General Information
Length: 1000–12000 mm (Custom lengths available)
Thickness Options:
0.5–100 mm
6–400 mm
1–120 mm
0.15–300 mm
Width Range:
600–2500 mm
600–1250 mm
1.8 m
305 mm / 355 mm / 455 mm / 510 mm
Surface Finish:
Galvanized coated, black painted, PE coated, black finish, or customized
Material Grades:
A36, A283, A387, 1008, 4320, SS400, S235JR
Product Highlights:
High-pressure seamless steel pipe, Q355 seamless carbon pipe, seamless galvanized steel pipe
Payment & Shipping Terms
Minimum Order Quantity: 1 ton
Price: To be negotiated
Packaging:
Kraft paper, wooden case, or customized export packaging
Delivery Time: 10–15 days after deposit
Payment Terms: L/C, T/T
Supply Ability: 8,000 tons per month
Product Description
Seamless Carbon Steel Pipe – High Quality Q355 Series
Q355 is a Chinese low-alloy, high-strength structural steel grade, and the upgraded version of Q345.
According to GB/T 1591-2018, Q355 includes three quality levels:
Q355B
Q355C
Q355D
The meaning of the designation:
Q = "Qu Fu Dian" (Yield Strength in Chinese Pinyin)
355 = Minimum yield strength of 355 MPa (for thickness ≤ 16 mm)
Tensile strength: 470–630 MPa
Density: 7.85 g/cm³
Q355 steel offers excellent weldability, good strength-to-weight ratio, and is widely used in pipelines, machinery, steel structures, and high-load engineering applications.
Chemical Composition of Q355 (Hot Rolled)
| Grade | C ≤ | Si ≤ | Mn ≤ | P ≤ | S ≤ | Cr ≤ | Ni ≤ | Cu ≤ | N ≤ |
|---|---|---|---|---|---|---|---|---|---|
| Q355B | 0.24 | 0.55 | 1.60 | 0.035 | 0.035 | 0.30 | 0.30 | 0.40 | 0.012 |
| Q355C | 0.20 | - | - | 0.030 | 0.030 | - | - | - | 0.012 |
| Q355D | 0.20 | - | - | 0.025 | 0.025 | - | - | - | - |
Carbon Equivalent (CEV)
Based on smelting analysis, hot-rolled delivery condition.
| Grade | d ≤ 30 | 30 < d ≤ 63 | 63 < d ≤ 150 | 150 < d ≤ 250 | 250 < d ≤ 400 |
|---|---|---|---|---|---|
| Q355B | 0.45 | 0.47 | 0.47 | 0.49 | - |
| Q355D | - | - | - | 0.49 | - |
Mechanical Properties (Hot Rolled)
Yield Strength (N/mm²)
| Grade | d ≤16 | 16–40 | 40–63 | 63–80 | 80–100 | 100–150 | 150–200 | 200–250 | 250–400 |
|---|---|---|---|---|---|---|---|---|---|
| Q355B | 355 | 345 | 335 | 325 | 315 | 295 | 285 | 275 | - |
| Q355D | - | 265 | - | - | - | - | - | - | - |
Tensile Strength (N/mm²)
| Grade | d ≤100 | 100–150 | 150–250 | 250–400 |
|---|---|---|---|---|
| Q355B | 470–630 | 450–600 | 450–600 | - |
| Q355D | 450–600 | - | - | - |
Elongation (%)
| Direction | d ≤40 | 40–63 | 63–100 | 100–150 | 150–200 | 250–400 |
|---|---|---|---|---|---|---|
| Horizontal | 20 | 19 | 18 | 18 | 17 | 17 |
| Vertical | 22 | 21 | 20 | 18 | 17 | 17 |
Payment Terms (Extended)
Payment Options: T/T, L/C, Western Union, MoneyGram, PayPal
MOQ: 1 piece / 1 ton
Warranty: 3 years
Packaging:
Export standard packaging (20 ft / 40 ft container, max GW 25 tons)
Customized packing accepted
