وینزہو کیکسن کیکسن میٹل کمپنی ، لمیٹڈ
سٹینلیس سٹیل کیا ہے؟ 303 (UNS S30300)1.4305?
سٹینلیس سٹیل 303 is the classic free-machining austenitic stainless steel grade. Our material is certified to ASTM F899 (Standard Specification for Wrought Stainless Steel For Surgical Instruments) and ISO 7151 (Surgical Instruments) making it ideal for a range of applications from sanitary wares to micro-mechanical engineering components.
Stainless steel grade 303 can only be strengthened by cold working, not heat treatment, which can lead to the formation of alpha ferrite martensite, considerably increasing its ferromagnetism up to a relative magnetic permeability > 1. The presence of MnS inclusions and of delta ferrite may increasing the difficulty in polishing this grade.
Non-medical versions of 303 stainless steel are available to AMS 5640 in two different types depending on the addition of Sulphur (AMS 5640 قسم 1) or Selenium (AMS 5640 قسم 2).
303 سٹینلیس سٹیل 1.4305 Forms
303 stainless steel rods and round bars are often used in applications requiring heavy machining to fabricate parts. They are often used in parts such as screws, gears, nuts and bolts, electrical switchgear components, and aircraft fittings.
- Hex Bars and Rods
303 stainless steel hex bars and rods enable faster machining and lower production costs. Although they have less corrosion resistance than other grades of stainless steel, 303 stainless steel hex bars and rods offer excellent toughness.
Square Bars
Square bars made with 303 stainless steel can resist scaling at up to 871 °C. Compared to conventional stainless steel square bars, the sulfur component helps improve turning breakup while simultaneously reducing cutting tool drag.
- Flat Bars
For parts that require sufficient corrosion resistance and need to be machined, ground, or polished, 303 stainless steel flat bars are useful for many applications.
کے لیے درخواستیں 303 سٹینلیس سٹیل
303 stainless steel tube/bar/sheet materials are used in many applications to fabricate a wide range of parts, including:
- Bushings
- Shafts
- Nut and bolts
- Gears
- Electrical switchgear components
- Aircraft fittings
ایگریڈ کے مساوی 303
| یورپی یونین میں | USA – | جاپان وہ | فرانس افنور | انگلینڈ بی ایس | سویڈن ایس ایس |
| X8CrNiS18-9 | 303 | SUS303 | Z8CNF18-09 | 303S31 | 2346 |
کمپوزیشن کے لیے 303 سٹینلیس سٹیل کا گریڈ
مکینیکل پراپرٹیز
| گریڈ | 303 |
| تناؤ کی طاقت (ایم پی اے) | 500-750 ایم پی اے |
| Proof Stress (ایم پی اے) | 190 Min MPa |
| Elongation A5 mm | 35 کم از کم % |
| Hardness Brinell | 230 Max HB |
فزیکل پراپرٹیز
| Physical Property | قدر |
| کثافت | 8.03 g/cm³ |
| میلٹنگ پوائنٹ | 1455 °C |
| تھرمل توسیع | 17.3 x10^-6 /K |
| لچک کا ماڈیولس | 193 جی پی اے |
| تھرمل چالکتا | 16.3 W/m.K |
| برقی مزاحمتی صلاحیت | 0.72 x10^-6 Ω .m |
Corrosion and Oxidisation Resistance of 303
303 Stainless Steel shows good corrosion and oxidisation resistance in mildly corrosive atmospheric environments. Its sulphide inclusions act as pit initiation sites meaning it provides a lot less resistance than 304.
گریڈ 303 should not be exposed to marine or other similar environments, to prevent rapid pitting corrosion.
میں 1.4305 303 Stainless Steel provides good oxidisation resistance in intermittent service to 760°C (1400°F) and continuous service to 870°C (1,598°F)
The use of 303 stainless steel is not recommended in the range of 425-860°C (797-1580°F) due to carbide precipitation.
303 is susceptible to sensitisation.
HEAT RESISTANCE
- Good oxidation resistance at temperatures up to 1700oF (927 oC)
- Continuous use at temperatures above 1400oF (760oC) is not usually recommended due to carbide precipitation which can lead to irregular scaling
- Does not have a low carbon content so it is also vulnerable to sensitisation
گرمی کا علاج
ANNEALING
This operation should be carried out at 1850/1950 ºF (1010/1065ºC) followed by water quenching. قسم 303, as type 302, should not be subjected to temperatures between 800/1650 ºF (425/900ºC) nor slowly cooled through that temperature range, to prevent intergranular corrosion.
FORGING STAINLESS STEEL 303
The piece to be forged should be heated to 2100/2300ºF (1150/1260ºC) and not forged below 1700ºF (925ºC.) Parts may be air cooled with no danger of cracking and for maximum corrosion resistance small parts may be water quenched directly off the hammer. Large parts should be annealed after forging.
Cold Working
303 is not readily cold workable. Some cold working is possible but sharp bending should not be attempted.
گرم کام کرنا
Fabrication methods like forging, جس میں گرم کام کرنا شامل ہے 1149-1260 ° C پر یکساں حرارت کے بعد ہونا چاہئے۔. اس کے بعد زیادہ سے زیادہ سنکنرن مزاحمت کو یقینی بنانے کے لیے من گھڑت اجزاء کو تیزی سے ٹھنڈا کیا جانا چاہیے۔.
MACHINABILITY
- گریڈ 303 stainless steel has excellent machinability. Machining can be enhanced by adhering to the following rules:
- کٹنگ کناروں کو تیز رکھنا ضروری ہے۔. خستہ کناروں کی وجہ سے زیادہ کام سخت ہو جاتا ہے۔.
- کٹ ہلکے لیکن اتنے گہرے ہونے چاہئیں کہ مواد کی سطح پر سوار ہونے سے کام کو سخت ہونے سے روکا جا سکے۔.
- چپ بریکرز کو اس بات کو یقینی بنانے میں مدد کے لیے استعمال کیا جانا چاہیے کہ جھاڑو کام سے صاف رہے۔
- آسٹینیٹک مرکب دھاتوں کی کم تھرمل چالکتا کے نتیجے میں گرمی کٹنگ کناروں پر مرکوز ہوتی ہے۔. اس کا مطلب ہے کہ کولنٹ اور چکنا کرنے والے مادے ضروری ہیں اور ان کا استعمال بڑی مقدار میں ہونا چاہیے۔.
ویلڈنگ
کی ویلڈنگ 303 Stainless is not recommended however if this is if unavoidable then use 308L or 309 for electrodes. 303 must be annealed for optimal corrosion protection.
For optimal annealing heat to 1010-1120°C (1850-2048°F) and cool rapidly with air or water.
میں 1.4305 303 stainless steel cannot be hardened by thermal treatment.°