Complaint
Seamless rectangular steel pipe is a square, rectangular steel pipe with a hollow section and no seams around it. Seamless steel pipes are made from steel ingots or solid tube blanks that are perforated into tubes, and then hot rolled, cold rolled, or cold drawn. Seamless steel pipes have a hollow cross-section and are widely used as pipelines for conveying fluids. Compared to solid steels such as round steel, steel pipes have a lower weight and the same flexural and torsional strength. They are a type of economical cross-section steel, and are widely used in the manufacture of structural and mechanical components such as petroleum drill pipes, automotive transmission shafts, bicycle racks, and steel scaffolds used in construction.
classification:
Square tubes are divided into:
Hot rolled seamless square tubes, cold drawn seamless square tubes, extruded seamless square tubes, welded square tubes
Square tubes are divided by surface treatment:
Hot-dip galvanized square tubes, electrogalvanized square tubes, oiled square tubes, and pickled square tubes
Square tubes are classified by wall thickness:
Ultra thick wall square tube, thick wall square tube, thin wall square tube
| component | C | Si | Mn | P | S | Cr | Ni | Cu | As |
| minimum value | - | - | - | - | - | - | - | - | - |
| Maximum value | 0.2 | 0.35 | 1.4 | 0.045 | 0.045 | 0.3 | 0.3 | 0.3 | 0.08 |
| GB | ISC | CNS | JIS | KS | ASTM | UNS | ISO | DIN EN/DIN | W-Nr. | NF EN/NF | GOST | SS | BS EN/BS |
| Q235A Q235B Q235C Q235D (A3) (C3) | U12352 U12355 U12358 U12359 | SS400 | SS400 (SS41) | SS400 | A570 Gr.A A570 Gr.D A283M Gr.D | K02501 K02502 | Fe360A Fe360D | S235JR S235JRG1 S235JRG2 (St37-2) (USt37-2) (RSt37-2) | 1.0037 1.0036 1.0038 | S235JR S235JRG1 S235JRG2 (E24-2) (E24-2NE) | Ст3кп-2 Ст3кп-3 Ст3кп-4 БСт3кп-2 | 1311 1312 | S235JR S235JRG1 S235JRG2 (40B) (C) |
| GB | JIS | ASTM | ISO | DIN EN/DIN | NF EN/NF | EN | Digital brand | GOST | SS | BS EN/BS |
| Q235C | SS330 | Gr.36 | Fe360B | RSt37-2 S235JRG2 | E24-2NE | S235JRG2 Fe360BFN | 1.0038 | St3ps St3sp | 1312-00 | 40B |
| seamless square steel pipe | ||
| Size | Outside Diameter | Wall Thickness |
| 50x50-1000x1000mm | 5-20mmmm | |
| Tolerace | +/-5% | +/-5% |
| Standard | GB | GB/T 8162 GB/T 8163 etc. |
| DIN | 10#(ST37-2,ST35-8),20#(ST42,ST45-4/8),45#(DINCK45) | |
| JIS | 10#(STPG38,STS38,),20#(STPG42)45#(JIS S45C) | |
| ASTM/AISI | 10# /20#(ASTM a106/53 Gr.B ),45#(AISI1045) | |
| Length | 1-12m, or require by clients | |
| Method | cold drawing, hot rolling or hot expanding | |
| Min order | 5 tons, more quantity price will be lower | |
| Surface | Galvanized, 3PE, painting, coating oil, steel stamp, drilling, etc | |
| Ends | Plain ends, cutting, threading, beveled, flange, etc | |
The uses of square tubes include construction, machinery manufacturing, steel construction, and other projects, shipbuilding, solar power generation support, steel structural engineering, electrical engineering, power plants, agricultural and chemical machinery glass curtain walls, automotive chassis, airports, boiler construction, highway railings, housing construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting and transportation machinery, and other welding structures with high loads.
| +C(BK) | Cold drawn/hard.After the last cold forming,no heat treatment. |
| +LC(BKW) | Cold drawn/soft.After the last heat treatment follows the cold drawing there is a light finishing pass. |
| +SR(BKS) | Cold drawn and stress relieved annealed. After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere. |
| +A(GBK) | After the final cold drawing process the tubes are stress relieved annealed in a controlled atmosphere. |
| +N(NBK) | Normalized. After the last cold drawing process the tubes are annealed in a controlled atmosphere. |
1. Who are we?
Our headquarter is located in Shandong, China. Since 2022, 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 drawin
