Wholesale supply of easy-cut steel Y15 polished rods, bright round rods, fixed length smooth round, cold drawn special-shaped steel

Brand: Y15 free cutting steel

Standard: GB/T8731-1988

Product process: polishing, grinding, cold drawing

Product shape: round rod, hexagonal rod, square rod, special-shaped material

Free cutting steel uses:

It is used as steel for turning processing and is widely used in structural parts. It is often used to manufacture more important mechanical parts and components such as machine screws, self-tapping screws, bolts, nuts, double-headed parts, headless parts, hexagonal bolts, etc.

Chemical composition:

Carbon C: 0.10～0.18

Silicon Si: ≤0.15

Manganese Mn: 0.80～1.20

Phosphorus P: 0.05～0.10

Sulfur S: 0.23～0.33

Mechanical properties

Tensile strength σb (MPa): (hot rolling) 390～540;

(cold drawn) Diameter 8～20: 530～755; >20～30: 510～735; >30: 490～685

Elongation δ5 (%): (hot rolling) ≥ 22; (cold rolling) ≥ 7.0

Area shrinkage ψ (%): (hot rolling) ≥ 36

Hardness: (hot rolled) ≤ 170HB; (cold drawn steel) 152 ~ 217HB

Performance characteristics of Y15 polishing rod:

1. Good cutting performance: Due to the relatively good sulfur content, the cutting resistance is reduced and chips are easy to chip, which reduces the wear of the tool, can increase the cutting speed and processing efficiency, and reduce the processing cost.

2. Higher surface quality: After polishing, the surface roughness is low, which can meet the requirements of high surface finish of parts.

3. Certain strength and plasticity: It has certain tensile strength and elongation, which can meet the use requirements of general mechanical parts. While ensuring the cutting performance, it can also ensure the reliability of the parts during use.

There are some differences in performance between Y51 polishing rods of different diameters:

1. Mechanical properties 12:

Tensile strength: Generally speaking, the tensile strength of Y15 polished rods with a diameter of 8-20mm is 530-755MPa in the cold drawn state. When the diameter is 20-30mm, the cold-drawn tensile strength is 510-735MPa; the diameter is larger When the thickness is 30mm, the cold tensile strength is 490-685MPa. That is, as the diameter increases, the tensile strength in the cold drawn state tends to decrease.

Elongation and area shrinkage: in the hot-rolled state, the productivity is about ≥22%, and the area shrinkage is ≥36%. The difference in these two indicators between different diameters is not obvious, but in the cold-rolled state, the diameter is smaller The elongation of polished rods is relatively high, such as the cold rolling elongation of 8-20mm diameter ≥ 7.0%, while the elongation of large diameter rods may be slightly lower in the same state.

2. Processing performance:

Cutting performance: Generally speaking, the cutting performance of Y15 polishing rod is better, but during the cutting process of polishing rod with smaller diameter, due to its larger relative surface area, heat dissipation is faster, and the heat generated during cutting is more easily dissipated, so The cutting speed can be faster, and the wear of the props will be relatively smaller. A polishing rod with a larger diameter requires greater cutting force during cutting, which may cause it to wear relatively quickly, and generate more heat during the processing, requiring better cooling measures.

Cold working performance: Y15 polished rods with small diameters are more easily deformed during cold processing. For example, during cold drawing, cold bending and other processing processes, the required processing force is relatively small, and the required shape and dimensional accuracy can be more easily achieved. However, small-diameter polishing rods are also more prone to surface defects, such as scratches and cracks, during cold working. Large-diameter polished rods are more difficult to cold process and require greater equipment power and more complex processing techniques, but they have better dimensional stability after forming.

3. Surface quality:

Typically, Y15 polishing rods provide a good surface finish regardless of diameter. However, during the polishing process, the polishing rod with a smaller diameter has a larger surface curvature, which makes it easier to achieve high-precision surface processing, and the surface roughness can reach a lower value. For large-diameter polishing rods, it is relatively difficult to process to achieve the same surface roughness level, and the requirements for polishing equipment and processes are higher.

4. Wear resistance:

Wear resistance is related to the hardness, organizational structure and other factors of the material. Although the Y15 polishing rods are made of the same material, the different diameters may result in slight differences in their organizational structure during the production process. Generally speaking, polished rods with larger diameters may show better wear resistance during use. This is because the internal structure of large-diameter rods may be denser and defects are relatively smaller during rolling or cold drawing. less, thus being more resistant to wear during friction. However, if the polishing rod with a smaller diameter undergoes special surface treatment, such as quenching, carburizing, etc., its surface hardness can be significantly improved, and thus its wear resistance may be better than that of an untreated large-diameter polishing rod.

How to choose a suitable steel rod when making springs：

1, Look at the material:

High carbon steel: with high hardness and wear resistance, suitable for mining, construction and other high wear environment;

Alloy steel: Added alloy elements on the basis of carbon steel, improve the strength and wear resistance, suitable for high-load, high-wear working environment;

Stainless steel: has a corrosion resistance and wear resistance, suitable for harsh environments, while having a beautiful appearance.

2, Look at the specifications and sizes:

Ensure that the diameter, length, roundness and other dimensions of the steel rod meet the standard requirements.

3, Look at the surface quality:

Select steel rods with smooth surfaces, no cracks and no folding to ensure good surface quality.

4, Look at the mechanical properties:

Select steel rods that meet the mechanical properties requirements according to the needs to ensure that their strength and toughness meet the requirements of use.

5, Sifferent materials of steel rod application scenarios:

High carbon steel: suitable for mining, construction and other high wear environment.

Alloy steel ‌ : suitable for high load, high wear working environment, such as crusher, screen and other equipment wear-resistant parts.

Stainless steel ‌ : suitable for corrosion resistance and aesthetic requirements of higher occasions, such as gears, bearings and other mechanical parts ‌.

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