What is the ASTM A387 Grade 22 Class 1 standard?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel plate standard for welded boilers and pressure vessels in high-temperature service, featuring ~2.25% Cr and ~1% Mo for heat resistance, with Class 1 indicating standard pressure vessel properties, meaning it offers good strength and formability but requires less stringent low-temperature impact toughness than Class 2.
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel plate designed for welded boilers and high-temperature pressure vessels, featuring about 2.25% Chromium and 1% Molybdenum for excellent high-temp strength and oxidation resistance. In this composition, chromium stands out as a pivotal element that assumes significance in the production of the alloy, while the molybdenum provides enhanced creep strength at elevated temperatures.
The application scope of a particular alloy grade, such as ALLOY STEEL SA 387 GR. 22 CL. 1 / 2 plates, is delineated by its composition and characteristics. In the case of Grade 22, "Class 1" indicates a lower tensile strength range compared to Class 2. Due to its specific chemical balance, it is widely used in the oil, gas, and petrochemical industries for equipment like heat exchangers and reactors, offering good performance in corrosive environments.
Key Characteristics:
Composition: ~2.25% Chromium, ~1.00% Molybdenum, with other elements like Carbon, Manganese, etc..
Purpose: Intended for elevated temperature service in pressure vessels and boilers.
Properties: Offers good corrosion, oxidation, and stress corrosion cracking resistance.
Class 1 vs. Class 2: Grade 22 comes in two tensile strength classes; Class 1 has a lower strength range than Class 2.
Applications: Oil & gas, petrochemical, power generation, and chemical processing.
Heat Treatment: Requires thermal treatment (annealing, normalizing, or quenching/tempering).
In essence:
It's a robust, high-temperature steel plate with specific alloying elements that give it durability for demanding industrial uses where heat and corrosion are factors, with the Class 1 designation specifying its mechanical strength level.
What is the hardness of ASTM A387 Grade 22 Class 1 ?
ASTM A387 Grade 22 Class 1 steel typically has a Brinell hardness of around 190 HBW, though specific hardness can vary slightly with heat treatment, but it's usually within a range corresponding to its tensile properties, with common values around 415-585 MPa tensile strength and minimum yield strength around 205-240 MPa.
What is ASTM A387 Grade 22 Class 1 equivalent to?
ASTM A387 Grade 22 Class 1 is equivalent to ASME SA387 Grade 22 Class 1, and internationally to standards like EN 10 CRMO 9-10, DIN 10CrMo9-10, and BS 622-515B, all specifying a 2.25% Chromium, 1% Molybdenum alloy steel for high-temperature pressure vessels, with Class 1 indicating lower tensile strength than Class 2.
What precautions should be taken when welding ASTM A387 Grade 22 Class 1 ?
When welding ASTM A387 Grade 22 Class 1, key precautions involve thorough surface cleaning, implementing preheating and post-weld heat treatment (PWHT) to prevent cracking (especially stress relief at ~690°C), using low-hydrogen consumables, ensuring proper ventilation, and wearing full Personal Protective Equipment (PPE) like a helmet, gloves, and flame-retardant clothing to manage risks from fumes, radiation, and spatter. This low-alloy Cr-Mo steel is prone to cold cracking due to its hardenability, necessitating careful control of heat input and residual stress.
ASTM A387 GR 22 CLASS 1 Plate Specification :
| Standard | ASTM A387 / ASME SA 387 |
|---|---|
| Width | 1000mm-4500mm |
| Thickness | 5mm-150mm |
| Length | 3000mm-18000mm |
| Impact tested | -52° C |
| Material | Alloy Steel |
| Process of Manufacturing | Hot-Rolled (HR) |
Equivalents for ASTM A387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-1 | 10 CRMO910 |
Specifications for ASTM A387 Grade 22 Alloy Steel Plates
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 22 | 2.25% | 1.00% |
Dimension Range
|
Grade |
Product type |
Thickness |
Width |
Length |
|---|---|---|---|---|
|
Grade 22 |
Plate |
4.70 - 91.4 |
1500 - 3350 |
1900 - 15000 |
Alloy Steel ASTM A387 GR 22 CL. 1 Plates Chemical Composition :
| Grade | C | Mn | P | S | Si | Cr | Mo |
| Alloy Steel Gr.22 | 0.04 – 0.15 | 0.25 – 0.66 | 0.035 | 0.035 | 0.5 max | 1.88 – 2.62 | 0.85 – 1.15 |
Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 22 |
| A387 Grade 22 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ... | |
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
1. What is ASTM A387 Grade 22 Class 1 material ?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel plate designed for welded boilers and high-temperature pressure vessels, featuring around 2.25% Chromium and 1% Molybdenum, offering good strength and corrosion resistance, with Class 1 indicating a specific, lower tensile strength range compared to Class 2.
2. What temperature is ASTM A387 Grade 22 Class 1 ?
ASTM A387 Grade 22 Class 1 is designed for high-temperature service, with its minimum tempering temperature being 1250°F (675°C), and it performs well in applications up to around 600°C (1112°F), offering excellent strength and corrosion resistance in elevated temperature environments like boilers and pressure vessels.
3. What are the typical application fields of ASTM A387 Grade 22 Class 1 ?
ASTM A387 Grade 22 Class 1 is a chrome-moly alloy steel primarily used for high-temperature pressure vessels, boilers, and heat exchangers, serving the oil, gas, petrochemical, and power generation industries due to its excellent resistance to heat, oxidation, and corrosion, especially in demanding environments like refineries. It's ideal for components such as flanges, ducting, and pressure vessels operating under elevated temperatures, with a working range up to about 600°C (1100°F).
4. What is the composition of ASTM A387 Grade 22 Class 1 ?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel for pressure vessels, primarily containing around 2.25% Chromium (Cr) and 1.00% Molybdenum (Mo), with specified limits for Carbon (C), Manganese (Mn), Phosphorus (P), Sulfur (S), and Silicon (Si) to ensure high-temperature strength and corrosion resistance, particularly suitable for welded boiler and pressure vessel service.
5. What is ASTM A387 Grade 22 Class 1 high speed steel?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel plate designed for high-temperature pressure vessels and boilers, offering good corrosion resistance, with specific mechanical properties like lower yield/tensile strength than Class 2, and requiring normalization
6. Is ASTM A387 Grade 22 Class 1 carbon steel?
No, ASTM A387 Grade 22 Class 1 is not plain carbon steel; it's a chromium-molybdenum (Cr-Mo) alloy steel, specifically designed as a pressure vessel plate for elevated temperature service, offering better heat resistance and corrosion properties than standard carbon steels due to its ~2.25% Chromium and ~1.00% Molybdenum content. While it's related to carbon steel (as it's a steel), the added alloying elements classify it as an alloy steel for high-temperature, high-pressure applications in industries like oil, gas, and petrochemicals, unlike basic carbon steels
7. What welding rod for ASTM A387 Grade 22 Class 1?
For welding ASTM A387 Grade 22 Class 1 (2.25Cr-1Mo steel), you typically use matching low-alloy steel consumables like E/ER70S-2 for GTAW/SMAW or E7018 for SMAW, often with preheat and post-weld heat treatment (PWHT) to prevent cracking, but for demanding applications, nickel-based electrodes (like ENiCrMo-3/ERNiCrMo-3) are used to avoid carbide formation and carbon migration, Key considerations are the 2.25% Cr and 1% Mo content, requiring filler metals that match or exceed these elements for service at elevated temperatures, often requiring PWHT, and potentially nickel-based fillers for dissimilar joints or to mitigate issues like temper embrittlement,
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