Alloy Steel Grade 5 Explained
Alloy Steel Grade 5 is a chromium-molybdenum alloy steel known for its good strength, excellent oxidation resistance, and reliable performance at moderately high temperatures. It is widely used in heat exchangers, boilers, pressure vessels, and high-temperature piping systems in power and process industries. The presence of chromium improves corrosion and oxidation resistance, while molybdenum enhances strength at elevated temperatures. Offering a balanced combination of thermal stability, mechanical strength, and weldability with proper heat treatment, Alloy Steel Grade 5 sheets and plates are a dependable choice for long-term high-temperature service.
GR 5 ALLOY STEEL SHEETS AND PLATES EQUIVALENT GRADES
| MATERIAL | STANDARD | UNS |
|---|---|---|
| X12CrMo5 | A387 / SA 387 | S50200 |
SPECIFICATION OF ALLOY STEEL GR 5 SHEETS AND PLATES
| Standard | ASTM A387 / ASME SA387 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF ALLOY STEEL GR 5 SHEETS AND PLATES
| C% | Mn% | P% | S% | Si% | Cr% | Mo% |
|---|---|---|---|---|---|---|
| 0.15 max | 0.25-0.66 | 0.035 max | 0.030 max | 0.55 max | 3.9-6.1 | 0.40-0.7 |
MECHANICAL PROPERTIES OF ALLOY STEEL GR 5 SHEETS AND PLATES
| Property | Class 1 | Class 2 |
|---|---|---|
| Tensile Strength (ksi) | 60-85 | 75-100 |
| Tensile Strength (MPa) | 415-585 | 515-690 |
| Yield Strength (ksi) | 30 | 45 |
| Yield Strength (MPa) | 205 | 310 |
| Elongation in 50mm (%) | 18 | 18 |
| Reduction of area (%) | 45 | 45 |
💡 Practical Difference in Use
Use Alloy Steel Grade 5 when: high-temperature strength, excellent toughness, and good creep resistance are required along with reliable weldability and machinability. → Example: steam turbines, pressure vessels, high-temperature piping systems, and power generation equipment.
Applications of Alloy Steel Grade 5 Sheets and Plates
Alloy Steel Grade 5 is a medium-alloy steel containing chromium and molybdenum, designed to maintain strength at elevated temperatures and resist oxidation and creep.
- Power Generation Equipment: Turbine components, boiler parts, and heat exchangers.
- Pressure Vessels: High-pressure containers and chemical reactors.
- Piping Systems: High-temperature and high-pressure pipelines in refineries and power plants.
When to Choose Alloy Steel Grade 5?
Alloy Steel Grade 5 is selected when operating conditions involve high temperatures, pressure, and cyclic loading, where standard carbon steels would fail.
Choose Alloy Steel Grade 5 when:
- Service involves high temperatures up to 600–650°C
- High strength and toughness are required under cyclic stress
- Resistance to creep and oxidation is critical
- Used in boilers, turbines, and power plant components
- Fabrication and weldability are important for complex assemblies
Industries That Use Alloy Steel Grade 5 Sheets and Plates
Alloy Steel Grade 5 sheets and plates are commonly used in industries where high-temperature performance, durability, and safety are critical.
Primary application due to high-temperature strength and creep resistance.
Uses
Boilers, steam turbines, and heat exchangers.
Why Alloy Steel Grade 5?
Exceptional performance under high-temperature and pressure conditions.
Used for high-pressure and high-temperature piping and vessels.
Uses
Pressure vessels, reactor shells, and piping systems.
Why Alloy Steel Grade 5?
Excellent toughness and resistance to thermal fatigue.
Used in high-pressure and high-temperature marine equipment.
Uses
Steam lines, boiler tubes, and turbine components.
Why Alloy Steel Grade 5?
High creep and corrosion resistance for offshore applications.
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