ASTM A789 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

ASTM A789一般用途无缝和焊接铁素体/奥氏体不锈钢管标准规范

ASTM A789 A789M Covers Grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

ASTM A789 A789M涵盖了标称壁厚等级的不锈钢管，用于需要一般耐腐蚀性的服务，特别强调耐应力腐蚀开裂。如果在高温下长时间使用，这些钢容易脆化。

This specification covers standard requirements for grades of nominal wall thickness, stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. Heat and product analyses shall be performed wherein the steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, nitrogen, copper, and others. All tubes shall be furnished in the heat-treated condition in accordance with the specified temperature and quench conditions. When the final heat treatment is in a continuous furnace, or when heat treated condition is obtained directly by quenching after hot forming, the number of tubes of the same size and from the same heat in a lot shall be determined from the prescribed sizes of the tubes. The material shall conform to the prescribed tensile and hardness properties. Mechanical tests such as tension test, flaring test (for seamless tubes), flange test (for welded tubes), hardness test, and reverse flattening test shall be performed on the steel tubing. Each tube shall also be subjected to the nondestructive electric test or the hydrostatic test.

本规范涵盖了标称壁厚等级的标准要求，适用于需要一般耐腐蚀性的不锈钢管，特别强调耐应力腐蚀开裂性。如果在高温下长时间使用，这些钢容易脆化。应进行热和产品分析，其中钢应符合碳、锰、磷、硫、硅、镍、铬、钼、氮、铜等所需的化学成分。所有管子应按照规定的温度和淬火条件进行热处理。当最终热处理在连续炉中进行时，或者当热处理条件是在热成型后直接通过淬火获得时，同一尺寸和同一炉次的管子数量应根据规定的管子尺寸确定。材料应符合规定的拉伸和硬度性能。钢管应进行拉伸试验、扩口试验（无缝管）、法兰试验（焊接管）、硬度试验和反向压扁试验等机械试验。每根管子还应进行无损电气试验或水压试验。

Scope范围

1.1 This specification2 covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.

1.1本规范2涵盖了需要一般耐腐蚀性服务的不锈钢管的平均壁厚等级，或者如果订单上有规定，则涵盖了最小壁厚，特别强调了抗应力腐蚀开裂的能力。如果在高温下长时间使用，这些钢容易脆化。

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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. Within the text, the SI units are shown in brackets. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

1.2以国际单位制或英寸-磅单位表示的值应单独视为标准值。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。在文本中，国际单位制显示在括号中。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。

1.3 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.

1.3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。

Referenced Documents:参考文件：

ASTM Referenced Standards. ASTM参考标准。

A450 A450M Specification for General requirements for carbon, Ferritic Alloy, and Austenitic alloy steel tubes.

A450 A450M碳、铁素体合金和奥氏体合金钢管的一般要求规范。

A480 A480M Specification for general requirements for flat-rolled stainless and heat-resisting steel plate, sheet, and strip.

A480 A480M平轧不锈钢和耐热钢板、薄板和带材的一般要求规范。

A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys.

A941与钢、不锈钢、相关合金和铁合金有关的术语。

E527 Practice for numbering metals and alloys (UNS).

E527金属和合金编号规程（UNS）。

Chemical Composition化学成分

Heat Treatment Requirements热处理要求

Tensile Requirements

Flange Test (for welded tubes)法兰试验（适用于焊接管）

One test shall be made on specimens from one end of one tube from each lot of finished tubes.

应从每批成品管的一端对试样进行一次测试。

Flaring Test扩口试验

One test shall be made on specimens from one end of one tube from each lot of finished tubes. The minimum expansion of the inside diameter shall be 10%.

应从每批成品管的一端对试样进行一次测试。内径的最小膨胀应为10%。

Reverse Flattening Test反向压扁试验

For welded tubes, one reverse flattening test shall be made on a specimen from each 1500Ft or 450m of finished tubing.

对于焊接管，应在每1500Ft或450m成品管的试样上进行一次反向压扁试验。

Hydrostatic or Nondestructive Testing静水压或无损检测

Each pipe shall be subjected to the nondestructive electric test or the hydrostatic test, the type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

除非采购订单中另有规定，否则每根管道都应进行无损电气试验或静水压试验，所使用的试验类型应由制造商选择。

The hydrostatic test shall be in accordance with specification A 450/A 450M, except that in the calculation of the hydrostatic test pressure 64000(441.2) shall be substituted for 32000(220.6).

静水压试验应符合规范A 450/A 450M，但在计算静水压试验压力时，应将32000（220.6）替换为64000（441.2）。

Markings标记

Marking prescribed in specification A450/A 450M, The marking shall indicate whether the tubing is seamless or welded.

规范A450/A 450M中规定的标记，标记应表明管子是无缝的还是焊接的。

Note:注：

• Mill test certificates will be issued according to EN10204.3.·
• 工厂测试证书将根据EN10204.3颁发。
• All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.·
• 所有管子应按照适用的ASTM A789/A789M规范供应。