ASTM A737 Steel Sheet,Plate, Grade C

ASTM A737 Steel Sheet/Plate, Grade C Product Information -:- For detailed product information, please contact sales. -: ASTM A737 Steel Sheet/Plate, Grade C Synonyms -:- For detailed product information, please contact sales. -:

ASTM A737 Steel, Grade C Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A737 Grade C High-Strength Low-Alloy Steel** **ASTM A737 Grade C** is a **higher-strength variant** within the ASTM A737 specification, designed for **structural applications demanding enhanced strength-to-weight ratios and good toughness**, particularly in **bridges, buildings, and other heavy structures**. This grade provides a **minimum yield strength of 60 ksi (415 MPa)**, offering approximately 20% higher strength than Grade B. Like its counterpart, Grade C is often produced with alloying elements that impart **improved atmospheric corrosion resistance**, qualifying it as a weathering steel when specified with copper, nickel, and chromium additions. The steel achieves its properties through **microalloying (typically with vanadium, niobium, or nitrogen) and controlled rolling**, and is supplied in the **as-rolled or normalized condition**. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A737/A737M** - Standard Specification for Pressure Vessel Plates, High-Strength Low-Alloy Steel. * **Note:** Despite the specification title, A737 is extensively used in **structural applications** due to its favorable mechanical properties and weathering characteristics. The "pressure vessel" designation reflects its material quality standards. * **Key Related Standards:** * **AASHTO M222M/M222** for bridge construction (Grade 60). * **ASTM A6/A6M**: Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling. * **AWS D1.1/D1.5**: Structural Welding Code – Steel / Bridges. * **Heat Treatment:** Typically supplied in the **as-rolled (AR) or normalized (N)** condition, depending on thickness and required properties. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is balanced to achieve higher strength while maintaining good weldability and toughness. The inclusion of atmospheric corrosion-resisting elements is optional but common. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.23 max | Higher limit than Grade B for increased strength; controlled for weldability. | | **Manganese (Mn)** | 1.35 max | Primary solid-solution strengthener and hardenability enhancer. | | **Phosphorus (P)** | 0.04 max | Enhances atmospheric corrosion resistance but limited for weldability. | | **Sulfur (S)** | 0.05 max | Impurity, kept low for improved ductility and weldability. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Copper (Cu)** | **0.20 min (when specified)** | **Key corrosion-resisting element**; enables weathering steel performance. | | **Nickel (Ni)** | 0.25 - 0.50 (when specified) | Enhances toughness and complements Cu's corrosion resistance. | | **Chromium (Cr)** | 0.40 - 0.70 (when specified) | Contributes to corrosion resistance and hardenability. | | **Vanadium (V)** | **0.02 - 0.15** | **Primary microalloying element**; higher range than Grade B for increased precipitation strengthening. | | **Columbium (Cb/Nb)** | 0.005 - 0.05 | Alternative/complementary microalloy for grain refinement. | | **Nitrogen (N)** | 0.020 max (when V is used) | Combines with V to form strengthening vanadium nitride precipitates. | **Key Distinction:** When Cu, Ni, and Cr are specified, Grade C can be used as a **60 ksi weathering steel**, combining high strength with the durability and aesthetic of a protective patina. --- ## **Typical Physical & Mechanical Properties** Properties are for as-rolled or normalized plates. The higher strength is achieved while maintaining adequate ductility. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | **550 - 690 MPa (80,000 - 100,000 psi)** | | **Yield Strength (min)** | **415 MPa (60,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 19% | | **Modulus of Elasticity** | 200 GPa (29,000 ksi) | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Charpy V-Notch Impact Toughness** | **Test Temperature:** Typically specified at **40°F (4°C), 0°F (-18°C), or -40°F (-40°C)**. **Minimum Avg. Energy:** Usually 15-25 ft-lbf (20-34 J) at the specified temperature. | | **Atmospheric Corrosion Resistance** | Approximately **2 times** greater than plain carbon steel (when Cu-bearing composition is specified). | | **Brinell Hardness (typical)** | 200 - 240 HBW | --- ## **Product Applications** ASTM A737 Grade C is specified for structural applications where higher strength allows for more efficient, lighter designs, particularly in long-span or heavily loaded structures. **Primary Structural Applications:** 1. **Long-Span Bridge Construction:** * **Primary Girders** and **Plate Girders** for highway and railway bridges. * **Truss Members** in large-span truss bridges. * **Arch Components** and **Tension Members**. 2. **High-Rise & Heavy Industrial Buildings:** * **Columns** and **Beams** in multi-story buildings where higher strength reduces member size. * **Crane Runway Girders** for heavy-duty material handling. * **Moment Frames** in seismic-resistant construction. 3. **Specialized Transportation Structures:** * **Support Structures** for long-span signage and overhead signals. * **Heavy-Duty Guardrail Systems** on high-speed roadways. * **Frame Components** for specialized trailers and transport equipment. 4. **Industrial & Infrastructure Projects:** * **Transmission Towers** requiring high strength-to-weight ratios. * **Unpainted Industrial Structures** where weathering steel durability is desired. * **Heavy-Duty Storage Racks** and material handling frames. --- ## **Advantages and Fabrication Considerations** * **Advantages:** * **Higher Strength-to-Weight Ratio:** 60 ksi yield strength enables more efficient designs with longer spans or reduced member sizes. * **Weathering Steel Option:** Available with atmospheric corrosion resistance for low-maintenance exposed structures. * **Good Toughness:** Maintains adequate impact properties for structural applications in various climates. * **Material Efficiency:** Higher strength allows for material savings and potentially lower total project costs. * **Fabrication & Design Considerations:** * **Welding Requirements:** **Low-hydrogen welding practices are essential** (e.g., SMAW with E7018 or E8018, FCAW with appropriate wire). Preheat is more critical than for Grade B, especially in thicker sections. * **Carbon Equivalent:** Higher than Grade B due to increased carbon and microalloy content; requires careful welding procedure development. * **Weathering Steel Detailing:** When used as weathering steel, must follow proper design practices for drainage, avoid moisture traps, and allow for initial rust runoff. * **Connection Design:** Higher strength may require special attention to connection details, bolt grades, and weld sizes. * **Not for Continuous Immersion:** Like Grade B, not suitable for constantly submerged applications when used as weathering steel. * **Cost-Benefit Analysis:** Higher material cost may be offset by reduced weight and fabrication savings in appropriate applications. **In summary, ASTM A737 Grade C is a high-strength, microalloyed structural steel offering 60 ksi minimum yield strength with optional weathering steel characteristics. It provides engineers with a versatile material for designing efficient, durable structures where increased strength enables more ambitious architectural and engineering solutions, particularly in bridge construction and heavy industrial applications where both performance and long-term durability are paramount.** -:- For detailed product information, please contact sales. -: ASTM A737 Steel, Grade C Specification Dimensions Size： Diameter 20-1000 mm Length <4533 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 A737 Steel, Grade C Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A737 Steel Sheet,Plate, Grade C -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A737 Steel Sheet,Plate, Grade C -:- For detailed product information, please contact sales. -:

Packing of ASTM A737 Steel Sheet/Plate, Grade C -:- 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 Sheet/Plate 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 1004 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