SA-225/SA-225M- ASME 美标
SA225GrC SA225GrD SA-225/SA-225M Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Vanadium-Nickel - covering manganese-vanadium-nickel alloy steel plates for welded layered pressure vessels with different grades and strength levels.
(Identical with ASTM Specification A225/A225M-17.)
1.1 This specification covers manganese-vanadium-nickel alloy steel plates intended primarily for welded layered pressure vessels.
1.2 Plates under this specification are available in two grades having different strength levels as follows:
| Grade | Tensile Strength, ksi [MPa] |
|---|---|
| C | 105-135 [725-930] |
| D (3 in. [75 mm] and under) | 80-105 [550-725] |
| D (Over 3 in. [75 mm]) | 75-100 [515-690] |
1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements.
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3.1 Material supplied to this material specification shall conform to Specification A20/A20M. These requirements outline the testing and retesting methods and procedures, permitted variations in dimensions, and mass, quality and repair of defects, marking, loading, and ordering information.
3.2 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional control, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary requirements in this specification and to the detailed requirements in Specification A20/A20M.
3.3 Coils are excluded from qualification to this specification until they are processed into finished plates. Plates produced from coil means plates that have been cut to individual lengths from coil. The processor directly controls, or is responsible for, the operations involved in the processing of coils into finished plates. Such operations include decoiling, leveling, cutting to length, testing, inspection, conditioning, heat treatment (if applicable), packaging, marking, loading for shipment, and certification.
NOTE 1—For plates produced from coil and furnished without heat treatment or with stress relieving only, three test results are reported for each qualifying coil. Additional requirements regarding plates from coil are described in Specification A20/A20M.
3.4 If the requirements of this specification are in conflict with the requirements of Specification A20/A20M, the requirements of this specification shall prevail.
4.1 Steelmaking Practice—The steel shall be killed and shall conform to the fine austenitic grain size requirement of Specification A20/A20M.
5.1 Grade D plates of all thicknesses and Grade C plates of thicknesses over 2 in. [50 mm] shall be normalized.
5.2 Grade C plates 2 in. [50 mm] and under in thickness are usually supplied in the as-rolled condition. The plates may be ordered normalized or stress-relieved, or both.
6.1 The steel shall conform to the chemical requirements given in Table 1, unless otherwise modified in accordance with Supplementary Requirement S17, Vacuum Carbon-Deoxidized Steel, in Specification A20/A20M.
| Elements | Composition, % | |
|---|---|---|
| Grade C | Grade D | |
| Carbon, maxA | 0.25 | 0.20 |
| Manganese, max: | ||
| Heat analysis | 1.60 | 1.70 |
| Product analysis | 1.72 | 1.84 |
| Phosphorus, maxA | 0.025 | 0.025 |
| Sulfur, maxA | 0.025 | 0.025 |
| Silicon: | ||
| Heat analysis | 0.15-0.40 | 0.10-0.50 |
| Product analysis | 0.13-0.45 | 0.08-0.56 |
| Vanadium: | ||
| Heat analysis | 0.13-0.18 | 0.10-0.18 |
| Product analysis | 0.11-0.20 | 0.08-0.20 |
| Nickel: | ||
| Heat analysis | 0.40-0.70 | 0.40-0.70 |
| Product analysis | 0.37-0.73 | 0.37-0.73 |
A Applies to both heat and product analyses.
7.1 Tension Test—The plates, as represented by the tension test specimens, shall conform to the requirements given in Table 2.
| Grade C | Grade D | |||
|---|---|---|---|---|
| ksi [MPa] | ksi [MPa] | ksi [MPa] | ksi [MPa] | |
| Tensile strength: | ||||
| All thicknesses | 105-135 | [725-930] | ||
| 3 in. [75 mm] and under | 80-105 | [550-725] | ||
| Over 3 in. [75 mm] | 75-100 | [515-690] | ||
| Yield strength, min:A | ||||
| All thicknesses | 70 | [485] | ||
| 3 in. [75 mm] and under | 60 | [415] | ||
| Over 3 in. [75 mm] | 55 | [380] | ||
| Elongation in 8 in. [200 mm], min, %B | 20 | 19 | ||
| Elongation in 2 in. [50 mm], min, %B | 17 | |||
A Determined by either the 0.2% offset method or the 0.5% extension-under-load method.
B See Specification A20/A20M for elongation adjustment.
7.2 For plates with a nominal thickness of ¾ in. [20 mm] and under, the ½-in. [40-mm] wide rectangular specimen may be used and the elongation determined in a 2-in. [50-mm] gage length that includes the fracture and that shows the greatest elongation.
8.1 alloy steel plates; manganese-vanadium-nickel steel plate; plate for pressure vessels; pressure containing parts
Supplementary requirements shall not apply unless specified in the purchase order.
A list of standardized supplementary requirements for use at the option of the purchaser is included in Specification A20/A20M. Those that are considered suitable for use with this specification are listed below by title.
Source: This specification interpretation is compiled from the Wugang Steel Spot standards library (sister site, reposted with permission). Copyright of the original standards belongs to each standards organization. For official use please refer to the published standard text.
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