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Help CenterXingcheng Tl4227 Alloy Structural Round Steel, Skf3 Quenched and Tempered Alloy Round Bar for Automobiles, Quality Guaranteed, Delivered to Factory
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In the field of automobile manufacturing, key structural components such as steering knuckles, half shafts, and connecting rods have long been facing high-stress and high-fatigue working conditions. Traditional round steel often has problems such as inaccurate alloy ratio, uneven hardness after quenching and tempering, and serious surface decarburization, resulting in short service life of components and high risk of failure. Liaocheng Jincheng Yangming Special Steel Co., Ltd. deeply understands this pain point in the industry. In cooperation with Xingcheng Special Steel, it has launched TL4227 alloy structural round steel (SKF3 quenched and tempered alloy round bar for automobiles) to solve the problem of material performance stability from the source. We focus on the processing and trading of special steel and have the supply capacity of all categories such as precipitation hardening steel, duplex steel, and heat-resistant steel. Relying on the smelting technology of Xingcheng Special Steel, through strict composition control and optimization of the quenching and tempering process, the round steel achieves a balance between strength, toughness, and wear resistance, effectively reducing the subsequent heat treatment cost for customers and improving the yield rate.
The working mechanism of this product is based on the strengthening principle of alloy structural steel: The TL4227 grade corresponds to a specific alloy element ratio (such as Cr, Mo, Ni, etc.), and the purity and uniformity have been ensured during the smelting in the steel mill; Subsequently, the SKF3 quenching and tempering treatment (quenching + high-temperature tempering) transforms the structure into tempered sorbite, obtaining good comprehensive mechanical properties. The product features include:
- Precise control of chemical composition: Strictly limit the ranges of elements such as carbon, silicon, manganese, chromium, and molybdenum, with a fluctuation value ≤0.03% to ensure batch consistency.
- Uniform quenching and tempering hardness: Under the SKF3 process, the hardness is controlled at HB 220 - 280 (can be fine-tuned according to customer requirements), and the hardness difference across the section is ≤5HB.
- Excellent macrostructure: The central porosity, general porosity, and segregation are all ≤1.5 grades, and there is no shrinkage cavity residue.
- Surface quality guarantee: The round steel is peeled or ground, with no cracks, folds, or scabs on the surface, and the roughness Ra ≤3.2μm.
- Good machinability: After quenching and tempering, the cutting performance is stable, the tool wear is small, and it is suitable for mass production in high-speed machining centers.
The technical specifications are as shown in the following table (typical values, to be confirmed according to the order):
| Parameter item | Indicator |
| Diameter range | 20mm - 300mm |
| Length | 3000mm - 12000mm (can be cut to length) |
| Chemical composition (%) | C:0.38-0.45, Si:0.17-0.37, Mn:0.50-0.80, Cr:0.80-1.10, Mo:0.15-0.25 |
| Tensile strength Rm | ≥850 MPa |
| Yield strength ReL | ≥640 MPa |
| Elongation after fracture A | ≥16% |
| Impact energy (-20℃) | ≥40 J |
| Hardness HB | 220-280 (SKF3 quenched and tempered) |
| Flatness | ≤1.5mm/m |
In addition, we provide a one-stop service of "guaranteed quality and delivery to the factory". Each batch of round steel comes with the original quality guarantee certificate from Xingcheng and a third-party inspection report. Customers can put it into production without secondary inspection. For the common problems faced by automobile parts enterprises, such as large deformation during heat treatment and insufficient machining allowance, we can reserve machining allowance in advance according to the final size of the customer's workpiece and provide recommended heat treatment process parameters to help customers optimize the process and reduce the scrap rate. The company has been deeply involved in the special steel field for many years, and its services cover industries such as petroleum, chemical, shipbuilding, and aerospace. The standards are strict, and customer feedback is good.
Regarding the trust endorsement: Liaocheng Jincheng Yangming Special Steel Co., Ltd. has maintained a stable cooperation with Xingcheng Special Steel for a long time to ensure the regular resource channels. In the past three years, we have cumulatively supplied more than 5000 tons of alloy round steel to many domestic automobile parts supporting enterprises, with a return rate of less than 0.5%, and high customer satisfaction. We adhere to the principle of "seeking truth from facts and honesty as the foundation". All products are executed according to the national standard GB/T 3077-2015 "Alloy structural steel" or more strict enterprise standards. Choosing us means choosing a reliable supply chain partner. If you have questions about the quenching and tempering performance, delivery cycle or personalized requirements of TL4227 alloy structural round steel, it is recommended that you directly contact our technical sales team, inform the specific application parts and load requirements, and we will recommend the most suitable specifications for you and provide a free sample service.
FAQ
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Q: Which steel grade in the national standard does the TL4227 grade correspond to?
Answer: TL4227 is the brand of Xingcheng Special Steel. Its composition and mechanical properties roughly correspond to the 42CrMo or 40CrNiMo series. Please refer to the technical agreement for specific comparison. We suggest you provide the required performance requirements, and we can issue a quality guarantee certificate according to the corresponding standards. -
Question: What is the specific hardness range of SKF3 after quenching and tempering treatment? Can it be adjusted according to the customer's requirements?
Answer: SKF3 is an internal code of our company, representing a specific quenching and tempering process, which usually makes the hardness between HB 220 - 280. If you need a wider or narrower hardness range (such as HB 240 - 260), you can communicate with us in advance, and we will adjust the tempering temperature to meet your requirements. -
Question: Do you provide peeling or fine grinding services for the round steel? What surface roughness can be achieved?
Answer: We can provide peeling or fine grinding processing. After peeling, the surface roughness can reach Ra ≤ 1.6μm, and after fine grinding, it can reach Ra ≤ 0.8μm. The standard delivery is black - skinned or peeled. You can choose according to your needs. -
Question: This batch of round steel is used to manufacture automobile half - shafts. Is additional flaw detection required?
Answer: For key safety parts such as automobile half - shafts, we recommend ultrasonic flaw detection (UT) to detect internal defects. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide flaw detection services according to GB/T 4162 or ASTM A388 grade and issue reports to ensure quality. -
Question: Does the delivery to the factory include unloading? Can it be delivered to remote areas?
Answer: We usually take responsibility for transporting the goods to the vicinity of the customer's factory, and unloading is not included. If you need unloading service, an additional fee will be charged. For remote areas (such as Xinjiang and Tibet), we need to confirm the logistics time limit. We will coordinate special - line transportation to ensure on - time delivery to the factory. -
Question: What should I do if I find uneven hardness or cracks after the goods arrive?
Answer: We promise "quality guarantee". If you find quality problems after the goods arrive, please provide written feedback within 48 hours and keep the original packaging and samples. After verification, if it is indeed our responsibility, we will unconditionally return or exchange the goods and bear the corresponding losses. Samples of each batch of products are kept for 3 months for easy traceability. -
Question: Do you also provide the same services and quality guarantee for small - quantity purchases (such as a few pieces)?
Answer: Yes, we support small - quantity orders, and the minimum order quantity can be as low as 200kg (about 1 piece of round steel). We also provide quality guarantee certificates and delivery - to - factory services, but the freight may be slightly higher, and we will inform you in advance. -
Question: Can you provide recommended heat - treatment processes? Such as quenching temperature and tempering temperature.
Answer: Yes. According to the alloy composition of TL4227, we recommend a quenching temperature of 850 - 870℃, oil cooling or water cooling (depending on the cross - sectional size), and a tempering temperature of 540 - 620℃ (adjusted according to the target hardness). The specific parameter table can be provided with the goods, and you can also communicate with us by phone.
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