Mild Carbon Steel Q235Black welded steel pipe
The main materials are: A36, A333, A355, A537, A572, S235JR, S275JR, SS400, Q235, 4140, 4130, 4340, 1018, 1025, 1045, En8 and En9, etc.
- Email：admin@zhongtangsteel.cn
- WhatsApp：+86 15864006163
1.Are you a manufacturer or just a trader?
We are a manufacturer. We can provide high quality products at competitive prices. Our company also has a trade department. Our company specialized in steel products more than 10 years, so we have established cooperative relationship with many steel enterprises. We can provide many types and specifications of steel products.
2.Could you supply samples?
Sure, samples can be provided free of charge, and buyers pay the freight of the sample.
3.How long does it take you to prepare the goods?
It takes seven to ten days for products under 25 tons, and within 15 days for products of 25-100 tons. Special specifications and large quantity of products will be discussed separately.
4. What is your delivery time?
The time of delivery is usually around 15-20 days. We can send out in 2 days, if it has stock.
5.What is your payment terms?
Our usual payment term is 30% deposit, and rest before delivery. L/C is also acceptable. EXW, FOB, CFR, CIF.
Description
It can produce hot-rolled carbon steel plates and cold-rolled carbon steel plates. There are various types of carbon structural steel plates, easy-to-machine carbon steel plates, boiler steel plates, carbon shipbuilding steel plates, etc.
| Place of Origin | Shandong, China |
| Alloy Or Not | Non-Alloy |
| Technique | ERW |
| Grade | Q195 Q235 Q345 |
| Delivery Time | 15-21 days |
| Application | Fluid Pipe, Structure Pipe |
| Special Pipe | gi pipe |
| Thickness | 0.5 – 12 mm |
| Length | 12M, 6m, 6.4M |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Secondary Or Not | Non-secondary |
| Surface | Galvanized Coated |
| Material | Q235 Q195 |
| Ends | 1.Plain End2. Beveled3.Threaded.4 Screwed |
| Usage | Construction Structure |
| Length | 5.8-12m |
| Shape | Round Shape |
| free sample | yes |
| MOQ | 5 Tons |
What is Q235 Black Welded Steel Pipe?
Q235 black welded steel pipe is a mild carbon steel pipe manufactured by hot-rolled or cold-rolled steel strip through a forming and welding process. The “black” finish refers to the uncoated, dark-colored surface that results from the manufacturing process, which lacks any galvanized or anti-rust coating.
Key Features:
-
Material: Q235 mild carbon steel (equivalent to ASTM A36, S235JR, SS400)
-
Process: Electric resistance welded (ERW) or longitudinal welded
-
Surface: Black / uncoated (mill scale finish)
-
Weldability: Excellent, suitable for various welding processes
-
Formability: Good, easy to cut, bend, and thread
-
Cost-Effective: Lower cost compared to galvanized or seamless pipes
Equivalent Grades:
| Standard | Grade |
|---|---|
| China GB/T | Q235 (Q235A, Q235B) |
| ASTM | A53 Grade B / A36 |
| EN | S235JR (1.0038) |
| JIS | SS400 |
| DIN | St37-2 |
