ASTM A387 Grade 5 Class 2 is a quenched and tempered chromium-molybdenum alloy steel plate compliant with ASTM A387/A387M standard, featuring a tensile strength of 515-690 MPa, minimum yield strength of 310 MPa and good resistance to high temperature, high pressure and hydrogen embrittlement. It is mainly used to fabricate pressure vessels, boilers, heat exchangers and piping systems for oil and gas, petrochemical and power generation industries, with equivalent materials like EN 10028-2 10CrMo5-5 and JIS G 4109 SCMV1.
Chemical Requirements for ASTM A387 Grade 5 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| A 387 Grade 5 | ||
| 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: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.030 |
| Product Analysis: | 0.030 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.55 max | |
| Chromium: | Heat Analysis: | 4.00 - 6.00 |
| Product Analysis: | 3.90 - 6.10 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.65 |
| Product Analysis: | 0.40 - 0.70 |
applications
Oil & Gas Industry
Used for fabricating high-pressure sour service equipment, catalytic cracking units, offshore gas processing tanks, and refinery towers that endure hydrogen sulfide corrosion, cyclic thermal loads, and extreme pressure fluctuations.
Petrochemical Industry
Applied to manufacture high-pressure reactors, hydrogenation units, separators, and heat exchangers handling aggressive chemical media during petroleum refining and chemical synthesis processes.
Power Generation Industry
Serves as the core material for critical components in ultra-supercritical thermal power plants, including boilers, heat recovery steam generators (HRSG), and associated high-temperature piping systems.
Fertilizer Industry
Utilized for constructing high-pressure ammonia and urea synthesis towers that operate under harsh reaction conditions involving high temperature, high pressure, and corrosive ammonia-containing environments.
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What are the key characteristics of ASTM A387 Grade 5 Class 2?
This steel grade boasts excellent high-temperature creep resistance, strong corrosion resistance from its chromium-molybdenum alloy composition, and good weldability with low crack sensitivity, allowing weld joints to match base metal properties after proper post-weld heat treatment.
What are the typical applications of ASTM A387 Grade 5 Class 2?
It is widely used in harsh industrial environments, including high-pressure sour service equipment and catalytic cracking units in oil and gas, high-pressure reactors in petrochemicals, critical components of ultra-supercritical power plant boilers, and high-pressure ammonia synthesis towers in fertilizer production.