Seamless steel pipes can be divided into round pipes and special-shaped pipes according to the section shape. Circular steel pipes are widely used, but there are also some special-shaped steel pipes such as square, rectangular, semicircle, hexagon, equilateral triangle, octagon, etc.
For steel pipes that are subjected to fluid pressure, hydraulic tests are required to verify their pressure resistance and quality. It is considered qualified if there is no leakage, wetting, or expansion under the specified pressure. Some steel pipes also need to undergo edge rolling tests, expansion tests, flattening tests, etc. according to standards or the requirements of the purchaser.
Seamless stainless steel pipes, also known as stainless steel seamless pipes, are made by piercing steel ingots or solid pipe blanks into capillary tubes, which are then hot rolled, cold rolled, or cold drawn.

Metals can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on ordinary carbon steel will continue to oxidize, causing corrosion to expand and ultimately forming pores. This can be achieved by electroplating with paint or oxidation resistant metal to protect the surface of carbon steel, but this protective layer is only a thin film. If the protective layer is damaged, the steel below will begin to rust again. Whether stainless steel pipes are corroded is related to the chromium content in the steel. When the chromium content in the steel reaches 12%, a layer of passive and dense chromium rich oxide is formed on the surface of stainless steel pipes in the atmosphere to protect the surface and prevent further oxidation. This type of oxide layer is extremely thin, through which the natural luster of the steel surface can be seen, giving stainless steel a unique surface. If the chromium film is damaged, the chromium in the steel and the oxygen in the atmosphere will regenerate a passivation film, continuing to play a protective role. In some special environments, stainless steel may also experience localized corrosion and failure, but unlike carbon steel, stainless steel does not exhibit uniform corrosion and failure

1. Who are we?
Our headquarter is located in Shandong, China. Since 2023, we have sold to North America (60.00%), Western Europe (14.00%) and South America (6.00%). There are about 11-50 people in our office.

2. How do we guarantee quality?
Always provide pre-production samples before mass production;
Always carry out final inspection before shipment;

3. What can you buy from us?
Copper, aluminum, die steel, titanium, customized machine parts
4. Why should you buy from us instead of other suppliers?
The company has 25 years of production experience. It has advanced precision production equipment, modern large warehouse, 200000 tons of inventory goods and a number of long-term stable cooperative customers.

5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW
Accepted payment currency: US dollar, Euro, Japanese yen, Canadian dollar, Australian dollar, Hong Kong dollar, British pound, RMB, Swiss franc;
Accepted payment type: T/T, L/C, D/P D/A, PayPal;
Optional ports: Tianjin, Shanghai, Guangzhou;
Spoken: English, Chinese

6. How can we get your price?
A. We need the following information to quote for you:
1).  Product Name
2).  standard
3).  Material grade (chemical composition)
4).  dimension
5).  amount
6).  Special part drawing