ASTM A387 Grade12 Class 1
ASTM A387 grade 12 class 1 is ASTM A387 grade 12 steel in the annealed condition. The graph bars on the material properties cards below compare ASTM A387 grade 12 class 1 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 Gr 12 CL 1 is a chromium molybdenum alloy steel plate intended primarily for welded boiler and pressure vessels designed of elevated temperature service. The Cr content 1.00% and the Mo content 0.5%.
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ASME SA387 Grade 12 Class 1 is a chromium-molybdenum alloy steel plate designed for use in pressurevessels and boilers working in elevated temperatures. This material combines the corrosion resistance of chromiumwith the high strength and heat resistance of molybdenum. It belongs to the family of alloy steels specified under theASME SA387 and ASTM A387 standards.
Key Features of ASME SA387 Grade 12 Alloy Steel Plates
. High-Temperature Resistance: Can withstand temperatures up to 6o0C or more without losing strength.
.Corrosion Resistance: Chromium content offers excellent resistance to oxidation and corrosion.
. Toughness and Ductility: Provides durability and resistance to cracking under stress.
. Weldability: These plates can be welded using standard methods without preheating in most cases.
Versatility: Suitable for pressure vessels, structural applications, and equipment operating under high thermal
conditions.
These plates are commonly used in industries such as:
Petrochemical
* Power generation
Oil&gas
.Chemical processing
Heat exchangers and reactors
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 620 B | 13 CRMO 45 | A387-12-1 | 13 CRMO 44 |
Chromium & Molybdenum content
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 12 | 1.00% | 0.50% |
Tensile Requirements for ASTM A387 Grade 12 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 12 |
| A387 Grade 12 | Tensile strength, ksi [MPA] | 65 to 85 [450 to 585] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 40 [275] | |
| Elongation in 8 in. [200mm], min % | 19 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
Chemical Requirements for ASTM A387 Grade 12 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| ASTM A387 Grade 12 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Heat Analysis: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.15 - 0.40 |
| Product Analysis: | 0.13 - 0.45 | |
| Chromium: | Heat Analysis: | 0.80 - 1.15 |
| Product Analysis: | 0.74 - 1.21 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.60 |
| Product Analysis: | 0.40 - 0.65 |
1 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, with common international equivalents being EN 10 CrMo9-10, DIN 10 CrMo9-10, and BS 622-515B, all referring to a chromium-molybdenum alloy steel for high-temperature pressure vessels, differing from Class 2 primarily in mechanical strength properties.
2 What temperature is ASTM A387 Grade 22 Class 1 equivalent to?
ASTM A387 Grade 22 Class 1 is a chromium-molybdenum alloy steel for elevated temperatures, often used up to around 600°C (1112°F) in pressure vessels, with a minimum tempering temperature requirement of 1250°F (675°C) for heat treatment, but its specific application temperature range depends on service conditions, generally performing well from moderate to high temperatures.
3 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 alloy steel (Cr-Mo alloy) designed for high-temperature pressure vessels, containing specific amounts of chromium (around 2.25%) and molybdenum (around 1%) for enhanced strength, ductility, and corrosion resistance, unlike basic carbon steels which rely mainly on iron and carbon.
4Is ASTM A387 Grade12 Class 1 high speed steel?
No, ASTM A387 Grade 12 Class 1 is not high-speed steel (HSS); it's a chromium-molybdenum alloy steel for pressure vessels and boilers at elevated temperatures, offering good corrosion/oxidation resistance and high-temp strength, while HSS is for cutting tools. The "Grade 12" refers to its composition (around 1% Cr, 0.5% Mo), and "Class 1" indicates specific tensile strength levels, differing from HSS which contains high tungsten/molybdenum for hardness at high heat.
5What is the composition of ASTM A387 Grade12 Class 1?
ASTM A387 Grade 12 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel for elevated temperature pressure vessels, characterized by ~1% Chromium (Cr) and ~0.5% Molybdenum (Mo) content, with standard elements like Carbon (C), Manganese (Mn), Silicon (Si), Phosphorus (P), and Sulfur (S), offering good corrosion resistance and high-temp strength for oil, gas, and refining applications. The 'Class 1' designation refers to specific tensile strength requirements, distinct from Class 2, but the chemical composition remains largely the same between classes for Grade 12.
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