August 21 Shijiazhuang Steel Market Price Quotes
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**Steel Price Update: April 2025**
Below is the latest steel price information for various products, including general lines, rebar, hot rolled coils, cold rolled coils, medium plates, and structural sections. Prices are listed in yuan per ton, compared to yesterday, last week, and the previous month.
- **General Line Φ6.5/8mm Q235 (Handan Steel):** 5,200 yuan/ton. No change from yesterday, down 100 yuan from last week, and down 350 yuan from the previous month.
- **High-Line Φ6.5/8mm Q235 (Handan Steel):** 5,400 yuan/ton. Stable compared to yesterday, down 80 yuan from last week, and down 350 yuan from the previous month.
- **High-Line Φ6.5/8mm Q235 (Shougang):** 5,400 yuan/ton. Same as yesterday, down 80 yuan from last week, and down 350 yuan from the previous month.
- **Rebar Φ12mm HRB335 (Handan Steel):** 5,560 yuan/ton. Down 40 yuan from yesterday, 140 yuan from last week, and 290 yuan from the previous month.
- **Rebar Φ16–25mm HRB335 (Handan Steel):** 5,360 yuan/ton. Down 40 yuan from yesterday, 140 yuan from last week, and 290 yuan from the previous month.
- **Hot Rolled Coil 2.0*1500*c Q235:** 5,800 yuan/ton. No change from yesterday, down 120 yuan from last week, and down 530 yuan from the previous month.
- **Cold Rolled Coil 1.0*1000*2000 SPCC (Angang):** 7,600 yuan/ton. Stable from yesterday, no change from last week, and down 100 yuan from the previous month.
- **Puzhong Plate 8mm Q235 (Handan Steel):** 6,650 yuan/ton. Up 120 yuan from yesterday, down 150 yuan from last week, and down 370 yuan from the previous month.
- **I-Beam 25# Q235 (Laiwu Steel):** 5,400 yuan/ton. No changes observed in all time frames.
- **Channel 16# Q235 (Jiangtian):** 5,550 yuan/ton. Stable across all comparisons.
Market conditions remain fluctuating, with slight declines observed in most steel products due to seasonal demand and supply adjustments. Buyers are advised to monitor prices closely for potential opportunities in the coming weeks.
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Ultra high frequency induction heating system is an advanced heating technology that uses very high frequencies (generally referring to the frequency range above 100kHz) for induction heating. This heating method mainly relies on the principle of electromagnetic induction, which can generate high temperatures in an instant and is suitable for precision heating of metal materials, such as welding, surface hardening, hot assembly, and other processes. Compared to low-frequency and mid frequency induction heating, ultra-high frequency induction heating systems have higher heating rates and more precise heating control capabilities.
working principle
Ultra high frequency induction heating mainly utilizes the high-speed changing magnetic field generated by high-frequency alternating current in the induction coil, which excites strong eddy currents in the target metal. Due to their extremely high frequency, these vortices concentrate in thin layers on the metal surface, causing rapid surface heating while the interior is relatively cold. This phenomenon is called the "skin effect", making ultra-high frequency induction heating very suitable for surface treatment of metal materials.
Characteristics and advantages
Rapid heating: Ultra high frequency means extremely fast heating speed, which can reach the desired temperature in milliseconds.
Precise control: capable of achieving highly precise temperature and depth control, suitable for workpieces with complex shapes and sizes.
Local heating: only heats the surface or specific area of the workpiece, without affecting the overall properties, reducing material waste and thermal stress.
Efficient and energy-saving: Compared to other heating methods, it has high energy conversion efficiency and is energy-saving and environmentally friendly.
Environmental safety: No need for fuel combustion, no smoke or gas emissions, and a cleaner operating environment.
application area
The ultra-high frequency induction heating system is widely used in the following fields due to its unique heating characteristics and advantages:
Metal welding: precision welding of small parts and electronic components.
Surface hardening: By locally quenching, the surface hardness of the workpiece is increased without changing the core properties.
Hot assembly: used for heating assembly of tight fitting parts.
Precision casting: precise control of metal melting and casting processes.
Research experiment: Conduct rapid heating tests in materials science and physics experiments.
Development Status and Trends
With the advancement of technology, ultra-high frequency induction heating systems continue to innovate in technology, developing towards higher frequencies, greater power, and greater intelligence. In addition, the increasing demand for environmental protection and energy efficiency has prompted researchers in this field to explore more green and low-carbon solutions, such as using more efficient cooling systems and intelligent control systems to further enhance the overall performance of equipment.
In the future, ultra-high frequency induction heating systems are expected to play a role in a wider range of industrial fields and become one of the key technologies driving the upgrading and transformation of the manufacturing industry.
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Ningbo Dedao Electronic Technology Co., Ltd , https://www.nbdedao.com