ASTM A387 Grade 11 Class 2 / ASME SA387 Grade 11 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
As a quality chrome moly steel, A387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and chemical industry, where liquids and gases are often stored at high temperature (see pressure vessels).
The higher levels of chromium also provide excellent corrosion and oxidation resistance.
ASTM / ASME Specification:
- ASTM A387 Grade 11 Class 2
- ASME SA387 Grade 11 Class 2
Equivalents
| BS | EN | ASTM/ASME | DIN |
| 621 B | ––– | A387-11-2 | ––– |
Specifications
Chromium & Molybdenum content (according to the ASTM specification):
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 11 | 1.25% | 0.50% |
Tensile Requirements for Class 2 Plates
| Designation: | Requirement: | Grade 11 |
| A387 Grade 11 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 43 [310] | |
| Elongation in 8 in. [200mm], min % | 18 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– | |
Chemical Requirements
| Element | Chemical Composition (%) inc. Grade y UNS No. | |
| Grade 11 (UNS: K11789) | ||
| 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: | 0.50 - 0.80 | |
| Product Analysis: | 0.44 - 0.86 | |
| Chromium: | ||
| Heat Analysis: | 1.00 - 1.50 | |
| Product Analysis: | 0.94 - 1.56 | |
| Molybdenum: | ||
| Heat Analysis: | 0.45 - 0.65 | |
| Product Analysis: | 0.45 - 0.70 | |
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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