| After-sales Service: | We Provide After-Sales Service |
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| Warranty: | 2 Years |
| Type: | Seamless |
| Technique: | Hot Rolled |
| Material: | Carbon Steel |
| Surface Treatment: | Black |
| Samples: |
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| Customization: |
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Suppliers with verified business licenses
Audited Supplier 
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Commodity
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Hot rolled black square and rectangular steel pipe
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Out Diameter
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19x19mm-500x500mm, 20x30mm-400x600mm
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Wall Thickness
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1.3mm-30mm
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Length
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5.8m,6m,11.8m,12m or any length as customer requires
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Tolerance
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OD: ±0.5mm,WT: ±0.2mm, Length:±20mm
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Steel Grade
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Q195-Q355,S195-S355, Gr.A, Gr.B, Gr.C
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Standard
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ASTM A500,EN10210,EN10219,GB/T 6728-2016,AS1163
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welding Technology
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ERW,HFW
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Surface treatment
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pure, oiled, painting
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Straightness
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According To Standard
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Oval Rate
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According To Standard
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Packing:
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Fixed By 6-8 GI steel straps in bundle or wrapped by plastic bags
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Mark
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Marking,Embossing
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Deep Processing
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Punching,Flattening,Bending,Welding,Normalizing,Annealing,Painting
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Application
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Post,Fence,Pole, greenhousE, scaffolding, support , fencing ,conduit
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Advantage
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MOQ 5 ton is acceptable
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weldable,bendable
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Tensile Strength
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According To Standard
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Yield Strength
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According To Standard
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Elongation
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According To Standard
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Storage
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Dry, clean,cover, inside of warehouse against rainy
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Loading / unloading
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Safety,lightly,seriously, protected by helmet & hand gloves
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Payment
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T/T, L/C or as discussion
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Delivery time
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10-30days (as per size and quantity)after received down payment or L/C
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Offer validity
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As per marketing status
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| Product introduction | |||||
| It is a square tube, and many kinds of materials can form a square tube, which is used for what and where. Most square tubes are made of steel pipes, which are unpacked, flattened, curled and welded to form a round tube, and then rolled into a square tube and then cut into the required length. | |||||
| Performance of square tube: | The properties of square tubes mainly include plasticity, fatigue, strength, hardness and impact toughness. 1. Plasticity refers to the ability of metal materials to produce plastic deformation without damage under the action of load, which is a very important parameter to measure the performance of a square pipe, which should not be overlooked when purchasing. 2. Fatigue refers to the fatigue of the square pipe under cyclic load, which affects the service life of the parts. When purchasing the square pipe, choose the product with appropriate fatigue value as needed. 3. Strength refers to the ability of metal materials to resist damage under the action of static load, which is also a matter that needs to be emphasized and paid attention to in many projects. According to the different ways of load action, it can be divided into tensile strength, bending strength, telescopic strength and shear strength. 4. Hardness refers to the degree of hardness of metal materials, and the common expressions of square tube hardness include Rockwell hardness, cloth hardness and Vickers hardness. 5. Impact performance is also an important index, which refers to the ability of metal to resist impact damage under impact load. |
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| The purpose of the square tube: | Square pipes are used in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power generation support, steel structure engineering, electric power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, highway railings, housing construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting and transportation machinery and other welded structural parts with high loads. | ||||
| texture of wood | |||||
| Carbon steel | GB standard | American Standard | Japan | European standard | |
| Q195 | Gr.c | SS330 | S185/0035 | ||
| Q235A | A570 Gr.D | SS400 | S235JR/0038 | ||
| Q235B | Gr.65 | SS400 | S235JR/0038 | ||
| Q235C | Gr.65 | SM400A | S235JO/0114 | ||
| Q235D | Gr.65 | SM400B | S235J2/0114 | ||
| Q345A | |||||
| Q345B | A709 Gr50 | SPFC590 | S335JR | ||
| Q345C | ASTM A572 | E335/0060 | |||
| Q345D | A808M Gr.50 | S355JO/0553 | |||
| Q345E | |||||
| 10# | 1010 | S10C | C10E/1121 | ||
| 20# | 1015 | S20C | C20E/1151 | ||
| 45# | 1045 | S45C | C45E/1191 | ||
| 35# | 1035 | S35C | C35E/1181 | ||
| 15Mn | |||||
| 20Mn | |||||
| 25Mn | |||||
| 45Mn2 | 1340 | SMn443 | |||
| Other special material specifications can be customized for production. | |||||
1. Who are we?
Our headquarters is located in Shandong, China. Since 2002, we have been selling to the domestic market (40.00%), Northern Europe (8.00%), North America (7.00%), the Middle East (7.00%), Africa (6.00%), South America (5.00%), Southeast Asia (5.00%), East Asia (5.00%), South Asia (5.00%), Eastern Europe (3.00%), Western Europe (3.00%), Central America (3.00%), Southern Europe (2.00%), and Oceania (1.00%). There are about 101-200 people in our office.
2. How do we guarantee quality?
Pre-production samples are always available before mass production;
Always carry out final inspection before shipment;
3. What can you buy from us?
Aluminum plate, aluminum coil, aluminum foil, carbon steel, alloy steel, stainless steel, copper galvanizing, etc
4. Why should you buy from us instead of other suppliers?
ZhongYe Metal Products (Shandong) Co., Ltd. is a leading manufacturer of aluminum products and carbon alloy materials in China, with more than 20 years of experience. More than 160 experienced workers use German brand processing equipment for production.
5. What services can we provide?
Accepted delivery conditions: FOB, CIF, FAS, DDP, express, DES;
Accepted payment currencies: US dollar, Australian dollar, Euro and RMB;
Payment types accepted: T/T, L/C, MoneyGram, credit card, PayPal, Western Union remittance, cash;
6. After-sales service: 24-hour online maintenance guidance service.
Language: English, Chinese Other.
Suppliers with verified business licenses
Audited Supplier 
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