ASTM A709 Steel Capillary, grade 50

ASTM A709 Steel Capillary, grade 50, high-strength, low alloy Steel Capillary (≤ 50 mm) Product Information -:- For detailed product information, please contact sales. -: ASTM A709 Steel Capillary, grade 50, high-strength, low alloy Steel Capillary (≤ 50 mm) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A709 Steel, grade 50, high-strength, low alloy steel (≤ 50 mm) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A709 Grade 50 High-Strength Low-Alloy Steel (≤ 50 mm)** **ASTM A709 Grade 50** is a high-strength low-alloy (HSLA) steel specifically designed for bridge construction applications, providing a minimum yield strength of **50 ksi (345 MPa)**. For thicknesses **≤ 50 mm**, this grade offers an optimal balance of enhanced strength, excellent weldability, and good toughness, making it suitable for critical bridge components where weight reduction and structural efficiency are paramount. --- #### **1. International Standards & Grades** **Primary Standard:** **ASTM A709/A709M** - "Standard Specification for Structural Steel for Bridges" **Grade Classification:** - **Grade 50** - Minimum yield strength 50 ksi (345 MPa) - Other grades in A709 series: 36, 50W, HPS 50W, 70W, HPS 70W, 100, 100W **International Equivalents:** - **EN 10025-4**: S355N - **JIS G3106**: SM490 - **GB/T 714**: Q345q - **ISO 630-2**: E355C --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A709 Grade 50 (≤ 50 mm): | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.23 | | Manganese (Mn) | 1.35 | | Phosphorus (P) | 0.04 | | Sulfur (S) | 0.05 | | Silicon (Si) | 0.40 | | Copper (Cu) | 0.20 (minimum) | | Vanadium (V) | 0.02-0.15 (optional) | **Key Composition Features:** - **Optimized Carbon-Manganese**: Enhanced strength through microalloying - **Vanadium Addition**: Optional for precipitation strengthening - **Mandatory Copper**: Minimum 0.20% for corrosion resistance - **Controlled Alloying**: Balanced chemistry for improved properties --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (for thicknesses ≤ 50 mm):** | Property | Value | |---|---| | **Tensile Strength** | 450-560 MPa (65-81 ksi) | | **Yield Strength (min.)** | 345 MPa (50 ksi) | | **Elongation in 2" (min.)** | 18% | | **Elongation in 8" (min.)** | 21% | **Impact Toughness Properties:** - **Charpy V-Notch Test Temperature**: 70°F (21°C) - **Minimum Impact Energy**: 20 ft-lbf (27 J) - **Enhanced Toughness**: Good fracture resistance **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**: 50.2 W/m·K - **Coefficient of Thermal Expansion**: 11.8 × 10⁻⁶/°C --- #### **4. Product Applications** **Bridge Construction:** - Main girders and stringers - Floor beams and cross frames - Connection gusset plates - Stiffeners and diaphragms **Structural Engineering:** - Building frame components - Heavy structural supports - Crane runway girders - Industrial framework **Transportation Infrastructure:** - Sign bridge components - Overpass structural members - Tunnel support systems - Railway bridge elements **Heavy Equipment:** - Construction machinery frames - Mining equipment components - Material handling structures - Equipment support frames **Marine Structures:** - Bridge pier components - Dock and wharf structures - Marine access systems - Waterfront facilities --- #### **5. Fabrication Characteristics** **Welding Performance:** - **Good Weldability**: With proper procedure control - **Preheat Requirements**: 150-200°F (65-95°C) for thicknesses > 25 mm - **Recommended Processes**: SMAW, GMAW, FCAW - **Filler Metals**: E70XX or E80XX series electrodes **Forming & Cutting:** - **Good Formability**: Suitable for most structural forming - **Minimum Bend Radius**: 2t for 90° bends - **Cutting Methods**: Plasma, laser, and oxy-fuel cutting - **Machinability**: Fair (approximately 55% of B1112 steel) **Quality Assurance:** - **Mandatory Impact Testing**: Charpy V-Notch requirements - **Chemical Analysis**: Heat certification required - **Mechanical Testing**: Tensile tests from each heat - **Non-Destructive Testing**: As specified by purchaser --- ### **Technical Summary** ASTM A709 Grade 50 HSLA steel in thicknesses ≤ 50 mm represents a significant advancement in bridge steel technology, offering 38% higher yield strength compared to Grade 36 while maintaining excellent fabrication characteristics. The enhanced strength-to-weight ratio allows for more efficient structural designs and material savings in bridge construction. The microalloyed chemistry, potentially including vanadium, provides improved strength through precipitation hardening and grain refinement. The mandatory copper content ensures better atmospheric corrosion resistance, contributing to longer service life in bridge applications. The material's balanced combination of strength, toughness, and weldability makes it particularly suitable for fabricated bridge components where both performance and constructability are critical. This grade has become a preferred choice for modern bridge construction, offering designers the ability to create lighter, more efficient structures without compromising safety or durability. The comprehensive testing and quality assurance requirements ensure consistent performance in critical infrastructure applications, making ASTM A709 Grade 50 a reliable and economical choice for bridge projects of all sizes. -:- For detailed product information, please contact sales. -: ASTM A709 Steel, grade 50, high-strength, low alloy steel (≤ 50 mm) Specification Dimensions Size： Diameter 20-1000 mm Length <4321 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 A709 Steel, grade 50, high-strength, low alloy steel (≤ 50 mm) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A709 Steel Capillary, grade 50, high-strength, low alloy Steel Capillary (≤ 50 mm) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A709 Steel Capillary, grade 50, high-strength, low alloy Steel Capillary (≤ 50 mm) -:- For detailed product information, please contact sales. -:

Packing of ASTM A709 Steel Capillary, grade 50, high-strength, low alloy Steel Capillary (≤ 50 mm) -:- 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 Capillary 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 792 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