ПРОГРЕСС
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.
Химический состав
| Элемент | Содержание |
|---|---|
| Углерод, С | 0.14 – 0.20 % |
| Железо, Фе | 98.81 – 99.26 % (as remainder) |
| Марганец, Мин. | 0.60 – 0.90 % |
| фосфористый, п | ≤ 0.040 % |
| сера, С | ≤ 0.050 % |
Physical Properties
| Physical Properties | Метрика | Империал |
|---|---|---|
| Плотность | 7.87 g/cc | 0.284 фунт/дюйм3 |
Механические свойства
| Механические свойства | Метрика | Империал |
|---|---|---|
| Твердость, Brinell | 126 | 126 |
| Твердость, Knoop (Converted from Brinell hardness) | 145 | 145 |
| Твердость, Rockwell B (Converted from Brinell hardness) | 71 | 71 |
| Твердость, Vickers (Converted from Brinell hardness) | 131 | 131 |
| Предел прочности, Окончательный | 440 МПа | 63800 пси |
| Предел прочности, Урожай | 370 МПа | 53700 пси |
| Удлинение при разрыве (В 50 мм) | 15.0 % | 15.0 % |
| Reduction of Area | 40.0 % | 40.0 % |
| Модуль упругости (Typical for steel) | 205 ГПа | 29700 кси |
| Объемный модуль (Typical for steel) | 140 ГПа | 20300 кси |
| Соотношение Рыб (Typical For Steel) | 0.290 | 0.290 |
| Machinability (Based on AISI 1212 сталь. as 100% machinability) | 70 % | 70 % |
| Модуль сдвига (Typical for steel) | 80.0 ГПа | 11600 кси |
Electrical Properties
| Electrical Properties | Метрика | English | Comments |
|---|---|---|---|
| Electrical resistivity @0°C (32°F) | 0.0000159 Ω-cm | 0.0000159 Ω-cm | annealed condition |
| @100 °C/ 212 °F | 0.0000219 Ω-cm | 0.0000219 Ω-cm | annealed condition |
| @ 200 °C/392 °F | 0.0000293 Ω-cm | 0.0000293 Ω-cm | annealed condition |
Heat Treatment
The heat treatment for AISI 1018 mild/low carbon steel consists of the following processes:
- Normalizing – AISI 1018 mild/low carbon steel should be heated at 890°C – 940°C and then cooled in still air.
- Forging – 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.
- Tempering – 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.
- Annealing – 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, шестерни, 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.
