A387 Grade 5 Class 2 is a chromium-molybdenum pressure vessel steel plate intended for service at elevated temperatures. It offers good strength and resistance to creep and oxidation, making it suitable for boilers and pressure vessels operating under harsh thermal conditions. The material is processed with controlled chemistry and heat treatment to ensure reliable mechanical properties.
Cr Mo Grade 5 Class 2 Plates Specification :
Thickness : 6mm to 300mm
Width : 1500mm to 4050mm,
Length : 3000mm to 15000mm
Production : Hot-Rolled (HR) / Cold-Rolled (CR)
Heat Treatment : Rolled/Normalised/N+T/QT
Dimension range : 1.5mm -260mm x 1000mm-4000mm x 1000mm-18000mm
Equivalent Grades of A387 Grade 5 Cl 2 Chromium Molybdenum Alloy Steel Plates:
| BS | EN | ASTM/ASME | DIN |
| - | X12CrMo5 | A387 / SA 387 | - |
Chemical Composition Of ASTM A387 grade 5 Class 2 Alloy Steel Plates
| Chemical Composition | |||||||
| C | Mn | P | S | Si | Cr | Mo | V |
| 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 4.00-6.00 | 0.45-0.65 | - |
Applications For A387 Gr.5 Class 2 Alloy Steel Plate
Weldable Pressure Vessels and Industrial Boilers: It is widely used in manufacturing weldable pressure vessels and industrial boilers, which are core equipment in petrochemical, power generation and chemical industries. Its excellent high-temperature resistance ensures stable operation under long-term thermal load, avoiding deformation or failure caused by high temperature and pressure.
Sour Service Environments: The alloy steel plate performs well in sour service environments containing hydrogen sulfide. It can resist hydrogen-induced cracking and sulfide stress corrosion, ensuring safe operation of equipment in harsh oil and gas extraction and processing environments.
Numerous Applications: Beyond core industries, it is also applied in thermal processing equipment, high-temperature pipelines and chemical reaction vessels. It adapts to diverse working conditions, becoming a preferred material in high-temperature and high-pressure industrial fields.
Gas Applications: It is suitable for gas transmission, storage and processing equipment. Whether for natural gas, coal gas or other industrial gases, it can withstand the corrosion and pressure of gas media, ensuring efficient and safe gas transportation and utilization.
Benefits of ASTM A387 Grade 5 Class 2 Steel Plate
High Strength & Efficiency: With outstanding high-temperature strength, it maintains structural integrity under extreme pressure, improving equipment operation efficiency and reducing energy consumption caused by material deformation.
High Performance: It integrates high-temperature resistance, corrosion resistance and creep resistance, showing stable performance in complex working conditions and meeting strict industrial operation standards.
Longer Life Span: The reasonable alloy composition and strict heat treatment process extend its service life, reducing equipment maintenance frequency and replacement costs for enterprises.
Flawless Finish: Precision processing ensures a smooth and flawless surface, avoiding stress concentration caused by surface defects and enhancing the overall structural stability of equipment.
Durable & Corrosion Resistant & High Temperature Resistant: It is highly durable, resists corrosion from acidic, alkaline and gas media, and endures high temperatures without performance degradation, adapting to harsh industrial environments.
Good Weldability: Easy to weld with stable weld quality, facilitating equipment fabrication and on-site maintenance, improving production efficiency.
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What is the typical hardness range of ASTM A387 Grade 5 Class 2?
ASTM A387 Grade 5 Class 2 typically has a hardness range between 137 and 197 HB. This range ensures a good balance of strength and toughness, making it suitable for pressure vessel components that require reliable performance at elevated temperatures.
How does ASTM A387 Grade 5 Class 2 compare to ASTM A537 Class 1?
ASTM A387 Grade 5 Class 2 is a chromium-molybdenum alloy steel designed for high-temperature service, while ASTM A537 Class 1 is a quenched and tempered carbon steel for pressure vessels. Grade 5 Class 2 provides better creep resistance, while Grade 537 Class 1 offers high strength at lower temperatures.
What is the impact toughness requirement for ASTM A387 Grade 5 Class 2?
ASTM A387 Grade 5 Class 2 must meet specified Charpy V-notch impact toughness requirements at low temperatures. These requirements ensure that the material remains ductile and resistant to brittle fracture, even in cold environments or during startup and shutdown cycles.
What thickness range is ASTM A387 Grade 5 Class 2 available in?
ASTM A387 Grade 5 Class 2 is commonly produced in thicknesses from 1/4 inch to several inches. Thicker plates may require additional heat treatment to ensure uniform mechanical properties throughout the section, especially for pressure vessel applications.
What standards govern the testing of ASTM A387 Grade 5 Class 2?
Testing of ASTM A387 Grade 5 Class 2 is governed by ASTM standards, including tensile, bend, and impact tests. Additional requirements may be specified by ASME Boiler and Pressure Vessel Code when used in certified pressure vessel construction.
What is the density of ASTM A387 Grade 5 Class 2?
The density of ASTM A387 Grade 5 Class 2 is approximately 0.284 lb/in³, similar to other carbon and low-alloy steels. This density is used in weight calculations for pressure vessel components and structural designs.
What is the modulus of elasticity of ASTM A387 Grade 5 Class 2?
The modulus of elasticity for ASTM A387 Grade 5 Class 2 is about 29,000 ksi at room temperature. This value is typical for carbon and low-alloy steels and is used in structural and pressure vessel design calculations.
What is the coefficient of thermal expansion for ASTM A387 Grade 5 Class 2?
ASTM A387 Grade 5 Class 2 has a coefficient of thermal expansion similar to other low-alloy steels, approximately 6.5 × 10⁻⁶ per °F between 70°F and 600°F. This property is important for designing components subject to thermal cycling.
What is the thermal conductivity of ASTM A387 Grade 5 Class 2?
The thermal conductivity of ASTM A387 Grade 5 Class 2 is around 25 Btu/(hr·ft·°F) at room temperature, decreasing slightly at higher temperatures. This property influences heat transfer efficiency in boilers and heat exchangers.
What is the electrical resistivity of ASTM A387 Grade 5 Class 2?
ASTM A387 Grade 5 Class 2 has an electrical resistivity similar to other low-alloy steels, approximately 20 × 10⁻⁸ ohm-meters at room temperature. This property is generally not a primary consideration for its typical pressure vessel applications.
What are the storage and handling recommendations for ASTM A387 Grade 5 Class 2?
ASTM A387 Grade 5 Class 2 plates should be stored in a dry, covered area to prevent corrosion. They should be handled with care to avoid surface damage, and proper lifting equipment should be used to prevent bending or deformation. Plates should be inspected before fabrication to ensure they meet specification requirements.