Huizhou Pengchengrui Technology Co., Ltd.

Nickel titanium alloy rope is a flexible rope made by twisting and twisting multiple nickel titanium memory alloy filaments. It inherits the two intelligent metal characteristics of nickel titanium alloy shape memory effect and super elasticity, and has the flexibility, bending resistance, and fatigue resistance of ropes, which is different from ordinary stainless steel wire rope.

1、 Basic components and structure

(1) Chemical composition: Nickel mass fraction 54.5-57.0%, the rest mainly titanium, with strict control of impurity content; Medical grade meets ASTM F2063 and domestic YY/T medical device standards.

(2)  Twisting structure: Common structures: 1 × 3, 1 × 7, 1 × 19, 7 × 7; The number represents the arrangement of the rope strands, with 1 × 7 being the most commonly used specification. Seven thin wires are twisted in a spiral pattern, providing good flexibility, even load distribution, and strong fatigue resistance.

(3) Diameter range: commonly used 0.15-5   mm, medical use is mostly fine diameter 0.15-1.0   mm; industrial and aviation can reach several millimeters.

(4) Surface: glossy oxidized surface, treated with black oxidation (matte, anti reflective, corrosion-resistant).

Nickel titanium alloy rope 

2、 Core performance

(1) Superelasticity (stress-induced recovery)

Stretching and bending under external force, the maximum elastic strain can reach 8%, and it immediately recovers upon unloading with almost no permanent deformation; The elastic strain of ordinary steel wire is only about 1%, and it is not easy to break after repeated bending. Its fatigue life can reach millions of cycles.

(2) Shape memory effect (thermal drive)

Can deform freely at low temperatures; Heating beyond the transition temperature (Af) causes crystal transformation within the alloy, automatically restoring its pre formed original shape. It can achieve temperature driven contraction and pulling actions and can be used as a micro driver.

>Two supply states:

>- Super elastic state: Af temperature is lower than human/environmental temperature, exhibiting super elasticity at room temperature; Most medical treatments fall into this category.

>- Memory state: Soft and easily deformed at low temperatures, shape recovery triggered by temperature rise.

(3) Biocompatibility

Medical grade nickel titanium rope has no cytotoxicity, is resistant to body fluid corrosion, and can be used for implantable devices. It forms a dense oxide passivation film on the surface and is resistant to salt water and body fluid corrosion.

(4) Other characteristics

-High tensile strength, up to approximately 1200 MPa;

-Flexibility far superior to a single nickel titanium wire, resistant to repeated bending;

-Resistant to seawater, weak acid and weak alkali corrosion;

-The density is about 7.7 g/cm ³, which is higher than the specific strength.

3、 Main application areas

🔹 Medical devices (maximum application direction)

-Endoscopic instruments: gripper, stone retrieval basket, capture ring, wire rope;

-Orthopedics: Orthopedic threading devices, traction cables;

-Interventional instruments: steerable catheter lasso, minimally invasive surgical transmission rope;

>There is already a specialized industry standard for surgical implant nickel titanium rope materials in China.

🔹 Aerospace

Expandable mechanism cable, temperature driven actuator cable, flexible transmission, adaptive structure.

🔹 robot

Biomimetic robotic arm with "artificial muscles" and flexible joint driving ropes, powered by electricity and heating to drive the contraction of nickel titanium ropes to achieve movements.

🔹 industry

Intelligent driving mechanism, shock absorption, high corrosion environment flexible cable, special sensors.

4、 Attention points

(1) The transition temperature Af is a key parameter, and the selection must be confirmed; The performance of Af is completely different for the same nickel titanium rope.

(2)  Medical grade must be selected for medical scenarios, and industrial nickel titanium ropes cannot be directly implanted into the human body.

(3) Although it is resistant to fatigue, excessive deformation and overload can still cause fracture.

(4) The price is much higher than that of ordinary steel wire rope, and it is mostly used in high-end scenarios that require small volume and intelligent deformation.

Pengchengrui Technology Nickel Titanium Alloy Rope in Huizhou City, relying on the unique properties of nickel titanium memory alloy, quickly rebounds after bending, can withstand high-frequency reciprocating deformation, and is resistant to corrosion from body fluids and fresh water, which is different from ordinary stainless steel wire rope. Customizable diameter, twist direction, black oxidation, polished surface treatment as needed, suitable for minimally invasive instrument cables, flexible drive mechanisms, and special transmission components. Factory direct supply, available for small batch samples or mass production, meeting diversified development needs such as medical equipment, intelligent equipment, and scientific research projects.