MPM Mandrel for Seamless Pipes | High-Temperature Rolling Tools

Precision MPM Mandrel Solutions for Seamless Pipe Mills

KWM Machinery’s MPM Mandrel delivers superior dimensional control in multi-stand pipe mills, enabling ±0.15mm wall thickness tolerance for API 5L/EN 10216 seamless pipes hotrolling mill production line. Our mandrels withstand 1,100-1,250°C rolling temperatures with <0.03mm thermal deformation, extending service life by 40% versus conventional tools.

The Mandrel bar is the important tool for mandrel rolling tube mills during seamless tubes and pipes production.The mandrel bar is used to roll a pre-pierced steel billet to produce a tube blank (the preliminary seamless tube). The mandrel bar determines the shape of the inner tube surface.During production ,the mandrel bar has to stand high temperatures, shock loading and high mechanical forces. This leads to heavy wear on the affected surfaces and significant material loss.

With hardened and chromed surfaces basic wear resistance can be achieved, and by using ultraplate coating the mandrel life will be multiplied several times.

MPM Mandrel Core Technical Features

Parameter	Performance Data
Working Temperature	1,100-1,250°C Continuous Operation
Surface Hardness	42-48 HRC (Nitrided Layer)
Straightness Tolerance	≤0.1mm/m (ISO 2768-m)
Cycle Life	8,000-12,000 Pipe Cycles

Material Options & Specifications

1. H13 Hot Work Tool Steel

• Composition (wt%):

  C	Si	Mn	Cr	Mo	V
  0.32-0.45	0.8-1.2	0.2-0.5	4.75-5.5	1.1-1.75	0.8-1.2

• Heat Treatment:

  • Vacuum hardening (1,030°C)

  • Triple tempering (560°C × 3h)

• Applications: Carbon/alloy steel pipes ≤Φ340mm

2. 3Cr2W8V High-Temp Alloy

• Enhanced Properties:

  • Thermal Conductivity: 32.6 W/m·K

  • Red Hardness: 48 HRC @ 600°C

• Composition:

  Cr	W	V	C
  2.0-2.5	7.5-9.0	0.2-0.5	0.3-0.4

Technical Advantages

Tensile strength: RM = 1050 MPa Minimum (105 kg/mm²)
RM = 1280 MPa Maximum (130 kg/mm²)
Yield strength:   Ys ≥ 880 MPa
Elongation:     Min .A=10%
Reduction of area: Min.Z=30%
Charpy V-Notch impact test: Min.  Kv ≥ 20j, testing at room temperature.
Charpy tests will be in transverse orientations.

• Anti-Deformation Design:
  ∙ Internal water cooling channels (20-30L/min flow rate)
  ∙ Finite Element Analysis (FEA)-optimized profile

• Surface Engineering:
  ∙ Plasma nitriding (0.2-0.3mm case depth)
  ∙ HVOF coating options (WC-12Co, AlCrN)

• Quality Assurance:
  ∙ Ultrasonic testing for internal defects (ASTM E2375)
  ∙ 3D laser scanning for dimensional verification

Industry Applications

MPM-mill

Continuous tube mill

Push bench

Assel mill

Certifications & Services

• ISO 9001:2015 & CE Certified Manufacturing

• Value-Added Services:
  ∙ Mandrel Regrinding & Recoating
  ∙ On-site Thermal Profile Optimization
  ∙ Emergency Replacement (72hr Global Delivery)

  

FAQ

Q: Minimum Order Quantity?
A: 1 unit with full customization support.

Q: Can you repair worn mandrels?
A: Yes – our recoating service restores 85% of original performance.

Q: How to monitor mandrel wear?
A: IoT-enabled temperature/strain sensors available (RS485 output).

Call to Action

Maximize Your Mill Productivity Today

✅ Free Wear Analysis – Submit used mandrels for lifetime assessment.
✅ Download Material Guide – Compare H13 vs 3Cr2W8V performance data.
✅ Live Webinar – Watch FEA-optimized mandrel design process.