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Help CenterHigh-toughness 1.5752 Carburized Round Steel, 14nicr14 Round Steel for Machining, European Standard 15nicr13 Alloy Steel Bar
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Core pain points and solutions in the industry
In the field of mechanical transmission and load-bearing components, such as heavy-duty gears, drive shafts, spline sleeves, etc., there has long been a difficult problem of difficulty in achieving both surface hardness and core toughness. After quenching, traditional quenched and tempered steels have excessively high core hardness and are prone to brittle fracture. The depth of the carburized layer of ordinary carburized steels does not match well with the strength of the core matrix, resulting in premature failure of parts under alternating loads and impact conditions. At the same time, the precision machining of complex contour components puts strict requirements on the machinability and dimensional stability of steel - problems such as severe work hardening, rapid tool wear, and large heat treatment deformation significantly increase manufacturing costs. Liaocheng Jincheng Yangming Special Steel Co., Ltd., relying on more than ten years of production and operation experience in the special steel field, has launched high-toughness 1.5752 carburized round steel (14NiCr14/15NiCr13 European standard alloy steel bars) in response to the above pain points. Through optimizing the nickel-chromium ratio and controlled rolling and cooling processes, this product ensures that the surface carburized layer reaches a high hardness of 58-62HRC, while enabling the core structure to obtain fine-grained tempered martensite + a small amount of bainite, with an impact toughness increase of more than 30%. At the same time, low-temperature annealing treatment is used to reduce the work hardening tendency, significantly improving tool life and surface finish, and helping customers achieve cost reduction and efficiency improvement from the material source.
Working mechanism and product features
This round steel belongs to nickel-chromium low-carbon carburized steel, and its core mechanism lies in:
· Formation of the carburized layer: In a carburizing atmosphere at 930-950℃, carbon atoms diffuse to the surface to form a high-carbon layer with 0.8-1.2%C. Then, after quenching + low-temperature tempering, high-hardness martensite + carbides are obtained.
· Strengthening of the core matrix: Ni (3.0-3.5%) significantly improves hardenability and reduces the ductile-brittle transition temperature, and Cr (0.6-1.0%) stabilizes carbides and improves wear resistance. After austenitization, the core obtains low-carbon martensite, with the hardness controlled at 30-42HRC, maintaining excellent plasticity and toughness.
· Optimization of machinability: Through isothermal spheroidizing annealing (730-760℃), uniform spherical pearlite is obtained, reducing the hardness to 180-220HB and greatly improving cutting efficiency and tool life.
| Technical parameters | Typical value / Range |
| Grade/Standard correspondence | 1.5752 (DIN 17210) / 14NiCr14 (EN 10084) / 15NiCr13 (EN 10084) |
| Chemical composition (%) | C:0.12-0.18, Si≤0.25, Mn:0.40-0.70, Ni:3.00-3.50, Cr:0.60-1.00, P≤0.025, S≤0.025 |
| Delivery status | Hot-rolled/forged / annealed (HB 180-220) |
| Diameter range (mm) | 20-200 (round steel), square steel/flat steel can be customized |
| Length (mm) | 3000-6000 fixed length / non-fixed length as required |
| Surface quality | Black skin / Turned (Ra≤3.2μm) |
| Effective depth of carburized layer (mm) | 0.8-2.0 (can be adjusted according to the process) |
Core advantages
1. High-toughness matrix: Through scientific Ni/Cr ratio and grain refinement treatment, the impact absorption energy KV2 at the core is ≥55J (20℃), 30% better than conventional carburized steels.
2. Excellent machinability: The hardness in the annealed state is low and uniform. The cutting force is reduced by 15-20% during turning, milling, and drilling, and the tool wear is significantly reduced.
3. Good deformation control: The banded structure is reduced through the controlled rolling process. After carburizing and quenching, the distortion is reduced by 0.05-0.1mm compared with conventional steels, effectively reducing the grinding allowance.
4. Multi-standard compatibility: It meets the standards of DIN 1.5752, EN 14NiCr14, and EN 15NiCr13 at the same time and can replace other Ni-Cr carburized grades, which is convenient for customers to use one material for multiple purposes.
5. Full-process traceability:Each batch of furnace numbers is accompanied by a material report to ensure that the chemical composition, mechanical properties, and macrostructure meet the standards.
Trust Endorsement and Company Advantages
Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng, Shandong. It has been deeply involved in the special steel wholesale industry for many years and mainly deals in precipitation-hardening steel, duplex steel, heat-resistant alloys, and various structural steels. The company has served over 500 customers in fields such as petrochemical, shipbuilding, mining machinery, and construction machinery in total, and has maintained a timely delivery rate of over 98% for a long time. Its customer repurchase rate leads the industry. Relying on its own warehousing and slitting capabilities, the company can maintain a regular inventory of round steel with a diameter of φ20 - 200mm. Orders for standard specifications are shipped within 24 hours. We adhere to the business philosophy of "seeking truth from facts and being honest". Each batch of products is independently inspected to prevent using inferior products to pass off as good ones. If you are troubled by problems such as spalling of the carburized layer of gears, brittle fracture of the core, or low processing efficiency, welcome to contact our technical team. We can provide a free chemical composition and performance prediction report and recommend the best heat treatment process parameters for you. Please contact us for a detailed quotation and sample testing support.
FAQ
Q1: What are the specific differences between 1.5752 round steel and 14NiCr14, 15NiCr13?
A: All three are nickel-chromium low-carbon carburizing steels with similar core elements. 1.5752 is the number of the German standard DIN, while 14NiCr14 and 15NiCr13 are the grades of the EN standard. Among them, 15NiCr13 has a slightly higher upper limit of carbon content (0.13 - 0.19%) and a slightly higher tensile strength. Our company's products can meet all three standards by controlling the composition and can issue corresponding material certificates according to the customer's drawing requirements.
Q2: Is this material suitable for making high-load gears?
A: It is very suitable. The hardness of its carburized layer can reach 58 - 62HRC, and the hardness of the core is 30 - 42HRC. With good toughness, it is widely used in occasions such as heavy-duty vehicle rear axle gears and engineering machinery slewing gears that bear impact and alternating stress. It is recommended to use the carburizing process of direct quenching after carburizing + low-temperature tempering to obtain the best comprehensive performance.
Q3: What are the straightness tolerance and dimensional accuracy of the round steel?
A: The straightness of our hot-rolled round steel is controlled within ≤2mm/m according to the GB/T 702 - 2019 standard; the cold-drawn or turned round steel can reach the h9 - h11 grade accuracy. If you have special requirements for tolerances (such as blanks for precision grinding parts), we can negotiate and customize the finished products for delivery.
Q4: The material is prone to deformation after carburizing and quenching. How to deal with it?
A: Due to the relatively high nickel content of this material, it has good hardenability and low distortion tendency. It is recommended to use a controlled atmosphere carburizing furnace, cool with the furnace to about 500℃ and then air-cool, or use step/isothermal quenching during quenching and cooperate with suitable fixtures to control the deformation within 0.1-0.3mm. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide a reference process curve for heat treatment.
Q5: Can you provide small batch samples for testing?
A: Yes. Liaocheng Jincheng Yangming Special Steel Co., Ltd. supports small batch trial orders, and the minimum order quantity is 1 ton (diameter ≤ 100mm). The sample price is the normal selling price. If you make a subsequent bulk purchase, the sample order fee can be deducted. Please provide the specific specifications to be tested and the requirements for the heat treatment process.
Q6: Does the material contain non-metallic inclusions that are not conducive to processing?
A: Liaocheng Jincheng Yangming Special Steel Co., Ltd. uses high-quality furnace charge and electric furnace refining, and strictly controls the inclusion grades of oxides and sulfides. The purity meets or is better than DIN 50602-4. The center porosity and general porosity of the macrostructure are both ≤ 1.5, ensuring that there are no defects such as cracks and white spots on the processed surface.
Q7: Which countries do you have export experience in?
A: At present, the products have been exported to some countries in Southeast Asia, the Middle East and Europe, and are mainly used in oil downhole tools and mining accessories. The export packaging meets the anti-rust standard for sea transportation, and an EN 10204 3.1 inspection certificate is provided with the goods.
Q8: Does the annealing hardness of 15NiCr13 round steel have a great impact on the tool life?
A: The impact is significant. When the hardness in the annealed state is controlled within the range of 180-220HB, the cutting performance is optimal, and the tool life can be extended by 30-50% compared with the high-hardness state (>250HB). Liaocheng Jincheng Yangming Special Steel Co., Ltd. strictly controls the annealing process to ensure the uniformity of hardness, which is convenient for customers to formulate a stable processing rhythm.
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