Manufacturing Base

Select high-quality billets (such as 60Si2Mn, 42CrMo4, S45C) that meet international standards such as ASTM, GB, EN, DIN and so on. Each batch is tested by a spectrometer to ensure that the content of the key elements is less than 0.02%.

The rough steel is removed from rust by pellets and is detected by whirlpool or ultrasonic to remove surface cracks and inclusions. Then cut according to the order, the length tolerance is controlled within ± 2mm.

The rough steel is melted in arc furnaces or induction furnaces, and temperature (1550 - 1650 ° C) and composition are monitored throughout the process to ensure that the alloy is evenly distributed.

Through LF furnace refining to remove impurities and fine-tune the composition, for high-requirement steel grades such as 60Si2Mn, additional VD/VOD vacuum degassing is employed to reduce gas content to ≤20 ppm, thereby enhancing the purity of the material.

Based on the type of product, it is produced using hot rolling or forging processes to ensure precise dimensions and uniform wall thickness.

• ● Round bars: Multi-pass rolling controls diameter precision (e.g., φ16mm, tolerance ≤ ±0.1mm)
• ● Tubes: Seamless piercing combined with cold drawing ensures consistent wall thickness (tolerance ≤ ±5%)

The quenching, tempering, and annealing processes are tailored to each steel grade. For example, 60Si2Mn spring steel is quenched at 860°C and undergoes medium-temperature tempering at 480°C. Final performance is verified through hardness and tensile testing to ensure consistent and compliant results.

Use a straightening machine to ensure straightness (≤0.5 mm/m), precisely cut to specified dimensions (e.g., a 6-meter length with tolerances of ≤±5 mm), and perform end chamfering and deburring.

• ● Chemical Composition: Each batch undergoes spectroscopic or chemical analysis to verify alloying elements meet grade specifications.
• ● Mechanical Properties: Batch samples are tested for tensile, impact, hardness, and bending to confirm strength, toughness, and ductility.
• ● Dimensions & Tolerances: Critical dimensions are 100% checked using precision gauges and automated equipment to ensure accuracy.
• ● Process Performance: Upsetting, flaring, and flattening tests assess material processability.
• ● Non-Destructive & Surface: 100% of parts undergo eddy current and ultrasonic testing, with visual checks to remove scratches, dents, and other surface defects.
• ● Final Pre-Packaging: Manual and machine-vision checks ensure surface quality and compliance before shipment.

Use water- and moisture-resistant woven bags combined with wooden pallets. Each pallet should not exceed 2 tons, and protective edges and corners should be added to ensure safe transportation.

Each bundle is clearly marked with information on the type of steel, specifications, furnace number, batch number, net weight, and the applicable standards. It includes an English label and meets international logistics and customs clearance requirements.

We arrange sea, air, or land transportation according to customer requirements, and cooperate with professional hazardous goods logistics providers when needed to ensure safe and compliant delivery of specialty steel products.

A complete set of customs clearance documents is provided, including commercial invoice, packing list, material test certificate (MTC), and certificate of origin (CO/FORM E).

Customers receive real-time tracking numbers to monitor shipment progress online. Standard orders are typically delivered to major ports within 30–40 days.