OUR PRODUCTS

ERW (Electric Resistance Welded ) Steel Pipe, HFW (High-Frequency Welding) Steel Pipe, ERW Casing, ERW Carbon Steel Pipe

Standard: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.

ERW Pipe

Tolerance of Outside Diameter

Standard Out Diameter Tolerance of Pipe End Tolerance of Pipe Body
API 5L 219.1~273.1 +1.6mm, -0.4mm ±0.75%
274.0~320 +2.4mm, -0.8mm ±0.75%
323.9~457 +2.4mm, -0.8mm ±0.75%
508 +2.4mm, -0.8mm ±0.75%
559~610 +2.4mm, -0.8mm ±0.75%

Tolerance of Wall Thickness

Standard Grade Out Diameter Wall Thickness
API 5L A 219.1~457 +15%, -12.5%
B 508~610 +17.5%, -12.5%
X42-X80 508~610 +19.5%, -8%
Chemical Analysis and Mechanical Properties
Standard Class Grade Chemical Analysis(%) Mechanical Properties(min)(Mpa)
C Mn P S Tensile Strength Yield Strength
API 5L PSL1 B 0.26 1.20 0.030 0.030 414 241
X42 0.26 1.30 0.030 0.030 414 290
X46 0.26 1.40 0.030 0.030 434 317
X52 0.26 1.40 0.030 0.030 455 359
X56 0.26 1.40 0.030 0.030 490 386
X60 0.26 1.40 0.030 0.030 517 414
X65 0.26 1.45 0.030 0.030 531 448
X70 0.26 1.65 0.030 0.030 565 483
PSL2 B 0.22 1.20 0.025 0.015 414 241
X42 0.22 1.30 0.025 0.015 414 290
X46 0.22 1.40 0.025 0.015 434 317
X52 0.22 1.40 0.025 0.015 455 359
X56 0.22 1.40 0.025 0.015 490 386
X60 0.22 1.40 0.025 0.015 517 414
X65 0.22 1.45 0.025 0.015 531 448
X70 0.22 1.65 0.025 0.015 565 483
X80 0.22 1.85 0.025 0.015 621 552

High-frequency straight seam electric-resistance welded steel pipe(erw steel pipe) is hot-rolled coil after forming machine, the use of high-frequency current skin effect and proximity effects, the tube edge heating and melting, squeeze roller under pressure welding to achieve production.

High-frequency resistance welding steel pipe, welding pipe and ordinary welding process is not the same, the weld is made of the base metal melt from the body, the mechanical strength is better than the general pipe. Smooth appearance, high precision, low cost weld high and small, favorable 3PE anti-corrosion coating. There are significant differences in the welding methods between high frequency welded pipe and submerged arc welded pipe. As the welding is done instantly at high speed, the difficulty of ensuring the quality of welding is much higher than that of submerged arc welding.

ERW Casing

Standard: API SPEC 5CT

Application: Casing serves as wall of well

Specification

OD WT End Type
inch mm inch mm Grade
J55 M65 N80/L80-1 P110
K55
8 5/8 219.08 0.304 7.72 PS
0.352 8.94 PSLB PSLB
0.400 10.16 PSLB PSLB PLB PLB
0.450 11.43 PLB PLB PLB
0.500 12.70 PLB PLB
9 5/8 244.48 0.352 8.94 PSLB PSLB
0.395 10.03 PSLB PSLB PLB PLB
0.435 11.05 PLB PLB PLB
0.472 11.99 PLB PLB PLB
0.545 13.84 PLB PLB
10 3/4 273.05 0.350 8.89 PSB PSB
0.400 10.16 PSB PSB
0.450 11.43 PSB PSB PSB PSB
0.500 12.57 PSB PSB PSB
0.545 13.84 PSB
13 3/8 339.72 0.380 9.65 PSB PSB
0.430 10.92 PSB PSB
0.480 12.19 PSB PSB PSB PSB
0.514 13.06 PSB PSB
16 406.40 0.438 11.13 PSB
0.495 12.57 PSB
0.656 16.66 P
18 5/8 473.08 0.435 11.05 PSB
20 508 0.438 11.13 PSLB
0.500 12.70 PSLB
0.635 16.13 PSLB

Dimensional Tolerance

Standard Tolerance of O.D. Tolerance of W.T. Straightness of Pipe Body Straightness of Pipe End Tolerance for Weight
API 5CT +1%, -0.5% -12.5% ≤0.2%L ≤3.18mm +6.5%, -3.5%

Mechanical Properties

Standard Grade Yield Strength(Mpa) Tensile Strength(Mpa) Hardness(HRC) Impact Energy(J)(min) Impact Temperature(℃)
API 5CT J55 379-552 ≥517 T-10-20(SR16) 21
K55 379-552 ≥655 L-10-27(SR16)
M65 448-586 ≥586 ≤22 T-10-20, L-10-41

C19-20, C76-77(SR16)

0
L80 552-655 ≥655 ≤23
N80 552-758 ≥689
P110 758-965 ≥862

Chemical Composition(%)

Standard Grade C Mn P S Ni Cu Si
API 5CT J55 ≥0.030 ≥0.030
K55 ≥0.030 ≥0.030
M65 ≥0.030 ≥0.030
L80 ≥0.43 ≥1.90 ≥0.030 ≥0.030 ≥0.25 ≥0.35 ≥0.45
N80 ≥0.030 ≥0.030
P110 ≥0.030 ≥0.030