ASTM A387 Grade 22 Class 2 Pressure Vessel Steel PLATE
1.Chrome Moly Plate
ASTM A387
ASTM A387 Grade 5 Class 2 | ASTM A387 Grade 9 Class 2 | ASTM A387 Grade 11 Class 2
ASTM A387 Grade 12 Class 2 | ASTM A387 Grade 22 Class 2 | ASTM A387 Grade 91 Class 2
2.A387 Grade 22 Class 2 chrome moly plates for pressure vessels and industrial boilers.A387 Grade 22 Class 2 is a grade of chromium-molybdenum alloy intended primarily for use fabricators in welded boilers and pressure vessels which are designed for use in raised temperature service.
3.With excellent heat resistance and anti corrosive/oxidation qualities, this steel grade is ideal for use in the chemical, oil and gas industry.
4.Equivalents
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-2 | 10 CRMO910 |
5.Specifications
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 22 | 2.25% | 1.00% |
6.Tensile Requirements for Class 2 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) |
7.Chemical Requirements
| Element | Chemical Composition (%) inc. Grade & UNS No. | |
| Grade 22 (UNS: K21590) | ||
| Carbon: | Heat Analysis: | 0.05 – 0.15 |
| Product Analysis: | 0.04 – 0.15 | |
| Manganese: | Heat Analysis: | 0.30 – 0.60 |
| Product Analysis: | 0.25 – 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Heat Analysis: | 2.00 – 2.50 |
| Product Analysis: | 1.88 – 2.62 | |
| Molybdenum: | Heat Analysis: | 0.90 – 1.10 |
| Product Analysis: | 0.85 – 1.15 |
8.Tension Test Requirements:
We shall be tested using a test specimen will confirm to the tensile requirements as outlined in Table 2.
9.Other requirements:
The following requirements and testing procedures (which are not mandatory) are considered suitable for Chrome Molybdenum steel:
Vacuum treatment
Product Analysis
Additional Tension Test
Charpy V-Notch Impact Test
Drop Weight Test
High Temperature Tension Test
Ultrasonic Examination
Magnetic Particle Examination
10.To find out more about our’s services and ASTM A387 Grade 22 Class 2 steel plates which we can supply directly to you from stock or from the mill, Please to contact us.