Large Extrusion Container Shell Forgings (34CrNi3Mo, 42CrMo4, 1.6582)
Premium Quality Mantles and Shells for Heavy Extrusion Presses from FUSHUN SPECIAL STEEL
1. Product Category and Applications
The Large Extrusion Container is the heart of any metal extrusion press, subjected to extreme pressure and thermal stress. The outer shell, often referred to as the Mantle or Shell, typically employs a multi-layer pre-stressed structure (inner liner, middle liner, and outer shell). The outer shell’s primary function is to provide support and apply pre-stress, requiring exceptional strength, toughness, hardenability, and resistance to thermal fatigue.
At FUSHUN SPECIAL STEEL, we specialize in manufacturing these critical heavy forgings. Our shells are engineered to withstand the rigorous demands of the heavy machinery industry, ensuring longevity and safety in operation.
Primary Applications
- Outer shells for Aluminum and Copper Extrusion Presses.
- Support mantles for heavy forging industries.
- High-stress structural components requiring deep hardenability.
- Replacement shells for 50MN+ large extrusion presses.
Key Features
- Superior thermal stability and fatigue resistance.
- Excellent through-hardening capabilities for thick sections.
- High impact toughness to prevent catastrophic failure.
- Custom forged to near-net shape to reduce machining costs.
2. Comparable Steel Grades and Standards
The selection of steel for extrusion container shells varies by region and specific application requirements. FUSHUN SPECIAL STEEL manufactures to all major international standards, ensuring compatibility with your existing equipment.
| Region / Standard | Common Grades | Characteristics & Application |
|---|---|---|
| China (GB/JB) | 34CrNi3Mo 42CrMo / 42CrMo4 40CrNiMoA | 34CrNi3Mo: The premier choice for large and super-large shells. Superior hardenability and low-temp toughness compared to 42CrMo due to Nickel content. 42CrMo: Standard grade for small/medium shells. Cost-effective but limited hardenability for very thick sections. |
| USA (ASTM/AISI) | AISI 4340 AISI 4140 H11 / H13 | AISI 4340: The classic material for large high-stress forgings. Excellent balance of strength and toughness. H11/H13: Used for shells in high-performance aerospace aluminum presses where heat resistance is critical. |
| Europe (DIN/EN) | 1.6582 (34CrNiMo6) 1.7225 (42CrMo4) 1.2714 (56NiCrMoV7) 1.2343 / 1.2344 | 1.6582: Direct equivalent to 34CrNi3Mo. The top choice in European heavy industry for large sections requiring high toughness. 1.2714: High-toughness hot work tool steel, chosen for better heat resistance and temper stability than 1.6582. |
3. Chemical Composition (Typical Values %)
Precise chemical control is vital for the performance of large forgings. We utilize advanced metallurgy to ensure purity.
| Grade | C | Si | Mn | Cr | Mo | Ni | V |
|---|---|---|---|---|---|---|---|
| 34CrNi3Mo / 1.6582 | 0.30-0.38 | Max 0.40 | 0.50-0.80 | 1.30-1.70 | 0.15-0.30 | 1.30-1.70 | – |
| 42CrMo4 / AISI 4140 | 0.38-0.45 | Max 0.40 | 0.60-0.90 | 0.90-1.20 | 0.15-0.30 | – | – |
| AISI 4340 | 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | 0.70-0.90 | 0.20-0.30 | 1.65-2.00 | – |
| 1.2714 | 0.50-0.60 | 0.10-0.40 | 0.60-0.90 | 1.00-1.20 | 0.45-0.55 | 1.50-1.80 | 0.07-0.12 |
4. Mechanical Properties
Mechanical properties are achieved through precise Quenching and Tempering (Q+T). For large cross-sections, grades like 34CrNi3Mo and 1.2714 offer superior uniformity from surface to core.
34CrNi3Mo / 1.6582 (Typical Q+T)
- Tensile Strength (Rm): 900 – 1100 MPa
- Yield Strength (Rp0.2): > 700 MPa
- Elongation (A5): > 12%
- Impact Energy (KV): > 35 J (Excellent low-temp toughness)
- Hardness: 280 – 340 HBW (Customizable)
42CrMo4 / AISI 4140 (Typical Q+T)
- Tensile Strength (Rm): 900 – 1100 MPa
- Yield Strength (Rp0.2): > 650 MPa
- Elongation (A5): > 11%
- Hardness: 280 – 320 HBW
5. Heat Treatment Expertise
Heat treatment is the critical factor for large forgings, especially for wall thicknesses exceeding 300mm. FUSHUN SPECIAL STEEL utilizes specialized polymer quenchants (like PAG) and controlled cooling processes to prevent quenching cracks while ensuring core properties.
- Quenching: Precise temperature control to ensure full transformation without cracking.
- Tempering: Double tempering is often employed to ensure structural stability and relieve internal stresses.
- Stress Relieving: Performed after rough machining to minimize distortion during final finishing.
Note: For 34CrNi3Mo / 1.6582, the heat treatment window is sensitive. Our proprietary process ensures the optimal balance of strength and toughness.
6. Manufacturing Process & Capacity
As a leading manufacturer, we control the entire supply chain from melting to final machining. We welcome bulk orders and offer flexible scheduling for urgent requirements.
Process Flow
- Melting: EAF + LF + VD. For critical applications (50MN+ presses), we use ESR (Electro-Slag Remelting) or VAR to minimize non-metallic inclusions and reduce Sulfur/Phosphorus.
- Forging: High forging ratio (>3:1 or 5:1) using upsetting and drawing out techniques to break down the cast structure and close internal voids.
- Heat Treatment: Normalizing, Quenching, and Tempering.
- Machining: Rough turning, boring, and surface finishing.
Dimensional Capacity
- Max Outer Diameter: 2000mm
- Max Inner Diameter: 1000mm
- Max Height/Length: 3000mm
- Customization: Special sizes available upon request.
7. Why Choose FUSHUN SPECIAL STEEL?
1. Integrated Manufacturing
We handle our own smelting (ESR, VIM, VAR), ensuring raw material purity and traceability for high-end steel grades.
2. In-House Heat Treatment
Our internal heat treatment facilities guarantee stable quality, consistent mechanical properties, and faster delivery times.
3. Advanced Machining
We provide turning, boring, and grinding services. Receiving near-net or finished parts saves you significant time and machining costs.
4. Large Volume Capacity
As a major manufacturer, we are equipped to handle large-scale orders with consistent quality control across all batches.
Ready to Order High-Performance Extrusion Shells?
Contact FUSHUN SPECIAL STEEL today for a quote on 34CrNi3Mo, 42CrMo4, or custom extrusion forgings.
