Low relaxation prestressed steel strand is the company's key product, and its application field is located in supporting high-end concrete structures such as railways, highways, bridges, mines, nuclear power plants, hydraulics and long-span buildings.
The low relaxation prestressed steel strand is made of seven (1×7) and 19 (1× 19) cold-drawn round steel wires or nickel steel wires, which is a kind of stabilized concrete structural material with high efficiency and energy saving. It is a low relaxation product with independent intellectual property rights and core competitiveness, and the physical quality of the product is the international advanced level.
This product is at the advanced level in the world in terms of diameter and structure, especially in the field of rock reinforcement in mines and coal mines. It has the characteristics of high strength, high breaking tension, high ductility and low supporting cost, and plays a very good role in increasing anchoring force and improving safety factor in the field of coal mine and coal mine rock reinforcement.
Develop unbonded, slow-bonded and electroplated Galfan products with stronger corrosion resistance; Form a series of low relaxation prestressed steel strand products with complete structure, the largest specification and the highest strength in China.
Test equipment: 200-ton tensile testing machine and 100-ton relaxation testing machine are jointly developed with the cooperative manufacturer * *, which is the first in China.
2, high quality steel wire
The main products are: heat-treated phosphating steel wire for wire rope, steel core for aluminum-clad steel and high-strength coarse galvanized steel wire. In terms of process layout and equipment selection, fully consider the different technical requirements of the next process and market, so as to achieve product specialization, continuity, high speed, large-scale heavy industry turnover, strong compatibility, energy saving and environmental protection.
① Heat-treated phosphating steel wire: the steel wire used for steel wire rope uses natural gas as fuel, and the open flame heating furnace is compatible with I-beam unwinding 1250/800, and the DV value is ≥65. It has advanced premixed heat exchange system, fully enclosed lead pump circulation system is adopted for lead bath quenching, and lead liquid surface covering agent inhibits lead smoke. The control accuracy of furnace temperature and lead temperature reaches the set temperature t 2℃, the oxidation loss is less than or equal to 0.3%, and the strength dispersion of steel wire is less than or equal to ≯30MPa.
The steel wire used for aluminum-clad steel is fueled by natural gas, stainless steel heat-resistant tubes are installed in the heating furnace, protected by nitrogen, and the I-wheel is compatible with 1250/ 1400, and the DV value is ≥65. Lead bath quenching adopts fully enclosed lead pump circulation system, and the surface of lead liquid is covered with covering agent to suppress lead smoke. The control accuracy of furnace temperature and lead temperature reaches the set temperature t 2℃, the oxidation loss is less than or equal to 0.3%, and the strength dispersion of steel wire is less than or equal to ≯30MPa.
(2) Galvanized steel wire: I-wheel is installed horizontally, with 24-wire active damping pay-off device and traction storage line. The hot dip galvanizing process adopts natural gas internal heating, and the zinc temperature can be controlled at 3℃. Galvanizing wiping system adopts New Zealand electromagnetic wiping technology, DV value 120- 150. The zinc content on galvanized steel wire must meet the requirements of ASTM -A 498 A and B, and the weight of zinc layer is dispersed: A 10g/m2, and B-20g/m2. Strength: 1770MPa.
3, aluminum-clad steel wire and steel strand
This product has good strength of steel and good corrosion resistance and conductivity of aluminum. Widely used in various fields of national economy, such as broadcasting and communication, power transmission, electrified railways, etc.
Aluminum-clad steel strand: this product is positioned to provide 20AC for 500KV, 750KV, 1000KV EHV transmission lines and optical fiber composite overhead ground wires in China; 30AC40AC conductivity and 500m2- 1000m2.
Large-section aluminum-clad aluminum stranded wire has bright surface, high strength (1670- 1770MPa), and ultra-long (more than 2,500 meters) aluminum-clad steel wire, stranded wire and optical fiber composite overhead ground wire. The scale and quality of aluminum-clad steel wire and stranded wire rank first in China.
Aluminum-clad steel strand production equipment:
It is the most advanced technology in the world to introduce British BWE company's aluminum heating extrusion continuous coating machine and intelligent aluminum-clad steel production line. Introduce the internationally advanced steel-aluminum composite synchronous drawing unit produced by FRIGERIO company in Italy.
4, welding wire
Welding materials are the basis of welding technology and provide support for advanced welding technology and welding equipment. Welding wires include carbon steel flux-cored wire for gas shielded welding and carbon steel and low alloy steel welding wires. Gas shielded welding wire is 0.8- 1.6mm, submerged arc welding wire is 2.0-5.0mm, flux-cored wire is 1.2- 1.6mm, which are widely used in shipbuilding, vehicles, power station equipment, petrochemical industry, aerospace and heavy-duty industries.
Our company has introduced the internationally advanced flux-cored wire production line. The products are located in shipbuilding, container, steel structure and petrochemical industry, pressure vessel, medical advanced welding wire, low-alloy high-strength gas shielded welding wire and heavy barrel gas shielded welding wire. The product has independent intellectual property rights and core competitiveness, and the physical quality has reached the international advanced level.
Welding wire production equipment:
Introduce Germany's advanced flux-cored wire production unit; Introduce Italian barrel welding wire fine winding unit; Adopt domestic first-class continuous gas shielded welding wire production line.
5, elevator wire rope
This product is located in wire rope for high-speed elevator.
Elevator rope fatigue times 600,000 times; Rope diameter 5-13mm; Composite steel core; Meet the requirements of 4m/s high-speed elevator, and form an R&D base for elevator wire rope production with the best quality, the most complete variety and the most competitive in advance, extending in the direction of tight strand, irregular strand, sealing rope and composite strand large-size wire rope.
Form the R&D elevator wire rope production base with the best quality, the most complete variety and the most competitive. The product has independent intellectual property rights and core competitiveness, and the physical quality has reached the international advanced level.
The wire rope pre-tensioning device produced by SKET company in Germany is introduced, and the ultra-long online pre-tensioning technology is adopted. It is the first double twisting machine in China that introduced the international advanced level of Spain.
Self-developed test equipment: Otis elevator wire rope special fatigue testing machine, Japan series elevator wire rope special fatigue testing machine, are the first in China.