Schmolz + Bickenbach,Cryodur® 2767 Cold Work Die Steel Tube,Pipe

Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Tube Product Information -:- For detailed product information, please contact sales. -: Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Product Information -:- For detailed product information, please contact sales. -: # **Schmolz + Bickenbach Cryodur® 2767 - High-Toughness Cold Work Tool Steel** ## **Product Overview** Cryodur® 2767 is a premium chromium-tungsten alloyed, oil-hardening cold work tool steel produced by Schmolz + Bickenbach. This grade is specifically engineered to deliver **exceptional toughness** combined with good wear resistance and dimensional stability. It corresponds to the classic AISI S7 / DIN 1.2767 shock-resistant steel, making it the ideal choice for applications subjected to severe impact loading and cyclic stresses where fracture resistance is critical. ## **Key Characteristics & Advantages** - **Superior Impact Toughness:** Outstanding resistance to chipping and cracking under shock loads - **Good Wear Resistance:** Maintains adequate wear performance despite high toughness - **Excellent Dimensional Stability:** Minimal distortion during heat treatment - **Deep Hardening Capability:** Achieves uniform hardness in substantial cross-sections - **Good Machinability:** Favorable machining properties in annealed condition - **Versatile Heat Treatment:** Can be used in both hardened and sub-zero treated conditions ## **International Standard Designations** | Standard | Designation | Alternative Names | |----------|-------------|-------------------| | **AISI** | S7 | - | | **DIN / W-Nr.** | 1.2767 | X45NiCrMo4 | | **EN** | - | - | | **JIS** | - | - | | **ISO** | - | - | | **UNS** | T41907 | - | | **AFNOR** | 45NCD16 | - | | **GB (China)** | 5CrNiMo | Similar type | *Note: Exact equivalents may vary by standard and specific composition ranges.* ## **Chemical Composition (%)** | Element | Minimum | Maximum | Typical Range | |---------|---------|---------|---------------| | **Carbon (C)** | 0.45 | 0.55 | 0.50 | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | | **Manganese (Mn)** | 0.60 | 0.90 | 0.75 | | **Chromium (Cr)** | 3.00 | 3.50 | 3.25 | | **Nickel (Ni)** | 1.30 | 1.80 | 1.50 | | **Molybdenum (Mo)** | 0.30 | 0.50 | 0.40 | | **Vanadium (V)** | - | - | - | | *Iron (Fe)* | *Balance* | | | *Proprietary balance of micro-alloying elements may be present to enhance specific properties.* ## **Physical Properties** | Property | Value | Conditions / Notes | |----------|-------|-------------------| | **Density** | 7.78 g/cm³ | At 20°C | | **Thermal Conductivity** | 42.0 W/(m·K) | At 20°C | | **Specific Heat Capacity** | 460 J/(kg·K) | At 20°C | | **Coefficient of Thermal Expansion** | 11.8 × 10⁻⁶/K | 20-200°C | | **Elastic Modulus** | 210 GPa | At 20°C | | **Electrical Resistivity** | 0.35 μΩ·m | At 20°C | ## **Mechanical Properties** ### **Annealed Condition** - **Hardness:** 200-240 HB - **Tensile Strength:** 700-850 MPa - **Yield Strength (Rp0.2):** ≥ 450 MPa - **Elongation (A5):** ≥ 15% - **Machinability:** 70% (compared to 1% C steel) ### **Hardened & Tempered Condition** *Typical values after proper heat treatment:* - **Working Hardness Range:** 54-58 HRC (optimal toughness) - **Compressive Strength:** 2,000-2,400 MPa - **Impact Toughness (Charpy):** 40-60 J (exceptionally high for tool steel) - **Flexural Strength:** High ### **Hardness vs. Tempering Temperature** | Tempering Temperature | Resulting Hardness (HRC) | Impact Toughness | |-----------------------|--------------------------|------------------| | 150°C | 56-58 | Very High | | 200°C | 55-57 | Excellent | | 300°C | 53-55 | Excellent | | 400°C | 50-52 | High | | 500°C | 45-48 | Very High | ## **Heat Treatment Guidelines** ### **Soft Annealing** - **Temperature:** 680-720°C - **Cooling:** Slow furnace cooling to 600°C, then air cool - **Resulting Hardness:** ≤ 240 HB ### **Stress Relieving** - **Temperature:** 600-650°C - **Soak Time:** 1-2 hours per inch - **Cooling:** Air cool ### **Hardening Process** 1. **Preheating:** 550-650°C (thorough equalization) 2. **Austenitizing Temperature:** 930-980°C - *925-950°C for maximum toughness* - *950-980°C for higher hardness/wear resistance* 3. **Soaking Time:** 20-30 minutes per inch at austenitizing temperature 4. **Quenching:** In well-circulated oil (40-60°C) 5. **Quench Delay:** Immediate quenching after reaching temperature ### **Tempering** - **Immediate Tempering:** Required after quenching (within 1 hour) - **Temperature Range:** 150-250°C for 54-58 HRC - 400-500°C for lower hardness with exceptional toughness - **Cycles:** Double tempering recommended (2 hours each minimum) - **Cooling:** Air cool after each tempering cycle ### **Sub-Zero Treatment** (Optional) - **Temperature:** -70 to -100°C - **Duration:** 2-4 hours - **Timing:** Between quenching and tempering - **Benefit:** Transforms retained austenite, increases dimensional stability ## **Typical Applications** ### **Impact & Shock Tools** - **Chisels & Punches:** For concrete, rock, and metal working - **Hammer Heads:** For pneumatic and mechanical hammers - **Shear Blades:** For heavy-duty cutting applications - **Demolition Tools:** Jackhammer bits, breaker tools ### **Cold Work Tooling** - **Punching Dies:** For thick materials and high-impact applications - **Forming Tools:** Where fracture resistance is critical - **Trimming Dies:** For automotive and heavy-gauge materials - **Heading Dies:** For cold heading operations ### **Plastic & Die Casting** - **Cavity Inserts:** For high-pressure die casting (aluminum, magnesium) - **Cores & Ejector Pins:** Where thermal shock resistance is needed - **Mold Bases:** For large, complex molds ### **Special Applications** - **Knives & Cutting Tools:** For abrasive materials requiring toughness - **Machine Components:** Gears, cams, and wear plates - **Aerospace Tooling:** Jigs, fixtures, and assembly tools ## **Machining & Fabrication** ### **Machinability (Annealed)** - **Turning & Milling:** Good (use positive rake angles) - **Drilling:** Adequate (use proper coolant) - **Grinding:** Good with appropriate wheels - **EDM:** Suitable with standard parameters ### **Welding** - **Preheat:** 300-400°C required - **Post-Weld Heat Treatment:** Stress relieve at 550-600°C - **Filler Material:** Matching or austenitic stainless electrodes - **Note:** Welding reduces hardness in HAZ - re-hardening recommended for critical tools ## **Surface Treatments** Cryodur® 2767 responds well to: - **Nitriding:** Increases surface hardness to 900-1100 HV - **CVD/PVD Coatings:** TiN, TiCN, AlCrN for enhanced performance - **Black Oxide:** For corrosion protection and lubricity - **Chrome Plating:** For improved release properties ## **Technical Comparison** | Property | Cryodur® 2767 (S7) | Cryodur® 2510 (O1) | Cryodur® 2379 (D2) | |----------|---------------------|---------------------|---------------------| | **Primary Strength** | Impact Toughness | Wear Resistance | Wear Resistance | | **Typical Hardness** | 54-58 HRC | 58-62 HRC | 58-62 HRC | | **Toughness** | Excellent | Good | Moderate | | **Wear Resistance** | Good | Moderate | Excellent | | **Distortion Control** | Excellent | Excellent | Good | | **Applications** | Impact tools | Precision tools | Long-run wear tools | ## **Availability & Forms** - **Round Bars:** 10mm to 300mm diameter - **Flat Bars:** Various thicknesses and widths - **Blocks:** For die and mold making - **Pre-finished Stock:** Precision ground to tolerances - **Forged Shapes:** Custom configurations available ## **Quality Assurance** - **Ultrasonic Testing:** For internal quality verification - **Macro/Micro Examination:** For cleanliness and structure - **Hardness Testing:** Uniformity verification - **Dimensional Checks:** Per customer specifications ## **Storage & Handling Recommendations** 1. **Storage Conditions:** Dry, temperature-controlled environment 2. **Handling:** Use proper lifting equipment for heavy sections 3. **Protection:** Preservative oils recommended for long-term storage 4. **Identification:** Material certificates accompany all shipments ## **Important Notes** 1. **Safety First:** Always follow proper heat treatment safety procedures 2. **Decarburization:** Protect surfaces during heat treatment 3. **Tool Design:** Incorporate adequate radii and avoid sharp corners 4. **Maintenance:** Regular inspection and maintenance extend tool life ## **Disclaimer** This technical information is for reference purposes only. For specific applications and critical tooling, always consult Schmolz + Bickenbach's official technical documentation and engage qualified metallurgical expertise. Actual performance may vary based on specific heat treatment parameters, section size, tool design, and operating conditions. -:- For detailed product information, please contact sales. -: Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Specification Dimensions Size： Diameter 20-1000 mm Length <7141 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Schmolz + Bickenbach Cryodur® 2767 Cold Work Die Steel Tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3612 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition