Enhancing Performance with Grade 11 Alloy Steel Plates

SA387 Grade 11 Class 1 Steel Plate | SA387 Grade 11 Class 2 Steel Plate

Prosaic Steel and Alloys India we stock and supply Alloy Steel Plates sourced from the top mills to offer high-performance plates at the most competitive prices. We are stockists and suppliers of ASTM A 387 Alloy Steel Plates, including grades 5, 9, 11, 22, and 91, made from fully killed steel used under elevated temperature conditions.

Enhancing Performance with Grade 11 Alloy Steel Plates

As a pressure vessel grade steel for use in elevated temperature service, ASME SA387 Grade 11 Steel Plate is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures

ASME SA387 standard plates are used by the world's leading fabricators who in turn, supply primarily to the oil and petrochemical industry. Applications for ASME SA387 include pressurized vessels, industrial boilers, heat exchangers and Pipe work.

• The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively.
• The higher levels of chromium also provide excellent corrosion and oxidation resistance, which is a must in sour gas applications
• The ASME SA387 standards covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service.

Benefits of Using Grade 11 Alloy Steel Plate

SA 387 Grade 11 class 2 Alloy Steel Plate is made with Chromium, Molybdenum, Carbon, Manganese, Phosphorus, Sulphur and Silicon. They are used in many industries, especially the oil, gas and petrochemical industries where liquids and gases are often stored at High Strength and Durability Grade 11 alloy steel plate offers excellent strength and toughness, making it ideal for demanding applications

Corrosion Resistance The chromium and molybdenum content provides enhanced resistance to oxidation and corrosion and Versatility Can be used in a wide range of applications across various industries due to its robust properties and High-Temperature Stability Maintains mechanical integrity and performance at elevated temperatures.

Applications of Grade 11 Alloy Steel Plate and Stainless Steel Plate

11 Class 2 plate and Aluminium Plates are commonly used in applications such as Boiler, heat exchangers, pressure vessels and piping. They are also used in the oil and gas industry, power generation and chemical processing.

• Petrochemical and Refining Industries
• Power Generation
• Construction
• Automotive

Petrochemical and Refining Industries Used in the fabrication of Pressure Vessel, heat exchangers, and other equipment where high temperature and pressure conditions are prevalent and Power Generation Commonly used in Boiler and components that operate under high temperature and pressure and Construction Employed in structural components subjected to heavy loads and harsh environments and Automotive Utilized in manufacturing parts that require durability and resistance to wear and tear.

Factors to Consider When Choosing Grade 11 Alloy Steel Plate and Aluminium Plates

When choosing Grade 11 alloy steel plate for your application, it's important to consider several factors to ensure it meets the specific requirements of your project. Here are some key factors to consider

Thermal Properties Operating Temperature Verify the material's performance at the operating temperatures of your application, especially if it's for high-temperature environments and Thermal Expansion and Conductivity Consider how the material will expand and conduct heat when exposed to temperature changes and Fabrication and Machinability Weldability Ensure that Grade 11 Alloy Steel can be welded using the available welding processes and that any preheating or post-weld heat treatments are manageable and Formability and Machinability Consider how easily the material can be shaped and machined into the desired components.

Standards and Specifications Compliance with Standards Ensure the material meets relevant industry standards and specifications, such as ASTM, ASME, or ISO and Certification Requirements Verify if certification or testing documentation is needed for quality assurance and regulatory compliance and Application-Specific Requirements Load-Bearing Capacity Evaluate the material's ability to bear the loads specific to your application and Impact and Fatigue Resistance Consider the material's resistance to impact and fatigue, especially for dynamic or cyclic loading conditions and Compatibility with Other Materials Ensure the material is compatible with other materials used in your application to avoid issues like galvanic corrosion.

Maintenance Tips for Grade 11 Alloy Steel Plate

Maintaining Grade 11 Alloy Steel plate involves several key steps to ensure its longevity, performance, and safety. Grade 11 alloy steel, which typically includes chromium and molybdenum, is known for its high strength and resistance to corrosion and high temperatures. Here are some maintenance tips

• Regular Inspection
• Cleaning
• Proper Storage
• Repair and Refurbishment
• Professional Maintenance

Regular InspectionVisual Inspection Regularly check for signs of corrosion, wear, cracks, and other damages and Non-Destructive Testing (NDT) Methods such as ultrasonic testing, magnetic particle testing, and dye penetrant inspection can detect subsurface defects and Cleaning Routine Cleaning Remove dirt, grease, and other contaminants. Use appropriate solvents or detergents and Rust Removal If rust forms, use a rust remover or mild abrasive to clean it off. Avoid harsh abrasives that can scratch the surface

Proper Storage Dry Environment Store the plates in a dry, well-ventilated area to avoid moisture accumulation and Covering Use tarps or covers to protect the steel from direct exposure to weather elements and Repair and RefurbishmentTimely Repairs Address any damage or wear promptly to prevent further deterioration and Welding and Fabrication Use appropriate welding and fabrication techniques to avoid introducing weaknesses

Professional Maintenance Expert Consultation Periodically consult with materials engineers or maintenance experts for comprehensive assessments and advanced maintenance techniques and Training Ensure maintenance personnel are trained in handling and caring for Grade 11 alloy steel.

Technical conditions of SA 387 Grade 11 Alloy Steel Plates

• Ultrasonic tested as per SA 578 or any other as per requirement
• MTC acc to EN 10204 / 3.2
• Charpy Impact tested at -20 / - 46 DegC.
• Furnace Normalised
• BQ Plates with IBR form IV

ASME SA387 Grade 11 Alloy Steel Plates and Stainless Steel Plate

As a pressure vessel grade steel for use in elevated temperature service, ASME SA387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures and The higher levels of chromium also provide excellent corrosion and oxidation resistance, which is a must in sour gas applications

Equivalents

Specifications for ASME SA387 Grade 11 Alloy Steel Carbon Steel Plates Chromium & Molybdenum content

This specification covers molybdenum alloy steel and Carbon Steel plates, intended particularly for welded Boiler and other Pressure Vessel. Plates under this specification are available in three grades having different strength levels: Grade A; Grade B; and Grade C. The steel shall be killed. The steel shall conform to the chemical requirements specified. Tension tests on plates shall conform to the requirements specified. Plates under this specification are available in three grades having different Strength levels as follows:

Sourced from some of Western Europe's & Asia's finest steel mills, Prosaic Steel & Alloys stock a wide range of ASME SA387 Class 2 plates which are available for shipment worldwide ASTM A387, ASME SA 387, is one of our most popular products. It is a low alloy Pressure Vessel quality steel for high temperatures. We have a wide range of Aluminium Plates sizes available and Thickness range from 6 - 100mm.

Tensile Requirements for ASME SA387 Grade 11 Alloy Steel and Carbon Steel Plates Class 2 Plates

Chemical Requirements for ASME SA387 Grade 11 Alloy Steel and Carbon Steel Plates

SA 387 Grade 11 Alloy Steel Plate Packing

A387 Grade 11 Alloy Steel Plate and Stainless Steel Plate is packed loose or Bundle with wire rope / strip or in a wooden palate / box. Clear labels are tagged on the outside of the package for easy identification of the quantity and product I.D. Great care is taken during operation and transportation. SA387 Grade 11 Plate packing will be according to international standard in bundles strapped by strips then into containers to avoid any damage.

Delivery: Within 10-211 days or asap if we have enough stock

Types of Packaging:

• - Bundles
• - Wooden Boxes
• - Crates (steel/wooden)
• - Wooden Palate
• - Packaging for SA 387 Grade 11 Alloy Steel Plate as per customer's requirements

Special Features:

• - Each bundle covered with plastic for protection against extreme weather.
• - Bundles strapped with Metal strips.
• - Packaging list (laminated) placed with box/crate.

SA387 Grade 11 Alloy Steel Plate and Aluminium Plates Sizes Available in Stock with Price

• 0.2 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 0.3 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 0.4 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 0.8 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 1 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 1.611 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 2.11 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 3.1 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 04 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 011 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 06 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 08 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 10 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 12 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 111 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 16 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 18 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 20 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 22 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 211 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 28 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 30 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 32 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 311 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 36 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 38 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 40 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 42 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 411 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 110 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 112 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 60 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 62 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 611 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 70 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 80 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 90 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 100 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 110 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 120 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates
• 120 MM THICKNESS x WIDTH 1000 MM / 12110 MM / 11100 MM / 2000 MM / 21100 MM X LENGTH 1000 MM / 21100 MM / 3000 MM / 6000 MM / COIL CUT in SA387 Grade 11 Class 1/2, SA387 Grade 11 Alloy Steel Plates, SA387 Grade 11 Chrome Moly Plates

SA 387 Grade 11 Class 2 Alloy Steel Plates Export Country

We export SA387 Grade 11 Alloy Steel Plates to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Mayanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States of America, Canada, Mexico, Panama, Costa Rica, Puerto Rica, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherland, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East.etc.

Prosaic Steel and Alloys is a well known worldwide exporter of Prosaic Steel and Alloys is committed to provide each and every customer with the highest standard of customer service. We deals in SA387 Grade 11 Alloy Steel Plates in India & Overseas, offering a wide range of SA387 Grade 11 Alloy Steel Plates