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Product Description
The quilted steel pipe is a high-precision steel tube manufactured through cold drawing or hot rolling. Owing to its advantages—such as the absence of oxide layers on both inner and outer walls, no leakage under high pressure, high dimensional accuracy, excellent surface finish, resistance to deformation during cold bending, no flaring, and no cracking during flattening—it is primarily used in producing pneumatic and hydraulic components, including cylinders. Its chemical composition typically includes carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P), and chromium (Cr).
Specifications | Stainless steel square pipe |
Width | 2*2~350*350mm |
Thickness | 0.1mm~35mm |
Length | 2000mm-12000mm etc |
Standard | ASTM、 AISI JIS、 GB. DIN、 EN |
Surface | BA, 2B、 NO.1, NO.4、 4K、 HL, 8K |
Certification | ISO、 SGS, BV |
Grade (ASTM UNS) | 304, 304L 321, 316, 316L, 317L, 347H, 309S, 310S, 904L, S32205,2507, 254SMOS, 32760, S31703, S31603,316Ti, S31635, S31254, N08926, 2205, S32205, S31008, S30908, S32750, S32760, 630etc |
Main advantages of quilted steel pipe:
Enhances surface roughness, achieving a finish of approximately Ra ≤ 0.08 μm.
Improves roundness, maintaining ellipticity within ≤ 0.05 mm.
Increases surface hardness, relieves stress and deformation, and raises hardness by HV ≥ 4°.
Creates a residual stress layer after processing, boosting fatigue strength by about 30%.
Improves fit quality, reduces wear, extends component service life, and at the same time lowers overall processing costs.
Hydraulic steel pipes are generally categorized into fluid pipes and oil-bearing steel tubes used in hydraulic systems, also referred to as honing pipes. Cold-drawn or cold-rolled precision seamless steel pipes are also included within the scope of hydraulic steel pipes.
The fluid pipes used in hydraulic systems closely follow the Chinese national standard GB3639-83. Hydraulic steel pipes are cold-drawn or cold-rolled precision seamless pipes known for their high dimensional accuracy and smooth surface finish, making them suitable for hydraulic equipment. These precision seamless pipes are commonly used to manufacture mechanical structures or hydraulic components. Since they have no oxide layer on either the inner or outer wall, do not leak under high pressure, offer high precision and excellent surface quality, and resist deformation during cold bending, flaring, or flattening, they are widely utilized in the production of pneumatic and hydraulic products.
FAQ：
Q: What products does your company have?
A: Our company produces all kinds of galvanized sheets, coils, tubes, steel strips, galvanized sheets, coils, steel strips, PPGI/PPGL, roof panels, etc. Production experience, support customization.
Q: What are the advantages of your company?
A: (1): Prime quality and Competitive price.
(2): Excellent experiences with after-sale service.
(3): Every process will be checked by responsible QC which insures every product's quality.
(4): Professional packing teams which keep every packing safely.
(5): Samples can be provided as your requirements.
Q: What is your terms of payment ?
A: Can be negotiated by both parties. If you have another question, pls feel free to contact us as below.
Q: What about your price?
A: Our price is very competitive.
Pls feel free to contact us if you are interested in our products.
Q: How long is your delivery time?
A: Stock steel/Steel for simple cutting/Small amount of general standard steel: about 5-20 days for delivery; Custom steel/bulk steel: about 15-30 days for delivery. Contact us for specific delivery times.
