ASTM A20 steel specification for general requirements for steel plates for pressure vessels.
ASTM A20 materials are intended to be suitable for fusion welding. When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized.
ASTM A20 material chemical composition:
| Copper,max,% | 0.43 |
| Nickel,max,% | 0.43 |
| Chromium,max,% | 0.34 |
| Molybdenum,max,% | 0.13 |
| Vanadium,max,% | 0.04 |
| Columbium,max,% | 0.03 |
| Titanium,max,% | 0.04 |
If plates are required to be heat treated,the heat treatment shall be performed by the manufacturer,the processor,or the fabricator,unless otherwise specified in the applicable product specification.
If the heat treatment required by the applicable product specification is to be performed by the purchaser or the purchaser’s agent,and the plates are to be supplied by the manufacturer or processor in a condition other than that required by the applicable product specification,the order shall so state.
If plates are ordered without the heat treatment required by the applicable product specification,heat treatment of the plates to conform to the requirements of the applicable product specification shall be the responsibility of the purchaser.
If heat treatment is to be performed,the plates shall be heat treated as specified in the applicable specification,the purchaser may specify the heat treatment to be used,provided it is not in conflict with the requirements of the applicable product specification.
If normalizing is to be performed by the fabricator,the plates shall be either normalized or heated uniformly for hot forming,provided that the temperature to which the plates are heated for hot forming does not significantly exceed the normalizing temperature.
If no heat treatment is required,the manufacturer or processor shall have the option of heat treating the plates by normalizing,stress relieving,or normalizing and then stress relieving to meet the requirements of the applicable product specification.
If approved by the purchaser,cooling rates faster than those obtained by cooling in air are permissible to achieve specified mechanical properties,provided that the plates are subsequently tempered in the temperature range from 1100 to 1300 oF[595 to705 oC].
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