ASME SA514 Grade T High-Strength Low-Alloy Steel Coil
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Properties and Data
In-depth analysis of ASME SA514 Grade T carbon and low-alloy high-strength steel coil, including chemical composition, mechanical properties, thermal and electrical performance, equivalent grades, and applications.
Hot rolling, Quenching and Tempering, Cold forming, Welding, Machining
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ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Introduction
ASME SA514 Grade T is a quenched and tempered carbon and low-alloy high-strength steel coil specified under the ASME SA514/SA514M standard, widely used in structural and pressure vessel applications. It offers a minimum yield strength of 690 MPa (100 ksi) and excellent toughness. The steel is characterized by its low carbon content, microalloying with boron, vanadium, and titanium to enhance hardenability and strength. Typical applications include heavy equipment, bridges, and offshore structures. Key features: high strength-to-weight ratio, good weldability, and impact toughness at low temperatures.
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Chemical Composition
The chemical composition of ASME SA514 Grade T steel is designed to provide high strength with good weldability and toughness. It features a low carbon content to enhance weldability, with additions of manganese, nickel, chromium, and molybdenum for strength. Boron is added in small amounts to improve hardenability. Vanadium and titanium serve as grain refiners. The composition ranges are based on the ASME SA514/SA514M standard for Grade T.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.08–0.14 | Heat analysis |
| Manganese (Mn) | 0.95–1.20 | Heat analysis |
| Phosphorus (P) | ≤ 0.020 | Heat analysis |
| Sulfur (S) | ≤ 0.010 | Heat analysis |
| Silicon (Si) | 0.20–0.35 | Heat analysis |
| Nickel (Ni) | 0.80–1.10 | Heat analysis |
| Chromium (Cr) | 0.40–0.65 | Heat analysis |
| Molybdenum (Mo) | 0.20–0.30 | Heat analysis |
| Copper (Cu) | ≤ 0.30 | if specified |
| Vanadium (V) | 0.03–0.08 | Heat analysis |
| Titanium (Ti) | 0.01–0.03 | Heat analysis |
| Boron (B) | 0.0005–0.0025 | Heat analysis |
| Iron (Fe) | Balance |
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Thermal and Electrical Physical Properties
The physical properties are typical for quenched and tempered low-alloy steel and are valid at room temperature unless specified. Density is approximately 7.85 g/cm³. The elastic modulus is around 205 GPa. Thermal expansion and conductivity values vary with service temperature. Electrical resistivity is typical for low-alloy steels.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.29 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 11.7 | 10^-6/°C | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10^-6/°C | 20–200°C |
| Thermal Expansion Coefficient (α) | 13.2 | 10^-6/°C | 20–300°C |
| Thermal Conductivity (λ) | 45 | W/m·K | At 20°C |
| Specific Heat Capacity | 475 | J/kg·K | At 20°C |
| Electrical Resistivity (ρ_e) | 0.22 | µΩ·m | At 20°C |
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Mechanical Properties
The mechanical properties are for quenched and tempered condition as per ASME SA514/SA514M. The values depend on the thickness of the coil. For thickness ≤ 63.5 mm (2.5 in): minimum yield strength 690 MPa (100 ksi) and tensile strength 760–895 MPa (110–130 ksi). For thickness > 63.5 mm to 100 mm: yield strength 620 MPa (90 ksi) and tensile strength 690–895 MPa. Elongation is measured in 2 in (50 mm) for plates ≤ 20 mm, typically 18% minimum. Impact properties may be specified by supplementary requirements.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 690 | MPa | Thickness ≤ 63.5 mm, transverse |
| Yield Strength (ReH) | ≥ 620 | MPa | Thickness > 63.5–100 mm, transverse |
| Tensile Strength (Rm) | 760–895 | MPa | Thickness ≤ 63.5 mm |
| Tensile Strength (Rm) | 690–895 | MPa | Thickness > 63.5–100 mm |
| Elongation (A) | ≥ 18 | % | Thickness ≤ 20 mm, in 2 in |
| Elongation (A) | ≥ 16 | % | Thickness > 20 mm to 100 mm, in 2 in |
| Reduction of Area | ≥ 40 (typical) | % | — |
| Hardness | 235–293 | HBW | As quenched and tempered |
| Charpy Impact (KV) | ≥ 27 @ -20°C (optional) | J | Longitudinal, V-notch |
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Full Equivalent Material Standards and Replaceable Grade Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A514/A514M | Grade T | Chemically and mechanically identical |
| USA | ASME SA514/SA514M | Grade T | Original specification for pressure vessels |
| International | ISO 4950-2 | E690 | Similar strength, but different composition |
| Europe | EN 10025-6 | S690QL (1.8928) | Closest European equivalent, boron-free, quenched and tempered |
| Germany | DIN EN 10025-6 | S690QL | Same as EN |
| Japan | JIS G3128 | SHY685 | High yield strength steel, similar applications |
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Application Introduction
ASME SA514 Grade T is designed for high-strength structural applications requiring excellent toughness and weldability. It is widely used in demanding environments.
Product Applications: Bridge girders and structural members, Heavy-duty chassis frames, Drilling rigs and offshore platforms, High-pressure vessels and boilers, Excavator booms, crane arms, Armor plate (light ballistic protection)
Processed into products: Welded beams and columns, Boiler drums and pressure shells, Heavy machinery components (e.g., gears, shafts), Telescopic crane sections, Offshore platform legs and bracings, Structural supports in high-rise buildings
Application industries: Construction and civil engineering, Mining and earthmoving machinery, Offshore and marine, Pressure vessel manufacturing, Transportation (heavy vehicles, trailers), Crane and lifting equipment
ASME SA514 Grade T High-Strength Low-Alloy Steel Coil Similar / Approximate Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A517/A517M | Grade T | For pressure vessels, same composition but different application |
| USA | ASTM A514/A514M | Grade Q | Similar strength, slightly different chemistry |
| Europe | EN 10025-6 | S690Q (1.8931) | Similar strength, different alloy design |
| Europe | EN 10137-2 | S690QL | Older European standard, replaced by EN 10025-6 |
| China | GB/T 16270 | Q690D | Chinese high strength structural steel, quenched and tempered |
| Japan | JIS G3128 | SHY685NS | Steel for welded structures, similar mechanicals |
Notes:
Weldability: Grade T has a carbon equivalent (CEV) typically below 0.50, making it suitable for welding with low hydrogen processes. Preheating and post-weld heat treatment may be required based on thickness. Formability: Can be cold formed with adequate bend radii due to its good ductility. Corrosion resistance: No inherent corrosion resistance; surface protection is recommended for outdoor use. Availability: Supplied in coil form, can be cut to length or slit as required.
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