ASTM A572 Steel, grade 65

ASTM A572 Steel, grade 65 Product Information -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 65 Synonyms -:- For detailed product information, please contact sales. -:

ASTM A572 Steel, grade 65 Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: ASTM A572 / A572M Grade 65 Steel** **Product Overview** ASTM A572 Grade 65 is a **premium high-strength low-alloy (HSLA) structural steel** representing the upper strength limit of the standard A572 microalloyed series, with a guaranteed **minimum yield strength of 65 ksi (450 MPa)**. This grade provides approximately 30% higher yield strength than the common Grade 50, offering maximum material efficiency for weight-critical and high-load structural applications. Through advanced **columbium (niobium) and/or vanadium microalloying** combined with controlled rolling practices, it achieves high strength while maintaining adequate toughness and weldability for structural use. Grade 65 is specifically engineered for applications where minimizing cross-sectional area is paramount, often serving as a cost-effective alternative to quenched and tempered steels in non-extreme service conditions. It is primarily available in plate form, with limited availability in structural shapes. **Key International Standards** * **Primary Standard:** **ASTM A572 / A572M** - Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel. * **Governing Specification:** This product conforms to all requirements for **Grade 65**, the highest standard grade in the series. * **Microalloying & Processing:** Achieves its high strength through optimized levels of **Columbium (Cb/Nb)** and **Vanadium (V)**, often combined with **controlled rolling** or **thermomechanical processing (TMP)** to refine the grain structure to an ultra-fine scale. * **Heat Treatment:** Typically supplied in the **as-rolled** or **controlled-rolled** condition. **Normalizing** is strongly recommended for plates over 1 inch thick to ensure uniformity of properties and improve toughness. * **Related Standards:** Comparable in strength to some **ASTM A529** grades and international specifications like **EN 10025-4 S460NL**. It approaches the lower strength range of quenched and tempered plates like **ASTM A514**. **Chemical Composition (Weight % - ASTM A572 Grade 65 Requirements)** Chemistry is tightly controlled to reach high strength without excessive alloying that would compromise weldability. | Element | Requirement (Max, unless noted) | Purpose & Note | | :--- | :--- | :--- | | **Carbon (C)** | 0.23% | Carefully controlled; high enough for strength but limited for weldability. | | **Manganese (Mn)** | 1.35% | Elevated for solid solution strengthening. | | **Phosphorus (P)** | 0.04% | Impurity control. | | **Sulfur (S)** | 0.05% | Impurity control. | | **Silicon (Si)** | 0.40% | Deoxidizer. | | **Columbium (Cb/Nb)** | 0.05% Max (if added) | Critical for grain refinement. | | **Vanadium (V)** | 0.15% Max (if added) | Key precipitation strengthener. | | **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.45 - 0.53, indicating that welding requires **strict, qualified procedures**. | **Physical & Mechanical Properties** | Property | Requirement (ASTM A572 Grade 65) | Typical Performance & Significance | | :--- | :--- | :--- | | **Yield Strength (Min)** | 65 ksi (450 MPa) | Typically 67 - 77 ksi (462 - 531 MPa) | | **Tensile Strength** | 80 ksi (550 MPa) min | Typically 85 - 95 ksi (586 - 655 MPa) | | **Elongation in 2" (Min)** | 15% | Reduced ductility reflects the higher strength level. | | **Yield-to-Tensile Ratio** | Not specified. | Typically 0.79 - 0.85. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | Standard for steel. | | **Key Feature** | **Maximum Strength in the A572 Family:** Pushes the boundaries of microalloyed, as-rolled steel technology to deliver 65 ksi yield strength, providing the highest strength-to-cost ratio within the standard HSLA plate series for structural design. | **Product Applications** ASTM A572 Grade 65 is specified for highly loaded, weight-sensitive components where its strength advantage can be fully utilized. * **Mobile Crane & Heavy Equipment:** Boom chords, tension members, and critical pins in large lattice-boom cranes and excavators. * **Bridge Construction:** Compression members in truss bridges, thick flange plates for hybrid girders, and highly stressed splice plates. * **Material Handling:** Structural components for stacker-reclaimers, ship unloaders, and other high-capacity bulk handling equipment. * **Specialized Transportation:** Frame members for extreme-duty trailers, logging equipment, and heavy haul transport. * **Industrial Machinery:** High-stress frames, bases, and supports for presses, crushers, and large processing equipment. **Advantages & Fabrication Notes** * **Demanding Welding Requirements:** Successful welding is achievable but non-trivial. It requires expert-level procedure control. * **Preheat:** **Mandatory.** Typical range is **250-400°F (121-204°C)**, based on thickness and restraint. Must follow qualified WPS. * **Low-Hydrogen Practice:** Essential. Use of high-toughness, matching-strength electrodes (e.g., E90XX, E100XX series). * **Heat Input Control:** Must be controlled within a specified range to preserve HAZ toughness and prevent excessive softening or hardening. * **Post-Weld Heat Treatment (PWHT):** Often recommended for thick sections or highly restrained welds to relieve residual stresses. * **Formability:** Limited cold formability. **Hot forming is preferred** for any significant bending. If cold formed, generous bend radii and possible post-forming stress relief are required. * **Toughness is Critical:** The base specification has **no toughness requirement**. **Supplementary Charpy V-Notch impact testing (ASTM A6 S1) is absolutely essential** for any structural application to define minimum absorbed energy at the service temperature. * **Cost vs. Performance:** Offers a more economical alternative to quenched & tempered 70-100 ksi steels for applications where the superior toughness of Q&T steel is not strictly necessary. **Disclaimer:** This datasheet describes **ASTM A572 Grade 65**, a high-strength, specialty structural steel. Its use requires careful engineering and experienced fabrication. **Mandatory Procurement & Design Considerations:** 1. **Toughness Specification:** **Never procure this grade without supplementary impact testing requirements (ASTM A6 S1).** Specify the test temperature and minimum absorbed energy (e.g., 20 ft-lb @ 40°F / 4°C). 2. **Welding Procedure Qualification:** Fabrication must be based on Welding Procedure Specifications (WPS) qualified per AWS D1.1 or D1.5 on the actual Grade 65 material. Prequalified procedures do not apply. 3. **Not a General-Purpose Steel:** It is unsuitable for replacement of Grade 50 or 60 without complete redesign of connections and reevaluation of service conditions (especially fatigue and fracture). 4. **Availability:** Confirm with mills/suppliers for plate availability. Availability in standard structural shapes (W-beams, etc.) is very limited; plates are the primary product form. 5. **Normalizing:** For plates thicker than 1 inch (25 mm), insist on normalized material to ensure consistent through-thickness properties. This grade is a powerful but specialized tool. Its successful application hinges on explicit toughness certification, expert welding, and connection details designed for high-strength materials. -:- For detailed product information, please contact sales. -: ASTM A572 Steel, grade 65 Specification Dimensions Size： Diameter 20-1000 mm Length <4720 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 A572 Steel, grade 65 Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A572 Steel, grade 65 -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A572 Steel, grade 65 -:- For detailed product information, please contact sales. -:

Packing of ASTM A572 Steel, grade 65 -:- 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 1191 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