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Help Centerin Stock, 42crmo4 Round Steel Cut to Order, 42crmo4v Alloy Steel Forging Round Bars, qt Quenched and Tempered, Polished, Guaranteed Material Quality
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In the fields of heavy - duty machinery, petrochemical industry and mining equipment manufacturing, the core transmission components and structural parts have long been facing severe working conditions of high stress, high impact and wear. Traditional ordinary carbon steels or low - alloy steels are prone to early fatigue fracture and deformation failure due to insufficient strength, poor toughness and low hardenability, resulting in high costs for equipment shutdown and maintenance. Especially for large forgings and long - shaft parts, the material uniformity and heat - treatment consistency have been long - standing pain points in the industry. Liaocheng Jincheng Yangming Special Steel Co., Ltd., with years of experience in special steel production, has specifically launched the On - spot 42CrMo4 round steel cut to length, 42CrMo4V alloy steel forged round bars + QT quenching and tempering and polishing products. This product uses high - quality alloy steel billets. By strictly controlling the smelting composition, forging ratio and heat - treatment process, the comprehensive mechanical properties of the material are significantly improved, effectively meeting the customers' combined requirements for high toughness, high strength and high surface quality. The company is located in Liaocheng, Shandong. Adhering to the philosophy of "seeking truth from facts and being honest - oriented", it ensures that each batch of products is traceable and the material is stable.
This product adopts the process of electric furnace primary smelting + ladle refining (LF) + vacuum degassing (VD), which reduces the gas and inclusion content in the steel from the source and improves the purity. Then, it is forged and billeted through multiple heating times to ensure the reasonable density of the core and the flow direction of the fibrous structure and avoid forging cracks. Finally, through QT quenching and tempering (quenching + high - temperature tempering), a tempered sorbite structure is obtained, achieving a good match between strength and toughness. The surface is polished, with the dimensional tolerance reaching grade h9 and the surface roughness Ra ≤ 1.6μm. It can be directly used for precision machining or assembly, reducing the subsequent machining allowance for customers. It supports cutting to any length and provides forging customization services to meet the needs of non - standard parts.
- Product working mechanism: 42CrMo4 belongs to medium - carbon alloy structural steel. The main added elements Cr and Mo improve the hardenability and tempering stability, and the V element (42CrMo4V) refines the grains and improves the high - temperature strength. After forging the raw materials, the grains are refined and the structure is dense. During the quenching and tempering process, it is heated to 860 - 880℃ for austenitization, oil - quenched to obtain martensite, and then tempered at a high temperature of 560 - 620℃ to obtain a stable tempered sorbite structure, with the tensile strength reaching 900 - 1100MPa, the yield strength ≥ 700MPa, the elongation after fracture ≥ 14%, and the impact energy (-20℃) ≥ 40J. The polishing process uses a centerless grinder for precision grinding, with high outer - circle accuracy and good straightness.
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Core product features:
- Authentic material: Each heat comes with a spectral analysis report and mechanical property test data. The chemical composition of the material strictly complies with the DIN EN 10083 - 3 standard.
- Flexible cutting: Supports single or batch cutting. The length accuracy is ±2mm, and there is no minimum order quantity, reducing the customer's inventory pressure.
- Forging customization: Can provide forgings such as stepped shafts, flange shafts, and gear blanks, and perform rough or fine machining according to the drawings.
- Uniform quenching and tempering: Adopts the linkage control of a trolley-type resistance furnace and a quenching oil tank, combined with tooling design, to ensure that the difference between the core hardness and the surface layer of large-section workpieces is ≤3HRC.
- Surface quality: The surface of the polished bar has no decarburized layer, no cracks, and no rust, and can be directly used for high-speed rotation or sealing fit.
| Typical chemical composition (%) | C:0.38-0.45, Si:≤0.40, Mn:0.60-0.90, P≤0.025, S≤0.025, Cr:0.90-1.20, Mo:0.15-0.30 |
| Mechanical properties (quenched and tempered state) | Tensile strength 900-1100MPa, yield strength ≥700MPa, elongation ≥14%, reduction of area ≥50%, impact energy AKU ≥40J (-20℃) |
| Size range | Round steel diameter φ20-300mm, forging cross-section size ≤500mm (negotiable) |
| Surface roughness | Polished state Ra≤1.6μm |
| Processing length | Cutting length 100-6000mm, fixed-length accuracy ±2mm |
In practical applications, this product has successfully served many heavy machinery enterprises and is used to manufacture gear shafts, connecting rods, bolts, and high-pressure vessel flanges. Customer feedback: After using this product, the heat treatment deformation rate of parts is reduced by 30%, and the fatigue life is increased by more than 25%. The company is equipped with a WE-600 universal material testing machine, an impact testing machine, a Brinell-Vickers hardness tester, and a metallographic microscope. All products leaving the factory are strictly inspected to ensure that the mechanical properties and metallographic structure are qualified. For bulk orders, third-party inspection reports (such as SGS, BV) can be provided to further guarantee the quality. The company's inventory always has more than 200 tons of round steel of various specifications and can quickly respond to urgent orders. We recommend that customers clarify the operating conditions (temperature, load, medium) when selecting materials so that the technical team can provide the most suitable heat treatment process and processing plan.
FAQ (Frequently Asked Questions)
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Q: What's the difference between 42CrMo4 and 42CrMo4V?
A: 42CrMo4V is developed on the basis of 42CrMo4 by adding a small amount of vanadium (V ≤ 0.10%). Vanadium can refine grains, inhibit temper brittleness, and improve the normal and high-temperature strength of the steel. 42CrMo4V is more suitable for use in higher temperature or impact environments. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide both materials. You can choose according to the working temperature of your parts. -
Q: Is there a big price difference between the quenched and tempered state and the non-quenched and tempered state?
A: Quenching and tempering treatment requires additional quenching and tempering processes, which consume energy and working hours. Therefore, the unit price will be about 15 - 20% higher than that of the black skin or annealed state. However, high strength and toughness can be directly obtained after quenching and tempering, which saves the customer's subsequent heat treatment costs. The comprehensive cost is actually lower, and the risk of subsequent heat treatment deformation is avoided. -
Q: Can the polished bar guarantee no internal defects?
A: We use ultrasonic flaw detection to test each round steel (GB/T 4162 Class B or Class C standards can be implemented according to requirements), and single defects with a diameter ≥ 1mm can be detected. A flaw detection report will be issued before delivery to ensure reliable internal quality. In addition, the raw materials are vacuum degassed, with low gas content, and the incidence of white spots and hairline cracks is extremely low. -
Q: How to control the tolerance of the length for cutting to length?
A: We use CNC sawing machines and gas cutting equipment, and the cutting section is flat. The length tolerance is generally controlled within ±2mm. If a more stringent tolerance (such as ±0.5mm) is required, end face finishing can be carried out, but additional costs will be incurred. -
Q: For large-diameter round steel (>300mm), can the core performance be guaranteed?
A: For round steel with a diameter exceeding 300mm, we usually recommend using forgings. The center porosity can be improved through multiple upsetting and drawing forging, and the quenching and tempering process (such as water quenching and oil cooling) can be optimized. Before actual supply, we will provide a simulated performance prediction report to ensure that the core hardness is not less than 85% of the surface hardness. -
Q: Is the material suitable for low-temperature environments below -40℃?
A: Through reasonable alloying and quenching and tempering treatment, the KV2 impact energy of 42CrMo4 at -40℃ is usually ≥ 27J (can be guaranteed by agreement). Due to the grain refinement of vanadium, 42CrMo4V has better low-temperature toughness. If you have special low-temperature requirements, you can choose an improved grade containing Ni or perform secondary tempering treatment. -
Q: How to ensure the consistency of the material for each batch?
A: We have established a strict batch management system, providing a unique batch number from steelmaking to the finished product. Samples of each batch furnace number are retained, and a material quality assurance certificate (including data such as chemical composition, mechanical properties, and hardness) is attached when shipping. For long-term cooperative customers, we can provide third-party sampling comparison services twice a year. -
Q: Does your company support small-batch sampling?
A: Absolutely. We always have round steel in various specifications in stock. The minimum cutting length can be as short as 100mm, with no limit on the quantity. Just provide the required size, state, and quantity, and we will quickly provide a quote and arrange production to help customers complete the preliminary verification.
If you have any questions about the products or need customized parameters, please feel free to contact our technical team through the official website or phone. We will recommend the most suitable material, heat treatment process, and processing plan based on your specific drawings, working conditions, and usage requirements. Liaocheng Jincheng Yangming Special Steel Co., Ltd. is willing to become your long-term cooperative material supplier with professional services and reliable quality.
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