As a key component widely used in modern industry, the performance of high-pressure steel wire braided rubber hoses directly depends on the scientific selection and combination of materials. The structure of such rubber hoses usually consists of an inner adhesive layer, a reinforcement layer, and an outer adhesive layer, and the material selection of the reinforcement layer is particularly critical, mainly divided into two categories: non-metallic materials and metallic materials. Each material has its unique physical and chemical properties, suitable for different working environments and technical requirements.

1、 Application and Characteristics of Non metallic Materials

Non metallic materials are mainly used for the inner and outer rubber layers in high-pressure steel wire braided rubber hoses. Their core functions are sealing media, anti-corrosion and wear-resistant, and adaptability to complex environments. Common non-metallic materials include:

1. Synthetic rubber

① Nitrile rubber (NBR): Due to its excellent oil resistance, it is widely used in rubber hoses for transporting petroleum based hydraulic oil. The cyanide group in its molecular structure can effectively resist oil swelling, and the working temperature range is usually from -30 ℃ to 100 ℃.

② Chloroprene rubber (CR): It has high weather resistance and flame retardancy, suitable for outdoor or mining machinery and other scenarios. Its resistance to ozone aging is over 30% higher than that of natural rubber.

③ Ethylene propylene diene monomer (EPDM): With outstanding acid and alkali resistance and steam resistance, it is commonly used in the chemical industry.

2. Thermoplastic elastomers (TPE)

This type of material combines the elasticity of rubber with the ease of processing of plastic. For example, TPU (polyurethane elastomer) is used as the outer layer of high-pressure rubber hoses in construction machinery due to its high wear resistance (only 1/5 of that of natural rubber).

3. Fiber reinforced materials

Aramid or polyester fibers are often used as non-metallic reinforcement layers, compounded with steel wire weaving layers. The specific strength of aramid fiber is 5 times that of steel wire, which can reduce the weight of rubber hoses by more than 20% and is suitable for aviation hydraulic systems.

2、 The key role of metal materials

Metal materials are mainly used as reinforcement layers to undertake the core functions of pressure resistance and tensile resistance of rubber hoses

1. High strength steel wire

① Copper plated steel wire: A 1-3 μ m copper layer is formed on the surface of the steel wire through electroplating process, which improves the adhesion strength with rubber (the peeling force can reach 15N/mm or more).

② Stainless steel wire: 304 or 316 stainless steel wire is used in corrosive environments, such as hydraulic systems on offshore platforms. 316 steel wire showed no red rust after 500 hours in a 3.5% salt spray test.

2. Optimization of weaving process

Modern rubber hoses often use 2-4 layers of steel wire interlaced weaving, and the weaving angle is designed to withstand axial and radial pressure evenly when the weaving angle is 54 ° 44 ′. Experiments have shown that the blasting pressure of a three-layer woven structure can reach 70 MPa, which is 2.3 times that of a single layer.

3. Application of special alloys

In the field of ultra-high pressure (such as above 100MPa), using tungsten alloy steel wire or silicon carbide coated steel wire can increase the pressure bearing capacity of the hose by 40%, but the cost increases by about 200%.

3、 The synergistic effect of material combination

Advanced hose design emphasizes the composite effect of materials:

1. Adhesive technology: Using meta methylene white system adhesive (such as RH-2), the adhesive strength between rubber and steel wire is increased to over 8kN/m.

2. Temperature adaptability: The high-pressure steel wire braided rubber hose used in the Arctic region can maintain flexibility at -55 ℃ through a combination of EPDM inner layer coated with bronze steel wire and silicone rubber outer layer.

3. Dynamic fatigue performance: The optimized material system enables the hose to pass 2 million pulse tests at 2.5 times the working pressure, far exceeding the requirements of ISO 6803 standard.

Through continuous material innovation and process improvement, high-pressure steel wire braided rubber hoses are developing towards higher pressure levels (150MPa), longer lifespan (10 years of maintenance free), and greater intelligence, providing key support for various fields.