译文：
一般情况下，针型阀门材料 应根据其参数及材料的性能按本标准选用，并应符合有关产品标准的规定。也可选用性能不低于本标准规定的或供购双方合同商定的其他材料。 而特殊情况下针型阀门的技术要求如下： 1.灰铸铁制针型阀门 用于公称压力 pN≤1.0MPa，温度为–10~200℃的水、蒸气、空气、煤气及油类等介质的灰铸铁制阀门。 2.可锻铸铁制针型阀门 用于公称压力 pN≤2.5MPa，温度为–30~300℃的水、蒸气、空气及油类等介质的可锻铸铁制阀门。 3. 球墨铸铁制针型阀门 用于公称压力 pN≤4.0MPa，温度为–30~350℃的水、蒸气、空气及油类等介质的球墨铸铁制阀门。 4.铜合金制针型阀门 用于公称压力 pN≤2.5MPa 的水、海水、氧气、空气、油类等介质，以及温度为–40~250℃的蒸气介质的铜合金制阀门。 5.碳素钢制针型阀门 用于公称压力 pN≤32.0MPa，温度为–30~450℃的水、蒸气、空气、氢气、氨、氮及石油产品等介质的碳素钢制阀门。 6.高温钢制针型阀门 用于公称压力 pN≤16.0MPa，温度小于或等于 550℃的蒸气及石油产品等介质的高温钢制阀门。 7.低温钢制针型阀门 用于公称压力 pN≤6.4MPa，温度高于或等于–196℃的乙烯、丙烯、液态天然气及液氮等介质的低温钢制阀门。 8.不锈耐酸钢制针型阀门 用于公称压力 pN≤6.4MPa，温度低于或等于 200℃的硝酸、醋酸等介质的不锈耐酸钢制阀门。

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原文：
In general, needle valve material should be based on its parameters and material properties used by this standard, and should comply with the relevant product standards. Performance can also be used not less than the standard required for the purchase or contract the two sides agreed to other materials. The special circumstances needle valve technology requirements are as follows: 1. Gray cast iron, needle valve For the nominal pressure pN ≤ 1.0MPa, temperature of -10 ~ 200 ℃ water, steam, air, gas and oil, and other media of gray cast iron valve. 2. Malleable iron needle valve For the nominal pressure pN ≤ 2.5MPa, temperature of -30 ~ 300 ℃ water, steam, air and oil and other media malleable iron valves. 3. Ductile iron needle-type valve For the nominal pressure pN ≤ 4.0MPa, temperature of -30 ~ 350 ℃ water, steam, air and oil, and other media of ductile iron valve system. 4. Copper alloy needle valve PN pN ≤ 2.5MPa for water, water, oxygen and air, oil and other media, and the temperature is -40 ~ 250 ℃ steam medium copper alloy valves. 5. Carbon steel needle valve For the nominal pressure pN ≤ 32.0MPa, temperature -30 ~ 450 ℃ water, steam, air, hydrogen, ammonia, nitrogen and oil medium carbon steel products, valves. 6. Hot steel needle valve For the nominal pressure pN ≤ 16.0MPa, the temperature is less than or equal to 550 ℃ steam and high temperature medium such as petroleum products steel valves. 7. Cryogenic steel needle valve For the nominal pressure pN ≤ 6.4MPa, temperature is higher than or equal to -196 ℃ ethylene, propylene, liquefied natural gas and liquid nitrogen temperature steel valves and other media. 8. Stainless steel needle valve acid For the nominal pressure pN ≤ 6.4MPa, temperature is lower than or equal to 200 ℃ of nitric acid, acetic acid and other medium of stainless steel valves.