ASTM A556 Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes.

ASTM A556无缝冷拔碳钢给水加热器管标准规范。

ASTM A556 specification covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the form of U-tubes for use in tubular feedwater heaters. Mechanical tests shall be made on specimens including: tension test; flattening test; flaring test; hardness test; and hydrostatic test. Each tube shall be tested after the finish heat treatment following the final cold-drawn pass by passing through a nondestructive tester capable of detecting defects on the entire cross section of the tube.

ASTM A556规范涵盖了用于管式给水加热器的最小壁厚无缝冷拔碳钢管，包括弯曲成U形管。应对试样进行机械试验，包括：拉伸试验；压扁试验；燃烧试验；硬度试验；水压试验。每根管子在最终冷拔道次后的精加工热处理后，应通过能够检测管子整个横截面缺陷的无损检测仪进行测试。

Scope范围

1. 1. This specification covers minimum-wall-thickness, seamless cold-drawn carbon steel tubes including bending into the from of u-tubes, if specified, for use in tubular feedwater heaters.

1.1本规范涵盖了用于管式给水加热器的最小壁厚无缝冷拔碳钢管，包括弯曲成u形管的形式（如有规定）。

1. 2. The tubing sizes covered shall be 5/8 to 1 2/4-in. [15.9 to 31.8-mm] outside diameter, inclusive, with minimum wall thicknesses equal to or greater than 0.045 in. [1.1 mm].

1.2所涵盖的管道尺寸应为外径5/8至1 2/4英寸[15.9至31.8毫米]，包括在内，最小壁厚等于或大于0.045英寸[1.1毫米]。

1. 3. optional supplementary requirements are provided, and hen desired, shall be stated in the order.

1.3提供了可选的补充要求，如有需要，应在订单中说明。

1. 4. The values stared in either inch-pound units or SI units are to be regarded separately as the standard. within the text, the SI units are shown in brackets. The values sated 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. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

1.4以英寸-磅单位或国际单位表示的值应单独视为标准。在文本中，国际单位制显示在括号中。每个系统中记录的值不是完全等效的；因此，每个系统都必须独立使用。结合两个系统的值可能会导致不符合规范。除非订单中指定了本规范的“M”名称，否则应采用英寸-磅单位。

Chemical Components (%) of ASTM A556  ASTM A556的化学成分（%）

All Mechanical Properties Tensile Requirements and Hardness of ASTM A556  ASTM A556的所有机械性能、拉伸要求和硬度

Tolerances:公差：

Tolerances according to specification or according to agreement. Standard tolerances are:

公差符合规范或协议。标准公差为：