ASTM A387 grade 11 class 1 is ASTM A387 grade 11 steel in the annealed condition.
ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, offering good high-temp strength, oxidation/corrosion resistance, and weldability, with specific chemical (1-1.5% Cr, 0.45-0.65% Mo) and mechanical properties (tensile strength 60-85 ksi), typically supplied normalized or annealed for applications like petrochemical reactors. Class 1 indicates a lower tensile strength range than Class 2, with less stringent impact toughness requirements, making it suitable for equipment needing high reliability at elevated temperatures.
ASTM A387 Gr 11 CL 1 is a chromium molybdenum alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. The Cr content 1.25% and the Mo content 0.5%.
ASME SA 387 GR.11 CL.1PLATES are alloy steel plates that are formed with chromium- molybdenum content. In addition to it includes other content such as nickel, tungsten, columbium, and aluminum. These additional elements offer superior resistance to corrosion and high-temperature tensile strength. These plates are ideal in that circumstance where hot liquids and gases are carried out frequently. The plates have a superior capability to tolerate high temperatures in tough circumstances. The plates are basically annealed in various situations that enable superior strength. Thus the addition of chromium content ensures superior resistance to oxidation and oxygen.
Key Characteristics:
Material Type: Alloy Steel Plate.
Application: Designed for welded boilers and pressure vessels operating at elevated temperatures, common in the oil, gas, and petrochemical industries.
Composition: Contains approximately 1.00-1.50% Chromium (Cr) and 0.45-0.65% Molybdenum (Mo).
Properties: Offers excellent resistance to oxidation and hydrogen corrosion, good high-temperature strength, and toughness.
Delivery Condition: Usually supplied in a normalized or annealed condition, often with tempering.
Typical Uses:
Hydrogenation reactors.
Synthesis towers.
Power plant boilers.
Production Size: Thickness: 4mm- 400mm; Width: 1000mm- 4000mm; Length: 4000mm- 12000mm.
Production ability:10000 Tons Per Month.
Production Way: Hot Rolled, Annealing, Normalizing, Tempering.
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | A387-11-1 | ––– |
Specifications for ASTM A387 Grade 11 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 11 | 1.25% | 0.50% |
Tensile Requirements for ASTM A387 Grade 11 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 11 |
| A387 Grade 11 | Tensile strength, ksi [MPa] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 43 [310] | |
| Elongation in 8 in. [200mm], min % | 18 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
Alloy Steel ASTM A387 GR 11 CL. 1 Plates Chemical Composition :
| C | Mn | P | S | Si | Cr | Mo |
| 0.04 - 0.17 | 0.35 - 0.73 | 0.035 | 0.035 | 0.44 - 0.86 | 0.94 - 1.56 | 0.40 - 0.7 |
1 What is ASTM A387 Grade 11 Class 1 material?
ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel plate designed for high-temperature pressure vessels, offering good high-temp strength, oxidation resistance, and weldability, containing about 1-1.5% Cr and 0.45-0.65% Mo, and is supplied normalized or annealed for critical applications like petrochemical reactors. The 'Class 1' designation means it meets specific tensile strength levels (around 515-690 MPa), with Class 2 requiring stricter low-temperature impact toughness.
2What is ASTM A387 Grade 11 Class 1equivalent to?
ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel for high-temperature pressure vessels, with its direct equivalent being ASME SA-387 Grade 11 Class 1, while its British Standard (BS) equivalent is BS 621B, both sharing similar compositions (around 1.25% Cr, 0.5% Mo) and mechanical properties, primarily for boiler and reactor applications.
3 What is the difference between ASTM A387 Grade 11 Class 1 and ASME SA-387 Grade 11 Class 1?
There is no practical difference; ASTM A387 Grade 11 Class 1 and ASME SA-387 Grade 11 Class 1 are essentially the same material, with ASME adopting ASTM's standards, so the "SA" prefix just indicates it's under ASME Boiler & Pressure Vessel Code rules, while the core composition and properties (strength, ductility, Cr-Mo content for high-temp service) for both are identical for Grade 11 Class 1.
4What is the hardness of ASTM A387 Grade 11 Class 1?
ASTM A387 Grade 11 Class 1 steel typically has a Brinell hardness range of 150 to 180 HBW, although some sources suggest it can be around 235 HBW in the as-rolled condition, but this is a general guideline; actual hardness depends on specific heat treatment and processing, with other properties like tensile strength being 415-585 MPa (60-85 ksi).
5What temperature is ASTM A387 Grade 11 Class 1?
ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel for high-temperature service, used in pressure vessels and boilers, with typical operating temperatures often in the 350-540°C (660-1000°F) range, depending on the specific ASME code and application, though it's tempered around 620°C (1150°F) for strength. Its maximum use temperature is limited by the relevant ASME code, often around 649°C (1200°F) for some applications, but lower for others like nuclear services.
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