良工閥門的工作溫度是良工閥門設計和選材中必須考慮的問題之一。為規范良工閥門主體材料的適宜工作溫度程度，從各類良工閥門用鋼和合金品牌的材料性能來看，用于我國石化、化工、化肥、電力、冶金等行業對良工閥門主體材料的適宜工作溫度及相關要求作出明確規定，供良工閥門產品設計、制造和檢驗時使用。此外，從技術管理、生產管理、物資采購等方面考慮，各類鋼材應選擇綜合性能好的，不要直接選擇過多的鋼材號碼以防造成混亂。

The working temperature of Lianggong valves is one of the issues that must be considered in the design and material selection of Lianggong valves. In order to standardize the suitable working temperature level of the main material of Lianggong valves, from the perspective of the material properties of various steel and alloy brands used in Lianggong valves, clear regulations are made for the suitable working temperature and related requirements of Lianggong valve main materials used in industries such as petrochemical, chemical, fertilizer, power, and metallurgy in China, for use in the design, manufacturing, and inspection of Lianggong valve products. In addition, considering technical management, production management, material procurement, and other aspects, various types of steel should be selected with good comprehensive performance, and too many steel numbers should not be directly selected to prevent confusion.

超低溫閥[-254(液氫)~-101°C(乙烯)]主要材料必須選用良工體不銹鋼、銅臺面心立方晶格熱處理后的低溫力學性能，特別是低溫沖擊韌性，必須符合標準要求。以下良工體不銹鋼可用于制造超低溫良工閥門。ASTMA351CF8M、CF3M、CF8和CF3，ASTMA182F316、F316L、F304和F304L，ASTMA4316、316L、304、304L和CF8D(蘭州高壓良工閥門廠設計，廠家設計，標準代號GFQ81-93)。超低溫閥[]的閥體、閥蓋、閘板或閥瓣在精加工前必須為液氮(196)°C)中進行深冷處理。

The main material for ultra-low temperature valves [-254 (liquid hydrogen)~-101 ° C (ethylene)] must be made of high-quality stainless steel and copper, and the low-temperature mechanical properties, especially the low-temperature impact toughness, must meet the standard requirements after heat treatment with a cubic lattice. The following high-quality stainless steel can be used to manufacture ultra-low temperature high-quality valves. ASTMA351CF8M, CF3M, CF8 and CF3, ASTMA182F316, F316L, F304 and F304L, ASTMA4316, 316L, 304, 304L and CF8D (designed by Lanzhou High Pressure Lianggong Valve Factory, manufacturer, standard code GFQ81-93). The valve body, cover, gate or disc of ultra-low temperature valves must be subjected to cryogenic treatment in liquid nitrogen (196 ° C) before precision machining.

良工閥門適用于低溫閥(-100~-300°C)主要材料為低溫良工體不銹鋼和低溫承壓件鐵素體和馬氏體鋼。低溫良工體不銹鋼ASTMA351CF8M、CF3M、CF8和CF3，ASTMA182F316、F316L、F304和.F304L，ASTMA43316、316L、304、304L和CF8D.鐵素體和馬氏體鋼具有ASTMA352LCA-32*C)、LCB、LCC(-46°C)、LC1(-59°C)、LC2、LC211(-73*C)和LC3(-100°C)。ASTMA352標準中的初級材料價格較低，但在冶煉過程中，化學成分必須可靠、嚴格標準。其熱處理工藝復雜，需要多次調質，才能滿足標準要求的低溫沖擊韌性要求，生產周期長。

Lianggong valves are suitable for low-temperature valves (-100~-300 ° C). The main materials used are low-temperature Lianggong stainless steel and low-temperature pressure parts such as ferrite and martensitic steel. Low temperature and good working stainless steel ASTMA351CF8M, CF3M, CF8 and CF3, ASTMA182F316, F316L, F304 and F304L, ASTMA43316, 316L, 304, 304L, and CF8D. Ferritic and martensitic steels have ASTMA352LCA-32 * C, LCB, LCC (-46 ° C), LC1 (-59 ° C), LC2, LC211 (-73 * C), and LC3 (-100 ° C). The price of primary materials in the ASTMA352 standard is relatively low, but during the smelting process, the chemical composition must be reliable and strictly standardized. Its heat treatment process is complex and requires multiple quenching and tempering to meet the low-temperature impact toughness requirements of the standard, with a long production cycle.

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