The seamless steel pipe is made by perforating the whole round steel, and the steel pipe without weld seam on the surface is called seamless steel pipe. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and pipe jacking. According to the cross-sectional shape, seamless steel tubes are divided into two types: round and special-shaped, and special-shaped tubes have various complex shapes such as square, oval, triangular, hexagonal, melon-shaped, star-shaped, and finned tubes. The maximum diameter is up to 900mm and the minimum diameter is 4mm. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.
Uses of seamless steel pipes:
1. General-purpose seamless steel pipes are rolled from ordinary carbon structural steels, low-alloy structural steels or alloy structural steels, with the largest output, and are mainly used as pipes or structural parts for conveying fluids.
2. According to different purposes, there are three types of supply:
a. Supply according to chemical composition and mechanical properties;
b. Supply according to mechanical properties;
c. Supply according to hydraulic test. Steel pipes supplied by Types a and b, if used to withstand liquid pressure, are also subject to hydrostatic testing.
3. There are many kinds of seamless pipes for special purposes, such as seamless pipes for boilers, seamless pipes for chemical power, seamless steel pipes for geological use and seamless pipes for petroleum.
Seamless steel pipes have a hollow cross-section and are widely used as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same, and it is an economical section steel.
Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolds used in construction, etc. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing processes, and save materials and processing Man-hours have been widely used to manufacture steel pipes.
Seamless steel pipe production process:
1.Main production process of hot-rolled seamless steel pipe (△Main inspection process):
Tube billet preparation and inspection△→tube billet heating→piercing→pipe rolling→pipe tube reheating→diameter setting (reduction)→heat treatment△→finished tube straightening→finishing→inspection△(non-destructive, physical and chemical, bench inspection)→warehousing
2.Main production process of cold-rolled (drawn) seamless steel pipe:
Billet preparation→pickling and lubrication→cold rolling (drawing)→heat treatment→straightening→finishing→inspection
The production process of general seamless steel pipe can be divided into cold drawing and hot rolling. The production process of cold rolling seamless steel pipe is generally more complicated than hot rolling. Sizing test, if the surface does not respond to cracks, the round pipe will be cut by a cutting machine, and cut into a billet with a length of about one meter. Then enter the annealing process. Annealing should be pickled with acidic liquid. When pickling, pay attention to whether there is a large amount of foaming on the surface. If there is a large amount of foaming, it means that the quality of the steel pipe cannot meet the corresponding standards. In appearance, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe. The wall thickness of the cold-rolled seamless steel pipe is generally smaller than that of the hot-rolled seamless steel pipe, but the surface looks brighter than the thick-walled seamless steel pipe. Much rougher, and the caliber does not have too many burrs.
The delivery state of hot-rolled seamless steel pipes is generally delivered after heat treatment in the hot-rolled state. After passing the quality inspection, the hot-rolled seamless steel pipe must be strictly hand-selected by the staff. After the quality inspection, the surface must be oiled, followed by multiple cold-drawing experiments, and the perforation experiment must be carried out after the hot-rolling treatment. , If the perforation diameter is too large, it will be straightened and corrected. After straightening, it is sent to the flaw detector by the transmission device for flaw detection test, and finally it is labeled, arranged in specifications and placed in the warehouse.
The outer diameter of hot-rolled seamless pipe is generally greater than 32mm, and the wall thickness is 2.5-200mm. The outer diameter of cold-rolled seamless steel pipe can reach 6mm, and the wall thickness can reach 0.25mm. Rolling has higher dimensional accuracy than hot rolling.
Zhengde hot-rolled seamless steel pipe is a long strip of steel with a hollow section and no joints around it. The steel pipe has a hollow cross-section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength is the same. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes and automobile transmission shafts. , bicycle racks and steel scaffolding used in building construction, etc. The use of seamless steel pipes to manufacture ring parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipes. Hot-rolled seamless steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes.
thick
Φ |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
6.5 |
7 |
8 |
8.5 |
9 |
10 |
12 |
| 32 |
2.146 |
2.46 |
2.762 |
3.052 |
3.329 |
3.594 |
3.847 |
4.088 |
|
|
|
|
|
|
| 38 |
2.589 |
2.978 |
3.354 |
3.718 |
4.069 |
4.408 |
4.735 |
5.049 |
|
|
|
|
|
|
| 42 |
2.885 |
3.323 |
3.749 |
4.162 |
4.562 |
4.951 |
5.327 |
5.691 |
|
|
|
|
|
|
| 45 |
3.107 |
3.582 |
4.044 |
4.495 |
4.932 |
5.358 |
5.771 |
6.172 |
|
|
|
|
|
|
| 50 |
3.477 |
4.014 |
4.538 |
5.049 |
5.549 |
6.036 |
6.511 |
6.973 |
7.423 |
8.286 |
8.699 |
|
|
|
| 54 |
3.773 |
4.359 |
4.932 |
5.493 |
6.042 |
6.578 |
7.103 |
7.614 |
8.114 |
9.075 |
9.538 |
|
|
|
| 57 |
3.995 |
4.618 |
5.228 |
5.826 |
6.412 |
6.985 |
7.546 |
8.095 |
8.632 |
9.667 |
10.167 |
|
|
|
| 60 |
4.217 |
4.877 |
5.524 |
6.159 |
6.782 |
7.392 |
7.99 |
8.576 |
9.149 |
10.259 |
10.796 |
|
|
|
| 63.5 |
4.476 |
5.179 |
5.869 |
6.548 |
7.214 |
7.867 |
8.508 |
9.137 |
9.754 |
10.95 |
11.529 |
|
|
|
| 68 |
4.809 |
5.567 |
6.313 |
7.047 |
7.768 |
8.477 |
9.174 |
9.858 |
10.53 |
11.838 |
12.473 |
|
|
|
| 70 |
4.957 |
5.74 |
6.511 |
7.269 |
8.015 |
8.749 |
9.47 |
10.179 |
10.876 |
12.232 |
12.892 |
13.539 |
14.797 |
17.164 |
| 73 |
5.179 |
5.999 |
6.807 |
7.602 |
8.385 |
9.156 |
9.914 |
10.66 |
11.394 |
12.824 |
13.521 |
14.205 |
15.537 |
18.052 |
| 76 |
5.401 |
6.258 |
7.103 |
7.935 |
8.755 |
9.563 |
10.358 |
11.141 |
11.912 |
13.416 |
14.15 |
14.871 |
16.277 |
18.94 |
| 89 |
6.363 |
7.38 |
8.385 |
9.378 |
10.358 |
11.326 |
12.281 |
13.225 |
14.156 |
15.981 |
16.875 |
17.756 |
19.483 |
22.787 |
| 108 |
7.768 |
9.02 |
10.259 |
11.486 |
12.701 |
13.903 |
15.093 |
16.27 |
17.436 |
19.729 |
20.858 |
21.973 |
24.168 |
28.41 |
| 133 |
|
11.178 |
12.725 |
14.261 |
15.783 |
17.294 |
18.792 |
20.278 |
21.751 |
24.662 |
26.098 |
27.522 |
30.334 |
35.809 |
| 159 |
|
13.422 |
15.29 |
17.146 |
18.989 |
20.821 |
22.639 |
24.446 |
26.24 |
29.791 |
31.548 |
33.293 |
36.746 |
43.503 |
| 219 |
|
18.601 |
21.209 |
23.805 |
26.388 |
28.959 |
31.517 |
34.064 |
36.598 |
41.629 |
44.126 |
46.61 |
51.543 |
61.259 |
| 273 |
|
23.262 |
26.536 |
29.797 |
33.046 |
36.283 |
39.508 |
42.72 |
45.92 |
52.283 |
55.445 |
58.596 |
64.86 |
77.24 |
| 325 |
|
27.75 |
31.665 |
35.568 |
39.458 |
43.337 |
47.202 |
51.056 |
54.897 |
62.542 |
66.346 |
70.137 |
77.684 |
92.629 |
| 355 |
|
|
|
38.897 |
43.158 |
47.406 |
51.641 |
55.865 |
60.076 |
68.46 |
72.634 |
76.796 |
85.082 |
101.507 |
| 377 |
|
|
|
41.339 |
45.871 |
50.39 |
54.897 |
59.391 |
63.873 |
72.801 |
77.246 |
81.679 |
90.508 |
108.018 |
| 426 |
|
|
|
46.777 |
51.913 |
57.036 |
62.147 |
67.246 |
72.332 |
82.468 |
87.518 |
92.555 |
102.592 |
122.519 |
| 450 |
|
|
|
|
|
|
|
71.093 |
76.475 |
87.203 |
92.549 |
97.882 |
108.511 |
129.621 |
| 480 |
|
|
|
|
|
|
|
75.902 |
81.654 |
93.122 |
98.837 |
104.54 |
115.909 |
138.499 |
| 530 |
|
|
|
|
|
|
|
83.917 |
90.286 |
102.987 |
109.319 |
115.638 |
128.24 |
153.296 |
| 630 |
|
|
|
|
|
|
|
99.947 |
107.549 |
122.716 |
130.281 |
137.833 |
152.902 |
182.89 |
Our Advantages
Three-roll pipe mill
The seamless steel pipe produced by the three-roll mill for hot-rolling seamless steel pipe has high precision. Because of the cross-rolling with the mandrel, the rolling action is repeated many times in one pass, which greatly improves the accuracy of the wall thickness and is not easy to produce. Defects such as scratches, ears, and green lines; the flexibility in production is large, and the pass size can be changed with the help of the clutch of the roll.
Adequate inventory
Standing inventory of carbon seamless tubes, seamless special-shaped tubes, alloy seamless tubes, precision tubes. Various types of seamless steel pipes with a specification of 5-426*0.5-60mm and a length of 2-16m. The cold-rolled precision bright tubes produced by our factory have smooth appearance, uniform wall thickness, no oxide layer, and high precision. The inner hole of the steel pipe can be divided into round type, spline type, plum blossom type, etc. It is widely used in automobiles, motorcycles, electric power, petrochemicals, ships, aerospace, bearings, pneumatic components, oil cylinders, boiler equipment, medical equipment, fitness equipment and other industries.
Attention to detail
No matter how to choose the hot-rolled seamless steel pipe, its quality cannot be ignored. It must be noted that there should be no defects on the surface, such as small cracks or scars, etc., and that the thickness of the pipe wall is the same to ensure uniformity. The physical comparison is still very important. Only after the basic comparison of the physical objects is done, can the steel pipes that meet the needs be selected. The processing technology of each seamless steel pipe is different, which will also affect its application field. Now it is generally processed by cold drawing and hot rolling, and the processing effect of the two and the application of steel pipes will also have certain differences.
Applicable scene
Hot-rolled seamless pipes specifically include low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, seamless steel pipes for ships, petroleum cracking steel pipes, seamless steel pipes for high-pressure fertilizer equipment, oil jacket steel pipes, pipeline steel pipes, hollow sucker rods, and ordinary fluid steel pipes. , structural seamless steel pipes and imported alloy steel pipes, etc., with rich varieties and complete specifications, widely used in petroleum, chemical, electric power, boilers, ships, machinery and other industries, and have been sold all over the world.
Quality first: production and inspection in strict accordance with production standards;
Price advantage: discounts based on real market prices;
Transaction security: There will be no loss of customer funds;
After-sales guarantee: the customer's problem is our problem;
Long-term cooperation: quality assurance, price advantage, sincere service can last for a long time.
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Company Profile
Shandong Zhengde Metal Manufacturing Co., Ltd. is a production and sales company integrating hot-rolled steel coils, cold-rolled steel coils, galvanized steel coils, color-coated steel coils, section steel, steel pipes, steel wires, metal mesh, stainless steel, aluminum, copper and other metal products integrated large enterprises. Five production and sales bases have been formed in Binzhou, Liaocheng, Wuxi, Tianjin, Jinan and Tai'an, with more than 100 production lines, 4 nationally recognized laboratories, 2 technical engineering centers, and 5 enterprise technology centers. Products are exported to more than 50 countries and regions such as North America, South America, Europe, Africa, Oceania, Middle East, and Southeast Asia.
Certifications
Audited Supplier 
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