EFW ERW Single Double Seam Welded Pipe
EFW ERW Single Double Seam Welded Pipe
Quick detail:
Single Seam: Outside Diameter 6-914mm Wall thickness 0.5-60mm
Double Seams:Outside Diameter 630-1524mm Wall thickness 2-80mm
Circular Seam:Outside Diameter 630 mm above Wall thickness 2-100
Material
SUS 304,TP304 SUS304L TP304L SUS316 TP316 SUS316 TP316L.
Calculation Formula
0.02491
0.02482
0.02513
Application : Electric Power
Oil Refining
Nuclear Power
Drinking Water
Offshore Engineering &Shipbuilding
Natural Gas
Paper making
Construction
Description:
LARGE DIAMETER PIPE Available material
| Material | |
| Austenitic Stainless Steel | 310S, 309S,316L,321,304L,304 |
| Duplex | S,32750,S32760,S31803,S32205 |
| Nickel-Base Alloy | N08904,N06600,N08825 |
| Copper Nickel Alloy | C70600,C70620 |
| Ferrite | 430,409L |
| Other Special Material | 254SMO,253MA |
| High-Temp Material | 310S,309S,S30815 |
| Titanium Alloys | TA2,TA10,TC4 |
Production process:
Steel Coil
Re-test
Flat Open and Transverse Shear
Shear Longitudinal Shear
Edge Planning and Milling
Butt Welding of plate
Forming(Bending/Reeling)
End Squaring&Tack Welding
Welding Seam Cleaning
Automatic welding
Radiographic Test
Solution Treatment
Rounding
Straightening
End Facing Treatment
Hydrostatic Test
Pickling Passivation
Rinse and Dry
Radiographic Test
Finished Production Testing
Marking
Packing
Finished Product Warehousing
Shipping
Standard:
GB/T 12771
Delivery condition:
Heat treatment
Welded
| Standard | Item | Outside Diameter | Thickness | Roundness
| Straightness | Length | ||
| GB/T 12771 | Heat treatment | High Class | General | |||||
| ＜50 | ±0.20 | ±0.3 | ＞0.5-1.0,±0.15 ＞1.0-2.0 ±0.20 ＞2.0-4.0 ±0.3 ±10% | Not exceed the OD tolerance t/D≤3% ≤1.5%D | OD ≤ 108 mm,≤1.5mm/m ＞ 108-325mm ≤2.0mm/m ＞ 325mm ≤2.5mm/m
| 3000-9000mm, Length tolerance is 0,+20mm
| ||
| ≥40-＜65 | ±0.30 | ±0.40 | ||||||
| ≥65-＜90 | ±0.40 | ±0.50 | ||||||
| ≥90-＜168.3 | ±0.80 | ±1.0 | ||||||
| ＞168.3-＜325 | ±0.75% D | ±1% D | ||||||
| ≥325-＜610 | ±0.6% D | ±1% D | ||||||
| ＞610 | ±0.6% D | ±0.7% or± 10 Chose min value | ||||||
| Welded | All sizes | ±0.5% D or ±0.20 chose the bigger one | ±0.75% D or ±0.30 chose the bigger one | |||||
Product Pictures
Company Introduction
QUALITY CONTROL
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing and Cold Rolling, on line inspection
5. Heat Treatment, +A, +SRA, +LC, +N, Q+T
6. Straightening-Cutting to specified length-Finished Measuring Inspection
7. Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8. Packing and Stocking
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.