SA 387 Gr 11 Cl 1 refers to a specific type of Chromium-Molybdenum alloy steel plate (ASTM A387/ASME SA387 Grade 11, Class 1) designed for elevated-temperature service in welded boilers and pressure vessels, featuring around 1.25% Chromium and 0.5% Molybdenum, offering good strength, thermal stability, and corrosion resistance, crucial for industries like oil & gas, power, and chemical processing.
SA 387 GR 11 CL 1 Plates Mechanical Properties
| Tensile strength, min, (MPa) | Yield strength, min, (MPa) | Elongation, min, (%), L/T |
| 415 Mpa | 205 Mpa | 20 % |
SA 387 GR 11 CL 1 Plates Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Mo |
| Gr 11 | 0.15 max | 0.3-0.6 | 0.030 max | 0.030 max | 0.5-1 max | 1 – 1.5 | 0.44-0.65 |
SA 387 GR 11 CL 1 Plates Equivalent Grades
| Grade | ASTM/ASME | UNS | BS | DIN | EN |
| Alloy Steel Plates | A387 / SA 387 | K11789 | 621 B | – |
– |
Primary Applications
1.Pressure Vessels & Boilers
This material acts as a core structural component for fabricating pressure vessels and boilers specifically designed to operate under elevated temperature conditions. It is engineered to withstand the synergistic effects of high internal pressure and sustained thermal stress, rendering it ideal for critical equipment including industrial steam boilers, shell-and-tube heat exchangers, and pressure vessels deployed in high-temperature chemical manufacturing processes. Its outstanding creep resistance and thermal stability ensure long-term operational safety and reliability, even when subjected to continuous high-temperature cycling and frequent thermal shock scenarios.
2.Oil & Gas Industry
It boasts extensive applications across the upstream, midstream, and downstream sectors of the oil and gas industry. In downstream operations, it is widely adopted in refineries and chemical plants for fabricating reactors, fractionation columns, and storage tanks that handle hot hydrocarbons, corrosive media, and process fluids. In upstream and midstream segments, it is a preferred material for offshore drilling platforms, subsea pipelines, and onshore processing facilities, particularly for systems involved in storing and transporting sour gas (H₂S-containing gas). Its superior corrosion resistance against sulfide stress cracking (SSC) and chloride-induced corrosion enables it to perform reliably in harsh, high-pressure, and high-temperature oilfield environments.
3.Power Generation
It plays a pivotal role in the power generation sector, especially in systems operating under high-temperature conditions. It is extensively used in thermal power plants for fabricating key components of boiler systems, such as superheater tubes, reheater tubes, and header pipes, which are exposed to high-temperature flue gases and superheated steam. Additionally, it is applied in combined-cycle power plants for manufacturing heat recovery steam generators (HRSGs), facilitating efficient heat transfer between exhaust gases from gas turbines and water to produce high-pressure steam for power generation. Its excellent high-temperature strength and oxidation resistance ensure the structural integrity and operational efficiency of these critical power generation systems over long service lives.
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.
1.What is SA 387 GR 11 CL 1 equivalent material?
Sa 387 Gr 11 Cl 1 is a versatile class of the Sa 387 11 grade. Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.
2.What is SA 387 GR 11?
SA 387 Grade 11 is a pressure vessel grade steel popular for use in high-temperature assignments based on its high tolerance to high temperatures.
3.What is the price of SA 387 GR 11?
Alloy Steel Plate SA 387 GR 11 at ₹ 80/kilogram(s)