What is SA 387 GR 12 equivalent material?
The Equivalent materials of Sa 387 Gr 12 are BS 620B, UNS K11757, A387 / SA 387, DIN 13 CRMO 44, and EN 3 CRMO 45.
SA 387 Gr. 12 (equivalent to ASTM A387 Grade 12) is a 1% Chromium, 0.5% Molybdenum alloy steel plate for pressure vessels. Its equivalents are standardized across major international codes for plates, pipes, and fittings.
1. Direct International Plate Equivalents (Pressure Vessel Plate)
| Standard | Grade Designation | Status / Note |
|---|---|---|
| ASTM/ASME SA-387 | Grade 12, Class 1 or 2 | The base ASME/ASTM specification. |
| EN 10028-2 (Europe) | 13CrMo4-5 | The closest European equivalent. Note: 13CrMo4-5 is often used equivalently for both Gr.11 and Gr.12, requiring careful chemical range review. |
| JIS G3115 (Japan) | SCMV 410 | |
| GB 713 (China) | 14Cr1MoR or 15CrMoR | 15CrMoR (~1.5%Cr) is more common and slightly higher in Cr; Gr.12 may be matched by 14Cr1MoR or special order. |
2. Equivalent Material in Other Product Forms (U.S. Standards)
| Product Form | ASTM/ASME Specification | Equivalent Grade | Common Use |
|---|---|---|---|
| Seamless Pipe | ASTM A335 / ASME SA335 | P12 | High-temperature piping. |
| Fittings & Forgings | ASTM A182 / ASME SA182 | F12 | Flanges, elbows, valves. |
| Seamless Tube | ASTM A213 / ASME SA213 | T12 | Boiler and heat exchanger tubes. |
| UNS Number | Unified Numbering System | K11564 | Cross-reference alloy identifier. |
3. Important Technical Note on "Equivalence"
While the materials above are chemically similar, they are not automatically interchangeable in design. Key checks are required:
Precise Chemical Ranges: Minor differences in Cr, Mo, or impurity limits (e.g., S, P) can affect weldability and high-temperature performance.
Heat Treatment Condition: Class 1 (normalized) vs. Class 2 (normalized & tempered) must match the design requirement.
Governing Code: The construction code (ASME Sec. VIII, EN 13445, etc.) dictates which material specifications are acceptable. Substitution usually requires formal approval by the responsible engineer and compliance with original design calculations.
What is the chemical composition of ASTM A387 Grade 12?
ASTM A387 GR 12 CL 2 Plates is designed with chemical components such as silicon, chromium, vanadium, molybdenum, sulfur, phosphorus, carbon, and manganese. Alloy Gr 12 has some tensile requirements, such as tensile strength, area reduction, elongation, and yield strength.
What is the difference between A182 and A387?
The ASTM A182 standard covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves, while ASTM A387 specifies chromium-molybdenum alloy steel plates, intended for use in pressure vessels and boilers at high temperatures.
What is SA 387 GR 12 equivalent material?
SA 387 GR.12 Equivalent Grades :
| BS | ASTM/ASME | DIN |
|---|---|---|
| 620B | A387 / SA 387 | 13 CRMO 44 |
1. What are the main advantages of choosing A387 Grade 12 Class 1 over carbon steel for a pressure vessel?
This question focuses on the economic and performance rationale for upgrading from carbon steel, typically for moderate temperature service where Grade 12 offers improved strength and oxidation resistance at a reasonable cost increase.
2. Why might an engineer specify Grade 12 instead of the more common Grade 11?
This question explores the trade-off between material performance and project economics, as Grade 12 offers a cost-saving option when the service conditions are within its more limited high-temperature and corrosion resistance capabilities.
3. What are the primary high-temperature limitations of A387 Grade 12 compared to Grade 11?
This question addresses the technical boundaries of the alloy, focusing on its lower chromium and molybdenum content which results in reduced oxidation resistance, creep strength, and hydrogen attack resistance at elevated temperatures.
4. How does the heat treatment and welding procedure for Grade 12 Class 1 compare to that for carbon steel?
This question highlights the fabrication implications of using a low-alloy steel, noting that while similar to carbon steel, it generally requires stricter preheat, controlled cooling, and mandatory Post-Weld Heat Treatment (PWHT) to achieve optimal properties.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
