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Help CenterJinchengyangming Fatigue-resistant 35crmova Round Steel, High-toughness 35crmov Alloy Steel Bar, Sold by One Piece. Interrupted
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Industry Pain Points and Solutions
In the core components of heavy machinery, oil drilling, mining equipment, etc., parts such as shafts, gears, and connecting rods that bear alternating loads and impacts for a long time, the most prominent failure mode is fatigue fracture. Although traditional ordinary alloy steels (such as 40Cr, 42CrMo) have acceptable strength, they are prone to initiate microcracks under high-stress cycles and have insufficient toughness reserves. Once encountering sudden overload or low-temperature environment, the risk of brittle fracture increases sharply. Such accidents may cause equipment downtime for maintenance at worst, or even lead to serious safety accidents. The industry urgently needs a special steel grade that combines high fatigue limit, high impact toughness and good hardenability to replace conventional materials.
Liaocheng Jincheng Yangming Special Steel Co., Ltd. has been deeply involved in the special steel field for many years. In response to the above pain points, it has mainly launched 35CrMoVA anti-fatigue round steel. This steel grade adds vanadium (V) element on the basis of traditional 35CrMo. Through grain refinement and precipitation strengthening, the anti-fatigue performance of the material is improved by more than 30%, while maintaining excellent toughness. Relying on the advanced electric furnace smelting + out-of-furnace refining + electroslag remelting process, the company strictly controls the content of harmful elements and gases to ensure that the steel is dense inside and has a uniform structure. From raw materials to finished products, multiple non-destructive tests are carried out, and each round steel can be traced. In line with the principle of "seeking truth from facts and honesty as the foundation", we provide flexible services of selling from one piece, enabling small and medium-sized users to use high-quality special steel.
Detailed Product Description
I. Working Mechanism and Performance Characteristics
- Mechanism of Improving Fatigue Resistance: Vanadium (V) forms fine and dispersed carbonitrides in steel, which can effectively pin grain boundaries after quenching + tempering and inhibit the initiation and propagation of fatigue cracks. At the same time, the addition of vanadium increases the stability of supercooled austenite in steel and improves the hardenability. The core of large-section parts can also obtain a uniform sorbite structure.
- High Toughness Matching: Through optimizing the quenching and tempering process (quenching temperature 860-880℃, tempering temperature 560-650℃), mechanical properties with a tensile strength of 980-1180MPa, a yield strength of ≥835MPa, and an impact energy (KV₂) of ≥63J can be obtained. It still maintains good toughness at low temperatures (-20℃), meeting the needs of outdoor equipment in northern winter.
- Cutting and Hot Working Performance: The hardness of this steel is moderate in the annealed state (HB 220-280), and the machining efficiency of turning, drilling, etc. is high; preheating (300-400℃) is required during forging and welding, and slow cooling after welding is necessary to avoid the generation of hydrogen-induced cracks.
2. Typical technical specifications (refer to standard GB/T 3077)
| Parameter item | Typical value | Remarks |
|---|---|---|
| Chemical composition C | 0.30～0.38% | Control carbon equivalent |
| Chemical composition Si | 0.17～0.37% | - |
| Chemical composition Mn | 0.40～0.70% | - |
| Chemical composition Cr | 0.90～1.20% | Improve hardenability |
| Chemical composition Mo | 0.15～0.25% | Refine grains and inhibit temper brittleness |
| Chemical composition V | 0.10～0.20% | Core anti-fatigue element |
| Tensile strength Rm | 980～1180 MPa | Quenched and tempered state |
| Yield strength ReL | ≥835 MPa | - |
| Impact absorption energy KV₂ | ≥63 J | Longitudinal at room temperature |
| Hardness HB | 285～341 | After quenching and tempering |
| Delivery state | Annealed or quenched and tempered | Customizable on demand |
III. Summary of Product Advantages
- Long Fatigue Life: Compared with ordinary 35CrMo, the fatigue life is increased by more than 30% under the same stress ratio, effectively extending the parts replacement cycle.
- Excellent Toughness: The impact energy value is stable ≥63J, especially suitable for impact loads and low-temperature environments.
- Flexible Specifications: Round steel with a diameter of Φ20 - 300mm is always in stock. Special-shaped cross-sections can also be customized. The length is 1 - 12 meters, and single pieces are sold, meeting the urgent small-batch requirements.
- Controllable Quality: Each batch comes with a material test report. Third-party testing is supported, and the chemical composition and mechanical properties are traceable.
- Fast Delivery: There is sufficient inventory of regular specifications, and the goods can be delivered within 48 hours after placing an order. The delivery time for special specifications can be negotiated.
IV. Trust Endorsement and Consultation Advice
Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always put product quality and customer service first. The company is equipped with testing equipment such as direct-reading spectrometers, universal testing machines, impact testing machines, hardness testers, and ultrasonic flaw detectors, and each piece is inspected before leaving the factory. We supply materials for core components such as oil drill pipe joints, mining picks, ship drive shafts, and chemical pump shafts, and have won the praise of many customers. The company does not exaggerate its publicity, but can promise that all products are 100% guaranteed in terms of material and performance. If quality problems are found, they will be returned or exchanged.
If you are troubled by the fatigue failure or insufficient toughness of parts, it is recommended that you first evaluate the design stress and operating conditions, and then communicate with our technical team. We will recommend the most suitable heat treatment process and specifications for you. We provide a free sample testing service, and you can first test the performance by cutting samples. Welcome to call or visit our factory. We will provide technical support and quotations according to your specific needs.
Frequently Asked Questions
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Q: Compared with 35CrMo, how much higher is the cost of 35CrMoVA? What is its cost-effectiveness?
Answer: Due to the addition of vanadium and the adoption of refining process, the comprehensive cost of 35CrMoVA is about 8-12% higher than that of 35CrMo. However, considering that its fatigue resistance is improved by more than 30%, when calculated according to the full life cycle of the parts (reduced replacement frequency and less downtime losses), the overall economy is better, especially suitable for high-end heavy-load working conditions. -
Question: Is this round steel suitable for welded structures? What should be noted during welding?
Answer: The weldability of 35CrMoVA is average. Due to its relatively high carbon equivalent (about 0.7%), it is recommended to use preheating (300-400℃), control the interpass temperature, immediately conduct dehydrogenation treatment after welding (keep at 250℃ for 2h) and slow cooling. It is best to consult the technical department first to evaluate the weld form. -
Question: Can you provide finished products after quenching and tempering treatment? Or can you only provide black bars?
Answer: We can provide various delivery states such as annealing, quenching and tempering, rough turning or polishing according to customer requirements. For quenching and tempering treatment, the hardness or mechanical property range needs to be specified, and we can provide supporting heat treatment services. -
Question: I only need a short piece of material with a diameter of 100mm and a length of 300mm. Can I place an order?
Answer: Absolutely. We support retail sales by cutting, starting from one piece, and pricing according to the actual weight. The length can be precisely cut with a tolerance of ±2mm. -
Question: Can this material be used to manufacture high-strength bolts? How is its fatigue performance?
Answer: Yes. 35CrMoVA is commonly used to manufacture high-strength bolts of grade 10.9 and above, especially suitable for connection parts subject to alternating tensile stress. After optimized heat treatment, its fatigue life under the specified pre-tightening force is better than that of 42CrMo. -
Question: What non-destructive testing methods do you have?
Answer: We are equipped with ultrasonic flaw detectors and magnetic particle flaw detectors, which can detect the inside and surface of the round steel to meet the acceptance criteria of GB/T 4162 Grade B or C. Customers can specify the flaw detection grade. -
Question: Do you have in-stock products? Can you provide material reports?
Answer: Conventional specifications such as Φ30-φ150mm are always in stock, accompanied by the original material reports (chemical composition, mechanical properties). Special specifications need to be scheduled for production, and the delivery time is generally 7-15 days. -
Question: Is the toughness of this material sufficient for use in a low-temperature environment of -40℃?
Answer: After quenching and tempering, 35CrMoVA can maintain an impact energy of more than 42J (longitudinal) at -40℃, which is better than most quenched and tempered alloy steels. However, if the operating temperature is lower than -50℃, it is recommended to use materials with a lower ductile-brittle transition temperature such as Ni-based steels.
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