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Wire Rod SWRH72A
High strength and wear resistance
Carbon content 0.70%-0.75%, tensile strength of 1250-1400MPa, suitable for high-load scenarios.
Precision processing performance
Surface finish Ra≤0.8μm, supports complex forming processes such as cold heading and drawing.
Corrosion-resistant treatment
Galvanized and phosphating coatings are optional, extending the service life by more than 30%.
International standard certification
Complies with JIS G3502, GB/T 4354 and other standards to meet global procurement needs.
| Parameters | Value range | Test standard |
|---|---|---|
| Diameter range | 5.5mm–20mm (customization supported) | ASTM E8 |
| Tensile strength | 1250–1400 MPa | ISO 6892-1 |
| Elongation (δ5) | ≥8% | JIS Z2241 |
Production Process
Steelmaking process
Converter primary refining: Use oxygen top-blown converter (BOF) or top-bottom combined blowing technology to smelt, the final carbon content is accurately controlled to the target range, and argon blowing and stirring are implemented at the bottom of the ladle to uniform the composition.
Secondary refining: Optimize the morphology of inclusions through LF furnace refining, use low-basicity slag to reduce the sulfur and phosphorus content, and RH vacuum treatment to reduce the total oxygen content of the molten steel to ≤13ppm.
Composition control: Ensure the carbon content is 0.69-0.76%, the manganese content is 0.30-0.60%, and the sulfur and phosphorus impurities are strictly controlled to ≤0.03%.
Continuous casting process
Protective casting: Argon gas is sealed throughout the process to prevent secondary oxidation of molten steel. The continuous casting machine uses R5m arc type to produce 110mm×110mm square billets.
Solidification control: By adjusting the temperature of the tundish and the pulling speed (typical value 0.9-1.1m/min), the center segregation index of the billet is stabilized at 0.94-1.06.
Rolling and controlled cooling
Heating rolling: The billet is heated to 1100-1200℃ in a step-type heating furnace, and multi-pass controlled rolling is performed on a high-speed wire rod mill, and the final rolling temperature is controlled at 850-950℃.
Controlled cooling process: After rolling, the wire enters the Stelmor controlled cooling line for graded cooling, and the final cooling temperature is ≤600℃ to obtain a uniform sorbite structure with a tensile strength of ≥1200MPa.
Quality verification and optimization
Performance testing: tensile strength and microstructure are verified through tensile testing and metallographic analysis to ensure that the application requirements of tire bead wire, hose wire, etc. are met.
Process iteration: In view of the residual Class B inclusions in the trial production, the refined slag composition and argon blowing parameters are optimized to improve the purity of the finished product.
Key process advantages
Cost control: The domestic process reduces dependence on imported equipment, and the production cost is 15-20% lower than similar imported materials.
Performance benchmark: The finished steel wire rod drawing performance is better than the JIS G3502 standard, and can replace similar products of Kobe Steel in Japan.
Application
Metal wire products
Quality steel wire rod SWRH72A is widely used in the production of steel wire ropes, aluminum-clad steel wires, hose steel wires, fishing nets and other products.
It can be processed into high-carbon steel wires, oil-tempered steel wires, etc. through precision drawing processes to meet the strength requirements of complex working conditions.
Large structural parts
Prime steel wire rod SWRH72A is used in the manufacture of metal components that bear static loads, such as railway bridges and building frames, and performs outstandingly in the scenario of replacing imported materials. In some projects (such as speed skating halls, etc.), its cost advantage and mechanical properties have become the key basis for material selection.
Springs and elastic elements
As the base material of carbon spring steel wire, hot rolled steel wire SWRH72A is suitable for the processing of precision parts such as automobile suspension springs and mechanical valve springs. The product has a high troostitization ratio and excellent decarburization layer control.
Special material for musical instruments
One of the raw materials for piano wire, it relies on the balance between hardness and ductility to achieve stable sound quality.
Other applications
There are also adaptation cases in the sub-sectors of hardware tools, bearing accessories, etc., and different specifications can be met by adjusting the drawing process.
Three major trends in the steel wire rod in coil industry in 2024
Green manufacturing
Using arc furnace short process, carbon emissions are reduced by 40%.
Intelligent production
AI visual inspection system achieves zero defect management.
Compound demand
Develop composite wire with stainless steel coated high carbon steel.
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A.Yes, we would the goods test before delivery.
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