What is the P number of ASME SA387 | Grade 11 Class 1?

What is the P number of ASME SA387 | Grade 11 Class 1?

For ASME SA387 Grade 11 Class 1, the P-Number is 4, as it's a chromium-molybdenum alloy steel used for elevated temperature service, falling into the P-No. 4 group for steels with up to 2% Chromium and up to 0.5% Molybdenum.

ASME SA387 Grade 11 Class 1 is a specialized chromium-molybdenum alloy steel plate intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service. Mirrors its widespread usage in the industry, ALLOY STEEL SA 387 GR. 11 CL. 1 / 2 plates assume a prominent role due to their ability to withstand extreme thermal conditions. These plates emerge as a steadfast solution in contexts where gases and liquids endure elevated temperatures, offering excellent resistance to oxidation and corrosion-especially in "sour" (hydrogen sulfide) gas environments.

The preeminence of these plates is fundamentally dictated by their chemical composition. ALLOY STEEL SA 387 GR. 11 CL. 1 / 2 incorporates an array of elements, including approximately 1.25% Chromium and 0.50% Molybdenum. The concentration of these introduced elements is contingent upon the specific alloy composition:

Chromium: Enhances resistance to oxidation and chemical corrosion.

Molybdenum: Provides increased tensile strength and creep resistance at high working temperatures.

The composition of these elements, coupled with distinct manufacturing conditions, engenders variation in the characteristics of each plate. While Grade 11 Class 1 and Class 2 share the same chemical base, Class 1 indicates specific mechanical properties, such as a lower tensile strength range and higher elongation compared to Class 2. This diversity underscores the critical role these plates play in strategic employment within the oil and gas sectors, the petrochemical industry, and numerous other industrial domains.

Applications:

Power plants,

refineries,

petrochemical facilities,

heat exchangers,

storage tanks,

pipelines.

What are the primary advantages of ASME SA 387 Grade 11 Class 1?

ASME SA 387 Grade 11 Class 1 offers advantages in high-temperature, corrosive environments due to its chromium-molybdenum alloy composition, providing excellent strength, toughness, and resistance to creep, making it ideal for pressure vessels in power, petrochemical, and oil/gas industries, with good weldability for fabrication. Its durability and high performance lead to extended service life and lower maintenance costs in demanding conditions.

What are Common Testing Requirements of ASME SA 387 Grade 11 Class 1?

ASME SA 387 Grade 11 Class 1 requires chemical analysis (Carbon, Manganese, Phosphorus, Sulfur, Chromium, Molybdenum), tensile tests (Tensile Strength, Yield Strength, Elongation), and often impact (Charpy V-notch) and ultrasonic testing (UT) for quality assurance, ensuring it meets standards for elevated temperature pressure vessel service, with Class 1 having lower strength requirements than Class 2.

What is ASME SA 387 Grade 11 Class 1 equivalent to?

ASME SA 387 Grade 11 Class 1 is a chromium-molybdenum alloy steel for pressure vessels, with its main international equivalent being BS 621B, while its direct ASTM counterpart is ASTM A387 Grade 11 Class 1, sharing the same chemical composition (1.25% Cr, 0.5% Mo) but differing in mechanical properties (lower strength, higher elongation) from Class 2.

Alloy steel ASME SA387 GR. 11 CL. 1/ 2 Plates Mechanical Properties :

Dimension Range SA 387 GR. 11 CL. 1 Alloy Steel

1. What are the typical application fields of ASME SA 387 Grade 11 Class 1?

ASME SA 387 Grade 11 Class 1 is a chromium-molybdenum alloy steel primarily used for pressure vessels, boilers, and heat exchangers in high-temperature environments, especially in the oil, gas, and petrochemical industries, due to its excellent corrosion, oxidation resistance, and high tensile strength at elevated temperatures. It's also found in power generation, chemical processing, and other heavy industries requiring robust materials for extreme conditions.

2. Which Ultrasonic Testing (UT) standard will be applied for ASME SA 387 Grade 11 Class 1?

For ASME SA 387 Grade 11 Class 1 steel plates, the applicable ultrasonic testing (UT) standards are typically ASTM A435/A435M for basic straight-beam examination or ASTM A578/A578M for straight-beam UT in special applications, but the specific standard depends on the project's requirements, often referencing general ASME Section V rules and potentially API RP 577 for pressure vessel integrity, ensuring procedure compliance with requirements like Table T-421 in ASME Section V.

3. What is the composition of ASME SA387 | Grade 11 Class 1?

ASME SA387 Grade 11 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel with approximately 1.25% Chromium (Cr) and 0.5% Molybdenum (Mo), designed for high-temperature pressure vessels and boilers, offering excellent oxidation and creep resistance, with key elements like Carbon (C), Manganese (Mn), Silicon (Si), Phosphorus (P), and Sulfur (S) also controlled within specified limits for high-temp strength and durability, especially in sour gas conditions.

4. What precautions should be taken when welding ASME SA 387 Grade 11 Class 1?

When welding ASME SA 387 Grade 11 Class 1, key precautions involve using appropriate compatible filler metals (like E8018-B2/ER80S-B2), ensuring thorough preheating (around 150-250°C is typical for similar low-alloy steels) and post-weld heat treatment (PWHT), controlling interpass temperatures, properly cleaning surfaces, and adhering strictly to a qualified Welding Procedure Specification (WPS) to manage cracking risks in this low-alloy chromium-molybdenum steel.

5. What is the maximum J-factor or X-factor (Bruscato factor) guaranteed for ASME SA 387 Grade 11 Class 1 heat?

For ASME SA 387 Grade 11 Class 1, the guaranteed maximum Bruscato Factor (J-Factor) is typically J < 130, with a corresponding maximum X-Factor (X) of X ≤ 15, as specified by codes like API 934C for controlling temper embrittlement, though these limits are material-specific and depend on the actual chemistry of the heat.

6. Will the material be delivered in a Normalized and Tempered (N+T) condition requirements for ASME SA 387 Grade 11 Class 1?

Yes, ASME SA 387 Grade 11 Class 1 material is commonly supplied in the Normalized & Tempered (N+T) condition, as this heat treatment refines grain structure and improves mechanical properties for high-temperature pressure vessel service, though purchasers can specify other treatments like Quenched & Tempered (Q+T) if required. The N+T condition provides a good balance of strength, ductility, and toughness, making it ideal for elevated temperature applications.

7. What is ASME SA 387 Grade 11 Class 1 material?

ASME SA 387 Grade 11 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, specified for welded boilers and pressure vessels requiring high-temperature service, featuring approximately 1.25% Chromium and 0.5% Molybdenum for enhanced strength and corrosion resistance at elevated temperatures, with Class 1 denoting a specific tensile strength level. It's widely used in the oil, gas, and petrochemical industries for equipment like heat exchangers and industrial boilers.

Contact now

For more details about GNEE's steel products, contact us at info@gneesteels.com. We look forward to working with you.