What are the primary advantages of ASME SA387 Grade 11 Class 2 ?

What are the primary advantages of ASME SA387 Grade 11 Class 2 ?

ASME SA387 Grade 11 Class 2 offers superior high-temperature strength, excellent corrosion/oxidation resistance (due to chromium & molybdenum), and enhanced toughness for demanding pressure vessel applications in oil, gas, and power industries, with Class 2 providing higher tensile strength and performance than Class 1, making it ideal for severe service where strength at elevated temps is critical.

SA387 Grade 11 Class 2 is a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, boilers, and heat exchangers, offering excellent strength and oxidation/corrosion resistance due to its 1-1.5% Chromium and 0.45-0.65% Molybdenum content, with Class 2 specifying higher mechanical strength (75-100 ksi tensile, 43 ksi yield) than Class 1.

ASME SA387 Grade 11 Class 2  Chrome Moly (Chromium Molybdenum) steel is alloyed with 1.25% Cr and 0.50% Mo. These special alloys together give the steel enhanced mechanical properties (tensile & yield) at high working temperatures, along with excellent corrosion and oxidation resistance.

With excellent resistance to high temperatures and corrosion, this type of steel is commonly used in the oil, gas and power generation industry, chemical processing and nuclear power generation facilities. Our stock is ordered with enhanced chemistry and is suitable for retesting on multiple PWHT (Post Weld Heat Treatment) cycles, to meet the most stringent design specifications. You can be rest assured that your equipment will be safe from corrosion and perform at high temperatures.

Key Characteristics:

Application:

Designed for elevated temperature service in welded boilers, pressure vessels, and heat exchangers (common in oil, gas, petrochemical industries).

Alloying Elements:

Contains about 1.25% Chromium (for oxidation/corrosion resistance) and 0.5% Molybdenum (for high-temp strength).

Class 2 Strength:

Specifies higher tensile strength (75-100 ksi or 515-690 MPa) and yield strength (min 43 ksi or 310 MPa) compared to Class 1.

Material:

Chromium-Molybdenum (Cr-Mo) Alloy Steel.

Benefits:

High-Temperature Performance: Maintains strength and integrity at elevated temperatures.

Corrosion Resistance: Chromium provides resistance to oxidation and corrosive environments, including "sour gas" (H₂S).

Weldability: Suitable for welding, essential for pressure vessel fabrication.

In Simple Terms: It's a tough, heat-resistant steel plate used to build things like large tanks and pipes that hold hot liquids or gases, ensuring they don't rust or break under pressure and heat.

What is the hardness of ASME SA387 Grade 11 Class 2 ?
ASME SA387 Grade 11 Class 2 doesn't have a single fixed hardness value but must meet minimum tensile properties, typically requiring a minimum yield strength of 310 MPa (45 ksi) and tensile strength between 515-690 MPa (75-100 ksi), with hardness varying based on thickness and heat treatment, but generally falling within Brinell ranges suitable for these strength levels, often around 130-170 HBW (Brinell hardness) for typical applications, though specific hardness testing (like Brinell, Rockwell) is required per project.

What are the typical application fields of ASME SA387 Grade 11 Class 2 ?
ASME SA387 Grade 11 Class 2 is primarily used for pressure vessels and boilers in high-temperature applications, especially within the oil, gas, and petrochemical industries, due to its chromium-molybdenum alloy composition offering excellent high-temperature strength, corrosion, and oxidation resistance. Key applications include heat exchangers, pipelines, storage tanks, flanges, and other processing equipment handling hot liquids and gases, even in sour (sulfidic) environments.

What is ASME SA387 Grade 11 Class 2 equivalent to?
ASME SA387 Grade 11 Class 2 is essentially the same as ASTM A387 Grade 11 Class 2, used interchangeably for Cr-Mo alloy steel in pressure vessels, with the key difference being the standard (ASME for boilers/pressure vessels, ASTM for general materials). Internationally, its closest equivalent is the British Standard BS 621B, while the European equivalent is EN 10028 13CrMoSi5-5, though not a direct match in all properties.

Equivalents

Chemical Requirements for ASME SA387 Grade 11 Alloy Steel Plates

Tensile Requirements for Class 2 Plates

1 How heavy is ASME SA387 Grade 11 Class 2?

SME SA387 Grade 11 Class 2 is a chrome-moly alloy steel for high-temp pressure vessels, known for its strength, not a specific weight, as its weight depends on plate dimensions (thickness, length, width) and density (around 7850 kg/m³ or 0.285 lbs/in³), with heavier weights for thicker plates, like a 4x8 ft plate weighing over 1300 lbs at 1-inch thickness. Its strength properties (tensile 75-100 ksi, yield 45 ksi min) are higher than Class 1, making it suitable for demanding applications.

2What is the P number of ASME SA387 Grade 11 Class 2 ?
Based on the ASME Boiler and Pressure Vessel Code (BPVC) Section IX, the P-number for ASME SA387 Grade 11 Class 2 is P-No. 4.

3What welding rod for ASME SA387 Grade 11 Class 2 carbon steel?
For ASME SA387 Grade 11 Class 2 (a 2.25% Cr-1% Mo low-alloy steel), you should use matching or equivalent 2.25Cr-1Mo welding consumables, such as AWS A5.28/A5.28M E80C-B2/ER80S-B2 for MIG/TIG or A5.5 E8018-B2 for SMAW (stick), ensuring proper preheat (around 149°C/300°F) and post-weld heat treatment (PWHT) for optimal mechanical properties, as this is a critical, code-specified material.

4Is ASME SA387 Grade 11 Class 2 high speed steel?
No, ASME SA387 Grade 11 Class 2 is not high-speed steel (HSS); it's a low-alloy chromium-molybdenum (Cr-Mo) steel specifically for high-temperature pressure vessels, offering excellent oxidation resistance and strength, unlike HSS used for cutting tools that need extreme hardness and wear resistance at high speeds.

5What temperature is ASME SA387 Grade 11 Class 2 ?
ASME SA387 Grade 11 Class 2 is a high-temperature alloy steel for pressure vessels, with its heat treatment requiring a minimum tempering temperature of 620°C (1150°F), and it's designed for service in elevated temperatures, often used in ranges like 350°C to 480°C (around 660°F to 900°F), offering good corrosion resistance in oil/gas applications.

5What is ASME SA387 Grade 11 Class 2 material?
ASME SA387 Grade 11 Class 2 is a chromium-molybdenum (Cr-Mo) alloy steel plate designed for welded boilers and pressure vessels in high-temperature service, offering excellent oxidation/corrosion resistance and strength due to its ~1.25% Chromium and ~0.5% Molybdenum content, making it ideal for oil, gas, and petrochemical applications. It's typically supplied normalized and tempered, balancing high-temp performance with good formability and weldability for critical pressure-containing equipment.

6Is ASME SA387 Grade 11 Class 2 carbon steel?
No, ASME SA387 Grade 11 Class 2 is not plain carbon steel; it's a chromium-molybdenum (Cr-Mo) alloy steel, a type of low-alloy steel specifically engineered for high-temperature pressure vessel applications, offering superior strength, oxidation, and corrosion resistance compared to carbon steel due to its added chromium and molybdenum content. While it has low carbon (around 0.04-0.17%), the alloying elements define it as a chromium-molybdenum steel, not a simple carbon steel.

7What precautions should be taken when welding ASME SA387 Grade 11 Class 2 ?
When welding SA387 Grade 11 Class 2 (a Cr-Mo alloy steel), key precautions involve mandatory preheating (around 149°C/300°F), appropriate filler metal (EB2 group), strict adherence to WPS/PQR, and Post-Weld Heat Treatment (PWHT) (around 690°C/1275°F) to prevent brittle martensitic phase formation and cracking, alongside standard safety (PPE, ventilation, fire watch).

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