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Help CenterXianggang 30crmoa Alloy Steel, High Hardenability 30crmoa Round Steel, Cut to Length From 16 to 300, Packed, Guaranteed Material Quality
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Industry Pain Points and Solutions
In the fields of mechanical manufacturing and heavy equipment, the heat treatment stability and hardenability of alloy structural steels have always been the core pain points in the industry. Traditional steels often fail to meet the hardness requirements at the core of workpieces due to insufficient hardening depth, resulting in problems such as deformation, cracking, and uneven performance, which seriously affect the service life and reliability of key components such as gears, shafts, and connecting rods. At the same time, large dimensional tolerances, inflexible fixed lengths, and opaque material certificates of round steel in the procurement process also cause great material waste and quality risks for downstream processing enterprises.
Liaocheng Jincheng Yangming Special Steel Co., Ltd., based in Liaocheng, Shandong, has been deeply involved in the wholesale of special steels for more than a decade. Relying on high - quality raw materials from Xiangtan Iron and Steel Co., Ltd., it specializes in supplying 30CrMoA alloy steel round bars. By adding chromium and molybdenum elements and optimizing the smelting process, the hardenability and tempering stability of this grade of steel are significantly improved. Coupled with the services of fixed - length cutting and packaging, it fundamentally meets the customers' dual requirements for material stability and processing convenience.
Working Mechanism and Technical Features
- Optimized Chemical Composition: 30CrMoA is strictly controlled according to GB/T 3077 - 2015, with a carbon content of 0.27 - 0.34%, chromium 0.80 - 1.10%, and molybdenum 0.15 - 0.25%, ensuring a hardenability J9 (hardness at a distance of 9mm from the end - quenched end) ≥ HRC 40, far exceeding that of ordinary 30CrMo.
- Principle of High Hardenability: Molybdenum refines the grain structure and suppresses temper brittleness, while chromium increases the depth of the hardened layer, enabling the hardness difference between the inside and outside of a 100mm - diameter round bar after quenching and tempering to be controlled within HRC 3.
- Size and Fixed - Length Service: It offers a full range of specifications from Φ16 to Φ300mm, supports cutting to any fixed length, and controls the tolerance within ±2mm, reducing the subsequent machining allowance for customers.
- Material Quality Assurance Promise: Each batch comes with the original quality certificate from Xiangtan Iron and Steel Co., Ltd., with traceable furnace numbers and spectral analysis of the chemical composition, ensuring 100% compliance.
| Technical Parameters | Typical Values | Standard Ranges |
| Tensile Strength (Rm) | ≥930 MPa | ≥930 |
| Yield strength (Re) | ≥785 MPa | ≥785 |
| Elongation after fracture (A) | ≥12% | ≥12 |
| Impact energy (KU2) | ≥63 J | ≥63 |
| Hardenability J9 | HRC 41 - 44 | ≥HRC 38 |
Detailed explanation of product advantages
- High hardenability stability: Through precise micro - alloying and controlled rolling processes, the core of large - section round steel can also obtain a uniform martensite structure, which is suitable for parts such as heavy - load gears and drive shafts that require overall strengthening heat treatment.
- Flexible fixed - length cutting: It supports the cutting of blanks with any diameter from 16 - 300mm, and the length can be customized from 300mm to 6000mm, avoiding the waste of surplus materials caused by the conventional 6 - meter fixed length. It is especially suitable for production enterprises with small and medium - batch and multi - variety products.
- Convenient packing and shipping: It is packed with steel strips or bundled on pallets, and the surface is coated with anti - rust oil to ensure no rust and no bumps during long - distance transportation. The weight of a single package can be controlled between 2 - 5 tons, which is convenient for forklift loading and unloading.
- Material reliability: Starting from the source of Xianggang, each batch of round steel is marked with the furnace number, and spectral re - inspection is carried out before storage. If the composition or performance does not meet the standards, it can be returned or exchanged unconditionally, reducing the customer's procurement risk.
- Wide application scenarios: In addition to the traditional machinery industry, this material is also suitable for fields such as petrochemical valves, fasteners, and ship accessories. Its heat resistance and corrosion resistance are better than ordinary carbon steel.
Trust endorsement and consulting advice
Liaocheng Jincheng Yangming Special Steel Co., Ltd. is located in Liaocheng City, Shandong Province. It is a steel distribution enterprise mainly engaged in the wholesale industry. It has long - term experience in dealing with special steel types such as precipitation - hardening steel, duplex steel, heat - resistant steel, corrosion - resistant alloy, austenitic steel, and martensitic steel. Its products are widely used in industries such as petroleum, chemical, shipbuilding, nuclear engineering, aerospace, as well as mining, textile, and construction machinery. The company adheres to the business philosophy of "seeking truth from facts and honesty as the foundation" and has accumulated a good reputation in the industry. Its customers cover many precision processing enterprises in Shandong, Hebei, Jiangsu, and Zhejiang.
We are well aware that the procurement of alloy steel involves multiple processes such as material matching and heat treatment process verification. We recommend that you provide the workpiece dimensions, heat treatment requirements, and performance indicators before placing an order. Our technical team can assist in recommending the best specifications and fixed-length solutions, and arrange for rapid delivery based on the inventory. If you need sample testing or furnace front spectral reports, please feel free to contact us at any time. Choosing Liaocheng Jincheng Yangming Special Steel Co., Ltd. means choosing peace of mind and reliability.
FAQ
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Q: What's the difference between 30CrMoA and 30CrMo?
A: The "A" in 30CrMoA indicates high-quality steel. Its sulfur and phosphorus contents are respectively controlled at ≤0.025%, and it has undergone grain refinement treatment. It has better hardenability and low-temperature toughness, making it suitable for quenched and tempered parts with higher requirements. -
Q: What's the cutting accuracy of the round steel? Will the end face be skewed?
A: We use a band sawing machine for precise cutting. The perpendicularity of the end face can be controlled within 3°, and the length tolerance is ±2mm. It can be directly machined on the machine tool without secondary sawing. -
Q: Can your company provide material inspection reports?
A: Each batch of round steel comes with the original quality guarantee certificate from Xiangtan Iron and Steel Group Co., Ltd., which includes chemical composition, mechanical properties, and hardenability data. If the customer needs it, we can also entrust a third-party testing agency to issue a report. -
Q: What heat treatment process is suitable for 30CrMoA round steel?
A: Quenching and tempering treatment (quenching + high-temperature tempering) is commonly used. The quenching temperature is 860 - 880℃, and it is cooled in oil. The tempering temperature is 540 - 660℃. It can also be used for carburizing or nitriding, and the specific process needs to be adjusted according to the workpiece thickness. -
Q: Can small-diameter (e.g., 16mm) round steel be cut into short segments? What's the minimum length?
A: Yes, the minimum fixed-length is 50mm. However, if it's too short ( -
Q: Is the product packaging rust-proof? Will it rust during long-distance transportation?
A: It is conventionally packed, brushed with anti-rust oil, and wrapped with waterproof plastic sheeting. If it is transported to a humid area or needs to be stored for a long time, vapor-phase anti-rust paper can be additionally used for reinforcement to ensure no rusting within 6 months. -
Q: Are there any defects on the surface of the round steel, such as cracks or folds?
A: The round steel from Xiangtan Iron and Steel Group Co., Ltd. has undergone flaw detection, and our company conducts another visual sampling inspection before warehousing. If surface defects are found, it can be returned or exchanged. We promise that the surface quality meets the requirements of GB/T 3077 - 2015.
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