ASTM A387 Grade 22 Class 2 Pressire Vessel Steel Specification

ASTM A387 Grade 22 Class 2 Pressire Vessel Steel Specification

ASTM A387 grade 22 class 2 is ASTM A387 grade 22 steel in the normalized and tempered condition. The graph bars on the material properties cards below compare ASTM A387 grade 22 class 2 to: wrought alloy steels in the same category (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

ASTM A387 Grade 22 (ASME SA387 Grade 22) is a premium chromium-molybdenum alloy steel plate specifically designed for welded boilers and pressure vessels intended for high-temperature and high-pressure service. The chemical composition features a chromium content of 2.00% to 2.50% and a molybdenum content of 0.90% to 1.10%.

Performance Characteristics

The synergy between chromium and molybdenum provides these plates with exceptional performance capabilities:

Thermal Endurance: ASTM A387 Grade 22 Class 2 plates can operate at temperatures up to 600°C. Molybdenum enhances the lattice strain, increasing both high-temperature stability and tensile strength.

Corrosion Resistance: Higher chromium levels provide superior oxidation and corrosion resistance, preventing degradation from iron solutions and making the material compatible with sour services.

Fabrication Quality: This alloy is recognized for its excellent weldability, durability, and leak-proof characteristics, making it impeccable for easy installation in complex structures.

Industrial Applications

ASTM A387 Grade 22 Class 2 applies to a vast range of industries including oil & gas, petrochemical, marine, gas processing, food processing, paper, and pulp. Common specific applications include:

Pressure Equipment: Pressure vessels, heat exchangers, flanges, valves, and high-temperature ducting.

Heavy Infrastructure: Construction & bridges, offshore & onshore services, shipbuilding, and pipe clamps.

Wear Protection: Liners for chutes, tubs, and bins, truck body wear liners, and arc plate cyclones.

ASTM A387 GR 22 CLASS 2 Plate Specification

Grade : ASTM A387 Gr 22 CL.2 Alloy Steel Plates
Standard : ASTM A387 / ASME SA387
Width : 1000mm-4500mm
Thickness : 5mm-150mm
Length : 3000mm -18000mm
Impact tested : -52° C
Process : Hot-Rolled (HR)

Applications:

ASTM A387 Grade 22 steel plates are commonly used in:

Pressure vessels for the oil and gas industry

Heat exchangers

Boilers

Power generation equipment

Chemical processing plants

Can you provide a detailed breakdown of trace elements for ASTM A387 Grade 22 Class 2 ?

ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel for high-temperature pressure vessels, primarily defined by its 2.00-2.50% Chromium (Cr) and 0.90-1.10% Molybdenum (Mo) content, with strict limits on Carbon (C) (0.05-0.15%), Manganese (Mn) (0.30-0.60%), Silicon (Si) (0.50% max), Phosphorus (P) (0.035% max), and Sulfur (S) (0.035% max). Trace elements like Vanadium (V), Nickel (Ni), Copper (Cu), and Aluminum (Al) are usually kept very low or within specific ranges, with the Class 2 designation focusing on higher tensile strength compared to Class 1, notes Prosaic Steel and Alloys.

What is the maximum J-factor or X-factor guaranteed for ASTM A387 Grade 22 Class 2 heat ?

For ASTM A387 Grade 22 Class 2, the guaranteed maximums for J-factor (related to carbon equivalent for weldability) and X-factor (a specific measure in some specifications) are typically J < 100 and X ≤ 15, though these are often specified in supplementary requirements for specific applications like API 934 A, not the base ASTM standard itself, which focuses on chemistry and mechanicals.

Do you perform Simulated Post-Weld Heat Treatment (S-PWHT) on ASTM A387 Grade 22 Class 2 ?

Yes, Simulated Post-Weld Heat Treatment (S-PWHT) is commonly performed on ASTM A387 Grade 22 Class 2 (a 2.25Cr-1Mo low alloy steel) to improve its mechanical properties, especially toughness, by relieving residual stresses and modifying the microstructure in the Heat-Affected Zone (HAZ) after welding, a process often studied with Gleeble simulations. While actual PWHT depends on service conditions and code requirements (thickness, temperature), S-PWHT helps verify the heat treatment's effectiveness for the material, which can form brittle phases like martensite if not properly treated.

Equivalents for ASTM A387 Grade 22 Alloy Steel Plates

Specifications for ASTM A387 Grade 22 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)

Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates Class 2 Plates

Chemical Requirements for ASTM A387 Grade 22 Alloy Steel Plates

1What is ASTM A387 Grade 22 Class 2 material ?

ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel plate, specified for welded boilers and pressure vessels used in elevated temperature service, particularly in the oil, gas, and chemical industries, offering excellent heat resistance, oxidation resistance, and good weldability due to its 2.25% Chromium and 1.00% Molybdenum content, supplied normalized and tempered with higher strength requirements than Class 1.

2What is ASTM A387 Grade 22 Class 2 equivalent to ?

ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel for pressure vessels, with key equivalents being ASME SA387-22-2, EN 10CrMo9-10, and BS 622-515B, all indicating a material with 2.25% Chromium and 1.0% Molybdenum, suited for high-temperature service.

3What is the chemical composition of SA387 grade 22 class 2?

ASTM A387 GR 22 CL 2 Plates is designed with chemical compositions like carbon, manganese, phosphorus, molybdenum, chromium, silicon, and sulfur. This A387 alloy is constructed with various classifications like area reduction, elongation, yield strength, and high tensile strength.

4What are the primary advantages of ASTM A387 Grade 22 Class 2 ?

ASTM A387 Grade 22 Class 2 offers excellent high-temperature strength, superior oxidation/corrosion resistance (especially in sour service), good weldability, and improved toughness, making it ideal for pressure vessels, boilers, and heat exchangers in the oil, gas, and chemical industries where elevated temperatures and harsh conditions are common. Its key advantages stem from its chromium (2.25%) and molybdenum (1%) content, providing enhanced performance over standard carbon steels.

5What are the typical application fields of ASTM A387 Grade 22 Class 2 ?

ASTM A387 Grade 22 Class 2 steel is primarily used for welded boilers and pressure vessels in high-temperature, corrosive environments, particularly within the oil & gas, petrochemical, and chemical processing industries. Its chromium and molybdenum content provides excellent heat resistance, corrosion resistance, and strength for components like heat exchangers, piping, flanges, and power generation equipment.

6What precautions should be taken when welding ASTM A387 Grade 22 Class 2 ?

When welding ASTM A387 Grade 22 Class 2, a chromium-molybdenum alloy for high-temp service, strict precautions are needed, focusing on extensive preheating (around 150°C/300°F or higher), controlled heat input, interpass temperature control, low-hydrogen filler metals, and mandatory Post-Weld Heat Treatment (PWHT) to prevent hydrogen cracking, hard zones, and residual stress, ensuring stability for boilers and pressure vessels.

7What are Common Testing Requirements ASTM A387 Grade 22 Class 2 ?

For ASTM A387 Grade 22 Class 2, common testing includes tensile tests (strength 75-100 ksi, yield strength min 45 ksi, elongation min 18% in 2"), chemical analysis (2.25% Cr, 1.00% Mo), and often impact testing, hydrostatic testing, and ultrasonic examination, ensuring it meets requirements for pressure vessels with specified chromoly content and mechanical properties.

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