The cylinder tube is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. The cylinder tube is made of stainless steel, which has the characteristics of small product design and long service life.
Brief introduction of quilted steel pipe
The quilted steel pipe is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. Since the inner and outer walls of the precision steel tube have no oxide layer, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components, such as cylinders or Cylinder, can be seamless pipe. The chemical composition of the quilted steel pipe is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr.
The quilted steel pipe is processed by rolling, because the surface layer has residual compressive stress on the surface, which helps to close the tiny cracks on the surface and hinders the expansion of erosion. Therefore, the corrosion resistance of the surface can be improved, and the generation or expansion of fatigue cracks can be delayed, thereby improving the fatigue strength of the quilted steel pipe. Through rolling forming, a layer of cold work hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the inner wall of the quilted steel pipe and avoiding burns caused by grinding. . After rolling, the reduction of surface roughness value can improve the fit properties.
Rolling processing is a chip-free processing that uses the plastic deformation of metal at room temperature to flatten the microscopic unevenness of the workpiece surface to achieve the purpose of changing the surface structure, mechanical properties, shape and size. Therefore, this method can achieve two purposes of finishing and strengthening at the same time, which cannot be achieved by grinding.
No matter what kind of processing method is used, there will always be fine bump marks on the surface of the part, and the phenomenon of staggered peaks and valleys will appear.
The principle of rolling processing: it is a pressure finishing process, which uses the cold plastic characteristics of metal at room temperature, and uses a rolling tool to apply a certain pressure to the surface of the workpiece, so that the metal on the surface of the workpiece produces plastic flow and fills the original residue. In the low concave trough, the roughness value of the workpiece surface is reduced. Due to the plastic deformation of the rolled surface metal, the surface structure is cold hardened and the grains are thinned, forming a dense fibrous shape, and forming a residual stress layer, the hardness and strength are improved, thereby improving the wear resistance and corrosion resistance of the workpiece surface. Sex and cooperation. Rolling is a non-cutting plastic processing method.
1. Improve the surface roughness, the roughness can basically reach Ra≤0.08µm.
2. Correct the roundness, the ellipticity can be ≤0.01mm.
3. Improve surface hardness, eliminate stress and deformation, and increase hardness by HV≥4°
4. There is a residual stress layer after processing, which improves the fatigue strength by 30%.
5. Improve the quality of fit, reduce wear, and prolong the service life of parts, but the processing cost of parts is reduced.
The difference between quilted steel pipe and seamless steel pipe
1. The main feature of seamless steel pipe is that it has no welded seams and can withstand greater pressure. Products can be very rough as-cast or cold drawn.
2. The quilted steel pipe is a product that has appeared in recent years, mainly because the inner hole and outer wall size have strict tolerances and roughness.
Features of quilted steel pipe
1. The outer diameter is smaller.
2. High precision and small batch production
3. The cold drawn finished product has high precision and good surface quality.
4. The cross-sectional area of the steel pipe is more complicated.
5. The performance of the steel pipe is better and the metal is denser.
The difference after hot-rolled quilted steel pipe
The hot-rolled precision steel pipe is made of continuous casting round tube billet slab or pre-rolled slab as raw material, heated in a walking furnace, descaled by high-pressure water, and then enters the rough rolling mill. , implement computer-controlled rolling, and after final rolling, it is coiled by laminar flow cooling and coiling machine to become straight hair rolls. The head and tail of the straight hair curler are often tongue-shaped and fish-tail-shaped, with poor thickness and width accuracy, and the edges often have defects such as wave shape, folded edge, and tower shape. The coil weight is heavier, and the inner diameter of the steel coil is 760mm. After the straight hair coil is processed by cutting head, tail cutting, edge trimming and multi-pass straightening, leveling and other finishing lines, it is then cut or re-coiled to become: hot-rolled steel plate, flat hot-rolled steel coil, longitudinal Tape and other products. If the hot-rolled finishing coil is pickled to remove the oxide scale and oiled, it becomes a hot-rolled acid-washed coil.
10# 0.07~0.13 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035
20# 0.17~0.23 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035
35# 0.32~0.39 0.17~0.37 0.35~0.65 ≤0.035 ≤0.035
45# 0.42~0.50 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035
40cr 0.37~0.44 0.17~0.37 0.50~0.80 ≤0.035 ≤0.035 0.08~1.10
25Mn 0.22~0.2 0.17~0.37 0.70~1.00 ≤0.035 ≤0.035 ≤0.25
37Mn5 0.30~0.39 0.15~0.30 1.20~1.50 ≤0.015 ≤0.020
cold finished Rm Mpa
cold finished Elonggation
Q:What is your terms of payment?
A:We usually accept T/T in advance, L/C for large sum.If you prefer other payments terms, please discuss.
Q:What is the terms of delivery?
A:EXW, FOB, CIF
Q:What is the terms of packing?
A:Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirements.
Q:What is your delivery time?
A:For products in stock, we can ship it within 7 days after receiving the deposit.For custom order, production time is 15-30
workdays after received the deposit.
Q:Could you produce according to the samples?
A:Yes, we could customer-made by your samples or technique drawings, we could build the mold and fixtures.
Q:Can I place an sample order and what is your MOQ if I accept your quality?
A:Yes, we can send you samples but you may pay the express fees, our MOQ is 1 ton.
Q:How could you guarantee your products?
A:We accept and support the third-party inspection.We also could issue the warranty to customer to guarantee the quality.
Q:Where is the port of shipment?
A:Ningbo or Shanghai sea port.
Q:How can I get the price of needed product?
A:It's the best way if you can send us the material, size and surface, so we can produce for u to check the quality.If you
still have any confusion, just contact us, we would like to be helpful.