Is ASTM A387 Grade11 Class1 high speed steel?

Is ASTM A387 Grade11 Class1 high speed steel?

ASTM A387 Grade 11 Class 1 is not high-speed steel but a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, known for corrosion resistance, creep resistance, and strength in elevated temperature service, containing ~1.25% Chromium and ~0.50% Molybdenum, used in boilers, heat exchangers, and reactors in oil, gas, and power industries, differing from Class 2 by its specific mechanical properties (higherelongation).}

ASTM A387 Grade 11 Class 1 (SA 387 GR. 11 CL. 1) is a chromium-molybdenum alloy steel plate specifically intended for welded boilers and pressure vessels designed for elevated temperature service. Conforming to the ASTM A387 / SA 387 standard, this material serves as a steadfast solution in industrial contexts where gases and liquids endure extreme thermal conditions, such as the oil and gas sectors and the petrochemical industry.

The foundational elements of this alloy are precisely balanced to engender specific characteristics:

Chromium (1.25%): Enhances the alloy's resistance to corrosion and oxidation.

Molybdenum (0.50%): Provides strength and stability at high working temperatures.

The composition of these elements, coupled with distinct manufacturing conditions, results in variations between Class 1 and Class 2 plates. In the case of Class 1, the material is typically supplied in the annealed condition, offering a specific balance of ductility and strength. This careful configuration of elements ensures that ALLOY STEEL SA 387 GR. 11 CL. 1 plates provide the reliability required for critical pressure vessel applications across numerous industrial domains.

What is ASTM A387 Grade 11 Class 1 material?

ASTM A387 Grade 11 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate for high-temperature pressure vessels, boilers, and piping in industries like oil, gas, and petrochemicals, offering good strength, weldability, and resistance to oxidation/corrosion due to its ~1.25% Chromium and ~0.5% Molybdenum content, supplied normalized and tempered for demanding service.

What precautions should be taken when welding ASTM A387 Grade 11 Class 1?

When welding ASTM A387 Grade 11 Class 1, critical precautions involve proper preheating, controlled interpass temperatures, using low-hydrogen electrodes (like E8018-B2), slow cooling, and post-weld heat treatment (PWHT) to prevent cracking, alongside standard welding safety like good ventilation, appropriate PPE (hood, gloves, protective clothing), and keeping the area clear of flammables, ensuring the weld matches the base metal's high-temp strength and oxidation resistance.

What is the best way to cut ASTM A387 Grade 11 Class 1?

For ASTM A387 Grade 11 Class 1, plasma cutting is the most efficient method, though waterjet is best for avoiding heat damage. Due to the alloy content, preheating to 150°C is critical to prevent cracking, and cut edges must be ground clean before welding.

Dimension Range

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Alloy Steel ASTM A387 GR 11 CL. 1 / 2 Plates Chemical Composition :

Specifications for ASTM A387 Grade 11 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)

1What are the typical application fields ASTM A387 Grade 11 Class 1?

ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel primarily used for welded boilers and pressure vessels in high-temperature applications, especially in the oil, gas, and petrochemical industries for equipment like reactors, heat exchangers, and storage tanks needing strength and corrosion resistance at elevated temperatures, including sour gas service.

2Is ASTM A387 Grade 11 Class 1 high speed steel?

ASTM A387 Grade 11 Class 1 is not high-speed steel but a chromium-molybdenum alloy steel plate for high-temperature pressure vessels, known for corrosion resistance, creep resistance, and strength in elevated temperature service, containing ~1.25% Chromium and ~0.50% Molybdenum, used in boilers, heat exchangers, and reactors in oil, gas, and power industries, differing from Class 2 by its specific mechanical properties (higher elongation).

3What is ASTM A387 Grade 11 Class 1 equivalent material?

The most direct equivalent is ASME SA387 Grade 11 Class 1, which is essentially the same material specification but adopted by the American Society of Mechanical Engineers (ASME) for use in boiler and pressure vessel codes.

4What are Common Testing Requirements for ASTM A387 Grade 11 Class 1?

Common testing for ASTM A387 Grade 11 Class 1 includes tensile tests (strength, yield, elongation), chemical analysis (Cr, Mo, Si, C, P, S), and often Charpy V-Notch impact tests, with requirements for heat treatment (normalized & tempered) and optional supplementary tests like HIC or through-thickness testing for sour service. Key mechanicals are typically 75-100 ksi tensile, 43 ksi min yield, and 18-22% elongation, with specific chemical limits for its chromium-molybdenum alloy composition.

5Is ASTM A387 Grade 11 Class 1 steel hard to drill?

Yes, drilling ASTM A387 Grade 11 Class 1 (a Chrome-Moly alloy) can be challenging due to its hardness and tendency to work harden, similar to stainless steels, requiring slow speeds, strong lubrication, and carbide or cobalt bits to prevent dulling, but it's manageable with the right tools and technique, unlike truly "hard" steels.

6What are the primary advantages of ASTM A387 Grade 11 Class 1?

ASTM A387 Grade 11 Class 1's primary advantages are its excellent resistance to high-temperature oxidation, creep, and hydrogen attack, thanks to its ~1.25% Chromium (~Cr) and ~0.5% Molybdenum (~Mo) content, making it ideal for severe service in boilers, pressure vessels, and petrochemical equipment. It offers a good balance of high-temperature strength, durability, and corrosion resistance, extending the life of equipment in demanding environments like oil refineries and chemical processing plants.

7What is the P number of ASTM A387 Grade 11 Class 1?

The P-Number for ASTM A387 Grade 11 Class 1 (a chromium-molybdenum alloy steel) is P-Number 4, as it falls into the group of low alloy steels containing chromium and molybdenum, similar to other P-Number 4 materials like SA-335 P11 and SA-213 T11.

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