ASTM A570 Steel Seamless tube, grade 45

ASTM A570 Steel Seamless tube, grade 45 Product Information -:- For detailed product information, please contact sales. -: ASTM A570 Steel Seamless tube, grade 45 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A570 Steel, grade 45 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A570 Grade 45 Steel** **ASTM A570 Grade 45** is a hot-rolled carbon steel sheet and strip designed for structural applications requiring a minimum yield strength of **45 ksi (310 MPa)**. As one of the higher-strength grades in the A570 series, it provides enhanced load-bearing capacity while maintaining adequate formability and weldability. This grade serves as a cost-effective alternative to high-strength low-alloy steels for applications where moderate strength enhancement is required. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A570/A570M** - "Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality" **Grade Classification:** - **Grade 45** [310 MPa] - Minimum yield strength 45 ksi - Other grades in A570 series: 30, 33, 36, 40, 50, 55 **International Equivalents:** - **EN 10025-2**: S275JR/S275J2 - **JIS G3101**: SS400 - **GB/T 700**: Q295 - **ISO 630-2**: E275D --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A570 Grade 45: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.25 | | Manganese (Mn) | 0.90 | | Phosphorus (P) | 0.04 | | Sulfur (S) | 0.05 | | Silicon (Si) | 0.40 (optional) | **Key Composition Features:** - **Carbon-Manganese Steel**: Simple, economical composition - **Controlled Carbon**: Maximizes strength while maintaining weldability - **Manganese Content**: Primary strengthening element - **Standard Deoxidation**: Silicon optional based on processing requirements --- #### **3. Physical & Mechanical Properties** **Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 500-580 MPa (73-84 ksi) | | **Yield Strength (min.)** | 310 MPa (45 ksi) | | **Elongation in 2" (min.)** | 17% | | **Elongation in 8" (min.)** | 20% | **Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Poisson's Ratio**: 0.29 - **Thermal Conductivity**: 51.9 W/m·K - **Coefficient of Thermal Expansion**: 11.7 × 10⁻⁶/°C - **Electrical Resistivity**: 0.18 μΩ·m --- #### **4. Product Applications** **Heavy Structural Components:** - Building support columns - Heavy-duty roof trusses - Industrial mezzanine structures - Crane runway beams **Transportation Equipment:** - Heavy truck frame reinforcements - Trailer structural members - Bus chassis components - Special vehicle frame elements **Industrial Machinery:** - Equipment base frames - Machine tool supports - Heavy conveyor structures - Industrial platform components **Construction Applications:** - Scaffolding tie-beams - Formwork strong-backs - Shoring system components - Temporary bridge structural members **Agricultural Equipment:** - Tractor loader frames - Combine harvester supports - Baler structural components - Sprayer boom structures --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: Requires proper procedure control - **Preheat Recommendation**: 75-125°C for thicknesses over ½ inch - **Recommended Processes**: GMAW, FCAW, SMAW - **Filler Metals**: E70XX or E80XX series electrodes **Forming & Machining:** - **Moderate Formability**: Requires more power for bending operations - **Bend Radius**: Typically 2t to 2.5t for 90° bends - **Machinability**: Fair (approximately 50% of B1112 steel) - **Shearing & Punching**: Requires robust equipment and sharp tooling **Surface Characteristics:** - Standard hot-rolled surface finish - Mill scale removal recommended for welding and coating - Suitable for industrial painting systems after surface preparation - May require abrasive blasting for optimal coating adhesion **Heat Treatment:** - Supplied in as-rolled condition - Stress relieving advisable for complex fabrications - Normalizing available for property enhancement --- ### **Technical Summary** ASTM A570 Grade 45 represents a significant step up in strength within the economical carbon steel category, providing 45 ksi yield strength for applications requiring enhanced load-bearing capacity. While maintaining the cost advantages of carbon steel chemistry, this grade offers designers a practical option for structural components subjected to higher stress levels. The balance between increased strength and maintained fabricability makes it suitable for a wide range of industrial applications where Grade 40 strength is insufficient but alloy steel costs are prohibitive. Careful attention to welding procedures and forming parameters is recommended to ensure optimal performance in finished components. The grade's position in the A570 series makes it an excellent choice for applications requiring moderate strength enhancement while maintaining the manufacturing advantages of hot-rolled carbon steel. -:- For detailed product information, please contact sales. -: ASTM A570 Steel, grade 45 Specification Dimensions Size： Diameter 20-1000 mm Length <4296 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. -: ASTM A570 Steel, grade 45 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A570 Steel Seamless tube, grade 45 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A570 Steel Seamless tube, grade 45 -:- For detailed product information, please contact sales. -:

Packing of ASTM A570 Steel Seamless tube, grade 45 -:- 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 Seamless 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 767 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