AISI 1055 Steel, hot rolled

AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: # **Technical Datasheet: AISI 1055 Steel - Hot Rolled Round Bar (19-32 mm / 0.75-1.25 in)** --- ## **1. Product Overview** AISI 1055 hot rolled round bar is a high-carbon steel product supplied in the as-rolled condition with characteristic mill scale surface. This grade offers excellent strength, superior hardness potential, and outstanding wear resistance due to its elevated carbon content. The hot rolling process provides a cost-effective material with reliable mechanical properties, suitable for applications requiring high strength, good hardenability, and resistance to abrasion. The 19-32 mm (0.75-1.25 in) diameter range represents a versatile size for general manufacturing, forging stock, and components that will undergo subsequent heat treatment or machining operations. --- ## **2. Key Characteristics** - **High Strength Properties**: Superior tensile and yield strength among standard carbon steels - **Excellent Hardenability**: Responds exceptionally well to quenching and tempering treatments - **Superior Wear Resistance**: High carbon content provides outstanding abrasion resistance - **Good Hot Workability**: Excellent for forging and hot forming operations - **Economical Production**: Most cost-effective form of high-carbon steel - **Versatile Applications**: Suitable for both mechanical and structural components - **Characteristic Surface**: Features blue/black mill scale requiring removal for finishing --- ## **3. Chemical Composition** | Element | Composition Range (%) | Standard Reference | |---------|----------------------|-------------------| | **Carbon (C)** | 0.50 - 0.60 | SAE J403 / ASTM A29 | | **Manganese (Mn)** | 0.60 - 0.90 | SAE J403 / ASTM A29 | | **Phosphorus (P)** | ≤ 0.040 | SAE J403 / ASTM A29 | | **Sulfur (S)** | ≤ 0.050 | SAE J403 / ASTM A29 | | **Silicon (Si)** | 0.15 - 0.35 | SAE J403 / ASTM A29 | | **Iron (Fe)** | Balance | - | *Note: The carbon range (0.50-0.60%) places this steel at the transition between medium and high-carbon classifications.* --- ## **4. Typical Mechanical Properties (As-Hot Rolled)** | Property | Value Range | Test Standard | |----------|-------------|---------------| | **Tensile Strength** | 670 - 820 MPa (97 - 119 ksi) | ASTM A370 | | **Yield Strength (0.2% offset)** | 460 - 610 MPa (67 - 88 ksi) | ASTM A370 | | **Elongation in 50 mm (2")** | 12% - 17% | ASTM A370 | | **Reduction of Area** | 40% - 50% | ASTM A370 | | **Brinell Hardness** | 187 - 241 HB | ASTM E10 | | **Modulus of Elasticity** | 200 GPa (29,000 ksi) | ASTM E111 | | **Shear Modulus** | 80 GPa (11,600 ksi) | ASTM E143 | | **Poisson's Ratio** | 0.29 | ASTM E132 | | **Impact Strength (Charpy V-notch)** | 12 - 25 J (9 - 18 ft-lb) | ASTM A370 | | **Fatigue Strength (10⁷ cycles)** | 280 - 350 MPa | Rotating bending | | **Machinability Rating** | ~30% (relative to 1212 steel) | - | --- ## **5. Physical Properties** | Property | Value | |----------|-------| | **Density** | 7.87 g/cm³ (0.284 lb/in³) | | **Melting Point** | 1460 - 1510°C (2660 - 2750°F) | | **Thermal Conductivity** | 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 | --- ## **6. Heat Treatment Response** **Normalizing**: 870-925°C (1600-1700°F), air cool **Annealing**: 790-815°C (1450-1500°F), slow furnace cool **Quenching**: 830-855°C (1525-1575°F), water or oil quench **Tempering**: 200-650°C (400-1200°F) for desired properties **Typical Heat-Treated Properties**: - **Quenched & Tempered**: Tensile 1100-1400 MPa, Hardness 35-55 HRC - **Maximum As-Quenched Hardness**: 65-67 HRC - **Surface Hardening**: Induction/flame hardening up to 60-65 HRC - **Hardenability**: Excellent - effective for sections up to 75 mm diameter --- ## **7. International Standard Equivalents** | Standard System | Designation | Comparable Specification | |----------------|-------------|--------------------------| | **UNS** | G10550 | Unified Numbering System | | **SAE/AISI** | 1055 | SAE J403 | | **ASTM** | Grade 1055 | ASTM A29 / ASTM A576 | | **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 | --- ## **8. Primary Applications** ### **Automotive & Transportation** - Heavy-duty axle shafts and drive shafts - Transmission gears and heavy-duty pinions - Suspension system high-strength components - Steering system heavy-duty parts - High-strength fasteners and bolts ### **Industrial Machinery** - Heavy-duty shafts and spindles - High-load gear blanks and sprockets - Machine tool components requiring maximum hardness - Hydraulic cylinder rods for extreme pressure - Press and forging die components ### **Tool & Die Applications** - Cutting tool blanks - Shear blades and cutting edges - Forming dies and mandrels - Tool holders requiring high strength - Mold base components ### **Construction & Mining** - Excavator bucket teeth and adapters - Drill rods and mining tooling - Wear plates and abrasion-resistant liners - Heavy equipment drive and transmission shafts - Crane and hoist critical components ### **Agricultural Equipment** - Tractor transmission gears and shafts - Heavy-duty PTO shafts - Implement drive components - Plow shares and cultivator heavy parts ### **General Manufacturing** - Forging stock for high-strength tools - Die blocks and tooling components - Bearing races and high-load sleeves - Valve bodies and stems for high-pressure systems - Wear-resistant machine components --- ## **9. Fabrication & Processing** ### **Machining Operations** - Best machined in annealed condition - Use carbide tools with positive rake angles - Cutting fluids essential for extended tool life - Mill scale must be removed before precision machining - Recommended cutting speeds: 20-35 m/min (65-115 ft/min) ### **Welding Procedures** - Pre-heating (250-350°C/480-660°F) mandatory - Low-hydrogen electrodes (E10018, E11018) required - Post-weld heat treatment (600-650°C/1110-1200°F) essential - Controlled cooling to prevent cracking - Not recommended for highly stressed welded structures ### **Forming & Forging** - Excellent hot working characteristics - Hot working temperature: 1150-900°C (2100-1650°F) - Moderate cold forming capability with proper radii - Minimum cold bend radius: 3-4 × diameter ### **Surface Preparation** - Scale removal essential for finishing operations - Suitable for various surface treatments after proper cleaning - Ideal substrate for induction or flame hardening --- ## **10. Quality & Inspection** - Standard mill test reports typically available - Dimensional tolerances per ASTM A29 for hot-rolled bars - Surface condition: Hot-rolled with characteristic mill scale - Optional testing: Ultrasonic, magnetic particle, hardness testing - Chemical analysis verification available --- ## **11. Comparison with Similar Grades** | Grade | Carbon Range | Tensile (HR) | Hardness (HB) | Key Difference | |-------|-------------|--------------|---------------|----------------| | **AISI 1050** | 0.48-0.55% | 655-795 MPa | 179-235 | Lower carbon content | | **AISI 1055** | 0.50-0.60% | 670-820 MPa | 187-241 | Higher carbon, better wear resistance | | **AISI 1060** | 0.55-0.65% | 685-835 MPa | 201-255 | Maximum carbon in standard range | | **AISI 1070** | 0.65-0.75% | 700-860 MPa | 217-269 | Spring steel classification | --- **Important Considerations**: 1. Mill scale must be removed for precision applications and welding 2. Heat treatment significantly enhances mechanical properties 3. Consider annealed condition for improved machinability 4. Proper welding procedures are critical due to high carbon content 5. Section size affects achievable hardness and properties 6. Always verify material certification for critical applications --- **Disclaimer**: This technical data sheet provides general information about AISI 1055 hot-rolled steel. Actual properties may vary based on manufacturer, rolling conditions, and specific production parameters. For engineering applications, consult official material specifications and conduct appropriate testing. Professional engineering judgment should be applied for specific applications. --- **Revision**: 1.0 **Date**: November 2023 **Status**: Current Specification -:- For detailed product information, please contact sales. -: AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4829 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, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1055 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1055 Steel, hot rolled, 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 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 1300 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