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Help CenterHigh-strength 40crni2si2mova Round Steel Forgings, 40crni2si2mov Round Bars With Diameters Ranging From 14 to 400 Are Available
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Industry Pain Points and Solutions
In the fields of high-end mechanical manufacturing and components for special working conditions, traditional low-alloy steels or ordinary quenched and tempered steels often suffer from problems such as early fracture and short fatigue life due to insufficient strength and imbalanced toughness matching. Especially in scenarios such as aerospace landing gears, key shafts of heavy mining machinery, and high-load molds, material failure directly leads to equipment shutdown, high maintenance costs, and even safety accidents. Conventional 40Cr or 42CrMo can no longer meet the strict requirements of modern high-safety factor designs for the comprehensive mechanical properties of materials. To address this pain point, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has launched high-strength 40CrNi2Si2MoVA round steel, forgings, and round bars into the market based on its years of accumulation in the special steel field. This material belongs to ultra-high-strength alloy structural steel. By precisely controlling the proportions of elements such as Ni, Cr, Si, Mo, and V and combining them with corresponding heat treatment processes, the tensile strength and toughness matching can be significantly improved, effectively resolving the contradiction between insufficient strength and excessive brittleness of traditional steels. The company is located in Liaocheng, Shandong, and specializes in the wholesale and customized processing of special steel. Adhering to the principle of seeking truth from facts, it ensures the stability of the chemical composition and mechanical properties of each batch of materials, providing a reliable material basis for customers' key components.
Working Mechanism and Product Features
The strengthening mechanism of 40CrNi2Si2MoVA round steel is mainly based on solid solution strengthening, fine-grain strengthening, and carbide dispersion strengthening:
• Composition Design: The reasonable proportions of nickel, chromium, silicon, molybdenum, and vanadium form uniform and fine tempered martensite and dispersed carbides after quenching and tempering, endowing the material with ultra-high strength and good toughness.
• Heat Treatment Process: The conventional recommended quenching temperature is 860 - 900℃, with oil quenching or air quenching, followed by low-temperature tempering (200 - 300℃) to obtain high strength. Isothermal quenching or quenching and tempering treatment can also be carried out according to customer requirements to adjust the balance between hardness and toughness.
• Complete Product Specifications: It can be supplied in diameters ranging from 14mm to 400mm, covering three forms: round steel, forgings, and round bars, meeting the different machining allowance requirements from small-sized shafts to large-sized forging billets.
• Processing Adaptability: It can provide various surface conditions such as black skin, polished, and turned, and supports delivery after rough machining and semi-finishing, reducing the subsequent machining time for customers.
Technical Specifications and Advantages
The products strictly follow the industry's general material standards (such as GB/T 3077, GJB, etc.), and the measured performance uniformity is excellent. The following table shows the reference mechanical properties under typical specifications (longitudinal sampling):
| Parameter Items | Typical Values | Remarks |
|---|---|---|
| Tensile strength Rm (MPa) | ≥1860 | After heat treatment |
| Yield strength Rp0.2 (MPa) | ≥1517 | After heat treatment |
| Elongation after fracture A (%) | ≥10 | Longitudinal |
| Reduction of area Z (%) | ≥35 | Longitudinal |
| Impact absorption energy KU2 (J) | ≥30 | Longitudinal at room temperature |
| Hardness (HRC) | 45-52 | Adjusted according to tempering temperature |
Compared with ordinary 40Cr steel, this material has about 30% - 40% higher tensile strength under the same hardness, lower notch sensitivity, and significantly extended fatigue life. These advantages have been verified in many practical application cases. In addition, the good hardenability of the material enables a large bar with a diameter of 400mm to still obtain a uniform hardened layer, ensuring the stable mechanical properties of the core of large forgings.
Trust Endorsement and Company Advantages
Liaocheng Jincheng Yangming Special Steel Co., Ltd. has long been supplying special steels such as precipitation hardening steel, duplex steel, heat-resistant steel, and corrosion-resistant alloys. Its products are widely used in industries such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, mining, textile, and construction machinery. The company always adheres to the business principle of seeking truth from facts and honesty, and has accumulated a good reputation in the industry. Each batch of 40CrNi2Si2MoVA round steel we provide comes with a material certificate and a traceable production batch number, and the chemical composition and mechanical property data are truly verifiable. For customers who need stable supply and strict quality management, we can cooperate with third - party inspections (such as SGS, BV, etc.). We suggest that you provide specific operating conditions (such as load type, working temperature, safety factor requirements, etc.) before placing an order so that our technical team can provide targeted heat treatment process recommendations or size allowance suggestions. We are willing to communicate with you in depth to jointly optimize the material selection plan rather than simply engaging in price competition. If you have any needs, please feel free to call or leave a message to get a more detailed parameter report and quotation.
FAQ
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Q: What's the difference between 40CrNi2Si2MoVA and the common 40CrNiMoA?
A: The main difference lies in the addition of silicon (Si) and vanadium (V). Silicon can improve tempering stability and strength, while vanadium can refine grains and enhance toughness. Under the same heat treatment conditions, the tensile strength of 40CrNi2Si2MoVA is usually about 150 - 200 MPa higher than that of 40CrNiMoA, making it suitable for scenarios with higher fatigue loads. -
Q: Can the round steel with a diameter of 400mm guarantee the mechanical properties at the core?
A: Yes. Thanks to the reasonable proportion of Ni, Cr, and Mo elements, this material has excellent hardenability. After oil quenching or air quenching of large-diameter bars, the core can still obtain a martensite structure. After tempering, the hardness difference between the core and the surface is controlled within HRC 3 - 5, meeting the requirements for the hardenability of large cross-sections in GB/T 3077. -
Q: Is this material suitable for low-temperature environments?
A: After appropriate heat treatment (such as low-temperature tempering + tempering to improve toughness), this material can still maintain high impact toughness (KU2 ≥ 20J) at -40°C. However, if the operating temperature is lower than -70°C, it is recommended to consider nickel-based alloys with better low-temperature toughness. -
Q: What surface conditions of the round steel do you offer?
A: We can offer three surface conditions: black skin (hot-rolled state), ground (surface turning or grinding), and turned (rough-turned to the specified size). The default is black skin. If peeling processing is required, please communicate in advance. The machining allowance is about 3 - 5mm on one side. -
Q: Can you provide heat treatment services?
A: Liaocheng Jincheng Yangming Special Steel Co., Ltd. can pre-harden the raw materials according to the customer's requirements (deliver in the quenched and tempered state), and can also provide finished bars after quenching + tempering processes. Please note that the final heat treatment parameters need to be determined in detail according to the workpiece size and working conditions. It is recommended to provide the drawings or usage conditions and jointly formulate the process. -
Q: What is the minimum order quantity?
A: For the common specifications with a diameter of 14 - 100mm, the minimum order quantity is 1 ton. For large specifications or custom forgings, the minimum order quantity is negotiated according to the specific size, and the basic delivery quantity starts from 500kg. Sample orders can be provided in small quantities (such as a single 1-meter bar), but the cutting and logistics costs need to be borne. -
Q: Do you have relevant quality certifications?
A: Liaocheng Jincheng Yangming Special Steel Co., Ltd. adheres to the general industry quality management system in the production process and can provide material certificates, chemical composition analysis reports, and mechanical property reports according to the customer's requirements. For customers with system certification requirements, we can cooperate with third-party testing institutions to issue test reports, but the company does not currently hold certifications such as ISO 9001 (due to the nature of the enterprise as a wholesaler and flexible cooperation according to customer requirements).
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