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

ASTM A789一般用途無縫和焊接鐵素體/奧氏體不鏽鋼管標準規範

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涵蓋了標稱壁厚等級的不鏽鋼管，用於需要一般耐腐蝕性的服務，特別強調耐應力腐蝕開裂。如果在高溫下長時間使用，這些鋼容易脆化。

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.

本規範涵蓋了標稱壁厚等級的標準要求，適用於需要一般耐腐蝕性的不鏽鋼管，特別強調耐應力腐蝕開裂性。如果在高溫下長時間使用，這些鋼容易脆化。應進行熱和日皮视频APP下载分析，其中鋼應符合碳、錳、磷、硫、矽、鎳、鉻、鉬、氮、銅等所需的化學成分。所有管子應按照規定的溫度和淬火條件進行熱處理。當最終熱處理在連續爐中進行時，或者當熱處理條件是在熱成型後直接通過淬火獲得時，同一尺寸和同一爐次的管子數量應根據規定的管子尺寸確定。材料應符合規定的拉伸和硬度性能。鋼管應進行拉伸試驗、擴口試驗（無縫管）、法蘭試驗（焊接管）、硬度試驗和反向壓扁試驗等機械試驗。每根管子還應進行無損電氣試驗或水壓試驗。

Scope範圍

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本規範2涵蓋了需要一般耐腐蝕性服務的不鏽鋼管的平均壁厚等級，或者如果訂單上有規定，則涵蓋了最小壁厚，特別強調了抗應力腐蝕開裂的能力。如果在高溫下長時間使用，這些鋼容易脆化。

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以國際單位製或英寸-磅單位表示的值應單獨視為標準值。每個係統中所述的值可能不是完全等效的；因此，每個係統都應獨立使用。將兩個係統的值結合起來可能會導致不符合標準。在文本中，國際單位製顯示在括號中。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。

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本國際標準是根據世界貿易組織技術性貿易壁壘委員會發布的《關於製定國際標準、指南和建議的原則的決定》中確立的國際公認的標準化原則製定的。

Referenced Documents:參考文件：

ASTM Referenced Standards. ASTM參考標準。

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

A450 A450M碳、鐵素體合金和奧氏體合金鋼管的一般要求規範。

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

A480 A480M平軋不鏽鋼和耐熱鋼板、薄板和帶材的一般要求規範。

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

A941與鋼、不鏽鋼、相關合金和鐵合金有關的術語。

E527 Practice for numbering metals and alloys (UNS).

E527金屬和合金編號規程（UNS）。

Chemical Composition化學成分

Heat Treatment Requirements熱處理要求

Tensile Requirements

Flange Test (for welded tubes)法蘭試驗（適用於焊接管）

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

應從每批成品管的一端對試樣進行一次測試。

Flaring Test擴口試驗

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%.

應從每批成品管的一端對試樣進行一次測試。內徑的最小膨脹應為10%。

Reverse Flattening Test反向壓扁試驗

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

對於焊接管，應在每1500Ft或450m成品管的試樣上進行一次反向壓扁試驗。

Hydrostatic or Nondestructive Testing靜水壓或無損檢測

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.

除非采購訂單中另有規定，否則每根管道都應進行無損電氣試驗或靜水壓試驗，所使用的試驗類型應由製造商選擇。

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).

靜水壓試驗應符合規範A 450/A 450M，但在計算靜水壓試驗壓力時，應將32000（220.6）替換為64000（441.2）。

Markings標記

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

規範A450/A 450M中規定的標記，標記應表明管子是無縫的還是焊接的。

Note:注：

• Mill test certificates will be issued according to EN10204.3.·
• 工廠測試證書將根據EN10204.3頒發。
• All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.·
• 所有管子應按照適用的ASTM A789/A789M規範供應。