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

ASTM A556無縫冷拔碳鋼給水加熱器管標準規範。

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規範涵蓋了用於管式給水加熱器的最小壁厚無縫冷拔碳鋼管，包括彎曲成U形管。應對試樣進行機械試驗，包括：拉伸試驗；壓扁試驗；燃燒試驗；硬度試驗；水壓試驗。每根管子在最終冷拔道次後的精加工熱處理後，應通過能夠檢測管子整個橫截麵缺陷的無損檢測儀進行測試。

Scope範圍

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本規範涵蓋了用於管式給水加熱器的最小壁厚無縫冷拔碳鋼管，包括彎曲成u形管的形式（如有規定）。

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所涵蓋的管道尺寸應為外徑5/8至1 2/4英寸[15.9至31.8毫米]，包括在內，最小壁厚等於或大於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提供了可選的補充要求，如有需要，應在訂單中說明。

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-磅單位或國際單位表示的值應單獨視為標準。在文本中，國際單位製顯示在括號中。每個係統中記錄的值不是完全等效的；因此，每個係統都必須獨立使用。結合兩個係統的值可能會導致不符合規範。除非訂單中指定了本規範的“M”名稱，否則應采用英寸-磅單位。

Chemical Components (%) of ASTM A556  ASTM A556的化學成分（%）

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

Tolerances:公差：

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

公差符合規範或協議。標準公差為：