ASTM A423 specification covers standards for minimum-wall-thickness, seamless, and electric-resistance welded low-alloy steel tubes to be used for pressure containing parts, that is economizers, and for other corrosion resistant applications. Steel tubes shall either be processed to hot or cold finish. All tubes shall be normalized or given such heat treatment as may be necessary to conform to the requirements of this specification. Chemical composition shall adhere to specified carbon, manganese, phosphorus, sulfur, silicon, copper, chromium, nickel, and molybdenum contents. Tension, flattening, flaring, flange, hardness, reverse flattening, and hydrostatic tests shall be performed. Tubes when inserted in the boiler shall stand expanding and bending without showing cracks or flaws. Tubes shall also conform to tensile strength, yield strength, hardness, and elongation requirements.

ASTM A423规范涵盖了用于承压部件（即省煤器）和其他耐腐蚀应用的最小壁厚、无缝和电阻焊接低合金钢管的标准。钢管应进行热处理或冷处理。所有管子应正火或进行必要的热处理，以符合本规范的要求。化学成分应符合规定的碳、锰、磷、硫、硅、铜、铬、镍和钼含量。应进行拉伸、压扁、扩口、法兰、硬度、反向压扁和静水压试验。插入锅炉的管子应能承受膨胀和弯曲，而不会出现裂纹或缺陷。管子还应符合抗拉强度、屈服强度、硬度和伸长率要求。

Scope范围

1.1 This specification2 covers minimum-wall-thickness, low-alloy steel tubes for pressure containing parts such as economizers or other applications where corrosion resistance is important.

1.2 The tubing sizes and thicknesses usually furnished to this specification are 1/2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm] inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

1.3 Mechanical property requirements do not apply to tubing smaller than 1/4 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.

1.4 This specification covers three grades, two types, and two manufacture finishes:

1.4.1 Grades 1, 2, and 3 are identified in Table 1 (Chemical Requirements), and Table 3 (Tensile Requirements),

1.4.2 Type (seamless or electric-resistance welded),

1.4.3 Manufacture (hot finished or cold finished).

1.5 Optional supplementary requirements S1 and S2 are provided and, when desired, shall be so stated in the order.

1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

1.7 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.

1.1本规范2涵盖了用于承压部件（如省煤器或其他耐腐蚀性很重要的应用）的最小壁厚低合金钢管。

1.2本规范中通常提供的管材尺寸和厚度为外径1/2至5英寸[12.7至127毫米]，最小壁厚0.035至0.500英寸[0.9至12.7毫米]。可以提供具有其他尺寸的管子，前提是这些管子符合本规范的所有其他要求。

1.3机械性能要求不适用于小于1/4英寸的油管。内径为[3.2毫米]或厚度为0.015英寸[0.4毫米]。

1.4本规范涵盖三个等级、两种类型和两种制造饰面：

1.4.1表1（化学要求）和表3（拉伸要求）中确定了1、2和3级，

1.4.2类型（无缝或电阻焊接），

1.4.3制造（热加工或冷加工）。

1.5提供了可选的补充要求S1和S2，如有需要，应在订单中注明。

1.6以国际单位制或英寸-磅单位表示的值应单独视为标准值。在文本中，国际单位制显示在括号中。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。将两个系统的值结合起来可能会导致不符合标准。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。

1.7本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

Chemistry Composition化学成分

Mechanical Properties机械性能

Outside Diameter & Tolerance外径和公差

Parameter参数

Wall thickness & Tolerance壁厚和公差

Length: 6050mm; 6096mm; 7315mm; 11800mm; 12000mm; and so on.
Max developed length: 30 meters, also U bending can be offered.

长度：6050mm；6096mm；7315mm；11800毫米；12000mm；等等。

最大展开长度：30米，也可提供U形弯曲。

Popular Dimensions尺寸大小

Testings测试

Mechanical Tests Required

Tension Test—One tension test will be made on a specimen for lots of not more than 50 tubes.
Flattening Test—One flattening test will be made on specimens from each end ofone finished tube, not the one used for the flaring or flanging test, from each lot .
Flange Test (ASTM A423 Grade 1 Welded Steel Tubes)—One flange test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.
Hardness Test—Brinell or Rockwell hardness tests will be made on specimens from two tubes from each lot
Reverse Flattening Test—For welded tubes, one reverse flattening test shall be made on a specimen from each 1500 ft [460 m] of finished tubing.
Hydrostatic or Nondestructive Electric Test—Each tube will be subjected to the hydrostatic test.

所需的机械测试

张力测试——将对不超过50根管子的试样进行一次张力测试。

压扁试验——将对每批成品管两端的试样进行一次压扁试验，而不是用于扩口或翻边试验的试样。

法兰试验（ASTM A423 1级焊接钢管）——应对每批成品管的每一端进行一次法兰试验，而不是用于压扁试验的试样。

硬度试验——对每批两根管子的试样进行布氏或洛氏硬度试验

反向压扁试验——对于焊接管，应在每1500英尺[460米]成品管的试样上进行一次反向压扁试验。

静水压或无损电试验——每根管子都将接受静水压试验。

General Requirements一般要求

All tubes shall be supplied as per applicable ASTM B338 /B338M, ASTM A450/A450M Specification
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you

所有管子应按照适用的ASTM B338/B338M、ASTM A450/A450M规范供应

将颁发工厂测试证书

我们可以根据您的需求提供3.2认证

Product Marking产品标记

In addition to the marking prescribed in Specification A450/A450M, the marking shall include whether hot finished or cold finished, and whether seamless or welded.

除规范A450/A450M中规定的标记外，标记还应包括热加工或冷加工，以及无缝或焊接。