High-Frequency Induction Welded Pipe Mill

This professionally refurbished Used Pipe Mill delivers precision induction-welded tubing (Φ19–63.5mm ±0.15mm) at 40 m/min with triple-squeeze welding technology and CNC sizing – achieving 98% weld integrity for carbon/low-alloy steels at 60% capital savings versus new equipment.

Precision-Engineered Used Pipe Mill for High-Strength Tubular Production

1. Core Technical Specifications

Pipe Manufacturing Parameters

Category	Technical Specifications	Performance Limits
Pipe Dimensions	Φ19–63.5 mm (±0.15 mm OD tolerance)	Max wall thickness: 8.0 mm (≥Φ42mm)
Material Compatibility	Hot-rolled pickled plate / Cold-rolled strip steel (Yield ≤500 MPa)	Grades: C45, Q345B, S355JR
Production Speed	0–40 m/min (±0.5% stability)	15-sec ramp-up acceleration
Coil Handling	ID ≥Φ508 mm / OD ≤2000 mm / Width ≤200 mm	Max weight: 12 MT
Power Requirements	380V±5% 3P 50Hz / Control: 220V±5%	Peak load: 280 kVA

2. Subsystem Engineering Breakdown

A. Forming & Edge Preparation

Edge Trimmer: Dual-roller compression + milling (Ra 1.6 µm finish)
Active Forming Rolls: 10 sets QT400 ductile iron frames (HRC 55 hardness)
Spindle System: Φ100 mm die seat w/ 28 mm keyway
Precision Adjustment: Servo-driven CNC (±0.05 mm repeatability)
Bearing Technology: Japanese NSK 322xx tapered rollers (60,000 hr MTBF)

B. Welding & Thermal Management

Triple-Squeeze Welding: SQS spindle design (320–340 mm spacing)
Seam Correction: ±0.1° angular adjustment toothed discs
Hybrid Cooling:

Stage 1: Air quenching
Stage 2: Dual-water spray (ΔT: 800°C→80°C in 12 sec)

Scrap Automation: Gaston 1/2HP pneumatic removal w/ auto-jam detection

C. Sizing & Calibration

Active Sizing Rolls: 10 sets w/ 37 kW TECO DC motors
Drive System: Worm gear reducers (15:1 ratio)
Material Integrity: Hard-chrome plated shafts (0.05mm coating, HV 900)

D. Straightening & Finishing

4-Directional CNC Straightening: ≤0.3 mm/m linearity control
Cross Straightening Units: Single-unit single-direction adjustment

3. Material Performance Validation

Material	Thickness	Speed	Weld Integrity	Dimensional Accuracy
SPHC Hot Rolled	4.0 mm	35 m/min	Tensile: 98% base metal	OD: ±0.12 mm
Q345B Alloy Steel	6.0 mm	25 m/min	Bend test: 180° no crack	Wall: ±3%
S45C Carbon	3.5 mm	40 m/min	Hardness deviation: ≤5%	Ovality: ≤0.6%

4. Refurbishment Verification & Component Integrity

Component	Reconditioning Standard	Source
Bearings	Full replacement (NSK/IKO)	Japan
Electrical Systems	TECO motor recalibration	Taiwan
Structural Frames	QT400 ductile iron annealing	Taiwan
Control Cabinet	UL-certified rewiring	OEM-spec
Contract Code	YC-091219	Verified

5. Operational Advantages of This Used Pipe Mill

Engineering Excellence

Dynamic Gap Compensation: Real-time thermal expansion adjustment
Energy Recovery: Regenerative braking (15% deceleration energy reuse)
HMI Interface: Torque/speed/temperature monitoring

Economic Efficiency

Metric	This Used Pipe Mill	New Equivalent
Capital Cost	$620, 000 –$ 780,000	$1.8 –$ 2.2M
Installation	30 days	120 days
ROI Period	<14 months	36 months
Material Yield	97.3%	95.8%

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Used Pipe Mill

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