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Help CenterFree-cutting Alloy 16mncrs5 Carburized Round Steel, German Standard 1.7139 Steel Bar, the Main Steel for Manufacturing Gear Parts
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Industry Pain Points and Solutions: In the field of mechanical transmission, gear parts have extremely strict requirements for the comprehensive performance of materials. They need to obtain high hardness after surface carburizing to resist wear, and at the same time, the core needs to maintain good toughness and fatigue resistance. Although traditional carburizing steels such as 20CrMnTi are widely used, in large - volume high - speed cutting processes, the tool wear is severe and the processing efficiency is low, resulting in high production costs. Meanwhile, it is difficult to ensure the dimensional accuracy and surface quality of gears due to the cutting difficulties. In response to this core pain point, Free - cutting alloy 16MnCrS5 carburizing round steel (German standard 1.7139) long - term operated and supplied by Liaocheng Jincheng Yangming Special Steel Co., Ltd. By precisely adding sulfur and optimizing the alloy ratio, while maintaining excellent carburizing performance, the machinability of the material is significantly improved. Our company is located in Liaocheng City, Shandong Province. We have been deeply involved in the special steel field for many years, mainly dealing in high - end varieties such as precipitation - hardening steel, duplex steel, and heat - resistant steel. With the business philosophy of "seeking truth from facts and being honest - oriented", we have accumulated a good reputation among customers in industries such as petrochemical, shipbuilding, nuclear engineering, and aerospace. We transform the frontier achievements of materials science into actual productivity, providing high - quality and high - efficiency ideal raw materials for gear manufacturing enterprises.
Working Mechanism and Product Features: 16MnCrS5 belongs to low - alloy carburizing steel. Its core working mechanism is to increase the carbon concentration on the surface through surface carburizing heat treatment. After quenching, a high - carbon martensite layer (hardness can reach HRC58 - 62) is obtained, while the core maintains a low - carbon tempered martensite or bainite structure (hardness is about HRC30 - 40), thus achieving a performance gradient of "hard outside and tough inside". Compared with ordinary 16MnCr5, this grade additionally adds 0.020%~0.040% sulfur. Sulfur forms dispersed MnS inclusions in the steel, which play a role in chip breaking and lubrication during the cutting process, greatly reducing the cutting force and tool wear. It is especially suitable for gear processing procedures such as hobbing, gear shaping, and broaching. The main features include:
- Excellent free - cutting performance: The sulfur content is controlled within the optimal range, the chips are easy to break, the machined surface finish is high, and the tool life is extended by 30%~50%.
- Stable carburized layer depth control: The alloy elements Cr and Mn ensure the uniformity and hardenability of the carburized layer, suitable for gears with a module of 2~8.
- Good fatigue resistance: The core has sufficient toughness and can withstand high contact stress and bending stress, suitable for heavy - load transmission gears.
- High dimensional stability: The heat treatment deformation is small, the subsequent finishing allowance is small, and the yield rate is improved.
| Element | C | Si | Mn | P | S | Cr |
| Content (%) | 0.14-0.19 | ≤0.40 | 1.00-1.30 | ≤0.025 | 0.020-0.040 | 0.80-1.10 |
| Mechanical properties (after quenching and tempering) | Tensile strength Rm (MPa) | Yield strength Re (MPa) | Elongation after fracture A (%) | Impact energy KV (J) |
| Typical value | 700-850 | ≥450 | ≥12 | ≥27 |
This steel grade is suitable for a variety of carburizing heat treatment processes, such as gas carburizing and vacuum carburizing. Customized heat treatment suggestions can be provided according to the carburized layer depth (0.5 - 2.0mm) required by customers. In the typical process route of gear manufacturing: forging → normalizing → rough machining → carburizing and quenching + low-temperature tempering → finishing, 16MnCrS5 performs stably at each stage. Especially during finishing, the cutting force is significantly reduced, effectively reducing the frequency of tool replacement and improving the overall production capacity.
Trust endorsement and consultation advice: Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always put product quality and customer reputation first. Each batch of 16MnCrS5 round steel we supply strictly adheres to the DIN EN 10084 standard and comes with a formal quality guarantee, ensuring that the chemical composition and mechanical properties are traceable. The company is located in Liaocheng, Shandong, and relying on a convenient logistics network, it can quickly respond to the order requirements of manufacturing customers in North China, East China and other regions. In previous cooperation, we have provided stable supplies for many gear and reducer manufacturing enterprises, and customers have reported good material consistency and significantly improved processing efficiency. We are well aware that gear manufacturing has extremely high requirements for material stability. Therefore, we suggest that you conduct a small-sample trial processing before bulk purchasing to verify the compatibility with your company's heat treatment process. If you have any questions about the supply specifications, delivery status (hot-rolled/annealed/normalized/turned and peeled) or technical parameters of this grade, please feel free to contact our technical team at any time. We will recommend the optimal solution based on your specific working conditions and provide reliable technical support for subsequent continuous cooperation. Avoid processing failures and cost losses caused by improper material selection. Start with professional material selection - Liaocheng Jincheng Yangming Special Steel Co., Ltd. looks forward to sincere cooperation with you.
FAQ:
1. Compared with ordinary 16MnCr5, how much improvement is there in the cutting performance of 16MnCrS5? Due to the increase of sulfur content to 0.020%-0.040% in 16MnCrS5, the cutting force is reduced by about 20%-30%, and the tool life is extended by more than 30%. It is especially suitable for automated processing such as high-speed hobbing and gear shaping, which can effectively reduce the downtime for tool replacement.
2. What surface hardness can this material reach after carburizing? What is the range of core hardness? After carburizing and quenching + low-temperature tempering, the surface hardness is usually HRC58-62. The core hardness generally ranges from HRC30-40 depending on the cross-sectional size, meeting the dual requirements of gears for wear resistance and toughness.
3. Is 16MnCrS5 suitable for large-module gears (module ≥ 8)? This steel grade has medium hardenability and is more suitable for small and medium-module gears with a module of 2-6. For large-module gears, it is recommended to consider grades with better hardenability such as 20CrMnTiH or 20CrNiMo. If specific technical selection is required, detailed parameters can be provided for the engineers of Liaocheng Jincheng Yangming Special Steel Co., Ltd. to assist in the evaluation.
4. What delivery states can your company provide? Do you support peeling or polishing finishing? We can provide various delivery forms such as hot-rolled black round steel, annealed state, normalized state, and turned and peeled (bright material). The surface roughness of the peeled material can reach Ra ≤ 3.2μm, which can be directly used for CNC turning, reducing the pre-processing allowance.
5. Is there a risk of deformation or cracking during the heat treatment process of 16MnCrS5? Compared with steel grades with lower sulfur content, sulfur has a certain influence on quenching deformation, but the deformation can be effectively controlled through reasonable heat treatment processes (such as pre-cooling quenching and isothermal quenching). Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide reference suggestions for heat treatment processes to help customers optimize process parameters.
6. Is this material suitable for the manufacturing of new energy vehicle gears? New energy vehicle gears have higher requirements for lightweight, low noise, and high fatigue life. 16MnCrS5 is maturely applied in the field of traditional fuel vehicle gears and is also suitable for some auxiliary transmission parts of electric vehicles, but the main reduction gears mostly use carburized steels with higher performance such as 20CrMnTiH3 or grades with higher alloy content. Please evaluate according to the specific working conditions.
7. How is the consistency of the chemical composition of each batch of materials ensured? We conduct full-element analysis on each heat using a direct-reading spectrometer and keep samples for future reference. The quality assurance certificate is provided with the goods to ensure that the composition fluctuation of the same batch is within the standard range, and the deviation of key elements such as C, Mn, and Cr is less than 0.03%.
8. Do you accept small orders of less than 15 tons? What is the minimum order quantity? We support small trial orders, and the minimum order quantity is usually 1 ton. For new customers, it is recommended to purchase 1-2 tons for process verification first, and then expand the batch after confirming the qualification to reduce the trial cost.
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