Q235 & Q345 spiral welded pipes for sale
specification
|
Product Name |
Q235, Q345 spiral welded pipe |
|
Standard |
ASTM,JIS,DIN,GB,AISI,DIN,EN |
|
Material |
Q235、Q345、A36、S235JR、SS400、St37-2、A572 Gr.50、A992、S355JR、EN 10025-2、SM490、S355J2 |
|
Outer diameter range |
Small diameter: The outer diameter is generally less than 219mm (about 8 inches). Medium Diameter: The outer diameter usually ranges from 219mm (about 8 inches) to 800mm (about 32 inches). Large diameter: The outer diameter is generally above 800mm (about 32 inches), and the common ones are 1000mm (about 40 inches), 1200mm (about 48 inches), etc., and can even reach 2000mm (about 80 inches) or larger. |
|
Thickness range |
Small diameter spiral welded pipe: The wall thickness is generally between 3mm and 10mm. Medium diameter spiral welded pipe: wall thickness is usually between 5mm and 20mm. Large diameter spiral welded pipe: The wall thickness can be from 6mm to 25mm or even thicker, depending on the design requirements and use environment. |
|
Length range |
The longest length is 12 meters, and can be customized by customers |
|
Error |
±1% |
|
Certification |
ISO 9001 ，CE，API |
|
Surface treatment |
Hot dip galvanizing, cold dip galvanizing, spraying, anti-corrosion coating, shot blasting, sand blasting, phosphating |
|
Country of origin |
China |
|
Main Applications |
1.Construction Engineering: Q235 spiral welded pipes are often used in building structures, such as frames, supports and infrastructure. |
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2.Mechanical manufacturing: Used as structural parts in some mechanical equipment. |
|
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3.High-strength structure: Q345 spiral welded pipe is widely used in high-strength structures such as bridges, towers and large buildings due to its high strength and toughness. |
|
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4.Power engineering: used in places with high strength requirements such as power towers and transmission lines. |
|
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5.Mining and metallurgical industry: used as support and transportation pipelines in mining, metallurgy and other industries. |
|
|
Package |
Simple packaging, reinforced packaging, wooden frame, metal frame, pallet, wrapping |
|
Payment Term |
TT, LC,Cash, Paypal, DP, DA,Western Union or Others. |
|
After-sales service |
1. Quality assurance period 2. Return and exchange policy 3. Delivery and acceptance assistance 4. Customer feedback collection |
Product Display
Chemical Composition
|
MATERIAL |
GRADE |
C（%） |
Si（%） |
Mn（%） |
P（%） |
S（%） |
V（%） |
Nb（%） |
Ti（%） |
Cr（%） |
Ni（%） |
Cu（%） |
Al（%） |
N（%） |
Mo（%） |
B（%） |
|
Q235 |
A |
0.14-0.22 |
0.30 |
0.30-0.65 |
0.045 |
0.050 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Q235 |
B |
0.12-0.20 |
0.30 |
0.30-0.70 |
0.045 |
0.045 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Q235 |
C |
0.18 |
0.35 |
0.80 |
0.040 |
0.040 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Q235 |
D |
0.17 |
0.035 |
0.035 |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Q345 |
A |
≤0.20 |
≤0.50 |
≤1.70 |
≤0.035 |
≤0.035 |
≤0.15 |
≤0.07 |
- |
≤0.20 |
≤0.30 |
≤0.30 |
- |
- |
- |
- |
|
Q345 |
B |
≤0.20 |
≤0.50 |
≤1.70 |
≤0.035 |
0.035 |
≤0.15 |
≤0.07 |
- |
≤0.20 |
≤0.30 |
≤0.30 |
- |
- |
- |
- |
|
Q345 |
C |
≤0.20 |
≤0.50 |
≤1.70 |
≤0.030 |
≤0.030 |
≤0.15 |
≤0.07 |
≥0.015 |
≤0.20 |
≤0.30 |
≤0.30 |
- |
- |
- |
- |
|
Q345 |
D |
0.18 |
≤0.50 |
≤1.70 |
≤0.030 |
≤0.025 |
≤0.15 |
≤0.07 |
≥0.015 |
≤0.20 |
≤0.30 |
≤0.30 |
- |
- |
- |
- |
|
Q345 |
E |
≤0.18 |
≤0.50 |
≤1.70 |
≤0.025 |
≤0.020 |
≤0.15 |
≤0.07 |
≥0.015 |
≤0.20 |
≤0.30 |
≤0.30 |
- |
- |
- |
- |
Mechanical Properties
|
Properties |
Q235 |
Q345 |
|
Yield Strength MPa (for thickness or diameter ≤ 16mm) |
235 |
345 |
|
Yield Strength MPa (for 16mm < thickness/diameter ≤ 40mm) |
225 |
325 |
|
Yield Strength MPa (for 40mm < thickness/diameter ≤ 60mm) |
215 |
315 |
|
Yield Strength MPa (for 60mm < thickness/diameter ≤ 100mm) |
205 |
305 |
|
Yield Strength MPa (for 100mm < thickness/diameter ≤ 150mm) |
195 |
295 |
|
Yield Strength MPa (for 150mm < thickness/diameter ≤ 200mm) |
185 |
285 |
|
Tensile Strength MPa |
375 - 500 |
470 - 630 |
|
Elongation δ5/% (for a ≤ 16mm) |
≥26 |
≥21 |
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Elongation δ5/% (for 16mm < a ≤ 40mm) |
≥25 |
≥20 |
|
Elongation δ5/% (for 40mm < a ≤ 60mm) |
≥24 |
≥19 |
|
Elongation δ5/% (for 60mm < a ≤ 100mm) |
≥23 |
≥18 |
|
Elongation δ5/% (for 100mm < a ≤ 150mm) |
≥22 |
≥17 |
|
Elongation δ5/% (for 150mm < a ≤ 200mm) |
≥21 |
≥16 |
|
Impact Test Temperature for Q235A |
No requirement |
- |
|
Impact Test Temperature for Q235B |
Room temperature (20°C) |
- |
|
Impact Test Temperature for Q235C |
0°C |
- |
|
Impact Test Temperature for Q235D |
-20°C |
- |
|
Impact Work Akv/J for Q235B, Q235C, Q235D |
≥27 |
- |
|
Poisson's Ratio ν |
0.25 - 0.33 |
0.25 - 0.33 |
|
Elastic Modulus E/GPa |
200 - 210 |
200 - 210 |
Production process
1.Raw materials preparation
Steel Coil Purchasing: Choose hot-rolled or cold-rolled steel coils that meet the standards as raw materials.
Inspection: Quality inspection of steel coils to ensure that their chemical composition and physical properties meet the requirements.
2.Cutting and forming
Shearing: Cut the steel coil into steel strips of required width.
Forming: The steel strip is curled into a spiral shape by a forming machine to form the preliminary shape of the pipe.
3.Welding
Welding preparation: Edge processing of the formed steel strip to ensure welding quality.
Spiral welding: Welding is done using automatic welding equipment, usually using welding processes such as submerged arc welding or gas shielded welding.
4.Cooling and Inspection
Cooling: After welding, the pipe needs to be cooled naturally or with water to reduce welding stress.
Inspection: Perform non-destructive testing (such as ultrasonic testing, X-ray testing, etc.) on welded joints to ensure welding quality.
5.Surface treatment
Oxide removal: Remove oxides and impurities on the pipe surface by sand blasting, shot blasting, etc.
Anti-corrosion treatment: Hot-dip galvanizing, spraying or other anti-corrosion treatments as required.
6.Finished product inspection and packaging
Dimensional inspection: Inspect the finished product for dimensions such as outer diameter and wall thickness.
Performance Testing: Conduct stress testing and other performance tests to ensure that the product meets the standards.
Packaging: Qualified spiral welded pipes are marked and packaged, ready for shipment.
7.Shipping
Logistics arrangement: Arrange transportation according to customer needs and deliver the products to the designated location.