SA 387 Grade 12 Class 1 is a chromium-molybdenum alloy steel plate for high-temperature, high-pressure welded boilers and pressure vessels, offering good corrosion/oxidation resistance and strength.
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% |
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
Oil & GasIdeal for sour service applications with hydrogen sulfide, heavy-duty transportation pipelines, and large-capacity storage tanks, effectively resisting sulfide stress cracking and high-temperature corrosion in harsh extraction and processing environments.
Petrochemical & ChemicalA preferred material for fabricating pressure vessels, high-efficiency heat exchangers, and core process equipment, delivering stable performance amid continuous chemical reactions and cyclic temperature fluctuations.
Power GenerationWidely adopted for industrial boilers, high-pressure steam systems, and critical high-temperature components, maintaining excellent creep resistance to support long-term uninterrupted power generation operations.
RefineriesSuited for key equipment operating in high-pressure and high-temperature environments, withstanding the combined stress of hydrocarbon processing, thermal cycling, and corrosive media erosion.
Advantages
High-Temperature Strength: Retains strength and structural integrity in elevated temperature service.
Corrosion Resistance: Chromium provides superior resistance to oxidation and various corrosive media, including sour environments.
Weldability: Engineered for welding into complex structures like pressure vessels and boilers.
Durable: Offers long-term performance and reduced maintenance in harsh industrial settings.
Versatility: Applicable across numerous heavy industries requiring robust, heat-resistant materials.
If you have project requirements for SA 387 Grade 12 Class 1, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
1.What is SA 387 12 cl1material?
SA 387 Grade 12 Class 1 (SA387 Gr.12 Cl.1) is a chromium-molybdenum alloy steel plate standard (ASME/ASTM) designed for weldable pressure vessels and boilers used in high-temperature service, offering good strength and resistance to oxidation and corrosion due to its Cr and Mo content, making it suitable for oil & gas and chemical applications.
2.What is SA 387 Grade 12 CL 1 steel equivalent to?
SA 387 Grade 12 Class 1 is a chrome-molybdenum alloy steel for high-temperature pressure vessels, with equivalents including ASTM A387 Grade 12 Class 1, European EN 13CrMo4-5, German DIN 13CrMo44, British BS 620B, and French AFNOR 36206 15CD2.05, all offering similar corrosion and oxidation resistance due to their ~1% Cr and ~0.5% Mo content.