Stainless steel bent pipe is also a kind of stainless steel special-shaped pipe, mainly to distinguish the shape of the pipe after forming, there are U-shaped pipe, J-shaped pipe, S-shaped pipe, 90-degree snake head bend, etc. Stainless steel special-shaped pipes generally have a large moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the weight of the structure and save steel.

At present, high-end stainless steel grades have entered more mainstream and large-scale application fields. Choosing the right bend oil can help improve the efficiency, consistency and success of your bending process.

Picture of the pipe bending machine at work

Stainless steel bending processing method

Push bending method is a commonly used stainless steel pipe fittings bending method, mainly used for pipe bending. According to the characteristics of different bending activities, it can be divided into cold push bending and hot push bending. 1. Cold push bending adopts different bending experimental devices, pushes and bends the pipe blank in an ordinary hydraulic press or crank press, presses the stainless steel straight pipe blank into the mold at room temperature to form a stainless steel elbow, the bending radius of stainless steel elbow suitable for cold push bending becomes smaller, *** small bending radius relative to r≤d≤1, the elbow section ovality is small (≤3%≤5%), the outer pipe wall is gradually thinner (≤9%), the structure is simple, no special equipment is required, production ***, However, the design of stainless steel elbows of different thicknesses requires t≥0.06, otherwise, due to poor stiffness, the billet will often lose stability, resulting in wrinkling or deformation of the elbow. Secondly, under the action of special axial thrust, the bending deformation of the hot push rod shaft expands axially in the circumferential direction, and the small diameter pipe is pushed into the large diameter elbow.

Higher performance requirements for stainless steel alloy elbow oils

One trade-off involved in replacing carbon steel with stainless steel alloys is the difficulty of bending. Most of it is due to an increase in strength and hardness. The physical condition of stainless steel also plays an important role. The surface is smoother than carbon steel, leaving less and thinner bending forming oil when bending. Less lubricant and more surface contact between the substrate and the tool typically translates into more heat, friction, and even cracks or tears. Due to these properties, better performing stainless steel elbow oils have good barrier properties and extreme pressure (EP) protection, and in some cases have smaller molecular sizes, which can help overcome the challenges associated with bending stainless steel pipes.

Higher stainless steel grades can be more challenging in terms of material properties, but they can be bent successfully. In some cases, product designers can design parts to have a long centerline radius (CLR) to reduce bending severity. When the bending radius is small, the processing is difficult, and the performance requirements for the bending and drawing oil are higher.

Wall thickness, outer diameter, centerline radius and bending angle are closely related to each other; To a large extent, it determines the difficulty of the corner.

At the same time, many high-volume suppliers want to get any additional material to save on process costs. This results in a minimum wall thickness (t). The wall coefficient (OD/t) increases, making bending more challenging because the material elongates along the outside of the bend and compresses along the material on the inside (see Figure 1).

Schematic diagram of the bend

The performance of stainless steel elbow oil depends on the difficulty of the bend

Bending D (CLR/OD) is a key factor. As bending D decreases, bending becomes more difficult to achieve successfully. When the bending part D is reduced to less than 1.25, there is an increasing need for better lubrication to withstand the increased frictional loads. Similarly, as the wall coefficient increases, so does the severity of lubrication and requires better lubrication. These two variables, along with the bending angle and surface finish, help determine the best lubrication for stainless steel bends.

Shenzhen Meirunda Lubricants Co., Ltd., a private manufacturer focusing on the field of industrial lubricants for 20 years, can customize products for customers according to the actual application needs of customers.

Choice of stainless steel elbow forming oil?

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