Name: High-quality spiral-welded pipe
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High-quality spiral-welded pipe

High-quality spiral welded pipes are manufactured by helically winding and welding steel coils through advanced automated processes. These pipes feature uniform wall thickness, excellent structural integrity, and cost-effective production for large-diameter applications across various industrial sectors.

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Email：info@hwdsteel.com

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Add：Keda Xunfei Weilaigang Building, No. 1 Jiangshan South Road, Huangdao District, Qingdao City, Shandong Province

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◉ PRODUCT SPECIFICATION

1. Material Standards & Grades

Primary Standards:

API 5L - Line Pipe (PSL1 & PSL2)
ASTM A139 - Electric-Fusion-Welded Steel Pipe
AWWA C200 - Steel Water Pipe
GB/T 9711 - Petroleum and Natural Gas Industries

Common Material Grades:

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Equivalent Standards
GR. B	≥ 245	415-655	API 5L PSL1
X42	≥ 290	415-655	API 5L PSL1
X52	≥ 359	455-690	API 5L PSL2
X60	≥ 415	520-760	API 5L PSL2
X70	≥ 485	570-760	API 5L PSL2

2. Chemical Composition (% by weight)

Element	GR. B	X52	X60	X70
Carbon (C)	≤ 0.26	≤ 0.26	≤ 0.23	≤ 0.21
Manganese (Mn)	≤ 1.20	≤ 1.40	≤ 1.60	≤ 1.70
Phosphorus (P)	≤ 0.030	≤ 0.025	≤ 0.025	≤ 0.020
Sulfur (S)	≤ 0.030	≤ 0.015	≤ 0.015	≤ 0.010
Silicon (Si)	-	≤ 0.45	≤ 0.45	≤ 0.45
Carbon Equivalent	-	≤ 0.43	≤ 0.43	≤ 0.43

3. Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Energy (J)
GR. B	≥ 245	415-655	≥ 20	-
X52	≥ 359	455-690	≥ 20	≥ 40 @ -10°C
X60	≥ 415	520-760	≥ 19	≥ 40 @ -10°C
X70	≥ 485	570-760	≥ 18	≥ 40 @ -10°C

4. Physical Properties

Property	Typical Value	Test Standard
Density	7.85 g/cm³	ASTM E1266
Modulus of Elasticity	200 GPa	ASTM E111
Poisson's Ratio	0.30	-
Thermal Expansion Coefficient	11.7 × 10⁻⁶/°C	ASTM E228
Thermal Conductivity	51.9 W/m·K	ASTM E1225

5. Product Specifications

Parameter	Standard Range	Tolerance	Customization Available
Outer Diameter	219mm - 3000mm	±0.5%	200mm - 4000mm
Wall Thickness	5mm - 25mm	±10%	4mm - 30mm
Length	6m - 12.5m	+100mm/-0mm	3m - 18m
Ovality	≤ 1.0% of OD	-	≤ 0.8% (Precision)
Straightness	≤ 1.5mm per meter	-	≤ 1.0mm per meter

6. Manufacturing Process

Production Steps:

Coil loading and leveling
Edge milling and forming
Spiral welding (submerged arc welding)
Weld seam inspection
Sizing and cutting
Final inspection and testing

Welding Specifications:

Welding Method: Double-sided submerged arc welding
Weld Reinforcement: 0-2.5mm
Weld Offset: ≤ 1.5mm
Weld Angle: 45-70 degrees

7. Coating & Lining Options

Coating Type	Thickness	Application Method	Standards
FBE Coating	300-500μm	Fusion Bonded Epoxy	AWWA C213
3LPE Coating	2.5-4.0mm	Three-Layer Polyethylene	DIN 30670
Concrete Lining	10-25mm	Centrifugal casting	AWWA C205
Bitumen Coating	3-5mm	Hot applied	AWWA C203

8. Testing & Inspection

Mandatory Tests:

Hydrostatic test (1.5 × design pressure)
Ultrasonic testing of weld seam
X-ray inspection (spot check)
Visual inspection
Dimensional verification
Mechanical properties test

Optional Tests:

Charpy V-notch impact test
Drop-weight tear test (DWTT)
Hardness test
Chemical analysis
Third-party inspection

9. Applications

Industrial Applications:

Water Transmission: Municipal water supply, irrigation systems
Oil & Gas: Transmission pipelines, gathering lines
Mining: Slurry transportation, tailing pipelines
Construction: Piling, structural supports
Electrical: Conduit for cables
Ventilation: Industrial exhaust systems

Advantages:

Cost-effective for large diameters
Flexible length requirements
Good pressure-bearing capacity
Suitable for various soil conditions
Easy installation and maintenance

Quality Assurance:

ISO 9001 Quality Management System
API Monogram License (if applicable)
Third-party certification available
Complete traceability system
Mill test certificates per EN 10204

Technical Support:

Engineering design assistance
Installation guidance
Technical documentation
After-sales service

All spiral welded pipes are manufactured according to international standards and can be customized to meet specific project requirements and environmental conditions.

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration

◉ PRODUCTION AND WAREHOUSING

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