ASTM A607 Steel, grade 70, hot rolled

ASTM A607 Steel, grade 70, hot rolled Product Information -:- For detailed product information, please contact sales. -: ASTM A607 Steel, grade 70, hot rolled Synonyms -:- For detailed product information, please contact sales. -:

ASTM A607 Steel, grade 70, hot rolled Product Information -:- For detailed product information, please contact sales. -: ## **Product Technical Data Sheet: ASTM A607 Grade 70 Hot-Rolled Steel** ### **1. PRODUCT OVERVIEW** **ASTM A607 Grade 70 Hot-Rolled** is a **high-strength, low-alloy (HSLA) steel plate, sheet, and strip** characterized by its significantly enhanced mechanical properties, including a **minimum yield strength of 70 ksi (483 MPa)**, coupled with **superior atmospheric corrosion resistance**. As part of the ASTM A607 specification, this grade achieves its high strength through a precise microalloying chemistry—primarily with elements like columbium (niobium) or vanadium—and controlled hot-rolling practices, which refine the grain structure and induce precipitation hardening. The "Grade 70" designation specifically refers to its 70 ksi minimum yield strength. It is engineered for applications demanding greater load-bearing capacity and durability than provided by lower-strength grades, without the need for post-rolling heat treatment, offering an optimal balance of performance and cost-effectiveness in structural applications. ### **2. INTERNATIONAL STANDARDS & SPECIFICATIONS** * **Primary Standard:** **ASTM A607 / A607M** - "Standard Specification for Steel, Sheet and Strip, High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, with Improved Atmospheric Corrosion Resistance." This is the governing document for chemistry and mechanical properties. * **Dimensional Standards:** * **ASTM A6 / A6M** - Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling (typically for plates). * **ASTM A568 / A568M** - Standard Specification for Steel, Sheet, Carbon, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements (typically for sheet and strip). * **Testing Standard:** **ASTM A370** - Standard Test Methods and Definitions for Mechanical Testing of Steel Products. * **Comparable Standards:** This grade is functionally analogous to other 70 ksi yield strength HSLA steels, such as **ASTM A572 Grade 65**, but is distinguished by its mandated **minimum copper content** for improved corrosion resistance. ### **3. CHEMICAL COMPOSITION (Ladle Analysis, Maximum % or Range)** The chemical composition is meticulously controlled to achieve the target strength and corrosion resistance. The following are the specified limits per ASTM A607 for Grade 70. | Element | Symbol | Composition (%, max unless noted) | Role & Influence | | :--- | :--- | :--- | :--- | | Carbon | C | 0.26 | Provides fundamental strength and hardenability. Higher limit than Grade 65 to support increased strength. | | Manganese | Mn | 1.65 | A potent solid solution strengthener; critical for achieving high yield strength. | | Phosphorus | P | 0.04 | Increases strength and contributes significantly to atmospheric corrosion resistance. | | Sulfur | S | 0.05 | Impurity; kept low to ensure good toughness and weldability. | | Silicon | Si | 0.30 | Deoxidizer during steelmaking; contributes to strength. | | Copper | Cu | **0.20 min** | **Essential element** for forming a protective patina, providing at least 2x the corrosion resistance of plain carbon steel. | | Columbium (Niobium) | Cb (Nb) | **0.005 - 0.05*** | Primary microalloying element. Key for grain refinement and precipitation hardening, enabling high strength in the as-rolled condition. | | Vanadium | V | **0.01 - 0.10*** | An alternative or complementary microalloying element for precipitation strengthening. | | Nitrogen | N | 0.015 | Controlled to participate in nitride formation for strengthening; excess can harm toughness. | **\*** Note: A minimum combined content of Columbium, Vanadium, and Nitrogen is required by the standard. The specific balance is proprietary to the steel producer to meet the stringent mechanical properties. ### **4. PHYSICAL & MECHANICAL PROPERTIES** #### **Mechanical Properties (Typical, as Hot-Rolled)** | Property | Value (Imperial) | Value (Metric) | Condition / Note | | :--- | :--- | :--- | :--- | | **Yield Strength (min)** | 70 ksi | 483 MPa | Measured at 0.2% offset or 0.5% extension under load. | | **Tensile Strength** | 85 - 110 ksi | 586 - 758 MPa | Higher carbon and manganese content broadens the strength range compared to Grade 65. | | **Elongation in 2" (50mm) (min)** | 16% - 20%* | 16% - 20%* | Minimum values vary with product thickness; see ASTM A607 for detailed tables. | | **Modulus of Elasticity** | 29,000 ksi | 200 GPa | Consistent for all steel grades. | | **Poisson's Ratio** | 0.29 | 0.29 | Typical for steel. | **\*** Elongation is thickness-dependent; thinner products typically have higher minimum elongation requirements. #### **Physical Properties (Typical)** | Property | Value | | :--- | :--- | | **Density** | 0.284 lb/in³ (7,850 kg/m³) | | **Thermal Conductivity (at 100°C)** | ~28 W/m·K | | **Coefficient of Thermal Expansion (20-100°C)** | 11.7 x 10⁻⁶ /°C (6.5 x 10⁻⁶ /°F) | | **Surface Condition** | Characteristic blue-gray **mill scale** from the hot-rolling process. | ### **5. KEY CHARACTERISTICS & PROCESSING** * **High Strength-to-Weight Ratio:** Enables significant weight reduction in structures compared to mild steel (e.g., ASTM A36) or lower-strength HSLA grades, leading to material savings and improved efficiency. * **Enhanced Corrosion Resistance:** The copper-phosphorus alloy system provides superior resistance to atmospheric rusting, extending service life in exposed environments with minimal maintenance. * **Weldability:** **Good with precautions.** The higher carbon equivalent (CE) compared to Grade 65 necessitates careful welding procedure specification. Preheating (typically 150-250°F / 65-120°C, depending on thickness) and low-hydrogen welding practices are strongly recommended to prevent cold cracking. * **Formability:** Suitable for moderate bending and shaping. Minimum bend radii are larger than for lower-strength steels. It is less formable than Grade 65 due to its higher strength. * **Toughness:** Offers good notch toughness at ambient temperatures, suitable for most structural applications. For low-temperature service, supplemental Charpy V-Notch testing should be specified. ### **6. PRODUCT APPLICATIONS** ASTM A607 Grade 70 is designed for demanding structural applications where maximizing strength and durability while minimizing weight is critical. * **Heavy Construction & Infrastructure:** High-load bridge girders, offshore platform modules, crane runways, and support structures for heavy industrial buildings. * **Mining, Quarrying & Material Handling:** High-wear components for excavators, loader buckets, haul truck frames, conveyor support structures, and heavy-duty ore chutes. * **Agricultural Machinery:** Frames and structural members for high-horsepower tractors, combine harvesters, and large balers that require extreme rigidity and strength. * **Transportation & Logistics:** Framing for heavy-duty trailers, flatbeds, railcar underframes, and intermodal container corner castings. * **Energy Sector:** Support structures for wind turbine towers, base frames for large generators, and components in hydraulic fracturing (fracking) equipment. ### **7. AVAILABILITY** * **Forms:** Supplied as **hot-rolled plate, sheet, and strip**. * **Thickness Range:** Typically available from approximately 3/16 inch (5 mm) up to several inches thick, depending on the producer's mill capabilities. * **Identification:** Material is marked with the **ASTM designation (A607)**, **Grade (70)**, heat number, manufacturer's identity, and relevant size information. --- **Disclaimer:** The information provided is based on the ASTM A607 standard and typical industry data. It is for informational purposes only. For final design and procurement, engineers must consult the complete ASTM standard and require **mill-specific certified test reports** for the actual material lot to verify all properties. Welding and fabrication procedures must be qualified for the specific application. -:- For detailed product information, please contact sales. -: ASTM A607 Steel, grade 70, hot rolled Specification Dimensions Size： Diameter 20-1000 mm Length <4730 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 A607 Steel, grade 70, hot rolled Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A607 Steel, grade 70, hot rolled -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A607 Steel, grade 70, hot rolled -:- For detailed product information, please contact sales. -:

Packing of ASTM A607 Steel, grade 70, hot rolled -:- 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 1201 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