A514 High Tensile Steel Plate is a quenched and tempered alloy steel known for its exceptional strength, toughness, and wear resistance. Designed for demanding structural and heavy-duty applications, A514 steel provides superior performance compared to conventional structural steels.
GNEE Steel supplies premium A514 steel plates with strict quality control, full certification, and global export support, helping customers achieve stronger, lighter, and more cost-efficient structures.
What is A514 High Tensile Steel Plate?
A514 is a high-strength, low-alloy (HSLA) steel plate specified under ASTM standards. It is heat-treated through quenching and tempering to achieve high yield strength (up to 690 MPa / 100 ksi), making it ideal for applications requiring high load-bearing capacity and reduced weight.
Key Features:
- Ultra-high yield strength (≥ 690 MPa)
- Excellent toughness and impact resistance
- Good weldability (with proper procedures)
- Reduced structural weight
- Superior performance in harsh environments
ASTM A514 Steel Plate Chemical Composition
| A514 | C | Mn | P | S | Ni | Cr | Mo |
| Grade A | 0.15-0.21 | 0.80-1.10 | 0.035 | 0.4-0.8 | – | 0.5-0.8 | 0.18-0.28 |
| Grade B | 0.12-0.21 | 0.70-1.0 | 0.035 | 0.20-0.35 | – | 0.4-0.65 | 0.15-0.25 |
| Grade C | 0.1-0.2 | 1.10-1.5 | 0.035 | 0.15-0.30 | – | – | 0.15-0.30 |
| Grade E | 0.12-0.20 | 0.4-0.7 | 0.035 | 0.2-0.4 | – | 1.40-2.0 | 0.4-0.6 |
| Grade F | 0.1-0.2 | 0.60-1.0 | 0.035 | 0.15-0.35 | 0.70-1.0 | 0.4-0.65 | 0.4-0.6 |
| Grade H | 0.12-0.21 | 0.95-1.3 | 0.035 | 0.20-0.35 | 0.3-0.7 | 0.4-0.65 | 0.2-0.3 |
| Grade J | 0.12-0.21 | 0.45-0.7 | 0.035 | 0.20-0.35 | – | – | 0.50-0.65 |
Note: Chemical composition varies by A514 steel grades and heat treatment requirements.
A514 Plate Mechanical Properties
| A514 | Thickness mm | Yield Strength Min Mpa | Tensile Strength Mpa | Elongation Rate Min% |
| ≤ 20 | ≥ 690 | 760-895 | ≥ 18 | |
| 20-65 | ≥ 690 | 760-895 | ≥ 18 | |
| 65-150 | 620 | 690-895 | 18 |
Design & Procurement Insight
Using high-strength HSLA A514 Q plates, with a yield strength of 690 MPa allows for thinner, lighter sections compared to standard carbon steel. This can reduce material tonnage and logistics costs by up to 25–30%, especially in weight-sensitive designs such as long-span bridges or mobile crane booms.
ASTM A514 steel plate is available in several grades designed for different structural and fabrication requirements. The most commonly supplied grades include A514 Grade B, Grade E, Grade H, and Grade Q, each offering high yield strength with slightly different alloy compositions and application focus.
Selecting the correct A514 steel plate grade depends on factors such as plate thickness, welding requirements, and structural load conditions.
For grade selection guidance, see: A514 Grade Comparison: Grade B / E / H / Q Differences
Advantages of A514 High Tensile Steel Plate
1. Exceptional Strength-to-Weight Ratio
A514 allows for thinner sections while maintaining high load capacity, reducing overall structure weight.
2. Improved Structural Efficiency
Less material usage leads to lower transportation, fabrication, and installation costs.
3. Excellent Toughness
Performs reliably under dynamic loads and low-temperature conditions.
4. Good Weldability
With proper preheating and welding procedures, A514 can be welded effectively.
5. Long Service Life
High resistance to deformation and fatigue extends equipment lifespan.
Applications of A514 Steel Plate
A514 high tensile steel is widely used in industries requiring high strength and durability:
- Construction equipment (cranes, excavators)
- Mining machinery and heavy equipment
- Bridges and high-rise buildings
- Pressure vessels and structural components
- Truck frames and transport equipment
Equivalent Grades of A514 Steel Plate
| Standard | Equivalent Grade |
|---|---|
| EN | S690Q / S690QL |
| GB | Q690D / Q690E |
| JIS | SM570 / HT780 |
These equivalents provide similar high-strength performance under different international standards.
A514 vs Other High-Strength Steel Grades Comparison
Within ASTM Standards
| Property / Grade | A514 | A572 Gr.50 | A588 |
|---|---|---|---|
| Yield Strength | ≥ 690 MPa | ≥ 345 MPa | ≥ 345 MPa |
| Tensile Strength | 760–895 MPa | 450–620 MPa | 485–630 MPa |
| Heat Treatment | Quenched & Tempered | Hot Rolled | Hot Rolled |
| Strength Level | Ultra High | Medium | Medium |
| Typical Use | Heavy equipment | Structures | Weathering steel structures |
Equivalent Grade Comparison
| Property / Grade | A514 | S690Q | Q690D |
|---|---|---|---|
| Yield Strength | ≥ 690 MPa | ≥ 690 MPa | ≥ 690 MPa |
| Standard | ASTM | EN | GB |
| Heat Treatment | Q&T | Q&T | Q&T |
| Application | Heavy-duty structures | Structural engineering | Machinery & bridges |
FAQ – A514 High Tensile Steel Plate
What is A514 steel plate mainly used for?
A514 is used in heavy machinery, structural engineering, and high-load applications where high strength is required.
Is A514 steel weldable?
Yes, but it requires controlled welding procedures, including preheating and proper filler materials to avoid cracking.
What is the difference between A514 and A572 steel?
A514 has much higher strength and is heat-treated, while A572 is a standard HSLA steel with lower strength.
Does A514 require heat treatment after purchase?
No, A514 is already supplied in quenched and tempered condition, ready for use.
Can A514 be used in low temperatures?
Yes, it has good low-temperature toughness, especially when additional impact testing is specified.
What industries benefit most from A514?
Mining, construction, transportation, and heavy equipment industries benefit the most.
How to choose the right A514 grade?
Different grades (A, B, E, F, Q) vary in thickness and application. GNEE can help you select the best option.
What grades are available in ASTM A514 steel plate?
ASTM A514 steel plate is commonly supplied in several grades including Grade B, Grade E, Grade H, and Grade Q. These grades share high yield strength properties but differ slightly in alloy composition and recommended applications. Selecting the appropriate A514 steel plate grade depends on plate thickness, welding requirements, and the structural load conditions of the project.
What thicknesses are available for A514 carbon steel plate?
A514 carbon steel plates are typically available in thicknesses ranging from 6 mm up to 150 mm for standard structural applications. For heavy structural or industrial projects, thicker plates may also be supplied through customized rolling or plate cutting services depending on production capability and order quantity.
Can ASTM A514 steel plate be welded?
Yes. ASTM A514 steel plate can be welded when appropriate welding procedures are followed. Because A514 is a quenched and tempered high-strength steel, proper preheating, filler metal selection, and welding procedure specifications (WPS) are recommended to ensure weld integrity and prevent cracking in structural fabrication.
Can A514 steel plates be supplied with certification?
Yes. A514 steel plates are typically supplied with Mill Test Certificates (MTC) verifying chemical composition and mechanical properties. For export or project procurement, optional third-party inspections such as SGS, BV, or Lloyd's can also be arranged to ensure compliance with project specifications.
Why Choose GNEE Steel for A514 Plate?
- Strict quality control and full traceability
- Wide size range and customization services
- Fast delivery and global logistics support
- Rich export experience in heavy industry projects
- Competitive pricing with stable supply
Ready to Source ASTM A514 Plate with Confidence?
We support global contractors and distributors looking for reliable A514 plate suppliers for project-based procurement.
For detailed specifications, stock availability, or a custom quote, contact our sales team today.
Get reliable A514 steel plate supply tailored to your project needs.
Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.
GNEE STEEL PROCESSING
1.CTL & SL SERVICE (141 SETS)
Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.
CTL FACILITIES
Max Length:16500mm
Max Width:2200mm
Max Thickness:25.4mm
Max Yield Strength:1500Mpa
SL FACILITIES
Max Width:2200mm
Max Thickness:18mm
Max slit Quantity:31
Max Yield Strength:1200Mpa
2.CUTTING SERVICE
GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.
Laser Cutting Machine
Max Cutting Length:40,000mm
Max Width:4,600mm
Max Thickness:100mm
Flame Cutting Machine
Max Cutting Length:40,000mm
Max Width:8,000mm
Max Thickness:500mm
Plasmas Cutting Machine
Max Cutting Length:30,000mm
Max Width:5,000mm
Max Thickness:100mm
Water-jet Cutting
Max Cutting Length:12,000mm
Max Width:4,010mm
Max Thickness:250mm
3.FORMING SERVICE
Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm
Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm
Expert in Bending High-Strength & Wear-Resistant Steels
Punching Machine
Max Width:3,070mm
Max Thickness:8mm
Max Pressure:250t
BEVELING SERVICE
GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.
Milling：
Max Cutting Length:18,000mm
Max Width:4500mm
Max Thickness:120mm
Beveling:
Max Length:16,000mm
Max Thickness:80mm
MACHINING SERVICE
GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.
Gantry Type Boring & Milling Maching Center
Max Length:48000mm
Max Width:12500mm
Max Height:8000mm
Max Diameter:10500mm
Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm
MMulti-hole Drilling Equipment
Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm
Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m
Vertical Lathe
Max Height:6,000mm
Max Diametar:φ22,00mm
Automated Edge Milling Machine
The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.
It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.
Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.
Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons
This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.
- Processing Accuracy
Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;
Width accuracy: ±1mm;
Diagonal accuracy: ±2mm;
Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.
- Processing Efficiency
The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.
HEAT TREATMENT
Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t
Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head
Case : Steel Plates Supply for 100,000m³ Full Containment Ammonia Storage Tank Project
GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.
One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.
Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production
Project Materials and Technical Requirements
The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.
Key technical specifications include:
- Material grades: P355NL2 and P275NL2 (Normalized)
- Yield strength: Standard minimum / Maximum limited to 390 MPa
- Hardness: ≤ 225 HBW in base material
- Impact testing: Charpy-V notch test at -50°C, minimum 27J
- Certification: EN 10204 3.1 certificate, with optional 3.2 certification
These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.
Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.
Project Plate Quantities and Thickness Distribution
The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:
P355NL2 – Inner & Outer Tank Shell Plates
- Lower shell courses: 50 mm thickness – approx. 2,000 tons
- Middle shell courses: 25 mm thickness – approx. 1,400 tons
- Upper shell courses: 10 mm thickness – approx. 500 tons
P275NL2 – Tank Bottom Plates
- Thickness: 10–15 mm – approx. 750 tons
P275NL2 – Suspended Roof Structure
- Thickness: 5–8 mm – approx. 180 tons
S275JR – Outer Roof (Ambient Structure)
- Thickness: 10 mm – approx. 450 tons
To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.
Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.
GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.
| TYPE | GRADE | SPECIFICATIONS |
| Carbon Steel / Low Alloy Coil | Q235A/B/C/D/Q355B(Q345B)/C/D/E/SS400/SAPH400-C/ASTMA283Grade C |
0.7~2.0*1250/1500mm*C 2.3~19.5*1250/1500/1800/2000mm*C |
| Medium Heavy Plate | Q235B/Q355B(Q345B)/C/D/E | 6.0-200x150mm-4000mmxL |
| Vessel Plate |
Q245R/Q345R/HP295/SA516MGR485/SA516GR70/P355NL2/P275NL2/ S275JR//SPV490/ASTM A537 Class 1/Class 2 |
2.5-120x1500mm-3000mmxL |
| High Strength Steel |
510L/610L/700L/750L/BS600MCK4/BS700MCK2/BS700MCK4/ BS960E/BWELDY700QL2/L4/BWELDY960QL4/HG60D/70D/785D/ Q460D/Q550D/690D/690E/TQ600MCD/TQ700MCD/S700MCD/ WYS600/700/STRENX700MCE/Q490E/Q490D |
1.2-60x 1500mm-2500mmxL |
| Patterned Steel | HQ235A|B | 1.2-60x 1500mm-2500mmxL |
| Wear-resistance Steel |
NM360/400/450/500/NM300TP/400TP/450TP/ ABREX400/450/500/B-HARD450XKY/ CREUSABRO4800/8000/EH C400LE/450LE/500LE/ |
3.0-50x1250mm-3300mmxL |
| Cold Rolled Coil | DC01/RECC/REDT/SPCC/ST12 | 0.5-3.0x1250mm-1500mmxC |
| Galvanized Plate | DC51D+AZ/DC51D+Z/DX51D+Z/SGH340+Z275/Z275/Z120/S350GD+ZM275 | 0.45-3.0x1250mm-1500mmxC |
| Pickled Coil | DD11/SPHC | 2.0-6.0x1500xC |
Stainless Steel Material and Surface Specifications
| TYPE | GRADE | THICKNESS | SURFACE |
| Austenitic | 304/304H/304L/304J1 | 0.25-150mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 321 | 0.4-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 316/316L/317L/316Ti | 0.3-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 201(J1/J2/J5) | 0.35-12mm | 2B/NO.1/1D |
| Ferrite | 430 | 0.4-3.0mm | 2B/BA/NO.4/8K/SB/HL |
| Ultra Pure Ferrite | 443 | 0.4-2.0mm | 2B |
| Ultra Pure Ferrite | 436L/439/444/441 | 0.5-3.0mm | 2B/2D |
Special Steel / Nickel Base Alloy
| TYPE | GRADE | GRADE (ASTM) | GRADE (EN) | THICKNESS |
| Heat-resistant Steel | 309S | S30908 | 1.4833 | 0.5-40mm |
| Heat-resistant Steel | 310S | S31008 | 1.4845 | 0.5-40mm |
| Duplex Stainless Steel | 2101 | S32101 | 1.4162 | 1.5-50mm |
| Duplex Stainless Steel | 2304 | S32304 | 1.4362 | 3.0-50mm |
| Duplex Stainless Steel | 2205 | S32205/S31803 | 1.4462 | 0.5-60mm |
| Duplex Stainless Steel | 2507 | S32750 | 1.4410 | 1.0-60mm |
| Super Austenitic-Steel | 904L | N08904 | 1.4539 | 0.6-50mm |
| Super Austenitic-Steel | 254SMO | S31254 | 1.4547 | 0.5-50mm |
| Super Austenitic-Steel | 1.4529 | N08926 | 1.4529 | 0.5-50mm |
| Super Austenitic-Steel | AL-6XN | N08367 | 1.4478 | 0.5-50mm |
| Nickel Base Alloy | Alloy 31 | N08031 | 1.4562 | 1.0-50mm |
| Nickel Base Alloy | 800 | N08800 | 1.4876 | 0.8-50mm |
| Nickel Base Alloy | 800H | N08810 | 1.4958 | 0.8-50mm |
| Nickel Base Alloy | 800HT | N08811 | 1.4959 | 0.8-50mm |
| Nickel Base Alloy | Alloy 28 | N08028 | 1.4563 | 1.0-20mm |
| Nickel Base Alloy | Alloy 20 | N08020 | 2.4660 | 1.0-20mm |
| Nickel Base Alloy | 825 | N08825 | 2.4858 | 0.8-40mm |
| Nickel Base Alloy | C276 | N10276 | 2.4819 | 0.5-50mm |
| Nickel Base Alloy | C22 | N06022 | 2.4602 | 1.0-50mm |
| Nickel Base Alloy | 625 | N06625 | 2.4856 | 0.8-20mm |
| Nickel Base Alloy | 400 | N04400 | 2.4360 | 1.0-20mm |
| Nickel Base Alloy | 600 | N06600 | 2.4816 | 1.0-50mm |
| Nickel Base Alloy | Pure Ni 201 | N02201 | 2.4061 | 0.5-20mm |
| Titanium | TA1 | Gr.1 | Class 1 | 0.5-50mm |
| Titanium | TA2 | Gr.2 | Class 2 | 0.5-50mm |
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