| Material Group | P - Steel |
| Sub-Group | Carbon Steel |
| Tensile Strength | 640-840[N/mm^2] |
| Machinability | 65% |
1330 steel, a manganese-chromium alloy steel, offers a combination of strength, toughness, and hardenability. While its alloying elements enhance its mechanical properties, they also present certain challenges during machining that require careful consideration.
Understanding the Machinability of 1330 Steel:
Composition: 1330 steel typically contains around 0.28-0.33% carbon, 1.60-1.90% manganese, and 0.80-1.10% chromium. These alloying elements contribute to its strength, hardenability, and wear resistance, but can also increase its hardness and abrasiveness, potentially leading to increased tool wear and difficulties in chip formation.
Applications: 1330 steel is commonly used for gears, shafts, axles, and other components requiring high strength, toughness, and wear resistance.
Overcoming Machinability Challenges:
Tool Selection: Choose cutting tools specifically designed for alloy steels or materials with similar properties. Carbide tools with appropriate coatings, such as TiAlN or AlTiN, can enhance tool life and cutting performance in machining 1330 steel.
Cutting Parameters: Adjust cutting speeds and feeds based on the specific heat treatment and hardness of the 1330 steel. Generally, moderate cutting speeds are recommended, with careful attention to feed rates and tool wear to prevent work hardening. For hardened 1330 steel, consider lower cutting speeds and increased feed rates.
Coolant/Lubricant: Utilize a suitable coolant or lubricant to reduce heat, friction, and chip welding during machining. Water-based coolants or cutting oils with additives for improved lubricity are often recommended for alloy steels.
Chip Control: Employ chipbreakers or specialized tool geometries to promote chip breaking and prevent long, stringy chips that can interfere with the machining process and potentially damage the workpiece or tool. Chip control is crucial for 1330 steel due to its alloying elements and potential for work hardening.
Additional Tips for Machining 1330 Steel:
By understanding the unique characteristics of 1330 steel and implementing these strategies, machinists can effectively manage its machining challenges and achieve desired results in terms of productivity, tool life, and surface finish.
For detailed carbide grade and cutting speed recommendations, refer to resources like the material supplier's datasheet or consult with a machining expert familiar with alloy steels.
| Standard | Name |
|---|---|
| SAE | 1330 |
| WNR | 1.1170 |
| DIN | 28Mn6 |
| BS | 150M28 |
| ANFOR | 20M5 |
| UNI | C28Mn |
| JS1 | SCMn1 |
| Element | Percentage (%) |
| Carbon (C) | 0.28 - 0.33 |
| Manganese (Mn) | 1.60 - 1.90 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | 0.15 - 0.30 |
| Iron (Fe) | Balance |
Please note that there might be trace amounts of other elements like chromium (Cr) and nickel (Ni) present, but these are not considered essential components of 1330 steel.
If you require the precise composition for a specific batch or supplier of 1330 steel, it's always recommended to refer to the material's certification or datasheet.
| Application | mm/min | SFM |
|---|---|---|
| Turning | 240-330 | 790-1080 |
| Milling | 150-205 | 490-670 |
| Parting | 115-155 | 380-510 |
| Grooving | 135-185 | 440-610 |
| Drilling | 95-130 | 310-430 |
While machining guidelines for 1330 steel provide a starting point, achieving optimal cutting speeds in real-world scenarios demands a nuanced understanding of the factors influencing cutting performance. The estimated speeds are based on idealized conditions, which may not always be replicated in practice.
Factors Affecting Cutting Speed in 1330 Steel:
Carbide Grade: Selecting the appropriate carbide grade is paramount. Though 1330 steel offers decent machinability, the specific grade should be tailored to the specific cutting conditions, desired surface finish, and tool life expectations. The presence of alloying elements like manganese and chromium can influence tool wear, so consider grades designed for alloy steels or those with enhanced wear resistance.
Tool and Workpiece Clamping: Secure and rigid clamping of both the cutting tool and the workpiece is fundamental. Vibrations and movement can severely impact accuracy, surface finish, and tool life. Employ proper clamping techniques and utilize high-quality tooling systems to mitigate these risks, especially crucial when dealing with the moderate to high hardness of 1330 steel.
Raw Material Quality: Variations in raw material quality, encompassing chemical composition, heat treatment, and microstructure, can significantly affect machinability. Source high-quality 1330 steel from reputable suppliers and verify its properties to ensure consistent and predictable machining performance.
Tool Overhang: A shorter tool overhang minimizes deflection and vibration, leading to improved cutting stability and surface finish. Strive for the shortest possible overhang without compromising tool reach and accessibility, especially when machining thicker 1330 steel sections or encountering interrupted cuts.
Material Hardness: The hardness of the 1330 steel workpiece directly influences cutting forces and tool wear. Verify that the material's hardness falls within the expected range for the chosen carbide grade and cutting parameters. If needed, consider preheating or adjusting cutting parameters to accommodate variations in hardness due to work hardening.
Additional Factors:
By meticulously evaluating these factors and adjusting cutting speeds accordingly, you can fine-tune your machining process to achieve superior results when working with 1330 steel. Remember, the recommended cutting speeds are a guideline, and real-world optimization requires a holistic approach that considers the entire machining ecosystem.
Disclaimer: The information provided here is intended as a general guideline. It is crucial to consult with tooling experts, refer to manufacturer recommendations, and conduct thorough testing to determine the optimal cutting parameters for your specific application and the specific properties of your 1330 steel.
| Honing Siz | 0.05-0.08 mm / 0.002-0.003" |
| Rake Angl | 11° -13° |
| Land Angl | Positive |
| Land Widt | 0.20-0.30 mm / 0.008-0.012" |
