal stresses.
Hot working improves formability but does хатуурал мэдэгдэхүйц нэмэгдэхгүй, as 303 is not heat-treatable for hardening.
2. Recommended Temperature Ranges
Annealed temperature: 1010–1120°C (1850–2050°F) for shaping or forging.
Avoid overheating, as temperatures above 1120°C (2050°F) may cause grain growth and reduced corrosion resistance.
Хяналттай cooling (air or water quench) helps preserve mechanical properties.
3. Давуу талууд
Hot working allows for large deformations without excessive tool wear.
Бууруулна mechanical stresses and improves formability for subsequent machining or cold working.
4. Хязгаарлалт
Sulfur content can lead to localized cracking or surface defects if hot worked improperly.
Шаардлагатай програмуудад тохиромжгүй өндөр хатуулаг through heat treatment—strength is primarily achieved through хүйтэн боловсруулалт.
5. Practical Applications
Forged or rolled components requiring subsequent machining
Shafts, gears, and industrial fittings where moderate formability is needed
Automotive or mechanical parts formed before final machining
Товч агуулга
303 stainless steel can be Халуун ажиллагаа үр дүнтэй явагдсан within controlled temperature ranges. While it allows good formability for industrial and mechanical components, care must be taken to avoid cracking and maintain corrosion resistance, as 303 is optimized for machinability rather than high-temperature strength.
