ASTM A570 Steel, grade 40

ASTM A570 Steel, grade 40 Product Information -:- For detailed product information, please contact sales. -: ASTM A570 Steel, grade 40 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A570 Steel, grade 40 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A570 Grade 40 Steel** **ASTM A570 Grade 40** is a hot-rolled carbon steel sheet and strip designed for structural applications requiring a minimum yield strength of **40 ksi (275 MPa)**. Positioned in the mid-range of the A570 series, this grade provides enhanced strength characteristics while maintaining good formability and weldability. It serves as an economical solution for structural components where higher load-bearing capacity is needed without resorting to more expensive high-strength low-alloy steels. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A570/A570M** - "Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality" **Grade Classification:** - **Grade 40** [275 MPa] - Minimum yield strength 40 ksi - Other grades in A570 series: 30, 33, 36, 45, 50, 55 **International Equivalents:** - **EN 10025-2**: S275JR/S275J2 - **JIS G3101**: SS400 - **GB/T 700**: Q275 - **ISO 630-2**: E275C --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A570 Grade 40: | 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 Steel Base**: Simple and cost-effective chemical design - **Optimized Carbon Content**: Balances strength and manufacturability - **Manganese Strengthening**: Primary strengthening element - **Standard Deoxidation**: Silicon optional for killed steel applications --- #### **3. Physical & Mechanical Properties** **Mechanical Properties:** | Property | Value | |---|---| | **Tensile Strength** | 480-550 MPa (70-80 ksi) | | **Yield Strength (min.)** | 275 MPa (40 ksi) | | **Elongation in 2" (min.)** | 18% | | **Elongation in 8" (min.)** | 21% | **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 - **Specific Heat Capacity**: 486 J/kg·K --- #### **4. Product Applications** **Structural Framing:** - Heavy-duty building frames - Industrial structural members - Support columns and beams - Roof truss components **Transportation Industry:** - Truck chassis components - Trailer structural members - Heavy vehicle frame reinforcements - Railway car underframe elements **Industrial Equipment:** - Machinery base frames - Equipment support structures - Heavy-duty storage racks - Conveyor system frames **Construction Applications:** - Scaffolding components - Formwork support systems - Temporary bridge decks - Construction platform materials **Agricultural Machinery:** - Tractor frame components - Implement structural members - Harvestor machine frames - Heavy-duty equipment supports --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: Compatible with common welding processes - **Preheat Recommendation**: 50-100°C for thicknesses over ¾ inch - **Recommended Processes**: GMAW, FCAW, SMAW - **Filler Metals**: E70XX series electrodes **Forming & Machining:** - **Cold Forming**: Good capability with proper tooling - **Bend Radius**: Typically 1.5t to 2t for 90° bends - **Machinability**: Fair (approximately 55% of B1112 steel) - **Punching & Shearing**: Good performance with maintained tooling **Surface Characteristics:** - Standard hot-rolled surface with mill scale - Requires surface preparation for optimal coating adhesion - Suitable for most industrial painting systems - Pickled finish available for critical applications **Heat Treatment:** - Supplied in as-rolled condition - Stress relieving recommended for highly constrained welds - Normalizing available for improved properties --- ### **Technical Summary** ASTM A570 Grade 40 offers a practical balance between increased strength and manufacturing practicality in structural steel applications. The 40 ksi yield strength provides a significant advantage over lower grades for load-bearing components while maintaining the cost benefits of carbon steel chemistry. This grade is particularly valuable in applications where Grade 36 strength is insufficient but the premium cost of high-strength low-alloy steels cannot be justified. Its predictable behavior during fabrication and consistent mechanical properties make it a reliable choice for structural components across various industries. While formability is slightly reduced compared to lower grades, it remains sufficient for most structural shaping operations. The grade's position in the A570 series makes it an economical upgrade path for designers seeking enhanced performance without major cost implications. -:- For detailed product information, please contact sales. -: ASTM A570 Steel, grade 40 Specification Dimensions Size： Diameter 20-1000 mm Length <4295 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 40 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A570 Steel, grade 40 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A570 Steel, grade 40 -:- For detailed product information, please contact sales. -:

Packing of ASTM A570 Steel, grade 40 -:- 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 766 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