ASTM A 20 A20M _冶金/矿山/地质_工程科技_专业资料。Designation: A20/ A20M? 13 Standard Speci?cation for General Requirements. ASTM A20/A20M Standard Specification for General Requirements for Steel Plates for Pressure Vessels. standard by ASTM International. ASTM A20/A20M: Standard Specification for General Requirements for Steel Plates for Pressure Vessels.
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A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Current edition approved Oct. Originally approved in Such requirements are provided for use a200 additional testing or additional restrictions are required by the purchaser, and apply only if speci?
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 sstm.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Thus, a range from 60 to 72 in. For plates produced from coil, see also 3. Historic limitations of a plate based upon dimensions thickness, width, and length do not take into account asrm production and processing capabilities.
To qualify any plate to a particular product speci? If the necessary tests required aetm a product speci? This general requirements speci?
ASTM A 20 A20M _百度文库
Permitted variations for other sizes are subject to agreement between the purchaser and the manufacturer or processor, whichever is applicable. Such processing operations include decoiling, leveling, cutting to aa20, testing, inspection, conditioning, heat treatment if applicablepackaging, marking, loading for shipment, and zstm If only one organization is involved in the hot rolling and processing operations, that organization is termed the manufacturer for the hot rolling operation and the processor for the processing operations.
If more than one organization is involved in the hot rolling and processing operations, the organization a220m did the hot rolling is termed the manufacturer and the organization that does one or more processing operations is termed a processor. If heat treatment of plate is to be performed by the fabricator, this is to be stated. Also, if purchaser speci? For Z20 V-notch test, include test specimen orientation, testing temperature, and acceptance criteria.
For drop-weight test, give testing temperature4. Materials and Manufacture 5. In addition, for elements that are listed in Table 1 but are not speci? B In addition for each heat, based upon the heat analysis, the sum of chromium and molybdenum shall not exceed 0. C By agreement between the purchaser and the aatm, the heat analysis limit for vanadium is a0 to be increased to a value not higher than 0.
D By agreement between the purchaser and the supplier, the heat analysis limit for columbium is permitted to be increased to a value not higher that 0. E By agreement between the purchaser and the supplier, the heat analysis limit for titanium is permitted to be increased z20 a value not higher than 0. NOTE 1—Such austenitic grain size numbers may be achieved with lower contents of austenitic grain re? For plates produced from coil, all injurious surface imperfections shall be removed by the processor.
The defects may be removed and replaced with weld metal see 9. This is not considered to be a fault of the steel, but is rather a function of the induced cold work or heat affected zone. Other weld metals may be employed that are compatible with the plate being repaired, if so approved by the purchaser.
Standard Specification for General Requirements for Steel Plates for Pressure Vessels
Such weld metals shall be quali? Two tension test coupons shall be taken from each quenched and tempered a20, as heat treated. If plates are furnished by the manufacturer or processor in accordance with If, during decoiling, the amount of material decoiled is less than that required to reach the next standard test location, a test for quali? For quenched and tempered plates, the two tension test coupons shall be taken from opposite ends of the plate.
If the heattreatment temperatures are not speci? The purchaser shall be informed of the procedure followed in heat treating the specimens. It shall be demonstrated that the cooling rate of the tension test specimen is no faster than, and not substantially slower than, that attained by the method described in The test specimens shall conform to the requirements for either the 11?
The axis of the test specimen shall be located midway between the center of thickness and the top or bottom surface of the plate. Accordingly, the following deductions shall be made from the base elongation requirements in the applicable product speci?
Plate Nominal Thickness Range, in. If the purchaser wishes to have more con? For quenched and tempered plates, one impact test shall be made from each plate, as heat treated. The coupon shall a2m0 heat treated in accordance with the applicable product speci?
The test coupons shall be taken from the material after decoiling and leveling. The impact test coupons shall be subject to the same requirements as those speci? Except as allowed by If the plate thickness is insufficient to obtain full-size specimens, the largest possible subsize specimens shall be used. Accordingly, the following deductions shall be made from the base elongation requirements in 2 in.
The effect is not so pronounced in thicker plates. 2a0 such material, if so stated in the applicable product speci? Unless otherwise provided in the applicable product speci? After selection of the appropriate gage length, the elongation requirement for the alternative gage length shall be deemed not applicable. Therefore, the requirements of The tensile properties will vary within the same plate-as-rolled or piece, be it as-rolled, control-rolled, or heat-treated.
If a test temperature is not speci? The actual test temperature used shall be reported with the test results. The purchaser should, therefore, be aware that testing of one plate-as-rolled does not provide assurance that all locations within a plate-as-rolled will be identical in toughness with the location tested. Normalizing or quenching and tempering the product will reduce the degree of variation.
For plates produced from coil, the test coupon locations shall be the same as for Charpy V-notch tests. The provisions of Such plates shall have adtm quali?
NOTE 2—Any stress relief of test specimens intended to simulate post-weld heat treatment is not included in the above heat treatment. Permissible Variations in Dimensions or Mass One cubic metre of rolled steel is assumed to have a mass of kg, unless otherwise stated in the applicable product speci?
If the material is to be measured by equipment reporting dimensions as decimals, conversion of permitted variations from fractions of an inch to decimals shall be made to three decimal places; using the rounding method prescribed in Practice E Inspection and Testing The manufacturer shall afford the inspector all reasonable facilities to be satis?
All tests except product analysis and inspection shall be made w20 the place of manufacture prior to shipment, unless otherwise speci? Each of the three retest specimens shall equal or exceed the speci? After heat treatment or reheat treatment, a set of three specimens shall be tested and each shall equal or exceed the speci? All mechanical-property tests shall be repeated and the plate surface shall be reexamined for surface defects when it is resubmitted for inspection.
In case of dissatisfaction with the results of the tests, the supplier shall have the option of making claim for a rehearing within that time. Axtm such cases, the manufacturer or processor shall be noti? The heat number, the plate identi? The year-date of the speci? This exclusion does not apply to those plates with speci? The reports shall state whether the plates only, the test coupons only, or both plates and test coupons were heat treated.
For plates produced from coil, the processor shall furnish the required certi? Notwithstanding the absence of a signature, the organization submitting the report is responsible for the content of the report. Notwithstanding the absence of a signature, the organization submitting the EDI transmission is responsible for the content a20 the report.
Packaging, Marking, and Loading for Shipment Those that are considered suitable for use with a product speci? Other tests may be performed by agreement between the manufacturer or processor and the purchaser. These supplementary requirements shall apply only if speci? Unless otherwise agreed upon with the purchaser, it is the responsibility of the manufacturer to select suitable process procedures.
The specimens for analysis shall be taken adjacent to or from a broken tension test specimen. For tests using specimens taken from such heat treated test coupons, the test results shall meet the requirements of the applicable product speci? Additional Tension Test S4. The results obtained using this second test specimen shall meet the requirements of the applicable product speci?
One shall be taken at the center of the plate thickness and the other immediately beneath the surface. Mandatory conformance of these additional tests with the speci? Aa20m percent shear fracture appearance shall also be recorded if speci? Drop-Weight Test for Plates 0.
The specimens shall represent the plates in the?