ASTM A607 Steel Wire, grade 70

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

ASTM A607 Steel, grade 70, cold rolled Product Information -:- For detailed product information, please contact sales. -: ## **Product Technical Data Sheet: ASTM A607 Grade 70 Cold-Rolled Steel** --- ### **1. PRODUCT OVERVIEW** **ASTM A607 Grade 70 Cold-Rolled** is a premium, high-strength low-alloy (HSLA) steel supplied in the cold-reduced condition. It represents the highest standard-grade strength level within the ASTM A607 specification series, offering a **minimum yield strength of 70 ksi (483 MPa)** combined with **inherently improved atmospheric corrosion resistance**. The cold-rolling process imparts superior dimensional accuracy, a smooth, scale-free surface finish, and enhanced mechanical properties through work hardening. This makes it an ideal material for applications demanding exceptional strength, excellent formability for complex parts, and a high-quality surface for painting or plating, all while providing better durability than standard carbon steels. ### **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 definitive specification governing its chemical and mechanical requirements. * **Dimensional & Quality Standards:** * **ASTM A568/A568M** - Standard Specification for Steel, Sheet, Carbon, and High-Strength, Low-Alloy, Hot-Rolled and Cold-Rolled, General Requirements. This dictates standard tolerances for thickness, width, and flatness for cold-rolled sheet and strip. * **Testing Standard:** **ASTM A370** - Standard Test Methods and Definitions for Mechanical Testing of Steel Products. * **Note:** While similar in strength to other 70 ksi HSLA grades, **ASTM A607 Grade 70 is uniquely defined by its mandatory copper content** for corrosion resistance, differentiating it from grades like ASTM A1008. ### **3. CHEMICAL COMPOSITION (Ladle Analysis)** The chemical composition is the foundation for achieving the steel's signature strength-corrosion balance. It is consistent with the hot-rolled version of the same grade. | Element | Symbol | Composition (%, max unless noted) | Role & Influence | | :--- | :--- | :--- | :--- | | **Carbon (C)** | C | 0.26 | Provides base strength. Controlled to balance strength with cold formability and weldability. | | **Manganese (Mn)** | Mn | 1.65 | Primary solid solution strengthener; essential for achieving the 70 ksi yield strength. | | **Phosphorus (P)** | P | 0.04 | Increases strength and atmospheric corrosion resistance. | | **Sulfur (S)** | S | 0.05 | Impurity; kept low for improved ductility and weldability. | | **Silicon (Si)** | Si | 0.30 | Deoxidizer; contributes to strength. | | **Copper (Cu)** | Cu | **0.20 min** | **Critical element.** Provides the improved atmospheric corrosion resistance characteristic of the A607 specification. | | **Columbium (Cb/Nb)** | Cb | 0.005 - 0.05* | Primary microalloying element. Provides grain refinement and precipitation strengthening, crucial for high strength in the lighter gauges typical of cold-rolled products. | | **Vanadium (V)** | V | 0.01 - 0.10* | Alternative microalloying element for precipitation strengthening. | | **Nitrogen (N)** | N | 0.015 | Supports nitride formation for strengthening. | **\*** The standard specifies a minimum combined content of these microalloying elements. The exact formulation is proprietary to the steel producer. ### **4. PHYSICAL & MECHANICAL PROPERTIES** #### **Mechanical Properties (Typical, as Cold-Rolled)** *Cold rolling increases strength and hardness but reduces ductility compared to the hot-rolled state.* | Property | Value (Imperial) | Value (Metric) | Condition / Note | | :--- | :--- | :--- | :--- | | **Yield Strength (min)** | 70 ksi | 483 MPa | Measured at 0.2% offset. Achieved via microalloying + work hardening. | | **Tensile Strength** | 80 - 100 ksi | 550 - 690 MPa | Consistent, high strength. | | **Elongation in 2" (50mm)** | 12% - 16% (Typ.) | 12% - 16% (Typ.) | Lower than hot-rolled due to work hardening; sufficient for moderate forming. | | **Modulus of Elasticity** | 29,000 ksi | 200 GPa | Unaffected by cold working. | | **Hardness (Rockwell B)** | 88 - 102 HRB | ~ | Varies with the exact degree of cold reduction (temper). | #### **Physical Properties (Typical)** | Property | Value | | :--- | :--- | | **Density** | 0.284 lb/in³ (7,850 kg/m³) | | **Thermal Conductivity** | ~28 W/m·K (at 100°C) | | **Coefficient of Thermal Expansion** | 11.7 x 10⁻⁶ /°C (20-100°C) | | **Surface Finish (Ra)** | 0.4 - 1.5 µm (16 - 60 µin) | *Smooth, commercial-quality finish, ideal for coating.* | ### **5. KEY CHARACTERISTICS & PROCESSING** * **Superior Surface Quality:** The cold-rolling process eliminates mill scale, providing a clean, smooth, and uniform surface that is optimal for high-quality painted, powder-coated, or plated finishes with minimal pretreatment. * **High Strength & Dimensional Precision:** Offers the highest yield strength among standard A607 grades, with excellent thickness, width, and flatness control (per ASTM A568), crucial for precision stamping and fabrication. * **Formability:** Exhibits good **uniform elongation** suitable for demanding roll-forming, bending, and moderate drawing operations. For severe forming, a subsequent **annealing** process can be specified to restore ductility (producing "annealed" or "skin-passed" tempers). * **Weldability:** **Fair.** The combination of higher carbon/manganese content and a work-hardened structure increases susceptibility to heat-affected zone (HAZ) hardening. Use of **low-hydrogen welding processes** (e.g., GMAW), preheating (~200°F / 95°C for thicker sections), and lower heat inputs are strongly recommended. * **Corrosion Resistance:** Inherent 2x improvement over plain carbon steels. The excellent surface finish further enhances the performance and adhesion of applied protective coatings. ### **6. PRODUCT APPLICATIONS** This grade is specified for critical components where **maximum strength, tight tolerances, and superior surface appearance** are required. * **Automotive Safety & Chassis:** Seat frame reinforcements, door intrusion beams, bumper reinforcements, and critical underbody structural components requiring high energy absorption. * **Heavy-Duty Equipment Cabins & Structures:** Structural members for agricultural tractor cabs, excavator operator stations, and lifting equipment where strength and operator safety are paramount. * **High-Performance Storage & Racking:** Uprights and beams for ultra-high-capacity warehouse pallet racking, automotive storage racks, and industrial shelving systems. * **Building Products & Architecture:** High-strength roofing and wall panels, structural door frames for industrial facilities, and architectural elements requiring a superior painted finish. * **Transportation:** Container hardware, trailer side posts and upper rail reinforcements, and components for bus and railcar interiors. ### **7. AVAILABILITY & TEMPER DESIGNATIONS** * **Forms:** Primarily supplied as **cold-rolled sheet and strip** in coils or cut-to-length sheets. * **Common Tempers:** Available in tempers to suit fabrication needs: * **Full Hard (Temper 1):** Maximum as-rolled strength, for limited forming. * **Skin-Passed (Temper 2):** Slightly tempered for improved flatness and limited formability. * **Annealed (Soft):** Heat-treated for severe forming applications, often followed by a skin pass. * **Thickness Range:** Typically from about 0.015 inches (0.38 mm) up to approximately 0.25 inches (6.35 mm), depending on the producer. --- **Disclaimer:** This data sheet provides generalized information based on the ASTM A607 standard and typical industry practice. For engineering and procurement purposes, **always consult the full ASTM standard and require certified mill test reports (CMTRs)** for the specific material lot. Welding and forming procedures must be developed and qualified for the specific application. -:- For detailed product information, please contact sales. -: ASTM A607 Steel, grade 70, cold rolled Specification Dimensions Size： Diameter 20-1000 mm Length <4731 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, cold rolled Properties -:- For detailed product information, please contact sales. -:

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

Packing of ASTM A607 Steel Wire, grade 70, cold 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 Wire 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 1202 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