What is a high-pressure steel-wire-reinforced hose?

　　 High-pressure steel-wire-reinforced rubber hose It is used for conveying petroleum-based fluids (such as mineral oil, soluble oil, hydraulic oil, fuel oil, and lubricating oil) and water-based fluids (such as emulsions, oil-in-water emulsions, and water) through pipelines. It finds applications in mining hydraulic supports, oilfield development, construction projects, lifting and transportation, metallurgical forging, mining equipment, marine vessels, injection molding machinery, agricultural machinery, various machine tools, and the mechanized and automated hydraulic systems of diverse industrial sectors.

　　According to the manufacturing process, they are mainly classified into high-pressure steel-wire-braided hoses and High-pressure steel-wire-reinforced rubber hose The structure of high-pressure wire‑braided rubber hoses consists primarily of an inner liner made of fluid‑resistant synthetic rubber, an intermediate rubber layer, one to three layers of steel wire braiding, and an outer cover of weather‑resistant synthetic rubber. High-pressure wire‑wound rubber hoses are composed mainly of an inner liner, an intermediate rubber layer, four or more alternating layers of steel wire reinforcement, and an outer rubber cover. The inner liner withstands the pressure of the conveyed medium and protects the steel wires from corrosion, while the outer rubber layer serves as a protective sheath that shields the reinforcement from damage. Typical working pressures for high‑pressure hoses range from 7 to 32 MPa; ultra‑high‑pressure hoses operate at pressures exceeding 32 MPa. Ultra‑high‑pressure hoses generally employ a wire‑wound construction, with maximum working pressures reaching 70 to 120 MPa. Operating temperature ranges: for high‑pressure wire‑wound hoses (high‑pressure oil lines), –40 to 120°C; for high‑temperature wire‑braided hoses, –40 to 100°C when used with oil, –30 to 50°C with air, and up to +80°C when handling water‑based emulsions.

　　Based on the operating conditions of high-pressure hoses—such as temperature, pressure, and the service medium—the inner rubber layer of construction‑equipment hoses should be CR or EPDM, while the outer rubber layer should be EPDM and/or CR. For petroleum‑industry hoses, the inner rubber layer is typically NBR/PVC, FKM, FKM/CSM, or NBR, and the outer rubber layer is NBR/PVC, FKM, FKM/CSM, FKM/Eco, NBR, or CR. In other industries, hydraulic hoses use ACM, VMQ, FKM, AEM, or EPDM for the inner rubber layer, and ACM, FKM, AEM, or EPDM for the outer rubber layer. As flexible hoses, rubber hoses must remain pliable within a specified minimum bend radius. The inner rubber layer must exhibit oil resistance and moderate chemical resistance. The intermediate rubber layer serves as a cushioning barrier, while the reinforcing layer provides pressure‑resistance. The outer rubber layer is required to withstand various forms of aging and possess a certain degree of abrasion resistance.

　　Thermax medium‑particle pyrolytic carbon black N990 is a unique, large‑particle‑size (low‑specific‑surface‑area), low‑structure carbon black produced via natural‑gas pyrolysis. Thermax carbon black not only imparts excellent oil resistance, heat resistance, and chemical resistance to rubber products but also endows them with outstanding dynamic performance. Its large particle size and low structure enable rubber compounds and finished products to exhibit low shrinkage deformation, high resilience, and low hysteresis loss.

　　 High-pressure steel-wire-reinforced rubber hose The interior incorporates a carbon-black‑reinforced rubber layer. Its high filler content helps reduce rubber costs, enhances oil resistance and chemical‑resistance, improves the dynamic performance of the rubber within the intermediate layer, withstands greater pressure pulsations, and strengthens adhesion between the rubber layer and the reinforcing plies (such as steel cords), thereby meeting the aging‑resistance requirements of carbon‑black‑based anti‑aging strategies.

　　High-pressure steel‑wire‑reinforced hoses feature a high rubber hardness, often exceeding 70 Shore A. Preventing heat generation and scorching during processing and extrusion is a critical concern. Using excessive amounts of process oils or chemical additives to enhance processability not only poses environmental risks but also significantly degrades the long-term performance of rubber hose products.