1.1 本规范涵盖用于一般耐腐蚀和工业应用的钛和钛合金铸件。具体如下: 1.1.1 C-2级- UNS R52550。非合金钛， 1.1.2 C-3级- UNS R52551。非合金钛， 1.1.3 C-5级- UNS R56409。钛合金（6%铝，4%钒）， 1.1.4 C-7级- UNS R52700。非合金钛加0.12%至0.25%钯， 1.1.5 C-8级- UNS R52703。非合金钛加0.12%至0.25%钯， 1.1.6 C-9级- UNS R56320。钛合金（3%铝，2.5%钒）， 1.1.7 C-12级- UNS R53400。钛合金（0.3%钼，0.8%镍）， 1.1.8 C-16级- UNS R52402。非合金钛加0。 04%至0.08%钯， 1.1.9 C-17级- UNS R52702。非合金钛加0.04%至0.08%钯，以及 1.1.10 C-38级- UNS R54250。钛合金（4%铝，2.5%钒，1.5%铁）。 1.2 本规范旨在供活性金属铸件的购买者和/或生产商用于定义要求并确保铸件的性能，以用于独特的耐腐蚀应用，即不适用于必须满足所有潜在购买者要求的商品。 1.2.1 建议用户使用本规范作为获得铸件的基础，该铸件将满足委员会成员协商一致确定和修订的最低验收要求。 1.2.2 在采购订单中添加一个或多个补充要求可以满足被认为更严格的用户要求，这些补充要求可能包括但不限于第S1节至第S8节中列出的要求。 1.3 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This specification covers titanium and titanium alloy castings intended for general corrosion resistant and industrial applications. as follows: 1.1.1 Grade C-2— UNS R52550. Unalloyed titanium, 1.1.2 Grade C-3— UNS R52551. Unalloyed titanium, 1.1.3 Grade C-5— UNS R56409. Titanium alloy (6 % aluminum, 4 % vanadium), 1.1.4 Grade C-7— UNS R52700. Unalloyed titanium plus 0.12 to 0.25 % palladium, 1.1.5 Grade C-8— UNS R52703. Unalloyed titanium plus 0.12 to 0.25 % palladium, 1.1.6 Grade C-9— UNS R56320. Titanium alloy (3 % aluminum, 2.5 % vanadium), 1.1.7 Grade C-12— UNS R53400. Titanium alloy (0.3 % molybdenum, 0.8 % nickel), 1.1.8 Grade C-16— UNS R52402. Unalloyed titanium plus 0.04 to 0.08 % palladium, 1.1.9 Grade C-17— UNS R52702. Unalloyed titanium plus 0.04 to 0.08 % palladium, and 1.1.10 Grade C-38— UNS R54250. Titanium alloy (4 % aluminum, 2.5 % vanadium, 1.5 % iron). 1.2 This specification is intended for use of purchasers and/or producers of reactive metal castings for defining the requirements and assuring the properties of castings for unique corrosion-resistant applications, that is, not for commodity items which must meet all potential purchasers’ requirements. 1.2.1 Users are advised to use the specification as a basis for obtaining castings which will meet minimum acceptance requirements established and revised by consensus of the members of the committee. 1.2.2 User requirements considered more stringent may be met by the addition to the purchase order of one or more supplementary requirements, which may include, but are not limited to, those listed in Sections S1 through S8. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 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.