良工阀门的工作温度是良工阀门设计和选材中必须考虑的问题之一。为规范良工阀门主体材料的适宜工作温度程度，从各类良工阀门用钢和合金的材料性能来看，用于我国石化、化工、化肥、电力、冶金等行业对良工阀门主体材料的适宜工作温度及相关要求作出明确规定，供良工阀门产品设计、制造和检验时使用。此外，从技术管理、生产管理、物资采购等方面考虑，各类钢材应选择综合性能好的，不要直接选择过多的钢材号码以防造成混乱。

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.

超低温阀[-254(液氢)~-101°C(乙烯)]主要材料必须选用良工体不锈钢、铜台面心立方晶格热处理后的低温力学性能，特别是低温冲击韧性，必须符合标准要求。以下良工体不锈钢可用于制造超低温良工阀门。ASTMA351CF8M、CF3M、CF8和CF3，ASTMA182F316、F316L、F304和F304L，ASTMA4316、316L、304、304L和CF8D(兰州高压良工阀门厂设计，厂家设计，标准代号GFQ81-93)。超低温阀[]的阀体、阀盖、闸板或阀瓣在精加工前必须为液氮(196)°C)中进行深冷处理。

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.

良工阀门适用于低温阀(-100~-300°C)主要材料为低温良工体不锈钢和低温承压件铁素体和马氏体钢。低温良工体不锈钢ASTMA351CF8M、CF3M、CF8和CF3，ASTMA182F316、F316L、F304和.F304L，ASTMA43316、316L、304、304L和CF8D.铁素体和马氏体钢具有ASTMA352LCA-32*C)、LCB、LCC(-46°C)、LC1(-59°C)、LC2、LC211(-73*C)和LC3(-100°C)。ASTMA352标准中的初级材料较低，但在冶炼过程中，化学成分必须可靠、严格标准。其热处理工艺复杂，需要多次调质，才能满足标准要求的低温冲击韧性要求，生产周期长。

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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