Hot Mill Piercing Plug Manufacturing | Forged & Cast Seamless Pipe Tools
1.Premium Piercing Plugs for Seamless Pipe Manufacturing
Hot Mill Piercer Tools Piercing Plug is the wearing part of cross rolling piercer in the production of seamless tubes and pipes.
No matter it is plug mill process or mandrel mill process, a solid round (billet) is used. It is uniformly heated in the rotary hearth heating furnace and then pierced by a Mannesmann piercer. The pierced billet or hollow shell is rolling reduced in outside diameter and wall thickness.
We KWM produce piercing plug, guide shoe, mandrel bars for all kinds of pipes, carbon steel pipes, alloy steel pipes and stainless steel pipes,seamless steel tube and pipe piercing mill tool.
As critical consumables in hot piercing operations, KWM’s Hot Mill Piercer Plugs deliver extended service life through precision-engineered metallurgical solutions. Our ISO 9001-certified production ensures compliance with ASTM A519 and EN 10216 standards.
2. Manufacturing Processes
| Plug Type | Production Workflow | Key Advantages |
|---|---|---|
| Forged Plugs | Billet Heating → Multi-Stage Forging → HT | Superior grain flow structure |
| Cast Plugs | Medium Frequency Melting → Sand Casting | Complex geometry capability |
3. Material Specifications & Performance Data
1. 35CrMo Alloy Steel Hot Mill Piercer Tools Piercing Plug
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Application: General-purpose seamless pipe piercing
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Process Flow:
Round Stock → Induction Heating → Closed-Die Forging → CNC Machining → NDT Testing
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Chemical Composition (wt%):
| C | Si | Mn | Cr | Mo | S(max) | P(max) |
|---|---|---|---|---|---|---|
| 0.32-0.40 | 0.17-0.37 | 0.40-0.70 | 0.80-1.10 | 0.15-0.25 | 0.035 | 0.035 |
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Service Life: 800-1,200 piercing cycles
2. H13 Tool Hot Mill Piercer Tools Piercing Plugs
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Application: High-temperature stainless steel pipe production
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Enhanced Features:
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Vacuum degassing during melting
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Triple tempering heat treatment (560°C × 3)
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Mechanical Properties:
| Hardness (HRC) | Impact Toughness (J/cm²) | Thermal Conductivity (W/m·K) |
|---|---|---|
| 38-42 | 25-35 | 24.3 |
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Chemical Composition:
| C | Si | Mn | Cr | Mo | V |
|---|---|---|---|---|---|
| 0.32-0.45 | 0.80-1.20 | 0.20-0.50 | 4.75-5.50 | 1.10-1.75 | 0.80-1.20 |
3. 20CrNi4 Heavy-Duty seamless tube Piercing Plug
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Special Treatment: Plasma Nitriding (0.3-0.4mm case depth)
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Performance Characteristics:
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Surface Hardness: 650-750 HV
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Core Toughness: 280-320 HB
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Chemical Profile:
| C | Mn | Si | Cr | Ni |
|---|---|---|---|---|
| 0.17-0.23 | 0.45-0.65 | 0.45-0.65 | 1.5-1.8 | 3.2-3.8 |
4. Pure Molybdenum (Mo) seamless pipe Piercing Plug
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Application: Titanium/High-Alloy Steel Pipe Production
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High-Temp Performance:
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Service Temperature: Up to 1,800°C
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Thermal Expansion Coefficient: 5.8×10⁻⁶/°C (20-1,200°C)
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Composition:
| Mo | Ti | Zr | C(max) | Impurities |
|---|---|---|---|---|
| ≥95.5% | 1.0-2.0 | 0.1-0.5 | 0.5 | <0.03 |
5. Hot Mill Piercing Plug Specification
| Size(mm) | Materials | Hardness | Notes |
| Φ60-800 | 20CrNi3Mo | Meet the customer’s requirement | Foundry/forging |
| Φ60-800 | 20CrNi4Mo | Meet the customer’s requirement | Foundry/forging |
| Φ60-800 | H13 | Meet the customer’s requirement | Forging |
| Φ60-800 | special | Meet the customer’s requirement | Foundry |
| ≤ Φ60 | 35CrMo | Meet the customer’s requirement | Foundry/forging |
6. Technical Support Services
✅ Material Selection Guide
✅ Plug Life Optimization Consultancy
✅ Emergency Replacement Program
7.Why Choose KWM Piercing Plugs?
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15+ years metallurgical expertise
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24/7 global technical support
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Customized solutions for special alloys
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