Xingtai Delong Mechanical Roller Co., Ltd. was established in June 2007. It is a wholly foreign-owned enterprise invested and built by Singapore listed company Delong Holdings, with a registered capital of 28 million US dollars and a total investment of 49.75 million US dollars.
The company is located in Xingtai City, Hebei Province, with a factory area of 364,000 square meters and an industrial workshop area of 64,337 square meters. The company has total assets of 604.88 million yuan, fixed assets of 447.72 million yuan, and more than 500 employees, including more than 50 scientific and technological personnel. The company is a high-end boutique roll manufacturing enterprise with wide-band steel cold and hot strip mill rolls, large-scale steel rolling rolls and large-scale castings and forgings as the leading products, and is now a national high-tech enterprise.
Main process equipment
The company's overall equipment strength ranks at the international leading level, and its core equipment is imported from international first-class enterprises. There are 3 medium frequency induction melting furnaces; 1 30t EAF and 45/70t LF/VD furnaces; 1 0t and15t electroslag furnaces1set; 2 medium horizontal centrifuges and 1 small horizontal centrifuges; 45MN forging hydraulic press 1 set; 1 dual-frequency quenching machine tool; Two temperature difference heat treatment furnaces; Heat treatment furnace set *** 16 sets; There are 44 processing equipments, including 3 CNC lathes, 4 CNC grinders and 2 CNC double-sided milling machines. Among them, the medium-sized horizontal centrifuge is imported from CMCC of the United States, and the transmission mechanism is hydraulic motor; The control system of dual-frequency quenching machine tool is imported from Belgium; The core components of 45MN hydraulic press are made in Germany.
Quality inspection equipment
The company strictly controls the product quality, and has a complete inspection process and control means from raw and auxiliary materials to finished products. It is equipped with advanced testing equipment such as X-ray fluorescence analyzer, plasma emission spectrometer, photoelectric direct reading spectrometer, hydrogen, oxygen and nitrogen combined analyzer, carbon and sulfur analyzer, metallographic microscope, image analyzer, microhardness tester, Rockwell hardness tester, universal material testing machine, impact testing machine, analog and digital ultrasonic flaw detector, magnetic particle flaw detector, stress tester and field hardness tester.
The company's leading products
The company has two complete production lines: casting rolls and forging steel rolls.
The casting roll production line can produce centrifugal rolls, large roll rings, nodular cast iron rolls and large cast steel rolls with various specifications of φ400㎜~φ 1600㎜. It covers high nickel chromium, high chromium iron, high chromium steel, high speed steel, semi-high speed steel, large ductile iron rolls, composite cast steel backup rolls and various semi-steel and alloy cast steel series roll products. The production capacity of casting rolls is 35,000 tons/year, which can meet the needs of work rolls, rough rolls, backup rolls and large section steel mills.
The forged steel roll production line can produce a series of cold-rolled work rolls, intermediate rolls and backup rolls made of φ 280 ㎜-φ 800 ㎜, Cr2-Cr8 and semi-high speed steel. The production capacity of forging rolls is 5000 tons/year, and we provide forging ingots, forging blanks and castings and forgings for domestic and foreign customers. Rolling properties of medium and wide strip mills, wide strip mills, medium and heavy plate mills and stainless steel mills. In the forefront of similar products at home and abroad. The company's products have entered the top domestic steel enterprises and more than 40 large enterprises, and established cooperative relations with dozens of steel enterprises and agents around the world.
In addition, the company can also produce composite cast steel rolls with single weight less than 35 tons for cold and hot rolling mills, as well as various series of cast steel rolls such as semi-steel and alloy cast steel; Large section steel and bar mill pass roll, roll sleeve roll shaft combined roll; High alloy large castings and forgings and other products; Carry out roll repair and remanufacturing business, and wholeheartedly provide all-round services for iron and steel enterprises.
Product process flow and characteristics
1. Main technological processes of high-nickel-chromium centrifugal roller: molding, melting, centrifugal casting, cleaning, heat treatment, processing, packaging and delivery.
Features:
(1) The composition of the working layer adopts multi-element microalloying technology, which gives consideration to wear resistance and accident resistance and has better comprehensive performance.
(2) controlled temperature cooling annealing after casting: the microstructure transformation is more complete and the stress state is more stable.
2. The main technological processes of high-speed steel, high-chromium steel and high-chromium cast iron centrifugal rolls: forming, melting, centrifugal casting, cleaning, preliminary heat treatment, rough machining, differential temperature treatment, finishing, packaging and delivery.
Features:
(1) adopts multi-layer composite technology, which effectively prevents the diffusion of high alloy content in the working layer to the core structure and ensures the strength and toughness of the core structure.
(2) Using differential heat treatment technology, the microstructure changes fully and the stress distribution is more stable and reasonable.
3. The main process flow of forged steel roll: electric arc furnace smelting, LF\VD refining, ingot casting, annealing, cleaning, electroslag remelting, hot delivery or annealing, forging, post-forging heat treatment, rough machining, preliminary heat treatment, semi-finishing, dual-frequency quenching or differential temperature treatment, cryogenic treatment, tempering, finishing, packaging and shipping.
Features:
(1) double refining+electroslag remelting to ensure good metallurgical quality.
(2) Perfect technical means of heat treatment and cold treatment to ensure the depth and hardness uniformity of hardened layer.
Scientific research and development strength
The company has a team of technical experts composed of all kinds of professionals, and has the research, design and development ability to provide new materials and new processes for various modern rolling mills, and can provide differentiated products and special services for different rolling mill conditions, basically forming a perfect roll R&D and independent innovation base, and establishing cooperative relations with many domestic colleges and universities. In 2008, the company has developed high-speed steel rolls, which have been successfully applied to four top steel enterprises and nearly ten large enterprises in China, and achieved excellent results. In recent years, new types of high-speed steel rolls, such as roughing high-speed steel, finishing high-speed steel after rolling and finishing high-speed steel on medium and wide strip mill, have been successfully developed. At present, the company has been authorized with 1 invention patents and 6 utility model patents, and many patent applications have been accepted by the State Patent Office.
Business philosophy of the company
The company always adheres to the marketing concept of "taking root in China and serving the world", and provides high-quality products for domestic and foreign iron and steel enterprises with the best and most sincere service to create more value for customers. Delong Road Roller sincerely cooperates with you for mutual benefit and creates the future together!
Nowadays, the broad masses of cadres and workers stand on their posts, work conscientiously, and work towards better goals and? With the vision of "casting Delong for a hundred years", we will build an industry benchmark and forge ahead!