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Help Center35crni3wa Alloy Round Steel for Mine Drilling Equipment, Highly Wear-resistant 35crni3mov Round Bar, Sufficient Steel Ingots
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35CrNi3WA Alloy Round Steel for Mining Drilling Equipment, High Wear-resistant 35CrNi3MoV Round Bar, Sufficient Steel Ingot
In operations such as mining, tunnel excavation, and geological exploration, drilling equipment is subject to high impact, high wear, and complex alternating stresses for a long time. Components such as drill pipes, impactors, and drill bits made of ordinary carbon steel or low-alloy steel often have problems such as insufficient hardness, poor wear resistance, and easy fatigue fracture, resulting in frequent equipment shutdowns for maintenance, which seriously affects mining efficiency and operating costs. In response to this core pain point in the industry, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has launched 35CrNi3WA alloy round steel and 35CrNi3MoV round bar based on its many years of experience in special steel R & D and production. By precisely controlling the alloy composition (Cr, Ni, W, Mo, V, etc.) and optimizing the smelting, forging, and heat treatment processes, the hardenability, tempering stability, and wear resistance of the steel have been significantly improved. While ensuring high hardness, the product also has good impact toughness, which can effectively extend the service life of drilling tools and reduce the comprehensive operation and maintenance costs of mining enterprises. Since its establishment, the company has always adhered to the principles of seeking truth from facts and honesty, and has accumulated a good reputation in the industry. Its products are widely used in fields such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery, and customers have reported that they are stable and reliable.
Working Mechanism and Alloy Principle
- Synergistic Effect of Alloying Elements: Cr and Ni greatly improve the hardenability of the steel, ensuring that the core of the large-section round steel can also obtain a uniform martensite structure; W, Mo, and V form high-hardness carbides, which improve wear resistance and refine grains, preventing softening during high-temperature tempering.
- Pure Steel Smelting Process: The electric arc furnace + ladle furnace refining (LF) + vacuum degassing (VD) process is used to strictly control the content of sulfur, phosphorus, gases, and non-metallic inclusions, ensuring the purity of the steel from the source.
- Forging and Heat Treatment: The as-cast structure is broken through multi-directional forging, and then quenching and tempering treatment (quenching + high-temperature tempering) is carried out to enable the product to obtain a fine tempered sorbite or troostite structure, achieving the best balance between hardness and toughness.
Product Features and Advantages
- High Wear Resistance: By adding high-carbide-forming elements such as W, Mo, and V, the surface hardness can reach HRC 42~48 (after heat treatment), and the wear resistance is 2~3 times higher than that of ordinary 40Cr.
- Excellent impact resistance: By optimizing the Ni content (2.5%~3.0%), the low-temperature impact toughness (Akv≥40J) is ensured, effectively resisting the repeated impacts of the drilling tool during hard rock crushing.
- Microstructure uniformity: The steel ingots are rolled/forged with a large reduction ratio, and internal defects such as porosity and segregation are fully improved. Ultrasonic flaw detection can meet the Class B standard of GB/T 4162-2008.
- Dimension accuracy control: The outer diameter tolerance of the round steel can be controlled within ±0.5mm, with excellent surface finish. It can be directly used for machining, reducing material waste.
- Adequate steel ingot reserves: Hundreds of tons of 35CrNi3WA/35CrNi3MoV steel ingots and forged billets are always in stock. The delivery time is fast, and large-tonnage orders and customized products of special dimensions can be accepted.
| Typical chemical composition (%) | C: 0.30~0.40 | Si: 0.17~0.37 | Mn: 0.30~0.60 |
| Cr: 0.90~1.30 | Ni: 2.50~3.00 | W: 0.50~0.80 | |
| 35CrNi3MoV contains Mo/V | Mo: 0.20~0.40 | V: 0.05~0.15 | P≤0.025, S≤0.025 |
| Technical parameters (round steel) | Tensile strength Rm: ≥980 MPa | Yield strength Rel: ≥835 MPa |
| Elongation A: ≥12% | Reduction of area Z: ≥40% | |
| Impact energy Akv (20°C) | ≥40 J | Hardness (quenched and tempered) HRC 42~48 |
Company Advantages and Trust Endorsement
Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng City, Shandong Province. It is an enterprise deeply engaged in the wholesale industry of special steel. It mainly produces and operates precipitation hardening steel, duplex steel, heat-resistant steel, heat-resistant alloys, corrosion-resistant alloys, austenitic steel, martensitic steel and other special steels. 35CrNi3WA/35CrNi3MoV round steel for mining drill tools is one of our advantageous products. The company's production workshop is equipped with a complete production line including electric arc furnaces, LF refining furnaces, VD vacuum degassing devices, rapid forging presses, heat treatment furnaces, etc., and has testing equipment such as ultrasonic flaw detection, mechanical tests, and spectral analysis to ensure that each batch of products is traceable and verifiable. Since its establishment, we have adhered to the business philosophy of "seeking truth from facts and honesty as the foundation". Our products have been exported to many countries and are widely recognized in the mining machinery field. For example, a large mining group has purchased 35CrNi3WA round steel in bulk for two consecutive years to manufacture impact drill bits. After comparing with the use of high-manganese steel, the average service life of the drill bits has been increased by more than 30%. In addition, the company's warehouse always maintains a sufficient inventory of steel ingots, which can quickly respond to emergency orders and provide customers with free consultation on material performance and processing suggestions.
Consultation Suggestions
If you are looking for an alloy round steel with high wear resistance, high impact resistance and excellent cost performance for the manufacture of mining drill tools, it is recommended that you communicate with us according to the actual working conditions (such as rock hardness, impact frequency, size requirements, etc.). Our technical team can assist you in selecting the most suitable grade (35CrNi3WA or 35CrNi3MoV) and heat treatment process, and provide sample testing services. Welcome to contact Liaocheng Jincheng Yangming Special Steel Co., Ltd. We are willing to use our professional capabilities and honest services to help you upgrade your equipment.
FAQ (Frequently Asked Questions)
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Q: What are the core differences between 35CrNi3WA and 35CrNi3MoV?
A: 35CrNi3MoV adds Mo and V on the basis of 35CrNi3WA. Mo can further improve the high-temperature strength and resistance to temper softening, and V can form VC fine carbides to refine grains and increase wear resistance. Therefore, 35CrNi3MoV is more suitable for use under higher temperature or heavier load conditions, while 35CrNi3WA has good comprehensive toughness and higher cost performance. -
Q: Can this round steel be used for down-the-hole drill tools with high-frequency impact?
A: Absolutely. Through reasonable quenching and tempering treatment, the microstructure is tempered sorbite. Combined with the dispersed carbides formed by W, Mo, and V, it can effectively resist surface spalling and fatigue cracks under high-frequency impact. This steel has been successfully applied to components such as impactor pistons and drill bit splines by several drilling tool manufacturers supplied by Liaocheng Jincheng Yangming Special Steel Co., Ltd. -
Q: What is the recommended heat treatment process?
A: Generally, the recommended quenching temperature is 860~880°C (oil quenching), and the tempering temperature is 560~620°C (high-temperature tempering). The specific parameters need to be fine-tuned according to the part size, hardness requirements, and original microstructure. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide reference process cards. -
Q: What is the delivery state of the round steel?
A: The default delivery state is annealed or hot-rolled (forged) state. The surface can be turned or in black skin. If you need the round steel to be delivered after quenching and tempering, please inform us in advance. We can perform heat treatment according to your requirements and test the performance. -
Q: How is the dimensional tolerance of the round steel controlled?
A: The diameter tolerance of the conventional turned round steel can be controlled within ±0.5mm. The tolerance of the black skin round steel is in accordance with the GB/T 702-2017 standard. For high-precision requirements, we can provide grinding or precision turning processing, and the tolerance can reach h9 level. -
Q: How do you ensure the internal quality of the steel ingot?
A: The steel ingot is cast by bottom pouring or protective casting to reduce secondary oxidation, and then fully compacted by multi-directional forging. During mass production, the chemical composition of each furnace is rechecked, and an ultrasonic flaw detection report (in accordance with the GB/T 4162-2008 Class B standard) can be provided for each round steel to ensure that there are no defects such as cracks and shrinkage cavities. -
Q: Can your company provide small batches of trial materials?
A: Yes. We understand that customers need to conduct process verification during the material selection stage. Therefore, we can provide several small-sized round steel samples (for example, with a diameter of 50mm and a length of 200mm), and only charge the material cost. We will also provide the material certificate for customers' comparative testing.
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