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Help CenterHigh-strength Medium-carbon Alloy Structural Round Steel of 40crmnmoa, Alloy Round Bar for Heavy-duty Gear Shafts of 20crmnmoa
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Industry Pain Points and Solutions: In the fields of heavy-duty gear shafts, drive shafts, mining machinery, etc., traditional medium-carbon steels often have problems such as insufficient strength, poor toughness, and short fatigue life, resulting in frequent equipment downtime and high maintenance costs. Especially under the working conditions of large cross-sections and high stresses, ordinary steels are prone to defects such as non-through hardening in the core and deformation cracking. Liaocheng Jincheng Yangming Special Steel Co., Ltd., relying on years of special steel production experience, selects high-quality raw materials and launches high-strength 40CrMnMoA medium-carbon alloy structural round steel and 20CrMnMoA alloy round bars through strict smelting, rolling, and subsequent heat treatment processes. These two materials have excellent hardenability and a good match of strength and toughness, which can significantly improve the bearing capacity and service life of key components such as heavy-duty gear shafts and effectively solve the industry pain points. The company is located in Liaocheng, Shandong, and is specialized in the production and operation of special steels. It always adheres to the principle of seeking truth from facts and being honest and has accumulated a good reputation among the industry and customers.
Product Working Mechanism and Characteristics:
- Optimized Chemical Composition: Both 40CrMnMoA and 20CrMnMoA belong to medium-carbon alloy structural steels. By adding alloy elements such as Cr, Mn, and Mo, the hardenability and tempering stability are improved. The carbon content of 40CrMnMoA is about 0.37%-0.44%, and that of 20CrMnMoA is about 0.17%-0.23%, which are suitable for different carburizing or quenching and tempering process requirements.
- Smelting and Rolling: The electric furnace + LF + VD refining process is adopted to effectively remove harmful impurities in the steel and control the gas content, ensuring the purity of the steel. The round bars are rolled through multiple passes of temperature-controlled rolling, with a uniform and dense structure and excellent surface quality.
- Heat Treatment Adaptability: Annealing, normalizing, quenching and tempering, or carburizing pretreatment states can be provided according to user requirements. After quenching and tempering, 40CrMnMoA has excellent comprehensive mechanical properties, and the tensile strength can reach 980-1080MPa (the specific value complies with the national standard); 20CrMnMoA has high surface hardness and good core toughness after carburizing and quenching, which is suitable for heavy-duty gear shafts.
Technical Specifications (refer to GB/T 3077):
| Grade | C (%) | Si (%) | Mn (%) | Cr (%) | Mo (%) |
| 40CrMnMoA | 0.37-0.44 | 0.17-0.37 | 0.90-1.20 | 0.90-1.20 | 0.15-0.25 |
| 20CrMnMoA | 0.17-0.23 | 0.17-0.37 | 0.90-1.20 | 1.10-1.40 | 0.20-0.30 |
Core Advantages of the Product:
- High Purity and Low Impurities: Through external refining + vacuum degassing, the oxygen content in the steel is ≤20ppm, and the non-metallic inclusion level is better than the national standard requirements, effectively improving the fatigue life.
- Excellent Hardenability: The critical hardenability diameter of 40CrMnMoA can reach 60-80mm (oil quenching). After carburizing, the core hardness of 20CrMnMoA is uniform, which is suitable for large-section heavy-duty gear shafts.
- Ensured Dimensional Accuracy: The diameter tolerance of the round bar is controlled within ±0.5mm (applicable to the hot-rolled state). It can be provided in the turned or ground state according to requirements, and the surface roughness Ra ≤3.2μm.
- Flexible Customization: It can be delivered in fixed lengths of 6-12m, or processed into stepped shaft blanks according to the customer's drawings to reduce the subsequent machining allowance.
- Stable Supply: The regular inventory covers various specifications from Φ20 to Φ300mm, meeting the rapid delivery requirements for small and medium batches.
Application scenarios: Widely used in heavy-duty gear shafts of mining machinery, ship transmission shafts, oil drilling tools, slewing bearings of construction machinery, gears of wind power speed increasers and other heavy-duty and high-reliability transmission components. Practical cases have proved that the service life of shaft parts made of 40CrMnMoA is more than 30% longer than that of 40Cr; the contact fatigue strength of carburized gears made of 20CrMnMoA is significantly better than that of 20CrMnTi.
Trust endorsement and consultation advice: Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always adhered to the business policy of "seeking truth from facts and honesty as the foundation", and has provided a large number of high-quality special steel materials for industries such as petroleum, chemical industry, shipbuilding, mining, and textile machinery, and enjoys a high reputation among customers. The company has a professional material technology team, which can provide technical support such as material selection and heat treatment process suggestions. We understand the uniqueness of each working condition. We suggest that you provide specific load, size and usage environment before placing an order so that we can recommend the most suitable grade and delivery state. Welcome to contact us by phone or online to obtain detailed technical parameters and samples. We look forward to establishing a long-term and stable cooperative relationship with you.
FAQ:
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Q: How to choose between 40CrMnMoA and 20CrMnMoA in the application of heavy-duty gear shafts?
A: 40CrMnMoA has a higher carbon content and can be directly used as the shaft body after quenching and tempering, which is suitable for manufacturing gear shafts with integral quenching or quenching and tempering; 20CrMnMoA has a low carbon content and is often used for carburizing and quenching. While obtaining high hardness on the surface, it maintains good toughness in the core, which is more suitable for heavy-duty and high-impact carburized gear shafts. The selection needs to be based on the specific gear module, load type and hardness requirements. -
Q: What are the delivery states of round steel? Is subsequent heat treatment required?
A: The conventional supply is in the hot-rolled state (black skin), and annealing, normalizing or quenching and tempering treatment can also be provided as required. If it is used for precision parts, it is recommended to purchase in the quenched and tempered state, which can be directly processed after arrival; if the process includes carburizing, the hot-rolled or annealed state is more convenient for subsequent carburizing and heating. -
Q: What is the dimensional tolerance of round steel? Is there any control over surface defects?
A: The diameter tolerance of hot-rolled round steel is implemented according to the GB/T 702 standard, and the commonly used accuracy is Group 1 (±0.4~±0.5mm); the diameter tolerance of the turned or ground state can be controlled at ±0.05mm. All products are subjected to eddy current or ultrasonic flaw detection before leaving the factory, and there shall be no cracks, folds, scabs and other defects on the surface. -
Q: Can your company provide small batch trial materials? What is the minimum order quantity?
Answer: Small batch samples are supported. Orders can be placed for a single piece (specifically depending on the specification inventory. Generally, for those below Φ50mm, 1 - 2 meters can be supplied). The minimum order quantity for batch orders is 1 ton. Negotiation is possible for commonly stocked specifications. -
Question: Which foreign grades does 40CrMnMoA correspond to? Can it replace 40CrNiMoA?
Answer: 40CrMnMoA is close to the American standard AISI 4140 (but with a slightly lower Mo content) or the German DIN 40CrMnMoS 8. It can replace 40CrNiMoA under certain working conditions (such as when ultra - high impact toughness is not required), but the matching of mechanical properties needs to be rechecked. Our company (Liaocheng Jincheng Yangming Special Steel Co., Ltd.) can provide a specific performance comparison table. -
Question: Does the product come with a material certificate and a third - party inspection report?
Answer: A material certificate (chemical composition, mechanical properties) complying with GB/T 3077 is provided with the goods. According to customer requirements, a third - party authoritative institution (such as SGS, CEPREI) can be commissioned for re - inspection and a report can be issued. The cost is to be calculated separately. -
Question: How is the machinability of the round steel? Are special tools required?
Answer: After quenching and tempering, the hardness of 40CrMnMoA is about HB 280 - 320, and it can be smoothly machined with carbide tools; the hardness of 20CrMnMoA in the normalized state is relatively low, and its machinability is good. It is recommended to choose high - speed steel containing Co or coated inserts and adopt reasonable cutting parameters (refer to our company's recommended table).
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