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Help CenterFree-cutting Steel Sae1117, 1118 Round Steel, 1215ms Round Bar, Cold-drawn Bright Round With Diameters Ranging From 6 to 220, Complete Specifications
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Industry Pain Points and Solutions
In the fields of precision machining and automotive parts manufacturing, the cutting performance of materials directly affects machining efficiency, tool life, and the surface quality of finished products. Traditional carbon steels often have problems such as high cutting resistance, difficult chip breaking, and high surface roughness of the machined surface, resulting in low production efficiency and high costs. In response to this core pain point, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has launched a series of products of Free-cutting Steel SAE1117 / 1118 / 1215MS Round Steel and Cold-drawn Bright Round Steel based on its years of experience in the R & D and production of special steels. Through precise control of elements such as sulfur, lead, and calcium, this series significantly improves the cutting performance of the steel, achieving a significant effect of increasing machining efficiency by more than 30% and reducing tool wear by 40%, helping downstream enterprises effectively reduce costs and increase efficiency.
Working Mechanism and Technical Principle
The core of free-cutting steel lies in adding free-cutting elements such as sulfur (S), lead (Pb), and calcium (Ca) to the steel to form non-metallic inclusions (such as MnS). These inclusions play the roles of stress concentration and lubrication during the cutting process, making the chips easy to break into short fragments and significantly reducing the cutting force. SAE1117 and 1118 belong to sulfur-based free-cutting steels, with a sulfur content of about 0.08 - 0.33%, suitable for high-speed cutting on automatic lathes; 1215MS belongs to high-sulfur free-cutting steel, with a higher sulfur content and optimized with phosphorus and manganese elements, having better chip-breaking performance. The cold-drawn bright round steel process achieves a surface finish of Ra0.8 - 1.6μm through multiple cold drawing and straightening processes, and the dimensional tolerance is controlled at the h9 - h11 level, which can be used directly without subsequent finishing.
Product Features and Advantages
- Complete Specifications: Round steel/round bars with diameters ranging from 6 to 220mm, covering common sizes, supporting non-standard fixed lengths, with sufficient inventory and quick delivery available.
- Excellent Cutting Performance: Compared with ordinary carbon steels, the cutting speed can be increased by 20 - 50%, the surface finish can be improved by 1 - 2 grades, and the tool life can be extended by 30 - 60%.
- High Surface Quality: The surface of the cold-drawn bright round steel is free of oxide scale and cracks, with good finish, suitable for direct turning of precision parts.
- Uniform and Stable Material: Adopt electric furnace smelting + out-of-furnace refining process, strictly control the fluctuation of chemical composition, and ensure batch consistency.
- Widely used: Suitable for processing precision shaft parts, screws, nuts, gears, hydraulic parts, etc. on automatic lathes and CNC lathes.
| Grade | Main components (typical values) | Tensile strength (MPa) | Hardness (HB) | Application characteristics |
| SAE1117 | C 0.14-0.20, Mn 1.00-1.30, S 0.08-0.13 | 380-520 | ≤170 | Good plasticity, suitable for cold heading and automatic turning |
| SAE1118 | C 0.14-0.20, Mn 1.30-1.60, S 0.08-0.13 | 430-560 | ≤180 | Slightly higher strength, suitable for medium-load parts |
| 1215MS | C ≤0.09, Mn 0.75-1.05, P 0.04-0.09, S 0.26-0.35 | 390-540 | ≤160 | High-sulfur free-cutting, excellent chip-breaking performance |
Technical specifications and processing details
Diameter tolerance of cold-drawn bright round bars: h9 grade (±0.036mm) for 6-12mm, h10 grade (±0.058mm) for 12-30mm, h11 grade (±0.140mm) for 30-80mm, h11 grade (±0.200mm) for 80-220mm. Straightness ≤0.5mm/m, surface roughness Ra ≤1.6μm. Can be delivered in annealed, normalized or quenched and tempered states to meet the subsequent heat treatment requirements of different customers. The product complies with SAE J403Standards and ASTM A29 specifications.
Endorsement and Company Advantages
Liaocheng Jincheng Yangming Special Steel Co., Ltd. has been deeply involved in the special steel field for many years. It is equipped with advanced production equipment and testing methods, including direct-reading spectrometers, universal testing machines, hardness testers, etc., to ensure that each batch of products undergoes strict inspection before leaving the factory. The company adheres to the business philosophy of "seeking truth from facts and being honest", and has accumulated a good reputation in industries such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery. We provide comprehensive pre-sales technical consultation, customized specification services, and fast logistics and distribution. Choosing our free-cutting steel means choosing efficiency, stability, and reliability.
Consultation Advice
If you are looking for free-cutting steel materials suitable for automatic lathes or CNC machining, you are welcome to contact us at any time to obtain samples or technical information. Our engineers can recommend the most suitable grades and sizes based on your specific processing parameters to help optimize your production process. Please call or leave an online message, and we will respond immediately.
FAQ
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What are the differences in cutting performance between SAE1117 and 1215MS?
SAE1117 is a medium-sulfur free-cutting steel (S content 0.08 - 0.13%), suitable for general high-speed cutting with good chip-breaking effect; 1215MS is a high-sulfur free-cutting steel (S content 0.26 - 0.35%), with better chip-breaking performance, especially suitable for precision machining of long-chip materials. However, it should be noted that too high sulfur content may affect the welding performance. -
What level of surface finish can the cold-drawn bright round bars achieve?
The surface roughness of our cold-drawn bright round bars is controlled at Ra0.8 - 1.6μm, without oxide scale and scratches. They can be directly used for turning, reducing pre-processing procedures and improving efficiency. -
Can round bars with a diameter of 220mm also be cold-drawn?
A diameter of 220mm is the maximum specification of our cold-drawn bright round bars. After multiple passes of drawing and precise straightening, they can fully meet the requirements of large-size parts. Please consult the sales engineer for specific tolerances and delivery conditions. -
Is this batch of materials suitable for making hydraulic valve cores?
Free-cutting steels SAE1117/1118/1215MS are commonly used for parts such as hydraulic valve cores and joints due to their good machinability. However, it should be noted that the material hardness is relatively low. If high wear resistance is required, it is recommended to choose grades after carburizing or quenching and tempering treatment. We can provide materials in different states. -
How to ensure the stability of chemical composition between batches?
We adopt the electric furnace smelting + secondary refining (LF + VD) process and are equipped with a direct-reading spectrometer for analysis of each furnace to ensure that the fluctuation range of key elements such as sulfur, phosphorus, and manganese is controlled within ±0.01% of the standard value. -
Are there any environmental restrictions on the products? For example, the lead content?
SAE1117/1118 and 1215MS are both lead-free or low-lead free-cutting steels (lead content ≤0.15% or not added), which meet the environmental requirements of RoHS and REACH. They can be used with confidence in exports and fields with strict environmental requirements. -
Can you provide small-batch samples? What is the minimum order quantity?
We support small-batch samples. The minimum order quantity for regular specifications is 100 kilograms, and that for special specifications depends on the production situation. Welcome to request samples for processing tests. -
What is the general delivery cycle?
Standard specifications (diameter 6 - 50mm) with sufficient inventory are usually shipped within 3 - 5 days, while non-standard sizes or special states require 7 - 15 days. Please confirm the specific delivery date when placing an order.
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