SA 387 Grade 12 Class 1 is a specific type of low-alloy chromium-molybdenum steel plate designed for high-temperature, high-pressure applications like boilers and pressure vessels.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 620 B | 13 CRMO 45 | SA387-12-1 | 13 CRMO 44 |
Specifications for ASME SA387 Grade 12 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| SA387 Grade 12 | 1.00% | 0.50% |
Tensile Requirements for ASME SA387 Grade 12 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 12 |
| SA387 Grade 12 | Tensile strength, ksi [MPA] | 65 to 85 [450 to 585] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 40 [275] | |
| Elongation in 8 in. [200mm], min % | 19 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
Chemical Requirements for ASME SA387 Grade 12 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| ASME SA387 Grade 12 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Heat Analysis: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.15 - 0.40 |
| Product Analysis: | 0.13 - 0.45 | |
| Chromium: | Heat Analysis: | 0.80 - 1.15 |
| Product Analysis: | 0.74 - 1.21 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.60 |
| Product Analysis: | 0.40 - 0.65 |
Applications
Pressure Vessels
Ideal for fabricating vessels to contain pressurized liquids and gases in extreme high-temperature, high-pressure conditions, ensuring structural integrity and leak-proof performance.
Boilers
A core material for critical components in thermal power plant boilers and heavy-duty industrial boilers, withstanding prolonged thermal cycling and internal pressure loads.
Heat Exchangers
Widely adopted in petrochemical and chemical industries for building high-efficiency heat exchangers, enabling stable heat transfer while resisting media corrosion.
Storage Tanks
Suited for constructing tanks dedicated to storing high-temperature liquids and gases, providing excellent creep resistance to prevent deformation under long-term heat exposure.
Oil & Gas Industry
Perfect for sour service applications with hydrogen sulfide and key refinery equipment, effectively resisting sulfide stress cracking in harsh corrosive environments.
Chemical Equipment
Applied to manufacturing core components in chemical processing plants, capable of enduring the corrosive and high-temperature conditions of chemical reaction systems.
Power Generation
Used for fabricating various critical load-bearing components in power plants, supporting stable and continuous operation of thermal power generation systems.
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1.What is SA 387 GR 12 material?
Engineered for use in elevated temperature service, ASME SA387 Grade 12 is a chrome molybdenum carbon alloy steel for use in weldable pressure vessels and industrial boilers.
2.What is the difference between SA 387 Grade 12 CL 1 and Class 2?
SA 387 Grade 12 Class 1 and Class 2 have the same chemical composition (Cr-Mo), but differ in their mechanical properties, specifically strength and elongation, with Class 2 offering higher tensile and yield strength for more demanding elevated temperature applications, while Class 1 has lower strength requirements but generally better elongation. Class 2 plates undergo a stricter heat treatment, resulting in superior strength needed for critical pressure vessel service.
3.Is SA 387 carbon steel?
Weldable carbon steel plates for pressure vessels and boilers used in elevated temperatures. The material benefits from added chromium and molybdenum which gives the steel greater corrosion resistance and resistance to heat.