SA 387 Gr 12 CL 2 is a chromium-molybdenum alloy steel plate specified for high-temperature, high-pressure service, typically used in welded boilers and pressure vessels. It has higher tensile strength than the CL 1 grade of the same steel series, with good heat resistance and weldability, making it suitable for more demanding industrial applications.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 620 B | 13 CRMO 45 | SA387-12-2 | 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 2 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 |
appplications
Pressure vessels and industrial boilers – drums, shells, steam drums, headers, water-wall panels, super-heater and re-heater supports in power plants, refineries and pulp & paper mills.
High-temperature heat exchangers & process piping – tube sheets, channels, shells and re-boilers in chemical, petro-chemical and gas-processing trains.
Sour-service oil & gas equipment – separators, absorbers, dehydration columns, gathering lines and well-head manifolds where wet H₂S is present (NACE MR-0175 compliant).
Power-generation components – reactor pressure vessels, steam generators and turbine casings for small modular reactors (SMR) and fossil-fired units operating up to ~450 °C.
Heavy-wall storage and transport tanks – spheres, bullets and road tankers for hot, high-vapour-pressure products such as LPG, anhydrous ammonia and light olefins .
If you want to learn more about (SA 387 Gr 12 CL 2)GNEE's products, you can send an email to beam@gneesteelgroup.com. We are more than happy to assist you.
1.What material is SA 387 GR 12 Cl 2?
SA 387 Grade 12 Class 2 is a chromium-molybdenum (Cr-Mo) alloy steel designed for high-temperature applications, primarily used for weldable pressure vessels, boilers, and piping in industries like oil & gas, offering good corrosion resistance, strength at elevated temperatures, and improved weldability due to its alloying elements. The "SA" signifies ASME (American Society of Mechanical Engineers) standard for pressure vessels, "Grade 12" denotes its specific composition (around 1% Cr, 0.5% Mo), and "Class 2" indicates its mechanical properties, often requiring normalization and tempering for specific tensile strength.
2.What is the SA 387 GR 12 Cl 2 equivalent to?
SA 387 Gr 12 Cl 2 (ASME/ASTM) is a chromium-molybdenum alloy steel for pressure vessels, with equivalents like EN 13CrMo4-5, DIN 13CrMo44, and BS 620B, all offering similar properties for high-temperature service with good corrosion resistance. It's essentially a higher strength version (Class 2) of the same chemistry as Grade 12 (Class 1).