ASTM A514 Grade F is a high-yield, quenched and tempered alloy steel plate primarily used for structural applications where weight savings and high strength are critical. It is part of a family of steels often referred to by the trade name T-1 steel.
Key Specifications
Yield Strength: Minimum 100 ksi (approx. 690 MPa) for thicknesses up to 2.5 inches.
Tensile Strength: Typically 110–130 ksi.
Condition: Delivered in a quenched and tempered state to achieve its high-strength and tough mechanical properties.
Thickness Range: Standard availability for Grade F is typically up to 2.5 inches (63.5 mm).
What factors influence the price of A514 Grade E ?
The price of A514 Grade E (often commercially labeled as "T1 Type E") is influenced by a complex matrix of factors, ranging from global commodity markets to highly specific order details. It is a premium product that commands a significant price premium over standard structural steels like A36.
Below is a detailed breakdown of the key influencing factors:
1. Raw Material & Alloy Cost (The Primary Driver)
This is the most volatile and impactful category.
Base Steel Cost: Tied to the price of iron ore and prime scrap steel.
Alloying Elements: A514 Grade E's chemistry is alloy-intensive. Fluctuations in the global markets for these elements have a direct and immediate impact:
Chromium (Cr), Molybdenum (Mo), Nickel (Ni): Critical for strength and hardenability. Their prices are volatile.
Boron (B): Added in minute quantities (0.0005-0.005%) but is a crucial and often costly additive that dramatically increases hardenability.
Manganese, Silicon, etc.
Energy Costs: The production of alloys and the steel itself is extremely energy-intensive.
2. Manufacturing & Processing Costs (The Value-Add Premium)
Quenching & Tempering (Q&T) Process: This is not a standard hot-rolled product. The Q&T process requires specialized, high-energy furnaces, precise temperature control, and additional handling, adding substantial cost.
Quality Assurance & Testing: Meeting the ASTM A514 standard requires rigorous and costly testing:
Mandatory Impact Testing: Charpy V-notch tests at -50°F (-46°C) for every heat (melt).
Full Mechanical & Chemical Certification: Each plate is supplied with a detailed Mill Test Report (MTR).
Mill Economics: Operating rates, production schedules, and efficiency of the specialized mills that produce this grade.
3. Market Dynamics & Supply Chain
Global and Sector-Specific Demand: Demand from key industries-construction, mining, crane manufacturing, and heavy equipment-drives price. A boom in infrastructure or mining increases competition for available plate.
Supply Concentration: Very few mills worldwide have the capability to produce quenched & tempered alloy plate to this specification. This limited supply base affects pricing power and availability.
Trade Policies & Tariffs: In markets like the US, Section 232 tariffs (or other trade measures) on imported steel significantly impact the cost of both foreign and domestic A514 plate by altering competitive dynamics.
Freight & Logistics: The cost to transport heavy plate from the mill to a service center or end-user, influenced by fuel prices and supply chain disruptions.
4. Purchase-Specific Factors (Your Order Details)
These factors determine the final price quoted to a buyer.
Quantity: Mill-direct truckload (TL) quantities are vastly cheaper per pound than a single plate purchased from a steel service center.
Thickness & Size: Standard thicknesses (e.g., 1") and sizes are most economical. Oversized plates, non-standard thicknesses, or extremely thick plates (>2") incur premiums due to more complex rolling and heat treating.
Additional Processing/Certification: Does the order require?
Ultrasonic Testing (UT)?
Special Edge Preparation (e.g., beveling for welding)?
Third-party inspection or certification?
Hardness testing reports?
Each add-on service increases cost.
Lead Time: "Spot" or rush orders command a higher price than orders placed well in advance that can be scheduled into a mill's production run.
Material Chemistry
|
SI |
FE |
MN |
CR |
MO |
TI |
B |
V |
C |
|
0.28% |
98.0% |
0.85% |
0.48% |
0.2% |
0.02% |
0.003% |
0.05% |
0.27 – 0.30% |
1. What is A514 Grade F steel used for?
A514 Grade F is primarily used in high-strength structural applications like heavy construction equipment, crane booms, mining machinery, and bridges where a superior strength-to-weight ratio is required.
2. What is the yield strength of A514 Grade F?
For plates up to 1.25 inches (31.75 mm) thick, the minimum yield strength is 100 ksi (690 MPa). For thicker plates, the yield strength decreases, typically to 90 ksi (620 MPa) up to 2.5 inches.
3. Can A514 Grade F be welded?
Yes, it can be welded, but it requires strict procedures including preheating, the use of low-hydrogen electrodes, and often post-weld heat treatment to prevent cracking due to its high hardenability.
4. How does A514 Grade F differ from Grade E?
The main difference is in chemistry: Grade F has lower carbon and alloy content (and no boron), resulting in better weldability and a lower carbon equivalent, while both grades offer the same minimum yield strength.
5. What is the hardness of A514 Grade F?
The typical hardness range for A514 Grade F is approximately HBW 280-340 (Brinell) or HRC 29-36, but hardness is not a specified property in the ASTM standard.
6. Is A514 Grade F the same as T1 steel?
Yes, A514 Grade F is often commercially referred to as "T1 Type F" or "modified T1." The "T1" name originally came from a trademark, but it's commonly used for this family of high-strength, quenched and tempered steels.
7. What is the European equivalent of A514 Grade F?
The closest European equivalent is S690QL or S690Q/QL1 according to EN 10025-6, which has a similar 690 MPa yield strength and quenched & tempered condition.
8. Can you flame cut A514 Grade F?
Yes, but it requires preheating (typically 300-500°F) and controlled cooling to prevent hardening and cracking along the cut edge. Plasma or waterjet cutting are often preferred alternatives.
9. What is the chemical composition of A514 Grade F?
It has a lower carbon content (max 0.20%) compared to Grade E, along with reduced levels of chromium, molybdenum, and no boron, resulting in a lower carbon equivalent for improved weldability.
10. Why choose A514 Grade F over Grade E?
Choose Grade F when weldability and fabrication ease are top priorities for complex structures, as its leaner chemistry reduces the risk of welding-related cracking compared to the higher-alloy Grade E.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
