Dexin Steel Tube (China) Co., Ltd. (hereinafter referred to as Dexin Steel Tube) was established in August 2002. Initially, it produced seamless steel pipes using medium-frequency hot expansion and internal boring with external turning methods. Since 2014, it has adopted the cold drawing process to produce high-precision seamless steel pipes for gas cylinders. From 2017 to the present, while procuring hot-rolled steel pipes, it has leveraged the production capacities of the Tianhuai Steel Pipe 508 continuous rolling mill and the Wuhan Heavy Industry 864 rolling mill to process steel billets on a commissioned basis, with an annual processing volume currently reaching 150,000 tons. For products that cannot be rolled, are uneconomical or inconvenient to produce—particularly large-diameter thin-walled and ultra-thin-walled seamless steel pipes with a diameter greater than 508 mm and a diameter-to-wall ratio greater than 25—the medium-frequency hot expansion process is adopted. Dexin currently operates nine medium-frequency hot expansion production lines, capable of producing seamless steel pipes with diameters up to 1250 mm, diameter-to-wall ratios up to 100, and lengths exceeding 12 meters, in various standards, materials, and specifications, with an annual production capacity of 100,000 tons of hot-expanded steel pipes. Dexin also operates seven cold drawing production lines, capable of producing 60,000 tons of precision seamless steel pipes ranging from Φ16.7 to 914 mm, as well as five large lathes and deep-hole boring machines for cold processing of various high-precision large-diameter thick-walled seamless steel pipes. Dexin Steel Tube has become a leading enterprise in China's seamless steel pipe industry, capable of producing both small and large diameters, with complete hot rolling, cold drawing, and hot expansion processes.
What sets Dexin Steel Tube apart is its strong steel pipe finishing and heat treatment capabilities. It currently operates six heat treatment furnaces (three box-type furnaces and three roller-hearth furnaces), capable of normalizing, tempering, annealing, and quenching steel pipes of various diameters up to Φ2400 mm. It has three multi-roll straightening machines and four point straightening machines, seven internal and external polishing machines, sixteen internal and external grinding machines, as well as phosphating, saponification, pipe end processing, UV water-based spraying, and other production equipment, along with fully integrated physical and chemical analysis, mechanical property testing, non-destructive testing, and hydrostatic testing equipment.
The high-quality steel billets of carbon steel, carbon-manganese steel, and chromium-molybdenum steel ordered by Dexin Steel Tube, produced via the LD+LF+RH/VD+CCM process, effectively control the content of C, P, S, as well as N, H, O gases and the five major harmful elements, ensuring the quality of steel pipes from the source while also guaranteeing the length and delivery schedule of finished pipes. With year-round reserves of Φ380, Φ450, Φ500, and Φ600 pipe billets in various materials, Dexin can produce hot-rolled steel pipes of Φ273 to Φ508 or larger diameters upon order. Combined with its hot expansion, cold drawing, heat treatment, and finishing capabilities, Dexin can flexibly and efficiently organize production to meet user requirements for various specifications, quantities, and standards of high-sulfur-resistant pipes, SSC-resistant pipes, HIC-resistant pipes, low-temperature pipes, line pipes, gas cylinder pipes, American standard pipes, and medium- and low-pressure piping materials, achieving the goal of "rapid delivery within 30 days" for urgent materials.
Dexin Steel Tube has successively obtained the A1, A2 (1), (3), B (1), (3) special equipment manufacturing licenses (pressure piping component manufacturing licenses) issued by the General Administration of Quality Supervision, Inspection and Quarantine, as well as type test reports for various materials, standards, and specifications. It has passed ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health and safety management system certification, SA8000 social responsibility management system certification, Sinopec EPEC quality certification, American Petroleum Institute API 5L certification, American ASME/ASTM product certification, and EU Pressure Equipment Directive PED97/23/EC certification. It has also obtained qualification certifications from overseas petrochemical and power companies including ALSTOM, FLUOR, KNPC, Brazil Petrochemical CRCC, India BHEL, South Korea Samsung Heavy Industries, and Russia Petroleum.
Dexin Steel Tube (China) Co., Ltd. and Wuxi Special Steel Materials Co., Ltd. operate as one management team under two names—the former focusing on production and the latter on trading. With 50,000 square meters of indoor warehousing and a standing inventory of 35,000 tons of steel pipes, they have established long-term cooperative relationships with major steel pipe manufacturers both domestically and internationally, possessing the capability and experience for long-term supply to petrochemical projects. They have earned industry reputation and customer favor through quality products and services, becoming qualified suppliers of alloy steel pipes and carbon steel pipes to Sinopec, member units of CNPC's "Energy No.1 Network," Class A material suppliers to CNPC, first-tier member suppliers to CNOOC, as well as qualified suppliers to China Coal, Sinochem, China Huadian, China Huaneng, China National Nuclear Corporation, and military materials.
In response to the national strategy of "innovation-driven development," Dexin Steel Tube places great emphasis on innovation, excellence, and brand building. It has recruited various technical personnel and vigorously strengthened scientific research and technological innovation, successively obtaining multiple utility model patents and invention certificates, including several invention patents. No less than 20 million yuan is invested annually in equipment renewal and upgrades. In December 2017, the China Iron and Steel Association released the T/CISA002-2017 group standard "Medium-frequency hot-expanded seamless steel pipes for high-pressure boilers," for which Dexin Steel Tube served as the lead drafting unit.
Over the past 10 years, Dexin Steel Tube has supplied nearly one million tons of self-produced seamless steel pipes to more than 2,000 users across 28 countries and regions. Some of these pipes have been in safe service for over 100,000 hours, demonstrating reliable quality and stable performance, and have received recognition and praise from users both domestically and internationally.
Following the interpretation letter issued by the Steel Pipe Technical Committee of the National Steel Standardization Committee on July 9 this year, which recognized the medium-frequency hot expansion process as continuous integral heating, in compliance with the provision in the GB/T5310-2017 standard that "hot-expanded steel pipes shall be pipes formed by expanding billet pipes to larger diameters after integral heating," and the forthcoming revision of the GB/T5310 standard, user concerns and barriers regarding the use of medium-frequency hot-expanded steel pipes have been removed. Design institutes have correspondingly lifted restrictions on the use of medium-frequency hot-expanded seamless steel pipes. It is foreseeable that longer and larger-diameter seamless steel pipes will find broader applications in petroleum and chemical engineering construction and modern material upgrades, playing an even greater role.
"Forging ahead for sixteen years, Dexin Steel Tube builds its brand" and "Cultivating virtue through excellence, building a century-old special steel enterprise"—we will uphold the business philosophy of "safety, quality, integrity, and putting users first in everything," honor our commitment of "utmost credibility, purest quality, and sincerest service," and continue to provide quality products and services to both new and existing customers. Dexin Steel Tube is a major domestic seamless steel pipe manufacturer and is committed to becoming a first-class steel pipe supplier and service provider both domestically and internationally.
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