ASTM A812 HSLA Steel Seamless tube Grade 80

ASTM A812 HSLA Steel Seamless tube Grade 80 Sheet Product Information -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Seamless tube Grade 80 Sheet Synonyms -:- For detailed product information, please contact sales. -:

ASTM A812 HSLA Steel Grade 80 Sheet Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A812 Grade 80 High-Strength Low-Alloy (HSLA) Steel Sheet** **ASTM A812 Grade 80** is a premium **high-strength, low-alloy steel sheet and strip** engineered for the most demanding **structural components where maximum strength-to-weight ratio is critical**. This grade delivers a **minimum yield strength of 80 ksi (550 MPa)**, positioning it at the upper tier of conventional HSLA sheet products. The steel achieves this exceptional strength through a sophisticated combination of **microalloying (niobium, vanadium, titanium), controlled rolling, and often advanced thermomechanical controlled processing (TMCP) or accelerated cooling**. It is designed for applications where reducing material thickness and weight directly translates to performance and efficiency gains, while maintaining sufficient formability and weldability for fabrication. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A812/A812M** - Standard Specification for High-Strength Low-Alloy Steel Sheet and Strip for Welded, Bolted, or Riveted Structural Components. * **Key Characteristic:** This specification covers steels where **mechanical properties are the primary requirement**, allowing producers flexibility in chemistry and processing to achieve the high strength levels of Grade 80. * **Governing Standards:** * **ASTM A941** - Terminology Relating to Steel. * **ASTM A370** - Standard Test Methods and Definitions for Mechanical Testing. * **Processing:** Often supplied in a condition resulting from **Thermomechanical Controlled Processing (TMCP)**, which refines the grain structure to achieve high strength and toughness without subsequent heat treatment. --- ## **Chemical Composition (Weight %, max unless range is specified)** The composition is proprietary and optimized by each producer to meet the Grade 80 mechanical properties. The following represents a typical microalloyed HSLA approach for this strength level. | Element | Typical Composition / Limit (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.12 - 0.18 | Carefully balanced to contribute to strength while managing weldability and formability. | | **Manganese (Mn)** | 1.40 - 1.80 | Primary solid solution strengthener; critical for achieving hardenability in TMCP. | | **Phosphorus (P)** | 0.025 max | Impurity, kept very low. | | **Sulfur (S)** | 0.010 max | **Very low** - Essential for good ductility and through-thickness properties in high-strength steel. | | **Silicon (Si)** | 0.15 - 0.50 | Deoxidizer and solid solution strengthener. | | **Columbium (Cb/Nb)** | 0.04 - 0.08 | **Key microalloy.** Provides potent grain refinement and precipitation strengthening via Nb(CN). | | **Vanadium (V)** | 0.05 - 0.10 | Provides additional precipitation strengthening through V(C,N). | | **Titanium (Ti)** | 0.005 - 0.025 | Used for grain refinement and sulfide shape control (improves ductility). | | **Aluminum (Al)** | 0.015 - 0.060 | Grain refining deoxidizer. | | **Nitrogen (N)** | Controlled | Optimized in relation to V and Ti. | **Note:** The exact "recipe" of microalloys (Nb, V, Ti) and the processing parameters are key intellectual property for steelmakers producing Grade 80. --- ## **Typical Physical & Mechanical Properties (Grade 80 Sheet)** Properties are for hot-rolled sheet/strip produced via controlled processing. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 620 - 795 MPa (90,000 - 115,000 psi) | | **Yield Strength (min)** | **550 MPa (80,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 14% (Subject to thickness; higher for thinner gauges) | | **Yield-to-Tensile Ratio (max)** | Typically ≤ 0.90 | High but controlled to ensure some deformation before fracture. | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Formability** | **Limited but manageable.** Suitable for simple bending and straight forming. Minimum bend radius is typically **3-4 times material thickness** perpendicular to the rolling direction. | | **Brinell Hardness (typical)** | 220 - 280 HBW | --- ## **Product Applications** ASTM A812 Grade 80 is specified for ultra-high-strength components where minimizing weight is paramount, often in safety-critical or performance-driven structures. **Primary Industries and Products:** 1. **Advanced Transportation & Mobility:** * **Critical Frame Members** and **Roll-Over Protective Structures (ROPS/FOPS)** for advanced agricultural and construction machinery. * **Chassis Components** for high-performance specialty vehicles, military vehicles, and racing applications. * **Longitudinal Rails** and **crossmembers** in next-generation heavy trucks for weight reduction and payload increase. 2. **Lifting & Material Handling:** * **Boom Sections** and **jibs** for high-capacity mobile cranes. * **Masts** and **fork arms** for high-lift, high-capacity forklifts. * **Components for advanced automated storage and retrieval systems (AS/RS).** 3. **Energy & Heavy Industry:** * **Lightweight structural supports** in oil & gas equipment. * **Components for renewable energy installations** (e.g., wind turbine internal structures, mounting frames). * **Guarding** and **bracing** for high-stress industrial environments. 4. **Security & Defense:** * **Armor backing plates** and **structural elements** in armored vehicles (as part of a composite system). * **Security paneling** and **blast-resistant module frames**. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **Exceptional Strength-to-Weight Ratio:** 80 ksi yield strength enables radical weight savings and performance enhancements. * **Good Toughness:** TMCP processing typically provides better toughness than expected for its strength level. * **Eliminates Heat Treatment:** Delivers high strength in the as-delivered condition, saving cost and distortion issues. * **Critical Fabrication Considerations:** * **Forming Challenges:** **High springback** and **limited ductility** require careful tooling design and process control. **Hot forming** may be necessary for complex shapes. * **Stringent Welding Requirements:** **Ultra-low hydrogen welding practices are mandatory.** Use of preheat (often 200°F / 95°C minimum) is standard. Welding Procedure Specifications (WPS) must be rigorously qualified. * **Filler Metal Selection:** Must use high-strength, tough consumables (e.g., AWS E11018, ER110S-G). **Undermatching weld metal strength is sometimes acceptable and can improve joint toughness.** * **Thermal Cutting:** Plasma or laser cutting is preferred. Oxy-fuel cutting requires strict preheat to avoid hydrogen cracking and hard edges. * **Damage Sensitivity:** Notches and sharp surface defects are more critical than in lower-strength steels and can initiate cracks under lower stresses. Careful handling is required. * **Galvanizing Consideration:** Hot-dip galvanizing after fabrication may cause a loss of strength due to the thermal exposure; verification testing is essential. **In summary, ASTM A812 Grade 80 represents the forefront of as-rolled HSLA sheet technology, offering an 80 ksi minimum yield strength for extreme weight-reduction applications. It is a material for specialized engineering, demanding sophisticated design, precise fabrication techniques, and a thorough understanding of its behavior under forming and welding to fully harness its significant performance advantages.** -:- For detailed product information, please contact sales. -: ASTM A812 HSLA Steel Grade 80 Sheet Specification Dimensions Size： Diameter 20-1000 mm Length <4544 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 A812 HSLA Steel Grade 80 Sheet Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A812 HSLA Steel Seamless tube Grade 80 Sheet -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A812 HSLA Steel Seamless tube Grade 80 Sheet -:- For detailed product information, please contact sales. -:

Packing of ASTM A812 HSLA Steel Seamless tube Grade 80 Sheet -:- 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 Seamless 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 1015 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