Welded steel pipe, with its diversified materials, flexible size specifications and a wide range of applications, plays an irreplaceable role in construction, machinery, automobile, shipbuilding, petrochemical and other industries.
Classified by production process
1. High frequency resistance pipe: high frequency resistance welded pipe is a kind of welded pipe that generates heat at the edge of the steel plate through high frequency current, so that the edge of the steel plate is melted and welded together. This kind of welded pipe has high production efficiency, low cost, and is suitable for mass production.
2. Submerged arc pipe: Submerged arc welding pipe is a kind of welded pipe that uses an electric arc to burn under the flux layer and generate high temperature to melt the edge of the steel plate and weld it together. This kind of welded pipe weld quality, good sealing, suitable for the need of high welding quality occasions.
Classification by material
1. Ordinary carbon steel pipe: this is the most common type of welded pipe, mainly made of ordinary carbon steel plate or steel strip rolled. It has good mechanical and welding properties and is suitable for general purpose structural support and fluid transportation.
2. Alloy steel pipe: alloy steel welded pipe adds a small amount of alloy elements on the basis of ordinary carbon steel to improve its strength, hardness, corrosion resistance or high temperature resistance. This type of welded pipe is often used in situations where high pressure or harsh environment is required.
3. Stainless steel pipe: stainless steel welded pipe is mainly made of stainless steel plate or steel strip, with excellent corrosion resistance. It is suitable for fluid delivery systems that require long-term exposure to corrosive environments, such as chemical, food processing, and other industries.
1.ERW:
| Product standards | Steel grade | Outer diameter range mm | Outer diameter tolerances | Opheteness | Wall thickness tolerances | Threaded buckle type | Straightness | Weight tolerances | |||
| API5CT | H40～P110 | 60.3～339.70 | D＜4-1/2 | ±0.79mm | – | -12.5%t
-5%t～+5%t |
vitta | NU、EU、IJ | ≤0.2%L,
Tube ends 1.5m≤3.18mm |
+6.5%/-3.5% | |
| D≥4-1/2 | +1%/-0.5% | casing | STC、LC、BC、XC | ||||||||
| Q/FT 101 | H40、J55、K55
M65、N80、L80 |
114.30～339.70 | D≤9-5/8 | -0.20%～+0.7% | 0.50% | t≤7mm | ±0.2mm | casing | STC、LC、BC、XC | ≤0.2%L,
Tube ends1.5m≤3.0mm |
|
| D≤13-3/8 | -0.30%～+0.85% | 0.40% | T＞7mm | ±0.3mm | |||||||
| C90、C95、
T95、P110 |
114.30～339.70 | D≤9-5/8 | -0.15%～+0.60% | 0.45% | t≤7mm | ±0.2mm | casing | STC、LC、BC、XC | |||
| D≤13-3/8 | -0.25%～+0.75% | 0.35% | t＞7mm | ±0.3mm | |||||||
| FT-T(TT) | 114.30～339.70 | -0.15%/+0.25% | 0.30% | ±0.15mm | casing | FNK-1 | |||||
2.LSAW
| Specification | API 5L PSL 1/PSL2; En10219; A671/A672; ASTM A252 |
| Steel Grade | Grade A; Grade B; X42; X46; X52; X56; X60; X65; X70; X80 and etc. S275JRH; S275J0H; S275J2H; S355JRH; S355J0H; S355J2H; CL10 ~ CL13; CA55; B65; B70; C70; Gr.2/Gr.3; |
| Outside Diameter (O.D.) | 406.4mm ~ 1524mm |
| Wall Thickness | 5.0mm ~ 40mm or more |
| Length | 3M ~ 12.5M |
| Pipe End | Beveled End, Plain ends |
| Surface | Fusion Bond Epoxy Coating; Coal Tar Epoxy; 3PE; Vanish Coating; Bitumen Coating; Black Oil Coating as Per Customer’s requirement |
3.SSAW:
| Specification | API 5L/ASTM A53/EN10217/EN10219 |
| Steel Grade | Grade B/X42/X46/X52…S235JRH/S355… and etc. |
| Outside Diameter | 219.1mm to 3048.0mm (8” to 120”) |
| Wall Thickness | 6.0mm to 25.0mm |
| Length | 3M to 40M or customized |
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