ASTM A710 Steel Tube,Pipe, grade A, class 3

ASTM A710 Steel Tube, grade A, class 3 Product Information -:- For detailed product information, please contact sales. -: ASTM A710 Steel Tube, grade A, class 3 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A710 Steel, grade A, class 3 Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A710 Steel, Grade A, Class 3** #### **1. Overview** ASTM A710/A710M is the standard specification for **Age-Hardening, Low-Carbon Nickel-Copper-Chromium-Molybdenum-Columbium (Niobium) Alloy Structural Steel**. **Grade A, Class 3** represents a specific processing variant of this advanced high-strength, low-alloy (HSLA) steel, supplied in the **as-rolled (normalized) and precipitation hardened (aged) condition**. This thermomechanical processing route yields a material with a well-balanced combination of **high strength, excellent low-temperature toughness, superior weldability, and cost-effectiveness**, making it suitable for a broad range of structural and pressure applications. #### **2. International Standard** The primary governing standard is **ASTM A710/A710M - Standard Specification for Age-Hardening, Low-Carbon Nickel-Copper-Chromium-Molybdenum-Columbium Alloy Structural Steel**. The "Class 3" designation explicitly denotes material that has undergone **precipitation heat treatment (aging) following hot rolling**. This differentiates it from the solution-treated Class 2 and other classes. Other relevant standards include: * **ASTM A435/A435M:** Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates. * **ASTM A578/A578M:** Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications. * **AWS D1.1/D1.1M:** Structural Welding Code - Steel. * **ASME Boiler and Pressure Vessel Code, Section II, Part A:** Often references this grade for pressure vessel construction. #### **3. Chemical Composition (Heat Analysis)** The chemical composition for Grade A, Class 3 is identical to other Grade A classes, centered on a very low carbon base with strategic alloying additions to facilitate precipitation hardening. *Typical Composition Ranges (Weight %):* | Element | Grade A, Class 3 | | :--- | :--- | | Carbon (C) | ≤ 0.07 | | Manganese (Mn) | 0.40 - 0.70 | | Phosphorus (P) | ≤ 0.025 | | Sulfur (S) | ≤ 0.025 | | Silicon (Si) | 0.15 - 0.35 | | Nickel (Ni) | 0.70 - 1.00 | | Copper (Cu) | 1.00 - 1.30 | | Chromium (Cr) | 0.40 - 0.80 | | Molybdenum (Mo) | 0.15 - 0.25 | | Columbium (Cb/Nb) | 0.02 - 0.10 | | **Carbon Equivalent (CE)** | **Exceptionally low (~0.34-0.38 per IIW formula), ensuring excellent weldability.** | #### **4. Mechanical & Physical Properties** The as-rolled (normalized) structure, followed by aging, provides a fine-grained microstructure that delivers the required strength and toughness. *Guaranteed Minimum Mechanical Properties (Per ASTM A710/A710M):* | Property | Value (Typical for Plate) | | :--- | :--- | | Yield Strength (min) | 70 ksi (485 MPa) | | Tensile Strength (min) | 85 ksi (585 MPa) | | Elongation in 2 in (min) | 18% | | **Charpy V-Notch Impact Energy** | | | Test Temperature | **-100°F (-73°C)** | | Minimum Avg. Energy | **40 ft-lbf (54 J)** | *Note: Like other Grade A classes, Class 3 is required to meet the same minimum impact toughness of 40 ft-lbf at -100°F, indicating excellent low-temperature performance.* *Typical Physical Properties:* * Density: ~0.284 lb/in³ (7.85 g/cm³) * Modulus of Elasticity: 29,000 ksi (200 GPa) * Poisson's Ratio: 0.29 * Coefficient of Thermal Expansion: 6.5 x 10⁻⁶ /°F (11.7 x 10⁻⁶ /°C) #### **5. Product Applications** ASTM A710 Grade A, Class 3 is utilized in applications where the combination of moderate-high strength, exceptional toughness, and ease of fabrication is critical, but where the full solution heat treatment of Class 2 may not be required for all property aspects. * **Pressure Vessels:** Widely used for pressure vessels and heat exchangers in petrochemical, refining, and power generation industries, especially for low-temperature service. * **Structural Components:** Heavy construction, mining equipment, and offshore platform components (non-node applications) that benefit from its high strength-to-weight ratio and good toughness. * **Shipbuilding:** Hull structures, decks, and bulkheads for commercial and naval vessels, particularly those operating in cold climates. * **Storage Tanks:** For storage of chemicals and gases at moderate to low temperatures. * **General Fabricated Machinery:** Components requiring high strength and good impact resistance without complex post-forming heat treatments. #### **6. Key Characteristics & Advantages** * **Excellent Weldability:** The ultra-low carbon content and low Carbon Equivalent (CE) allow this steel to be welded with minimal preheat requirements in most thicknesses, reducing fabrication costs and complexity. * **Good Low-Temperature Toughness:** Maintains high impact energy down to -100°F, making it suitable for a wide range of sub-zero temperature applications. * **Cost-Effective Production:** The Class 3 (as-rolled + aged) processing is generally more economical than the full solution heat treatment of Class 2, offering a favorable balance of properties and cost. * **Age-Hardening Simplicity:** Achieves its final strength through a relatively simple precipitation hardening treatment, which minimizes distortion compared to quench and temper processes. * **Good Corrosion Resistance:** Copper and chromium additions provide enhanced atmospheric corrosion resistance compared to plain carbon steels. **Conclusion:** ASTM A710 Grade A, Class 3 is a versatile and high-performance age-hardening steel that offers an optimal balance of **strength, toughness, weldability, and manufacturing economy**. By leveraging a hot-rolled microstructure subsequently strengthened by precipitation hardening, it provides a robust and fabricator-friendly material solution. It is an excellent choice for engineers and fabricators involved in pressure equipment, structural projects, and marine applications where reliable performance at low temperatures and simplified welding procedures are key drivers for project success and cost management. -:- For detailed product information, please contact sales. -: ASTM A710 Steel, grade A, class 3 Specification Dimensions Size： Diameter 20-1000 mm Length <5702 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 A710 Steel, grade A, class 3 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A710 Steel Tube, grade A, class 3 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A710 Steel Tube, grade A, class 3 -:- For detailed product information, please contact sales. -:

Packing of ASTM A710 Steel Tube, grade A, class 3 -:- 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 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 2173 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