ASTM A387 Grade 12 Class 2 Pressure Vessel Steel PLATE
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.We are stockists and suppliers of A387 Grade 12 Class 2 chrome molybdenum steel plates.A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics.
3.The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
4.Equivalents
| BS | EN | ASTM/ASME | DIN |
| 620 B | 13 CRMO 45 | A387-12-2 | 13 CRMO 44 |
5.Specifications
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 12 | 1.00% | 0.50% |
6.Tensile Requirements for Class 2 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 % | ––– |
7.Chemical Requirements
| Element | Chemical Composition (%) inc. Grade & UNS No. | |
| Grade 12 (UNS: K11757) | ||
| 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 |
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 12 Class 2 steel plates which we can supply directly to you from stock or from the mill, Please contact us.