CASE

2153-1CASES OF ASME BOILER AND PRESSURE VESSEL CODE

Approval Date: August 4, 2004

The ASME Boiler and Pressure Vessel Standards Committee took action toeliminate Code Case expiration dates effective March 11, 2005. This means thatall Code Cases listed in this Supplement and beyond will remain available for

use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.

Case 2153-1Use of Semi-Permanent Mold Cast Aluminum AlloyA356.0 for the Manufacture of Heating Boilers UnderPart HCSection IV

Inquiry: May aluminum alloy A356.0 semi-permanentmold castings in the T61 temper meeting the chemicalcomposition and mechanical properties given in Tables 1and 2 and other requirements of SB-108 be used in SectionIV, Part HC, construction of heating boilers for tempera-tures up to 250F?

Reply: It is the opinion of the Committee that aluminumalloy A356.0 semi-permanent mold castings in the T61temper meeting the chemical composition and mechanicalproperties in Tables 1 and 2 and other requirements ofSB-108 may be used in Section IV, Part HC, constructionof heating boilers for temperatures up to 250F under thefollowing conditions:

(a) Design temperature shall not exceed 250F.(b) No welding is permitted except for repairs by the

casting producer, as allowed in para. 17 of SB-108.(c) In lieu of Section IV, HC-200 through HC-213, all

applicable requirements of SB-108 and Tables 1 and 2 ofthis Case shall apply. The footnotes applicable to Tables1 and 2 of SB-108 apply to Tables 1 and 2 of this Case.

The Committees function is to establish rules of safety, relating only to pressure integrity, governing the construction of boilers, pressure vessels, transport tanks andnuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to interpret these rules when questions ariseregarding their intent. This Code does not address other safety issues relating to the construction of boilers, pressure vessels, transport tanks and nuclear components,and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, laws, regulations orother relevant documents.

1 (2153-1)

TABLE 1CHEMICAL REQUIREMENTS

Element Composition, %

Silicon 6.57.5Iron 0.20Copper 0.20Manganese 0.010Magnesium 0.250.45Nickel . . .Zinc 0.10Titanium 0.20

TABLE 2MECHANICAL PROPERTIES

Tensile strength, min., ksi 37.0Yield strength, min. ksi 26.0Elongation in 2 in., min. % 5.0Typical Brinell Hardness, 500 kgf 70100

(d) All other applicable parts of Section IV shall applyexcept HC-401 and HC-402.

(e) Proof testing to establish design pressures is requiredand shall comply with HG-501 and HG-502.3. In the equa-tion in HG-502.3, the specified minimum tensile strengthat room temperature shall be 37 000 psi.

(f) This Case number shall be shown on the H-5 DataReport.

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