AISI 1055 Steel Sheet,Plate

AISI 1055 Steel Sheet/Plate, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1055 Steel Sheet/Plate, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: # **Technical Datasheet: AISI 1055 Steel - Cold Drawn & Annealed Round Bar (19-32 mm / 0.75-1.25 in)** --- ## **1. Product Overview** AISI 1055 cold drawn and annealed round bar is a high-carbon steel product that combines the dimensional precision of cold drawing with the optimized machinability and stress relief achieved through full annealing. This dual-process treatment produces material with exceptional dimensional accuracy, superior surface finish, and a fully softened microstructure ideal for precision machining operations. The annealing process specifically at 790-815°C (1450-1500°F) transforms the cold worked structure into a coarse pearlite-ferrite matrix, providing the softest practical condition for this steel grade while maintaining its full hardenability potential for subsequent heat treatment. --- ## **2. Key Characteristics & Advantages** - **Optimal Machinability**: Annealed condition provides superior chip formation and extended tool life - **Precision Dimensions**: Cold drawing ensures tight diameter tolerances (±0.05 mm / ±0.002 in typical) - **Complete Stress Relief**: Eliminates residual stresses from cold working, minimizing distortion during machining - **Uniform Microstructure**: Coarse pearlite structure for consistent performance - **Enhanced Formability**: Maximum ductility for this carbon content - **Excellent Surface Finish**: Smooth, bright surface (0.8-1.6 µm Ra) with scale-free condition - **Predictable Hardening Response**: Ideal starting condition for subsequent quenching operations --- ## **3. Chemical Composition** | Element | Composition Range (%) | Standard Reference | |---------|----------------------|-------------------| | **Carbon (C)** | 0.50 - 0.60 | ASTM A108 / SAE J403 | | **Manganese (Mn)** | 0.60 - 0.90 | ASTM A108 / SAE J403 | | **Phosphorus (P)** | ≤ 0.040 | ASTM A108 / SAE J403 | | **Sulfur (S)** | ≤ 0.050 | ASTM A108 / SAE J403 | | **Silicon (Si)** | 0.15 - 0.35 | ASTM A108 / SAE J403 | | **Iron (Fe)** | Balance | - | *Note: The carbon range (0.50-0.60%) places this at the higher end of medium-carbon steels, providing excellent hardenability potential.* --- ## **4. Manufacturing Process Sequence** 1. **Hot Rolling**: Initial reduction to approximate dimensions 2. **Cold Drawing**: Precision sizing (typically 10-20% area reduction) 3. **Full Annealing**: Heat to 790-815°C (1450-1500°F), slow furnace cooling at ≤25°C/hr to 500°C 4. **Stress Equalization**: Optional 600-650°C (1110-1200°F) treatment for critical applications 5. **Final Inspection**: Complete dimensional, surface, and metallurgical verification --- ## **5. Typical Mechanical Properties (Annealed Condition)** | Property | Value Range | Test Standard | |----------|-------------|---------------| | **Tensile Strength** | 590 - 740 MPa (86 - 107 ksi) | ASTM A370 | | **Yield Strength (0.2% offset)** | 330 - 480 MPa (48 - 70 ksi) | ASTM A370 | | **Elongation in 50 mm (2")** | 18% - 25% | ASTM A370 | | **Reduction of Area** | 50% - 65% | ASTM A370 | | **Brinell Hardness** | 163 - 207 HB | ASTM E10 | | **Surface Roughness (Ra)** | 0.8 - 1.6 µm (32 - 63 µin) | ASME B46.1 | | **Modulus of Elasticity** | 200 GPa (29,000 ksi) | ASTM E111 | | **Charpy Impact (20°C)** | 35 - 55 J (26 - 41 ft-lb) | ASTM A370 | | **Machinability Rating** | ~55% (relative to 1212 steel) | - | | **Residual Stress** | < 40 MPa surface compression | X-ray diffraction | --- ## **6. Microstructural Characteristics** - **Primary Structure**: Coarse lamellar pearlite (75-85%) with grain boundary ferrite - **Grain Size**: ASTM 5-7 (medium-coarse) - **Pearlite Spacing**: 0.3-0.5 µm interlamellar distance - **Phase Distribution**: Uniform throughout cross-section - **Decarburization**: ≤ 0.15 mm (0.006 in) maximum - **Inclusion Rating**: ASTM E45 ≤ 1.5 thin series --- ## **7. Physical & Thermal Properties** | Property | Value | |----------|-------| | **Density** | 7.87 g/cm³ (0.284 lb/in³) | | **Thermal Conductivity (20°C)** | 47.8 W/m·K (33.1 BTU·in/hr·ft²·°F) | | **Specific Heat Capacity** | 486 J/kg·K (0.116 BTU/lb·°F) | | **Coefficient of Thermal Expansion** | 11.3 µm/m·°C (6.3 µin/in·°F) 20-100°C | | **Electrical Resistivity** | 0.250 µΩ·m | | **Magnetic Properties** | Ferromagnetic | --- ## **8. International Standard Equivalents** | Standard System | Designation | Primary Specification | |----------------|-------------|----------------------| | **UNS** | G10550 | Unified Numbering System | | **SAE/AISI** | 1055 | SAE J403 | | **ASTM** | Grade 1055 | ASTM A108 (with annealing) | | **EN (Europe)** | 1.1208 (C56E) | EN 10083-2 | | **ISO** | C56E | ISO 683-18 | | **JIS (Japan)** | S55C | JIS G4051 | | **GB (China)** | 55# (55钢) | GB/T 699 | | **DIN (Germany)** | 1.1208, Ck56 | DIN 17200 | --- ## **9. Heat Treatment Response** **Subsequent Hardening Capability**: - **Austenitizing**: 830-855°C (1525-1575°F) - **Quenching**: Water or oil for maximum hardness - **Tempering Range**: 200-650°C (400-1200°F) - **Maximum Hardness**: 65-67 HRC (as-quenched) - **Typical Tempered Hardness**: 32-52 HRC depending on temperature --- ## **10. Primary Applications** **Precision Machining Blanks**: - Complex gear and sprocket blanks - High-strength shaft and spindle preforms - Tool and die component blanks - Automotive transmission parts - Heavy machinery components **Industrial Components**: - Machine tool precision parts - Hydraulic system components - Bearing race blanks - Fastener stock for critical applications - Custom engineered parts --- ## **11. Fabrication Characteristics** **Machining Performance**: - Excellent chip control and surface finish - Recommended cutting speeds: 35-55 m/min - Extended tool life compared to harder conditions - Suitable for complex, multi-operation machining **Forming & Welding**: - Good cold formability with proper radii - Welding not recommended without complete re-heat treatment - Best practice: Complete all machining before final hardening --- ## **12. Quality Assurance** - Full traceability and certification - Dimensional tolerances per ASTM A108 - Microstructural verification - Hardness testing multiple locations - Surface finish certification --- ## **13. Comparative Advantages** | Property | Cold Drawn Only | Cold Drawn & Annealed | Improvement | |----------|-----------------|----------------------|-------------| | **Machinability** | 30% | 55% | +83% | | **Tool Life** | Standard | Extended (2-3×) | Significant | | **Surface Finish** | 1.6-3.2 µm | 0.8-1.6 µm | 50% better | | **Distortion Risk** | High | Low | Improved stability | | **Total Machining Cost** | 100% | 70-85% | 15-30% savings | --- ## **14. Technical Specifications Summary** **Dimensional Tolerances**: - Diameter (19-32 mm): ±0.05 mm (±0.002 in) - Straightness: ≤0.2 mm per 300 mm - Roundness: ≤0.03 mm **Available Conditions**: - Standard annealed at 790-815°C - Stress relieved (optional) - Cut to length or standard mill lengths **Packaging**: - VCI paper protected - Plastic end caps - Bundled for secure handling --- **Disclaimer**: This material is supplied in annealed condition for machining purposes and requires final heat treatment for service applications. Properties may vary based on specific processing parameters. Consult technical data for critical applications. --- **Revision**: 1.0 **Date**: November 2023 **Status**: Current Specification -:- For detailed product information, please contact sales. -: AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4828 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. -: AISI 1055 Steel, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1055 Steel Sheet,Plate, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1055 Steel Sheet,Plate, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1055 Steel Sheet/Plate, cold drawn, annealed, 19-32 mm (0.75-1.25 in) round -:- 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 Sheet/Plate 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 1299 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