تقدم
AISI 1018 mild/low carbon steel has excellent weldability, produces a uniform and harder case and it is considered the best steel for carburized parts. AISI 1018 mild/low carbon steel offers a good balance of toughness, strength and ductility. AISI 1018 hot rolled steel has significant mechanical properties, improved machining characteristics and has a high Brinell hardness measure.
التركيب الكيميائي
| عنصر | محتوى |
|---|---|
| كربون, ج | 0.14 – 0.20 % |
| حديد, Fe | 98.81 – 99.26 % (as remainder) |
| المنغنيز, مينيسوتا | 0.60 – 0.90 % |
| الفوسفور, ص | ≤ 0.040 % |
| كبريت, س | ≤ 0.050 % |
الخصائص الفيزيائية
| الخصائص الفيزيائية | قياس | إمبراطوري |
|---|---|---|
| كثافة | 7.87 مجلس التعاون الخليجي | 0.284 رطل / في3 |
الخصائص الميكانيكية
| الخصائص الميكانيكية | قياس | إمبراطوري |
|---|---|---|
| صلابة, برينل | 126 | 126 |
| صلابة, زر (تم تحويله من صلابة برينل) | 145 | 145 |
| صلابة, روكويل ب (تم تحويله من صلابة برينل) | 71 | 71 |
| صلابة, فيكرز (تم تحويله من صلابة برينل) | 131 | 131 |
| قوة الشد, ذروة | 440 الآلام والكروب الذهنية | 63800 رطل |
| قوة الشد, أَثْمَر | 370 الآلام والكروب الذهنية | 53700 رطل |
| استطالة عند الكسر (في 50 مم) | 15.0 % | 15.0 % |
| الحد من منطقة | 40.0 % | 40.0 % |
| معامل المرونة (نموذجي للصلب) | 205 المعدل التراكمي | 29700 ksi |
| معامل الحجم (نموذجي للصلب) | 140 المعدل التراكمي | 20300 ksi |
| نسبة الحوت (نموذجي للصلب) | 0.290 | 0.290 |
| آلية (Based on AISI 1212 فُولاَذ. as 100% machinability) | 70 % | 70 % |
| معامل القص (نموذجي للصلب) | 80.0 المعدل التراكمي | 11600 ksi |
Electrical Properties
| Electrical Properties | قياس | English | Comments |
|---|---|---|---|
| Electrical resistivity @0°C (32درجة فهرنهايت) | 0.0000159 Ω-cm | 0.0000159 Ω-cm | annealed condition |
| @100 °C/ 212 درجة فهرنهايت | 0.0000219 Ω-cm | 0.0000219 Ω-cm | annealed condition |
| @ 200 °C/392 °F | 0.0000293 Ω-cm | 0.0000293 Ω-cm | annealed condition |
المعالجة الحرارية
The heat treatment for AISI 1018 mild/low carbon steel consists of the following processes:
- التطبيع – AISI 1018 mild/low carbon steel should be heated at 890°C – 940°C and then cooled in still air.
- صقل – This process requires heating at 1150°C – 1280°C and AISI 1018 mild/low carbon steel is held until the temperature becomes constant. 900°C is the minimum temperature required for the forging process. The steel is cooled in air after this process.
- تلطيف – AISI 1018 mild/low carbon steel is tempered at 150°C – 200°C to improve case toughness. This process has little or no effect on hardness. Grinding cracks are reduced when AISI 1018 mild/low carbon steel is tempered.
- التلدين – The AISI 1018 mild/low carbon steel is heated at 870°C – 910°C and allowed to cool in a furnace.
- Stress Relieving – A temperature of 500°C – 700°C is required to relieve stress in AISI 1018 mild/low carbon steel that is later cooled down in still air.
- Case Hardening – This process requires heating to be carried out between 780°C – 820°C. AISI 1018 mild/low carbon steel is then quenched in water.
- Core Refining – This is an optional process that requires heating at 880°C – 920°C. After being heated, AISI 1018 mild/low carbon steel is moistened in oil or water.
- Carburizing – This process takes place at 880°C – 920°C for AISI 1018 mild/low carbon steel. It is used in bending, crimping and swaging processes and is widely used for fixtures, mounting plates and spacers and in applications that do not need high alloy steel and high carbon strength. Carburized parts that include worms, التروس, pins, dowels, non-critical components of tool and die sets, tool holders, pinions, machine parts, ratchets, dowels and chain pins use AISI 1018 mild/low carbon steel.
