ASTM A387 Grade 91 Class 2 / ASME SA387 Grade 91 Class 2
In this section:chrome moly steel | A387 Grade 11 Class 2 | A387 Grade 12 Class 2 | A387 Grade 22 Class 2
A387 Grade 5 Class 2 | A387 Grade 91 Class 2 | A387 Grade 9 Class 2
A387 Grade 9 Class 2 – chrome–molybdenum plate is an ideal material for welded pressure vessels and boilers used in elevated temperature service. With excellent resistance to high temperature and corrosion, this type of steel is commonly used in the petrochemical, oil, gas and power generation industry.
All plates come with mill test certification and individual stampings. Third party testing can be arranged at the customers request.
ASTM / ASME Specification:
- ASTM A387 Grade 9 Class 2
- ASME SA387 Grade 9 Class 2
Equivalents
| BS | EN | ASTM/ASME | DIN |
| ... | ... | A387-9-2 | ... |
Specifications
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 9 | 9.00% | 1.00% |
Tensile Requirements for Class 2 Plates
| Designation: | Requirement: | Grade 9 |
| A387 Grade 9 | 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 test specimens) 40 (measured on flat test specimen) |
|
Chemical Requirements
| Element | Chemical Composition (%) inc. Grade & UNS No. | |
| Grade 9 (UNS: K90941) | ||
| Carbon: | ||
| Heat Analysis: | 0.15 max | |
| Product Analysis: | 0.15 max | |
| Manganese: | ||
| Heat Analysis: | 0.30 - 0.60 | |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | ||
| Heat Analysis: | 0.030 | |
| Product Analysis: | 0.030 | |
| Sulphur (max): | ||
| Heat Analysis: | 0.030 | |
| Product Analysis: | 0.030 | |
| Silicon: | ||
| Heat Analysis: | 1.00 max | |
| Product Analysis: | 1.05 max | |
| Chromium: | ||
| Heat Analysis: | 8.00 - 10.00 | |
| Product Analysis: | 7.90 - 10.10 | |
| Molybdenum: | ||
| Heat Analysis: | 0.90 - 1.10 | |
| Product Analysis: | 0.85 - 1.15 | |
| Vanadium: | ||
| Heat Analysis: | 0.04 max | |
| Product Analysis: | 0.05 max | |
Tension Test Requirements:
The material shall be tested using a test specimen will confirm to the tensile requirements as outlined in Table 2.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
Steel Product Range:
pressure vessel steel | boiler plate | chrome moly steel | clad plates | structural steel | hic steel
wear resistant steel | stainless steel | heat resistant steel | structural steel sections | pipes/tubulars
hot rolled plate | weather resistant steel
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