What is ASME SA387 Grade 22 Class 1 equivalent to？

What is ASME SA387 Grade 22 Class 1 equivalent to?

ASME SA387 Grade 22 Class 1 is a chromium-molybdenum alloy steel for high-temperature pressure vessels, with its closest international equivalents being ASTM A387 Grade 22 Class 1, EN 10CrMo9-10, and DIN 10CrMo9-10, sharing nearly identical composition and properties for elevated service. Other equivalents include BS 622-515B, AFNOR 36206, and Gost 10KH2M, all suitable for similar demanding industrial applications like boilers and heat exchangers.

ASME SA387-22 steel plate is a pressure vessel grade steel specially designed for use in elevated temperature service and applications in which sour gas is present.

A387 Grade 22 CL2 under steel specification standard ASTM A387/A387M and ASME SA387/SA387M are popularly used for welded boilers and pressure vessels designed for elevated temperature service.The main different between steel plate SA387 Grade 22 CL 1 and SA387 Grade 22 CL 2 is the mechanical properity,for pressure vessel steel plate A387 Grade 22 CL 1,the tensile strength shall be 415-585 Mpa,minimum yield point is 205 Mpa.And for pressure vessel steel plate A387 Grade 22 CL 2,the minimum yield strength shall be 310 Mpa,tensile strength within 515-690 Mpa.
Heat Treatment for SA387 Chrom Moly Alloy Steel Plate

Chrome moly alloy steel plate under ASME SA387 shall be killed steel, with thermally treated either by annealing, normarlizing and tempering. Or in case agreed by buyer, accelerated cooling from the austenitizing temperature by air blasting or liquid quenching, followed by tempering, minimum tempering temperatures shall be as below table:

Key Characteristics:

Material Type: Chromium-Molybdenum (Cr-Mo) Alloy Steel.

Application: Welded boilers, pressure vessels, heat exchangers, and pipelines in elevated temperature service.

Performance: Good resistance to high temperatures, corrosion, and sour (hydrogen sulfide) environments.

Chemical Composition (Grade 22): Contains about 1.88-2.62% Chromium and 0.85-1.15% Molybdenum.

Class Distinction: Class 1 has lower strength requirements than Class 2, which has higher tensile (515-690 MPa) and yield (310 MPa min) strengths.

Industries Served:

Oil & Gas

Petrochemical

Power Generation

Chemical Equipment

Supply:

Available as hot-rolled plates, often with heat treatments like normalizing and tempering.

What temperature is ASME SA387 Grade 22 Class 1?
ASME SA387 Grade 22 Class 1 is a high-temperature alloy steel used in applications like pressure vessels, typically performing well in temperatures up to around 600°C (1100°F), with specific heat treatment (like tempering) occurring at temperatures around 675°C (1250°F) to achieve desired properties, though its use extends above these values for creep resistance in refineries and power plants, requiring careful consideration of operating conditions.

What precautions should be taken when welding ASME SA387 Grade 22 Class 1?
When welding ASME SA387 Grade 22 Class 1, key precautions involve managing hydrogen to prevent cracking (using low-hydrogen consumables, pre/post-weld heat treatment), controlling heat input (stringer beads, avoiding high interpass temps), ensuring proper ventilation/PPE, and meticulous post-weld slow cooling or specific PWHT (Post-Weld Heat Treatment) to avoid embrittlement, especially with FCAW processes that introduce more impurities.

What welding rod for ASME SA387 Grade 22 Class 1 ?
For ASME SA387 Grade 22 Class 1 steel, which contains 2.25% Chromium and 1% Molybdenum (2CrMo), you need a matching low-alloy steel welding electrode or filler metal like E225-B4L (for SMAW/stick) or equivalent ER70S-G/ER80S-G/ER90S-G (for GMAW/GTAW), ensuring it provides the necessary strength and creep resistance, often requiring preheat and post-weld heat treatment (PWHT) for proper metallurgy, with E8018-B2 or E9018-B3 being common choices for higher strength.

Equivalents for ASME SA387 Grade 22 Alloy Steel Plates

Specifications for ASME SA387 Grade 22 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)

1Is ASME SA387 Grade 22 Class 1 carbon steel?
No, ASME SA387 Grade 22 Class 1 is a Chromium-Molybdenum Alloy Steel, not plain carbon steel; it's a specialized material with added Chromium (Cr) and Molybdenum (Mo) for high-temperature strength and corrosion resistance in pressure vessels, though it contains carbon like all steels. The "Grade 22" signifies its specific alloy content (around 2.25% Cr, 1% Mo), while "Class 1" refers to its mechanical properties, distinct from standard carbon steels.

2What is the hardness of ASME SA387 Grade 22 Class 1?
For ASME SA387 Grade 22 Class 1, the typical Brinell hardness is 135-179 HB, though specific hardness can vary slightly with heat treatment, with it generally being a softer, lower-strength grade compared to Class 2, focusing on high-temperature service in pressure vessels.

3Is ASME SA387 Grade 22 Class 1 high speed steel?

No, ASME SA387 Grade 22 Class 1 is not high-speed steel (HSS); it's a chromium-molybdenum (Cr-Mo) alloy pressure vessel steel used for high-temperature applications, offering excellent oxidation resistance, unlike HSS, which is known for hardness at extreme temperatures and used for cutting tools. SA387 Grade 22 Cl 1 provides good strength and corrosion resistance for boilers and pressure vessels, with specific chromium and molybdenum content.

4What is the P number of ASME SA387 Grade 22 Class 1?
For ASME SA387 Grade 22 Class 1, the material falls under P-Number 5, which groups together 2.25% Chromium, 1% Molybdenum steels used for elevated temperature service, similar to ASTM A387 Gr. 22, A213 T22, and A335 P22.

5How heavy is ASME SA387 Grade 22 Class 1 ?
ASME SA387 Grade 22 Class 1 refers to an alloy steel plate for pressure vessels, characterized by its chromium-molybdenum content (around 2.25% Cr, 1% Mo), not a specific weight, but rather its mechanical properties like tensile strength (60-85 ksi / 415-585 MPa), yield strength (min 30 ksi / 205 MPa), and elongation (min 18% in 2in/50mm). Its "heaviness" (density) is similar to other steels (around 7.85 g/cm³), but the actual weight depends on the plate's specific dimensions (thickness, width, length).

6What are the typical application fields of ASME SA387 Grade 22 Class 1?
ASME SA387 Grade 22 Class 1 steel is primarily used in high-temperature, high-pressure applications within the oil, gas, and petrochemical industries, for components like pressure vessels, heat exchangers, boilers, piping, and storage tanks, especially where sour gas is present, due to its excellent heat resistance, oxidation resistance, and creep strength.

7What is the composition of ASME SA387 Grade 22 Class 1 ?
ASME SA387 Grade 22 Class 1 is a high-strength chromium-molybdenum alloy steel plate for high-temperature service, primarily containing 2.00-2.50% Chromium (Cr) and 0.90-1.10% Molybdenum (Mo), with controlled amounts of Carbon (C), Manganese (Mn), Silicon (Si), Phosphorus (P), and Sulfur (S) for enhanced strength, oxidation, and corrosion resistance in pressure vessels and boilers.

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Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff